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task.c
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task.c
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/* task.c - core analysis suite
*
* Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
* Copyright (C) 2002-2014 David Anderson
* Copyright (C) 2002-2014 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "defs.h"
static ulong get_panic_context(void);
static int sort_by_pid(const void *, const void *);
static void show_ps(ulong, struct psinfo *);
static struct task_context *panic_search(void);
static void allocate_task_space(int);
static void refresh_fixed_task_table(void);
static void refresh_unlimited_task_table(void);
static void refresh_pidhash_task_table(void);
static void refresh_pid_hash_task_table(void);
static void refresh_hlist_task_table(void);
static void refresh_hlist_task_table_v2(void);
static void refresh_hlist_task_table_v3(void);
static void refresh_active_task_table(void);
static struct task_context *store_context(struct task_context *, ulong, char *);
static void refresh_context(ulong, ulong);
static void parent_list(ulong);
static void child_list(ulong);
static void initialize_task_state(void);
static void dump_task_states(void);
static void show_ps_data(ulong, struct task_context *);
static void show_task_times(struct task_context *, ulong);
static void show_task_args(struct task_context *);
static void show_task_rlimit(struct task_context *);
static void show_tgid_list(ulong);
static int compare_start_time(const void *, const void *);
static int start_time_timespec(void);
static ulonglong convert_start_time(ulonglong, ulonglong);
static ulong get_dumpfile_panic_task(void);
static ulong get_active_set_panic_task(void);
static void populate_panic_threads(void);
static int verify_task(struct task_context *, int);
static ulong get_idle_task(int, char *);
static ulong get_curr_task(int, char *);
static long rq_idx(int);
static long cpu_idx(int);
static void dump_runq(void);
static void dump_on_rq_timestamp(void);
static void dump_runqueues(void);
static void dump_prio_array(int, ulong, char *);
static void dump_task_runq_entry(struct task_context *, int);
static void print_group_header_fair(int, ulong, void *);
static void print_parent_task_group_fair(void *, int);
static int dump_tasks_in_lower_dequeued_cfs_rq(int, ulong, int, struct task_context *);
static int dump_tasks_in_cfs_rq(ulong);
static int dump_tasks_in_task_group_cfs_rq(int, ulong, int, struct task_context *);
static void dump_on_rq_tasks(void);
static void cfs_rq_offset_init(void);
static void task_group_offset_init(void);
static void dump_CFS_runqueues(void);
static void print_group_header_rt(ulong, void *);
static void print_parent_task_group_rt(void *, int);
static int dump_tasks_in_lower_dequeued_rt_rq(int, ulong, int);
static int dump_RT_prio_array(ulong, char *);
static void dump_tasks_in_task_group_rt_rq(int, ulong, int);
static char *get_task_group_name(ulong);
static void sort_task_group_info_array(void);
static void print_task_group_info_array(void);
static void reuse_task_group_info_array(void);
static void free_task_group_info_array(void);
static void fill_task_group_info_array(int, ulong, char *, int);
static void dump_tasks_by_task_group(void);
static void task_struct_member(struct task_context *,unsigned int, struct reference *);
static void signal_reference(struct task_context *, ulong, struct reference *);
static void do_sig_thread_group(ulong);
static void dump_signal_data(struct task_context *, ulong);
#define TASK_LEVEL (0x1)
#define THREAD_GROUP_LEVEL (0x2)
#define TASK_INDENT (0x4)
static int sigrt_minmax(int *, int *);
static void signame_list(void);
static void sigqueue_list(ulong);
static ulonglong task_signal(ulong, ulong*);
static ulonglong task_blocked(ulong);
static void translate_sigset(ulonglong);
static ulonglong sigaction_mask(ulong);
static int task_has_cpu(ulong, char *);
static int is_foreach_keyword(char *, int *);
static void foreach_cleanup(void *);
static void ps_cleanup(void *);
static char *task_pointer_string(struct task_context *, ulong, char *);
static int panic_context_adjusted(struct task_context *tc);
static void show_last_run(struct task_context *);
static int sort_by_last_run(const void *arg1, const void *arg2);
static void sort_context_array_by_last_run(void);
static void irqstacks_init(void);
/*
* Figure out how much space will be required to hold the task context
* data, malloc() it, and call refresh_task_table() to fill it up.
* Gather a few key offset and size values. Lastly, get, and then set,
* the initial context.
*/
void
task_init(void)
{
long len;
int dim;
struct syment *nsp;
long tss_offset, thread_offset;
long eip_offset, esp_offset, ksp_offset;
struct gnu_request req;
ulong active_pid;
if (!(tt->idle_threads = (ulong *)calloc(NR_CPUS, sizeof(ulong))))
error(FATAL, "cannot malloc idle_threads array");
if (DUMPFILE() &&
!(tt->panic_threads = (ulong *)calloc(NR_CPUS, sizeof(ulong))))
error(FATAL, "cannot malloc panic_threads array");
if (kernel_symbol_exists("nr_tasks")) {
/*
* Figure out what maximum NR_TASKS would be by getting the
* address of the next symbol after "task".
