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O_DIRECT with EINVAL error #57047

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hillar opened this issue Feb 14, 2025 · 6 comments
Open

O_DIRECT with EINVAL error #57047

hillar opened this issue Feb 14, 2025 · 6 comments

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@hillar
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hillar commented Feb 14, 2025

Version

v23.8.0, v22.14.0, v20.18.2

Platform

Linux be0d621d6699 6.11.10-200.fc40.x86_64 #1 SMP PREEMPT_DYNAMIC Sat Nov 23 00:53:13 UTC 2024 x86_64 GNU/Linux

Subsystem

fs

What steps will reproduce the bug?

Using file reading or writing with the constants.O_DIRECT flag in results in an EINVAL: invalid argument, read error when attempting to read a file.
Tested on xfs and overlayfs filesystems on Linux.
The same code works on tmpfs and on macos, obviously ;)

Interestingly, a similar implementation in Go using syscall.Open(..., syscall.O_DIRECT | syscall.O_SYNC, ...) and syscall.Read does work without errors on the same xfs and overlayfs filesystems.

How often does it reproduce? Is there a required condition?

createReadStream, createWriteStream, read after open

What is the expected behavior? Why is that the expected behavior?

file I/O to bypass the Linux kernel's caches

What do you see instead?

Uncaught Error: EINVAL: invalid argument, read

Additional information

No response
@santigimeno
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Can you post a simple code that reproduces the issue and run the program with strace -f -o output.txt node program.js and post the file somewhere? Thanks

@hillar
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hillar commented Feb 14, 2025 

const fs = require('fs');
const readStream = fs.createReadStream('example.txt', { encoding: 'utf8', flags:fs.constants.O_DIRECT });
readStream.on('data', (chunk) => {
  console.log(chunk);
});
readStream.on('error', (err) => {
  console.error('Error reading file:', err);
});
readStream.on('end', () => {
  console.log('Finished reading file.');
});

952127 futex(0x6ba5890, FUTEX_WAKE_PRIVATE, 2147483647 <unfinished ...>
952137 futex(0x6ba5888, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY <unfinished ...>
952127 <... futex resumed>)             = 0
952127 futex(0x6ba5888, FUTEX_WAKE_PRIVATE, 1) = 1
952134 <... futex resumed>)             = 0
952134 futex(0x6ba5820, FUTEX_WAKE_PRIVATE, 1) = 0
952134 openat(AT_FDCWD, "example.txt", O_RDONLY|O_DIRECT|O_CLOEXEC) = 20
952134 write(19, "\1\0\0\0\0\0\0\0", 8) = 8
952134 futex(0x6ba588c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY <unfinished ...>
952127 io_uring_enter(16, 2, 2, IORING_ENTER_GETEVENTS, NULL, 0) = 2
952127 epoll_pwait(15, [{events=EPOLLIN, data=0x13}], 1024, 0, NULL, 8) = 1
952127 read(19, "\1\0\0\0\0\0\0\0", 1024) = 8
952127 futex(0x6ba5888, FUTEX_WAKE_PRIVATE, 1) = 1
952135 <... futex resumed>)             = 0
952135 futex(0x6ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952127 epoll_pwait(15,  <unfinished ...>
952135 <... futex resumed>)             = 0
952127 <... epoll_pwait resumed>[], 1024, 0, NULL, 8) = 0
952135 read(20,  <unfinished ...>
952127 epoll_pwait(15,  <unfinished ...>
952135 <... read resumed>0x25c718f0, 65536) = -1 EINVAL (Invalid argument)
952135 write(19, "\1\0\0\0\0\0\0\0", 8 <unfinished ...>
952127 <... epoll_pwait resumed>[{events=EPOLLIN, data=0x13}], 1024, -1, NULL, 8) = 1
952135 <... write resumed>)             = 8
952127 read(19,  <unfinished ...>
952135 futex(0x6ba588c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY <unfinished ...>
952127 <... read resumed>"\1\0\0\0\0\0\0\0", 1024) = 8
952127 futex(0x6ba5888, FUTEX_WAKE_PRIVATE, 1) = 1
952136 <... futex resumed>)             = 0
952127 epoll_pwait(15,  <unfinished ...>
952136 futex(0x6ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952127 <... epoll_pwait resumed>[], 1024, 0, NULL, 8) = 0
952136 <... futex resumed>)             = 0
952127 epoll_pwait(15,  <unfinished ...>
952136 close(20)                        = 0
952136 write(19, "\1\0\0\0\0\0\0\0", 8 <unfinished ...>
952127 <... epoll_pwait resumed>[{events=EPOLLIN, data=0x13}], 1024, -1, NULL, 8) = 1
952136 <... write resumed>)             = 8
952127 read(19,  <unfinished ...>
952136 futex(0x6ba588c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY <unfinished ...>
952127 <... read resumed>"\1\0\0\0\0\0\0\0", 1024) = 8
952127 ioctl(2, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952127 ioctl(2, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952127 fcntl(2, F_GETFL)                = 0x402 (flags O_RDWR|O_APPEND)
952127 ioctl(2, TIOCGPTN, 0x7ffc9bebc380) = -1 ENOTTY (Inappropriate ioctl for device)
952127 ioctl(2, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952127 fstat(2, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1), ...}) = 0
952127 readlink("/proc/self/fd/2", "/dev/pts/1", 255) = 10
952127 newfstatat(AT_FDCWD, "/dev/pts/1", {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1), ...}, 0) = 0
952127 openat(AT_FDCWD, "/dev/pts/1", O_RDWR|O_NOCTTY|O_CLOEXEC) = 20
952127 dup3(20, 2, O_CLOEXEC)           = 2
952127 openat(AT_FDCWD, "/dev/null", O_RDONLY|O_CLOEXEC) = 21
952127 ioctl(20, FIONBIO, [1])          = 0
952127 ioctl(20, FIONBIO, [0])          = 0
952127 ioctl(20, TIOCGWINSZ, {ws_row=47, ws_col=212, ws_xpixel=1484, ws_ypixel=658}) = 0
952127 rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
952127 read(5, "*", 1)                  = 1
952127 rt_sigaction(SIGWINCH, {sa_handler=0x2087a00, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f9596a4efd0}, NULL, 8) = 0
952127 write(6, "*", 1)                 = 1
952127 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
952127 write(20, "Error reading file: [Error: EINV"..., 144) = 144
952127 epoll_ctl(15, EPOLL_CTL_DEL, 20, 0x7ffc9bec39e4) = -1 ENOENT (No such file or directory)
952127 close(20)                        = 0
952127 rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
952127 read(5, "*", 1)                  = 1
952127 rt_sigaction(SIGWINCH, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7f9596a4efd0}, NULL, 8) = 0
952127 write(6, "*", 1)                 = 1
952127 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
952127 epoll_pwait(15, [], 1024, 0, NULL, 8) = 0
952127 epoll_pwait(15, [], 1024, 0, NULL, 8) = 0
952127 munmap(0x28390a6c0000, 262144)   = 0
952127 munmap(0x3bbb2ec0000, 262144)    = 0
952127 munmap(0x60b080c0000, 262144)    = 0
952127 munmap(0x287e1bb00000, 258048)   = 0
952127 munmap(0x204702840000, 262144)   = 0
952127 munmap(0x382cc3c80000, 262144)   = 0
952127 munmap(0x2f2326440000, 262144)   = 0
952127 munmap(0x14ea7ba00000, 262144)   = 0
952127 munmap(0x1efd58d40000, 262144)   = 0
952127 munmap(0x1cbafcc00000, 262144)   = 0
952127 munmap(0x33620d40000, 262144)    = 0
952127 madvise(0x7f9570000000, 262144, MADV_DONTNEED) = 0
952127 munmap(0x9a90f140000, 262144)    = 0
952127 munmap(0x9c3c0d00000, 262144)    = 0
952127 munmap(0x89a471c0000, 258048)    = 0
952127 munmap(0x38e8b4a80000, 262144)   = 0
952127 munmap(0x16ed5b8c0000, 266240)   = 0
952127 munmap(0x17047adc0000, 262144)   = 0
952127 munmap(0x3b696dc0000, 262144)    = 0
952127 munmap(0x263f2c480000, 262144)   = 0
952127 munmap(0x1f49d2ac0000, 262144)   = 0
952127 munmap(0x7f9594168000, 135168)   = 0
952127 munmap(0xf8e78300000, 118784)    = 0
952127 munmap(0x7f9570000000, 536870912) = 0
952127 fstat(0, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1), ...}) = 0
952127 fcntl(0, F_GETFL)                = 0x402 (flags O_RDWR|O_APPEND)
952127 rt_sigprocmask(SIG_BLOCK, [TTOU], NULL, 8) = 0
952127 ioctl(0, TCSETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952127 ioctl(0, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952127 rt_sigprocmask(SIG_UNBLOCK, [TTOU], NULL, 8) = 0
952127 fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1), ...}) = 0
952127 fcntl(1, F_GETFL)                = 0x402 (flags O_RDWR|O_APPEND)