*/
tt->task_start = symbol_value("task");
if ((nsp = next_symbol("task", NULL)) == NULL)
error(FATAL, "cannot determine size of task table\n");
tt->flags |= TASK_ARRAY_EXISTS;
tt->task_end = nsp->value;
tt->max_tasks = (tt->task_end-tt->task_start) / sizeof(void *);
allocate_task_space(tt->max_tasks);
tss_offset = MEMBER_OFFSET_INIT(task_struct_tss,
"task_struct", "tss");
eip_offset = MEMBER_OFFSET_INIT(thread_struct_eip,
"thread_struct", "eip");
esp_offset = MEMBER_OFFSET_INIT(thread_struct_esp,
"thread_struct", "esp");
ksp_offset = MEMBER_OFFSET_INIT(thread_struct_ksp,
"thread_struct", "ksp");
ASSIGN_OFFSET(task_struct_tss_eip) =
(eip_offset == INVALID_OFFSET) ?
INVALID_OFFSET : tss_offset + eip_offset;
ASSIGN_OFFSET(task_struct_tss_esp) =
(esp_offset == INVALID_OFFSET) ?
INVALID_OFFSET : tss_offset + esp_offset;
ASSIGN_OFFSET(task_struct_tss_ksp) =
(ksp_offset == INVALID_OFFSET) ?
INVALID_OFFSET : tss_offset + ksp_offset;
tt->flags |= TASK_REFRESH;
tt->refresh_task_table = refresh_fixed_task_table;
readmem(tt->task_start, KVADDR, &tt->idle_threads[0],
kt->cpus * sizeof(void *), "idle threads",
FAULT_ON_ERROR);
} else {
/*
* Make the task table big enough to hold what's running.
* It can be realloc'd later if it grows on a live system.
*/
get_symbol_data("nr_threads", sizeof(int), &tt->nr_threads);
tt->max_tasks = tt->nr_threads + NR_CPUS + TASK_SLUSH;
allocate_task_space(tt->max_tasks);
thread_offset = MEMBER_OFFSET_INIT(task_struct_thread,
"task_struct", "thread");
eip_offset = MEMBER_OFFSET_INIT(thread_struct_eip,
"thread_struct", "eip");
esp_offset = MEMBER_OFFSET_INIT(thread_struct_esp,
"thread_struct", "esp");
/*
* Handle x86/x86_64 merger.
*/
if (eip_offset == INVALID_OFFSET)
eip_offset = MEMBER_OFFSET_INIT(thread_struct_eip,
"thread_struct", "ip");
if (esp_offset == INVALID_OFFSET)
esp_offset = MEMBER_OFFSET_INIT(thread_struct_esp,
"thread_struct", "sp");
ksp_offset = MEMBER_OFFSET_INIT(thread_struct_ksp,
"thread_struct", "ksp");
ASSIGN_OFFSET(task_struct_thread_eip) =
(eip_offset == INVALID_OFFSET) ?
INVALID_OFFSET : thread_offset + eip_offset;
ASSIGN_OFFSET(task_struct_thread_esp) =
(esp_offset == INVALID_OFFSET) ?
INVALID_OFFSET : thread_offset + esp_offset;
ASSIGN_OFFSET(task_struct_thread_ksp) =
(ksp_offset == INVALID_OFFSET) ?
INVALID_OFFSET : thread_offset + ksp_offset;
tt->flags |= TASK_REFRESH;
tt->refresh_task_table = refresh_unlimited_task_table;
get_idle_threads(&tt->idle_threads[0], kt->cpus);
}
if (MEMBER_EXISTS("task_struct", "thread_info"))
MEMBER_OFFSET_INIT(task_struct_thread_info, "task_struct",
"thread_info");
else if (MEMBER_EXISTS("task_struct", "stack"))
MEMBER_OFFSET_INIT(task_struct_thread_info, "task_struct",
"stack");
else
ASSIGN_OFFSET(task_struct_thread_info) = INVALID_OFFSET;
if (VALID_MEMBER(task_struct_thread_info)) {
MEMBER_OFFSET_INIT(thread_info_task, "thread_info", "task");
MEMBER_OFFSET_INIT(thread_info_cpu, "thread_info", "cpu");
MEMBER_OFFSET_INIT(thread_info_flags, "thread_info", "flags");
MEMBER_OFFSET_INIT(thread_info_previous_esp, "thread_info",
"previous_esp");
STRUCT_SIZE_INIT(thread_info, "thread_info");
tt->flags |= THREAD_INFO;
}
MEMBER_OFFSET_INIT(task_struct_state, "task_struct", "state");
MEMBER_OFFSET_INIT(task_struct_exit_state, "task_struct", "exit_state");
MEMBER_OFFSET_INIT(task_struct_pid, "task_struct", "pid");
MEMBER_OFFSET_INIT(task_struct_comm, "task_struct", "comm");
MEMBER_OFFSET_INIT(task_struct_next_task, "task_struct", "next_task");
MEMBER_OFFSET_INIT(task_struct_processor, "task_struct", "processor");
MEMBER_OFFSET_INIT(task_struct_p_pptr, "task_struct", "p_pptr");
MEMBER_OFFSET_INIT(task_struct_parent, "task_struct", "parent");
if (INVALID_MEMBER(task_struct_parent))
MEMBER_OFFSET_INIT(task_struct_parent, "task_struct",
"real_parent");
MEMBER_OFFSET_INIT(task_struct_has_cpu, "task_struct", "has_cpu");
MEMBER_OFFSET_INIT(task_struct_cpus_runnable,
"task_struct", "cpus_runnable");
MEMBER_OFFSET_INIT(task_struct_cpu, "task_struct", "cpu");
MEMBER_OFFSET_INIT(task_struct_active_mm, "task_struct", "active_mm");
MEMBER_OFFSET_INIT(task_struct_next_run, "task_struct", "next_run");
MEMBER_OFFSET_INIT(task_struct_flags, "task_struct", "flags");
MEMBER_OFFSET_INIT(task_struct_pidhash_next,
"task_struct", "pidhash_next");
MEMBER_OFFSET_INIT(task_struct_pgrp, "task_struct", "pgrp");
MEMBER_OFFSET_INIT(task_struct_tgid, "task_struct", "tgid");
MEMBER_OFFSET_INIT(task_struct_pids, "task_struct", "pids");
MEMBER_OFFSET_INIT(task_struct_last_run, "task_struct", "last_run");
MEMBER_OFFSET_INIT(task_struct_timestamp, "task_struct", "timestamp");
MEMBER_OFFSET_INIT(task_struct_sched_info, "task_struct", "sched_info");
if (VALID_MEMBER(task_struct_sched_info))
MEMBER_OFFSET_INIT(sched_info_last_arrival,
"sched_info", "last_arrival");
if (VALID_MEMBER(task_struct_last_run) ||
VALID_MEMBER(task_struct_timestamp) ||
VALID_MEMBER(sched_info_last_arrival)) {
char buf[BUFSIZE];
strcpy(buf, "alias last ps -l");
alias_init(buf);
}
MEMBER_OFFSET_INIT(pid_link_pid, "pid_link", "pid");
MEMBER_OFFSET_INIT(pid_hash_chain, "pid", "hash_chain");
STRUCT_SIZE_INIT(pid_link, "pid_link");
STRUCT_SIZE_INIT(upid, "upid");
if (VALID_STRUCT(upid)) {
MEMBER_OFFSET_INIT(upid_nr, "upid", "nr");
MEMBER_OFFSET_INIT(upid_ns, "upid", "ns");
MEMBER_OFFSET_INIT(upid_pid_chain, "upid", "pid_chain");
MEMBER_OFFSET_INIT(pid_numbers, "pid", "numbers");
MEMBER_OFFSET_INIT(pid_tasks, "pid", "tasks");
tt->init_pid_ns = symbol_value("init_pid_ns");
}
MEMBER_OFFSET_INIT(pid_pid_chain, "pid", "pid_chain");
STRUCT_SIZE_INIT(task_struct, "task_struct");
MEMBER_OFFSET_INIT(task_struct_sig, "task_struct", "sig");
MEMBER_OFFSET_INIT(task_struct_signal, "task_struct", "signal");
MEMBER_OFFSET_INIT(task_struct_blocked, "task_struct", "blocked");
MEMBER_OFFSET_INIT(task_struct_sigpending, "task_struct", "sigpending");
MEMBER_OFFSET_INIT(task_struct_pending, "task_struct", "pending");
MEMBER_OFFSET_INIT(task_struct_sigqueue, "task_struct", "sigqueue");
MEMBER_OFFSET_INIT(task_struct_sighand, "task_struct", "sighand");