952127 rt_sigprocmask(SIG_BLOCK, [TTOU], NULL, 8) = 0
952127 ioctl(1, TCSETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952127 ioctl(1, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952127 rt_sigprocmask(SIG_UNBLOCK, [TTOU], NULL, 8) = 0
952127 fstat(2, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1), ...}) = 0
952127 fcntl(2, F_GETFL)                = 0x8002 (flags O_RDWR|O_LARGEFILE)
952127 rt_sigprocmask(SIG_BLOCK, [TTOU], NULL, 8) = 0
952127 ioctl(2, TCSETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952127 ioctl(2, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952127 rt_sigprocmask(SIG_UNBLOCK, [TTOU], NULL, 8) = 0
952127 rt_sigaction(SIGHUP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGINT, NULL, {sa_handler=0xfe0310, sa_mask=~[KILL STOP RTMIN RT_1], sa_flags=SA_RESTORER|SA_RESETHAND, sa_restorer=0x7f9596a4efd0}, 8) = 0
952127 rt_sigaction(SIGQUIT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGILL, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGTRAP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGABRT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGBUS, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGFPE, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGUSR1, NULL, {sa_handler=0x11f0e30, sa_mask=~[KILL STOP RTMIN RT_1], sa_flags=SA_RESTORER, sa_restorer=0x7f9596a4efd0}, 8) = 0
952127 rt_sigaction(SIGSEGV, NULL, {sa_handler=0xfe0480, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f9596a4efd0}, 8) = 0
952127 rt_sigaction(SIGUSR2, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7f9596a4efd0}, NULL, 8) = 0
952127 rt_sigaction(SIGALRM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGTERM, NULL, {sa_handler=0xfe0310, sa_mask=~[KILL STOP RTMIN RT_1], sa_flags=SA_RESTORER|SA_RESETHAND, sa_restorer=0x7f9596a4efd0}, 8) = 0
952127 rt_sigaction(SIGSTKFLT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGCHLD, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGCONT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGTSTP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGTTIN, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGTTOU, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGURG, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGXCPU, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGXFSZ, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7f9596a4efd0}, NULL, 8) = 0
952127 rt_sigaction(SIGVTALRM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGPROF, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGWINCH, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7f9596a4efd0}, 8) = 0
952127 rt_sigaction(SIGIO, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGPWR, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 rt_sigaction(SIGSYS, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952127 futex(0x25ba5870, FUTEX_WAKE_PRIVATE, 2147483647) = 4
952130 <... futex resumed>)             = 0
952131 <... futex resumed>)             = 0
952127 write(14, "\1\0\0\0\0\0\0\0", 8 <unfinished ...>
952132 <... futex resumed>)             = 0
952131 futex(0x25ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952129 <... futex resumed>)             = 0
952127 <... write resumed>)             = 8
952132 futex(0x25ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952131 <... futex resumed>)             = 0
952129 futex(0x25ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952128 <... epoll_pwait resumed>[{events=EPOLLIN, data=0xe}], 1024, -1, NULL, 8) = 1
952127 futex(0x7f9596a0d990, FUTEX_WAIT_BITSET|FUTEX_CLOCK_REALTIME, 952128, NULL, FUTEX_BITSET_MATCH_ANY <unfinished ...>
952132 <... futex resumed>)             = 0
952131 mmap(NULL, 134217728, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 <unfinished ...>
952129 <... futex resumed>)             = 0
952132 mmap(NULL, 134217728, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 <unfinished ...>
952128 read(14,  <unfinished ...>
952131 <... mmap resumed>)              = 0x7f9588000000
952129 mmap(NULL, 134217728, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 <unfinished ...>
952132 <... mmap resumed>)              = 0x7f9580000000
952131 munmap(0x7f958c000000, 67108864 <unfinished ...>
952128 <... read resumed>"\1\0\0\0\0\0\0\0", 1024) = 8
952132 munmap(0x7f9584000000, 67108864 <unfinished ...>
952129 <... mmap resumed>)              = 0x7f9578000000
952131 <... munmap resumed>)            = 0
952128 close(12 <unfinished ...>
952132 <... munmap resumed>)            = 0
952131 mprotect(0x7f9588000000, 135168, PROT_READ|PROT_WRITE <unfinished ...>
952129 munmap(0x7f957c000000, 67108864 <unfinished ...>
952132 mprotect(0x7f9580000000, 135168, PROT_READ|PROT_WRITE <unfinished ...>
952128 <... close resumed>)             = 0
952131 <... mprotect resumed>)          = 0
952132 <... mprotect resumed>)          = 0
952129 <... munmap resumed>)            = 0
952128 close(13 <unfinished ...>
952131 rt_sigprocmask(SIG_BLOCK, ~[RT_1],  <unfinished ...>
952129 mprotect(0x7f9578000000, 135168, PROT_READ|PROT_WRITE <unfinished ...>
952132 rt_sigprocmask(SIG_BLOCK, ~[RT_1],  <unfinished ...>
952131 <... rt_sigprocmask resumed>NULL, 8) = 0
952128 <... close resumed>)             = 0
952132 <... rt_sigprocmask resumed>NULL, 8) = 0
952131 madvise(0x7f9594a0a000, 8368128, MADV_DONTNEED <unfinished ...>
952129 <... mprotect resumed>)          = 0
952132 madvise(0x7f9594209000, 8368128, MADV_DONTNEED <unfinished ...>
952128 munmap(0x7f9596f9b000, 8256 <unfinished ...>
952131 <... madvise resumed>)           = 0
952129 rt_sigprocmask(SIG_BLOCK, ~[RT_1],  <unfinished ...>
952132 <... madvise resumed>)           = 0
952131 exit(0 <unfinished ...>
952128 <... munmap resumed>)            = 0
952132 exit(0 <unfinished ...>
952131 <... exit resumed>)              = ?
952129 <... rt_sigprocmask resumed>NULL, 8) = 0
952132 <... exit resumed>)              = ?
952128 munmap(0x7f9596e6e000, 16384 <unfinished ...>
952131 +++ exited with 0 +++
952129 madvise(0x7f9595a0c000, 8368128, MADV_DONTNEED <unfinished ...>
952132 +++ exited with 0 +++
952128 <... munmap resumed>)            = 0
952130 futex(0x25ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952129 <... madvise resumed>)           = 0
952128 close(11 <unfinished ...>
952130 <... futex resumed>)             = 0
952129 exit(0 <unfinished ...>
952130 rt_sigprocmask(SIG_BLOCK, ~[RT_1],  <unfinished ...>
952129 <... exit resumed>)              = ?
952128 <... close resumed>)             = 0
952130 <... rt_sigprocmask resumed>NULL, 8) = 0
952129 +++ exited with 0 +++
952128 close(14 <unfinished ...>
952130 madvise(0x7f959520b000, 8368128, MADV_DONTNEED <unfinished ...>
952128 <... close resumed>)             = 0
952130 <... madvise resumed>)           = 0
952128 close(10 <unfinished ...>
952130 exit(0)                          = ?
952128 <... close resumed>)             = 0
952130 +++ exited with 0 +++
952128 rt_sigprocmask(SIG_BLOCK, ~[RT_1], NULL, 8) = 0
952128 madvise(0x7f959620d000, 8368128, MADV_DONTNEED) = 0
952128 exit(0)                          = ?
952127 <... futex resumed>)             = 0
952128 +++ exited with 0 +++
952127 munmap(0x7f959620d000, 8392704)  = 0
952127 io_uring_enter(4, 2, 2, IORING_ENTER_GETEVENTS, NULL, 0) = 2
952127 epoll_pwait(3, [], 1024, 0, NULL, 8) = 0
952127 close(7)                         = 0
952127 close(8)                         = 0
952127 munmap(0x7f9596f9e000, 8256)     = 0
952127 munmap(0x7f9596e72000, 16384)    = 0
952127 close(4)                         = 0
952127 close(9)                         = 0
952127 close(3)                         = 0
952127 futex(0x6ba5de8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
952127 fstat(0, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1), ...}) = 0
952127 fcntl(0, F_GETFL)                = 0x402 (flags O_RDWR|O_APPEND)
952127 rt_sigprocmask(SIG_BLOCK, [TTOU], NULL, 8) = 0
952127 ioctl(0, TCSETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952127 ioctl(0, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952127 rt_sigprocmask(SIG_UNBLOCK, [TTOU], NULL, 8) = 0
952127 fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1), ...}) = 0
952127 fcntl(1, F_GETFL)                = 0x402 (flags O_RDWR|O_APPEND)
952127 rt_sigprocmask(SIG_BLOCK, [TTOU], NULL, 8) = 0
952127 ioctl(1, TCSETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952127 ioctl(1, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952127 rt_sigprocmask(SIG_UNBLOCK, [TTOU], NULL, 8) = 0
952127 fstat(2, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1), ...}) = 0
952127 fcntl(2, F_GETFL)                = 0x8002 (flags O_RDWR|O_LARGEFILE)
952127 rt_sigprocmask(SIG_BLOCK, [TTOU], NULL, 8) = 0
952127 ioctl(2, TCSETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952127 ioctl(2, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952127 rt_sigprocmask(SIG_UNBLOCK, [TTOU], NULL, 8) = 0
952127 close(5)                         = 0
952127 close(6)                         = 0
952127 futex(0x6ba5888, FUTEX_WAKE_PRIVATE, 1) = 1
952137 <... futex resumed>)             = 0
952127 futex(0x7f956ffff990, FUTEX_WAIT_BITSET|FUTEX_CLOCK_REALTIME, 952134, NULL, FUTEX_BITSET_MATCH_ANY <unfinished ...>
952137 futex(0x6ba588c, FUTEX_WAKE_PRIVATE, 1) = 1
952134 <... futex resumed>)             = 0
952137 futex(0x6ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952134 futex(0x6ba588c, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952137 <... futex resumed>)             = 0
952134 <... futex resumed>)             = 1
952137 rt_sigprocmask(SIG_BLOCK, ~[RT_1],  <unfinished ...>
952135 <... futex resumed>)             = 0
952137 <... rt_sigprocmask resumed>NULL, 8) = 0
952134 futex(0x6ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952135 futex(0x6ba588c, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952137 madvise(0x7f956dffc000, 8368128, MADV_DONTNEED <unfinished ...>
952134 <... futex resumed>)             = 0
952135 <... futex resumed>)             = 1
952137 <... madvise resumed>)           = 0
952136 <... futex resumed>)             = 0
952134 rt_sigprocmask(SIG_BLOCK, ~[RT_1],  <unfinished ...>
952137 exit(0 <unfinished ...>
952136 futex(0x6ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952135 futex(0x6ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952137 <... exit resumed>)              = ?
952136 <... futex resumed>)             = 0
952134 <... rt_sigprocmask resumed>NULL, 8) = 0
952137 +++ exited with 0 +++
952136 rt_sigprocmask(SIG_BLOCK, ~[RT_1],  <unfinished ...>
952135 <... futex resumed>)             = 0
952134 madvise(0x7f956f7ff000, 8368128, MADV_DONTNEED <unfinished ...>
952136 <... rt_sigprocmask resumed>NULL, 8) = 0
952135 rt_sigprocmask(SIG_BLOCK, ~[RT_1],  <unfinished ...>
952136 madvise(0x7f956e7fd000, 8368128, MADV_DONTNEED <unfinished ...>
952134 <... madvise resumed>)           = 0
952135 <... rt_sigprocmask resumed>NULL, 8) = 0
952136 <... madvise resumed>)           = 0
952134 exit(0 <unfinished ...>
952135 madvise(0x7f956effe000, 8368128, MADV_DONTNEED <unfinished ...>
952136 exit(0 <unfinished ...>
952134 <... exit resumed>)              = ?
952136 <... exit resumed>)              = ?
952135 <... madvise resumed>)           = 0
952127 <... futex resumed>)             = 0
952136 +++ exited with 0 +++
952134 +++ exited with 0 +++
952135 exit(0 <unfinished ...>
952127 munmap(0x7f9595a0c000, 8392704 <unfinished ...>
952135 <... exit resumed>)              = ?
952127 <... munmap resumed>)            = 0
952135 +++ exited with 0 +++
952127 munmap(0x7f959520b000, 8392704)  = 0
952127 munmap(0x7f9594a0a000, 8392704)  = 0
952127 munmap(0x7f9594209000, 8392704)  = 0
952127 exit_group(0)                    = ?
952133 <... futex resumed>)             = ?
952133 +++ exited with 0 +++

@hillar
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hillar commented Feb 14, 2025 

const fs = require('fs');
const CHUNK_SIZE = 512; 
const buffer = Buffer.alloc(CHUNK_SIZE);
fs.open('example.txt', fs.constants.O_DIRECT, (err, fd) => {
  if (err) {
    console.error('Error opening file:', err);
    return;
  }
  function readNext() {
    fs.read(fd, buffer, 0, CHUNK_SIZE, null, (err, bytesRead) => {
      if (err) {
        console.error('Error reading file:', err);
        fs.close(fd, (err) => {
          if (err) console.error('Error closing file:', err);
        });
        return;
      }
      if (bytesRead > 0) {
        console.log(buffer.toString('utf8', 0, bytesRead));
        readNext();
      } else {
        fs.close(fd, (err) => {
          if (err) console.error('Error closing file:', err);
          else console.log('Finished reading file.');
        });
      }
    });
  }
 readNext();
});


952233 <... futex resumed>)             = 0
952233 futex(0x6ba5888, FUTEX_WAKE_PRIVATE, 1) = 1
952240 <... futex resumed>)             = 0
952240 futex(0x6ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952233 io_uring_enter(16, 2, 2, IORING_ENTER_GETEVENTS, NULL, 0 <unfinished ...>
952240 <... futex resumed>)             = 0
952233 <... io_uring_enter resumed>)    = 2
952240 openat(AT_FDCWD, "example.txt", O_RDONLY|O_DIRECT|O_CLOEXEC <unfinished ...>
952233 epoll_pwait(15, [], 1024, 0, NULL, 8) = 0
952240 <... openat resumed>)            = 20
952233 epoll_pwait(15,  <unfinished ...>
952240 write(19, "\1\0\0\0\0\0\0\0", 8 <unfinished ...>
952233 <... epoll_pwait resumed>[{events=EPOLLIN, data=0x13}], 1024, -1, NULL, 8) = 1
952240 <... write resumed>)             = 8
952233 read(19,  <unfinished ...>
952240 futex(0x6ba588c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY <unfinished ...>
952233 <... read resumed>"\1\0\0\0\0\0\0\0", 1024) = 8
952233 futex(0x6ba5888, FUTEX_WAKE_PRIVATE, 1) = 1
952241 <... futex resumed>)             = 0
952233 futex(0x6ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952241 futex(0x6ba5820, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
952233 <... futex resumed>)             = 0
952241 <... futex resumed>)             = -1 EAGAIN (Resource temporarily unavailable)
952233 epoll_pwait(15,  <unfinished ...>
952241 futex(0x6ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952233 <... epoll_pwait resumed>[], 1024, 0, NULL, 8) = 0
952241 <... futex resumed>)             = 0
952233 epoll_pwait(15,  <unfinished ...>
952241 read(20, 0x1e0fa730, 512)        = -1 EINVAL (Invalid argument)
952241 write(19, "\1\0\0\0\0\0\0\0", 8) = 8
952233 <... epoll_pwait resumed>[{events=EPOLLIN, data=0x13}], 1024, -1, NULL, 8) = 1
952241 futex(0x6ba588c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY <unfinished ...>
952233 read(19, "\1\0\0\0\0\0\0\0", 1024) = 8
952233 ioctl(2, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952233 mmap(0x443a2140000, 520192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x443a2140000
952233 madvise(0x443a2140000, 520192, MADV_DONTFORK) = 0
952233 munmap(0x443a2180000, 258048)    = 0
952233 ioctl(2, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952233 fcntl(2, F_GETFL)                = 0x402 (flags O_RDWR|O_APPEND)
952233 ioctl(2, TIOCGPTN, 0x7ffc7ee66110) = -1 ENOTTY (Inappropriate ioctl for device)
952233 ioctl(2, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952233 fstat(2, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1), ...}) = 0
952233 readlink("/proc/self/fd/2", "/dev/pts/1", 255) = 10
952233 newfstatat(AT_FDCWD, "/dev/pts/1", {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1), ...}, 0) = 0
952233 openat(AT_FDCWD, "/dev/pts/1", O_RDWR|O_NOCTTY|O_CLOEXEC) = 21
952233 dup3(21, 2, O_CLOEXEC)           = 2
952233 openat(AT_FDCWD, "/dev/null", O_RDONLY|O_CLOEXEC) = 22
952233 ioctl(21, FIONBIO, [1])          = 0
952233 ioctl(21, FIONBIO, [0])          = 0
952233 ioctl(21, TIOCGWINSZ, {ws_row=47, ws_col=212, ws_xpixel=1484, ws_ypixel=658}) = 0
952233 rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
952233 read(5, "*", 1)                  = 1
952233 rt_sigaction(SIGWINCH, {sa_handler=0x2087a00, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f036e04efd0}, NULL, 8) = 0
952233 write(6, "*", 1)                 = 1
952233 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
952233 write(21, "Error reading file: [Error: EINV"..., 144) = 144
952233 futex(0x6ba5888, FUTEX_WAKE_PRIVATE, 1) = 1
952233 epoll_pwait(15, [], 1024, 0, NULL, 8) = 0
952233 epoll_pwait(15,  <unfinished ...>
952242 <... futex resumed>)             = 0
952242 futex(0x6ba5820, FUTEX_WAKE_PRIVATE, 1) = 0
952242 close(20)                        = 0
952242 write(19, "\1\0\0\0\0\0\0\0", 8 <unfinished ...>
952233 <... epoll_pwait resumed>[{events=EPOLLIN, data=0x13}], 1024, -1, NULL, 8) = 1
952242 <... write resumed>)             = 8
952233 read(19, "\1\0\0\0\0\0\0\0", 1024) = 8
952242 futex(0x6ba588c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY <unfinished ...>
952233 epoll_ctl(15, EPOLL_CTL_DEL, 21, 0x7ffc7ee6d544) = -1 ENOENT (No such file or directory)
952233 close(21)                        = 0
952233 rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
952233 read(5, "*", 1)                  = 1
952233 rt_sigaction(SIGWINCH, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7f036e04efd0}, NULL, 8) = 0
952233 write(6, "*", 1)                 = 1
952233 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
952233 epoll_pwait(15, [], 1024, 0, NULL, 8) = 0
952233 epoll_pwait(15, [], 1024, 0, NULL, 8) = 0
952233 munmap(0x2b9d29100000, 262144)   = 0
952233 munmap(0x17640dd80000, 262144)   = 0
952233 munmap(0x3047b9780000, 262144)   = 0
952233 munmap(0x398d30880000, 258048)   = 0
952233 munmap(0x21a5ca280000, 262144)   = 0
952233 munmap(0x33787c0000, 262144)     = 0
952233 munmap(0x2f8141680000, 262144)   = 0
952233 munmap(0x203c39900000, 262144)   = 0
952233 munmap(0x3a1dac0000, 262144)     = 0
952233 munmap(0x37c5769c0000, 262144)   = 0
952233 munmap(0x443a2140000, 262144)    = 0
952233 madvise(0x7f0347740000, 262144, MADV_DONTNEED) = 0
952233 munmap(0x1febc4d80000, 262144)   = 0
952233 munmap(0x2ba6a8440000, 262144)   = 0
952233 munmap(0x38dd53f80000, 258048)   = 0
952233 munmap(0x3f79bd00000, 262144)    = 0
952233 munmap(0x26ac91840000, 266240)   = 0
952233 munmap(0x18ae49600000, 262144)   = 0
952233 munmap(0x37a35440000, 262144)    = 0
952233 munmap(0x3bd913440000, 262144)   = 0
952233 munmap(0x2e8395040000, 262144)   = 0
952233 munmap(0x7f036775a000, 135168)   = 0
952233 munmap(0x2d0422fc0000, 118784)   = 0
952233 munmap(0x7f0347740000, 536870912) = 0
952233 fstat(0, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1), ...}) = 0
952233 fcntl(0, F_GETFL)                = 0x402 (flags O_RDWR|O_APPEND)
952233 rt_sigprocmask(SIG_BLOCK, [TTOU], NULL, 8) = 0
952233 ioctl(0, TCSETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952233 ioctl(0, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952233 rt_sigprocmask(SIG_UNBLOCK, [TTOU], NULL, 8) = 0
952233 fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1), ...}) = 0
952233 fcntl(1, F_GETFL)                = 0x402 (flags O_RDWR|O_APPEND)
952233 rt_sigprocmask(SIG_BLOCK, [TTOU], NULL, 8) = 0
952233 ioctl(1, TCSETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952233 ioctl(1, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952233 rt_sigprocmask(SIG_UNBLOCK, [TTOU], NULL, 8) = 0
952233 fstat(2, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1), ...}) = 0
952233 fcntl(2, F_GETFL)                = 0x8002 (flags O_RDWR|O_LARGEFILE)
952233 rt_sigprocmask(SIG_BLOCK, [TTOU], NULL, 8) = 0
952233 ioctl(2, TCSETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952233 ioctl(2, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952233 rt_sigprocmask(SIG_UNBLOCK, [TTOU], NULL, 8) = 0
952233 rt_sigaction(SIGHUP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGINT, NULL, {sa_handler=0xfe0310, sa_mask=~[KILL STOP RTMIN RT_1], sa_flags=SA_RESTORER|SA_RESETHAND, sa_restorer=0x7f036e04efd0}, 8) = 0
952233 rt_sigaction(SIGQUIT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGILL, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGTRAP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGABRT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGBUS, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGFPE, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGUSR1, NULL, {sa_handler=0x11f0e30, sa_mask=~[KILL STOP RTMIN RT_1], sa_flags=SA_RESTORER, sa_restorer=0x7f036e04efd0}, 8) = 0
952233 rt_sigaction(SIGSEGV, NULL, {sa_handler=0xfe0480, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f036e04efd0}, 8) = 0
952233 rt_sigaction(SIGUSR2, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7f036e04efd0}, NULL, 8) = 0
952233 rt_sigaction(SIGALRM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGTERM, NULL, {sa_handler=0xfe0310, sa_mask=~[KILL STOP RTMIN RT_1], sa_flags=SA_RESTORER|SA_RESETHAND, sa_restorer=0x7f036e04efd0}, 8) = 0
952233 rt_sigaction(SIGSTKFLT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGCHLD, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGCONT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGTSTP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGTTIN, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGTTOU, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGURG, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGXCPU, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGXFSZ, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7f036e04efd0}, NULL, 8) = 0
952233 rt_sigaction(SIGVTALRM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGPROF, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGWINCH, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7f036e04efd0}, 8) = 0
952233 rt_sigaction(SIGIO, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGPWR, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 rt_sigaction(SIGSYS, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
952233 futex(0x1e015870, FUTEX_WAKE_PRIVATE, 2147483647) = 4
952238 <... futex resumed>)             = 0
952235 <... futex resumed>)             = 0
952233 write(14, "\1\0\0\0\0\0\0\0", 8 <unfinished ...>
952238 futex(0x1e015820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952233 <... write resumed>)             = 8
952236 <... futex resumed>)             = 0
952235 futex(0x1e015820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952233 futex(0x7f036e00d990, FUTEX_WAIT_BITSET|FUTEX_CLOCK_REALTIME, 952234, NULL, FUTEX_BITSET_MATCH_ANY <unfinished ...>
952238 <... futex resumed>)             = 0
952237 <... futex resumed>)             = 0
952234 <... epoll_pwait resumed>[{events=EPOLLIN, data=0xe}], 1024, -1, NULL, 8) = 1
952238 mmap(NULL, 134217728, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 <unfinished ...>
952237 futex(0x1e015820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952236 futex(0x1e015820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952235 <... futex resumed>)             = 0
952238 <... mmap resumed>)              = 0x7f035f600000
952236 <... futex resumed>)             = 0
952237 <... futex resumed>)             = 0
952234 read(14,  <unfinished ...>
952238 munmap(0x7f035f600000, 10485760 <unfinished ...>
952236 mmap(NULL, 134217728, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 <unfinished ...>
952235 mmap(NULL, 134217728, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 <unfinished ...>
952237 mmap(NULL, 134217728, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 <unfinished ...>
952234 <... read resumed>"\1\0\0\0\0\0\0\0", 1024) = 8
952238 <... munmap resumed>)            = 0
952236 <... mmap resumed>)              = 0x7f0358000000
952235 <... mmap resumed>)              = 0x7f0350000000
952237 <... mmap resumed>)              = 0x7f0348000000
952236 munmap(0x7f035c000000, 67108864 <unfinished ...>
952234 close(12 <unfinished ...>
952238 munmap(0x7f0364000000, 56623104 <unfinished ...>
952237 munmap(0x7f034c000000, 67108864 <unfinished ...>
952235 munmap(0x7f0354000000, 67108864 <unfinished ...>
952238 <... munmap resumed>)            = 0
952236 <... munmap resumed>)            = 0
952234 <... close resumed>)             = 0
952238 mprotect(0x7f0360000000, 135168, PROT_READ|PROT_WRITE <unfinished ...>
952236 mprotect(0x7f0358000000, 135168, PROT_READ|PROT_WRITE <unfinished ...>
952235 <... munmap resumed>)            = 0
952238 <... mprotect resumed>)          = 0
952237 <... munmap resumed>)            = 0
952234 close(13 <unfinished ...>
952236 <... mprotect resumed>)          = 0
952235 mprotect(0x7f0350000000, 135168, PROT_READ|PROT_WRITE <unfinished ...>
952238 rt_sigprocmask(SIG_BLOCK, ~[RT_1],  <unfinished ...>
952237 mprotect(0x7f0348000000, 135168, PROT_READ|PROT_WRITE <unfinished ...>
952234 <... close resumed>)             = 0
952238 <... rt_sigprocmask resumed>NULL, 8) = 0
952236 rt_sigprocmask(SIG_BLOCK, ~[RT_1],  <unfinished ...>
952235 <... mprotect resumed>)          = 0
952238 madvise(0x7f03677ff000, 8368128, MADV_DONTNEED <unfinished ...>
952237 <... mprotect resumed>)          = 0
952236 <... rt_sigprocmask resumed>NULL, 8) = 0
952234 munmap(0x7f036e58d000, 8256 <unfinished ...>
952238 <... madvise resumed>)           = 0
952236 madvise(0x7f036c807000, 8368128, MADV_DONTNEED <unfinished ...>
952235 rt_sigprocmask(SIG_BLOCK, ~[RT_1],  <unfinished ...>
952238 exit(0 <unfinished ...>
952237 rt_sigprocmask(SIG_BLOCK, ~[RT_1],  <unfinished ...>
952236 <... madvise resumed>)           = 0
952234 <... munmap resumed>)            = 0
952238 <... exit resumed>)              = ?
952237 <... rt_sigprocmask resumed>NULL, 8) = 0
952236 exit(0 <unfinished ...>
952235 <... rt_sigprocmask resumed>NULL, 8) = 0
952238 +++ exited with 0 +++
952237 madvise(0x7f036c006000, 8368128, MADV_DONTNEED <unfinished ...>
952236 <... exit resumed>)              = ?
952234 munmap(0x7f036d809000, 16384 <unfinished ...>
952235 madvise(0x7f036d008000, 8368128, MADV_DONTNEED <unfinished ...>
952237 <... madvise resumed>)           = 0
952236 +++ exited with 0 +++
952234 <... munmap resumed>)            = 0
952235 <... madvise resumed>)           = 0
952237 exit(0 <unfinished ...>
952234 close(11 <unfinished ...>
952235 exit(0 <unfinished ...>
952237 <... exit resumed>)              = ?
952235 <... exit resumed>)              = ?
952234 <... close resumed>)             = 0
952237 +++ exited with 0 +++
952235 +++ exited with 0 +++
952234 close(14)                        = 0
952234 close(10)                        = 0
952234 rt_sigprocmask(SIG_BLOCK, ~[RT_1], NULL, 8) = 0
952234 madvise(0x7f036d80d000, 8368128, MADV_DONTNEED) = 0
952234 exit(0)                          = ?
952233 <... futex resumed>)             = 0
952234 +++ exited with 0 +++
952233 munmap(0x7f036d80d000, 8392704)  = 0
952233 io_uring_enter(4, 2, 2, IORING_ENTER_GETEVENTS, NULL, 0) = 2
952233 epoll_pwait(3, [], 1024, 0, NULL, 8) = 0
952233 close(7)                         = 0
952233 close(8)                         = 0
952233 munmap(0x7f036e590000, 8256)     = 0
952233 munmap(0x7f036e464000, 16384)    = 0
952233 close(4)                         = 0
952233 close(9)                         = 0
952233 close(3)                         = 0
952233 futex(0x6ba5de8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
952233 fstat(0, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1), ...}) = 0
952233 fcntl(0, F_GETFL)                = 0x402 (flags O_RDWR|O_APPEND)
952233 rt_sigprocmask(SIG_BLOCK, [TTOU], NULL, 8) = 0
952233 ioctl(0, TCSETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952233 ioctl(0, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952233 rt_sigprocmask(SIG_UNBLOCK, [TTOU], NULL, 8) = 0
952233 fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1), ...}) = 0
952233 fcntl(1, F_GETFL)                = 0x402 (flags O_RDWR|O_APPEND)
952233 rt_sigprocmask(SIG_BLOCK, [TTOU], NULL, 8) = 0
952233 ioctl(1, TCSETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952233 ioctl(1, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952233 rt_sigprocmask(SIG_UNBLOCK, [TTOU], NULL, 8) = 0
952233 fstat(2, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x1), ...}) = 0
952233 fcntl(2, F_GETFL)                = 0x8002 (flags O_RDWR|O_LARGEFILE)
952233 rt_sigprocmask(SIG_BLOCK, [TTOU], NULL, 8) = 0
952233 ioctl(2, TCSETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952233 ioctl(2, TCGETS, {c_iflag=ICRNL|IXON|IXANY|IMAXBEL, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B9600|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
952233 rt_sigprocmask(SIG_UNBLOCK, [TTOU], NULL, 8) = 0
952233 close(5)                         = 0
952233 close(6)                         = 0
952233 futex(0x6ba5888, FUTEX_WAKE_PRIVATE, 1) = 1
952243 <... futex resumed>)             = 0
952233 futex(0x7f034773f990, FUTEX_WAIT_BITSET|FUTEX_CLOCK_REALTIME, 952240, NULL, FUTEX_BITSET_MATCH_ANY <unfinished ...>
952243 futex(0x6ba588c, FUTEX_WAKE_PRIVATE, 1) = 1
952240 <... futex resumed>)             = 0
952243 futex(0x6ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952240 futex(0x6ba588c, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952243 <... futex resumed>)             = 0
952240 <... futex resumed>)             = 1
952241 <... futex resumed>)             = 0
952243 rt_sigprocmask(SIG_BLOCK, ~[RT_1],  <unfinished ...>
952240 futex(0x6ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952241 futex(0x6ba588c, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952243 <... rt_sigprocmask resumed>NULL, 8) = 0
952240 <... futex resumed>)             = 0
952242 <... futex resumed>)             = 0
952243 madvise(0x7f034573c000, 8368128, MADV_DONTNEED <unfinished ...>
952241 <... futex resumed>)             = 1
952242 futex(0x6ba5820, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
952240 rt_sigprocmask(SIG_BLOCK, ~[RT_1],  <unfinished ...>
952243 <... madvise resumed>)           = 0
952242 <... futex resumed>)             = -1 EAGAIN (Resource temporarily unavailable)
952241 futex(0x6ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952243 exit(0 <unfinished ...>
952242 futex(0x6ba5820, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
952240 <... rt_sigprocmask resumed>NULL, 8) = 0
952243 <... exit resumed>)              = ?
952242 <... futex resumed>)             = 0
952241 <... futex resumed>)             = 0
952243 +++ exited with 0 +++
952242 rt_sigprocmask(SIG_BLOCK, ~[RT_1],  <unfinished ...>
952240 madvise(0x7f0346f3f000, 8368128, MADV_DONTNEED <unfinished ...>
952242 <... rt_sigprocmask resumed>NULL, 8) = 0
952241 rt_sigprocmask(SIG_BLOCK, ~[RT_1],  <unfinished ...>
952242 madvise(0x7f0345f3d000, 8368128, MADV_DONTNEED <unfinished ...>
952240 <... madvise resumed>)           = 0
952241 <... rt_sigprocmask resumed>NULL, 8) = 0
952242 <... madvise resumed>)           = 0
952240 exit(0 <unfinished ...>
952241 madvise(0x7f034673e000, 8368128, MADV_DONTNEED <unfinished ...>
952242 exit(0 <unfinished ...>
952240 <... exit resumed>)              = ?
952242 <... exit resumed>)              = ?
952242 +++ exited with 0 +++
952240 +++ exited with 0 +++
952233 <... futex resumed>)             = 0
952241 <... madvise resumed>)           = 0
952233 munmap(0x7f036d008000, 8392704 <unfinished ...>
952241 exit(0)                          = ?
952233 <... munmap resumed>)            = 0
952233 munmap(0x7f036c807000, 8392704 <unfinished ...>
952241 +++ exited with 0 +++
952233 <... munmap resumed>)            = 0
952233 munmap(0x7f036c006000, 8392704)  = 0
952233 munmap(0x7f03677ff000, 8392704)  = 0
952233 exit_group(0)                    = ?
952239 <... futex resumed>)             = ?
952239 +++ exited with 0 +++

@bnoordhuis
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O_DIRECT requires that the buffer is a multiple of 512 but also that it's aligned on a 512 byte boundary. Not all file systems enforce that but some do.

In node, it's not very practical to get a buffer with a particular alignment so you're probably out of luck.

@hillar
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hillar commented Feb 15, 2025

In node, it's not very practical to get a buffer with a particular alignment so you're probably out of luck.

sorry, english is not my first language, should i read it: in nodejs there is no way to tell to the linux kernel to bypass page cache

@bnoordhuis
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Yes, that's what I mean.

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