MEMBER_OFFSET_INIT(signal_struct_count, "signal_struct", "count");
MEMBER_OFFSET_INIT(signal_struct_nr_threads, "signal_struct", "nr_threads");
MEMBER_OFFSET_INIT(signal_struct_action, "signal_struct", "action");
MEMBER_OFFSET_INIT(signal_struct_shared_pending, "signal_struct",
"shared_pending");
MEMBER_OFFSET_INIT(k_sigaction_sa, "k_sigaction", "sa");
MEMBER_OFFSET_INIT(sigaction_sa_handler, "sigaction", "sa_handler");
MEMBER_OFFSET_INIT(sigaction_sa_mask, "sigaction", "sa_mask");
MEMBER_OFFSET_INIT(sigaction_sa_flags, "sigaction", "sa_flags");
MEMBER_OFFSET_INIT(sigpending_head, "sigpending", "head");
if (INVALID_MEMBER(sigpending_head))
MEMBER_OFFSET_INIT(sigpending_list, "sigpending", "list");
MEMBER_OFFSET_INIT(sigpending_signal, "sigpending", "signal");
MEMBER_SIZE_INIT(sigpending_signal, "sigpending", "signal");
STRUCT_SIZE_INIT(sigqueue, "sigqueue");
STRUCT_SIZE_INIT(signal_queue, "signal_queue");
STRUCT_SIZE_INIT(sighand_struct, "sighand_struct");
if (VALID_STRUCT(sighand_struct))
MEMBER_OFFSET_INIT(sighand_struct_action, "sighand_struct",
"action");
MEMBER_OFFSET_INIT(siginfo_si_signo, "siginfo", "si_signo");
STRUCT_SIZE_INIT(signal_struct, "signal_struct");
STRUCT_SIZE_INIT(k_sigaction, "k_sigaction");
MEMBER_OFFSET_INIT(task_struct_start_time, "task_struct", "start_time");
MEMBER_SIZE_INIT(task_struct_start_time, "task_struct", "start_time");
MEMBER_SIZE_INIT(task_struct_utime, "task_struct", "utime");
MEMBER_SIZE_INIT(task_struct_stime, "task_struct", "stime");
MEMBER_OFFSET_INIT(task_struct_times, "task_struct", "times");
MEMBER_OFFSET_INIT(tms_tms_utime, "tms", "tms_utime");
MEMBER_OFFSET_INIT(tms_tms_stime, "tms", "tms_stime");
MEMBER_OFFSET_INIT(task_struct_utime, "task_struct", "utime");
MEMBER_OFFSET_INIT(task_struct_stime, "task_struct", "stime");
STRUCT_SIZE_INIT(cputime_t, "cputime_t");
if (symbol_exists("cfq_slice_async")) {
uint cfq_slice_async;
get_symbol_data("cfq_slice_async", sizeof(int),
&cfq_slice_async);
if (cfq_slice_async) {
machdep->hz = cfq_slice_async * 25;
if (CRASHDEBUG(2))
fprintf(fp,
"cfq_slice_async exists: setting hz to %d\n",
machdep->hz);
}
}
if (VALID_MEMBER(runqueue_arrays))
MEMBER_OFFSET_INIT(task_struct_run_list, "task_struct",
"run_list");
MEMBER_OFFSET_INIT(task_struct_rss_stat, "task_struct",
"rss_stat");
MEMBER_OFFSET_INIT(task_rss_stat_count, "task_rss_stat",
"count");
if ((tt->task_struct = (char *)malloc(SIZE(task_struct))) == NULL)
error(FATAL, "cannot malloc task_struct space.");
if ((tt->mm_struct = (char *)malloc(SIZE(mm_struct))) == NULL)
error(FATAL, "cannot malloc mm_struct space.");
if ((tt->flags & THREAD_INFO) &&
((tt->thread_info = (char *)malloc(SIZE(thread_info))) == NULL))
error(FATAL, "cannot malloc thread_info space.");
STRUCT_SIZE_INIT(task_union, "task_union");
STRUCT_SIZE_INIT(thread_union, "thread_union");
if (VALID_SIZE(task_union) && (SIZE(task_union) != STACKSIZE())) {
error(WARNING, "\nnon-standard stack size: %ld\n",
len = SIZE(task_union));
machdep->stacksize = len;
} else if (VALID_SIZE(thread_union) &&
((len = SIZE(thread_union)) != STACKSIZE()))
machdep->stacksize = len;
if (symbol_exists("pidhash") && symbol_exists("pid_hash") &&
!symbol_exists("pidhash_shift"))
error(FATAL,
"pidhash and pid_hash both exist -- cannot distinquish between them\n");
if (symbol_exists("pid_hash") && symbol_exists("pidhash_shift")) {
int pidhash_shift;
if (get_symbol_type("PIDTYPE_PID", NULL, &req) !=
TYPE_CODE_ENUM)
error(FATAL,
"cannot determine PIDTYPE_PID pid_hash dimension\n");
get_symbol_data("pidhash_shift", sizeof(int), &pidhash_shift);
tt->pidhash_len = 1 << pidhash_shift;
get_symbol_data("pid_hash", sizeof(ulong), &tt->pidhash_addr);
if (VALID_MEMBER(pid_link_pid) && VALID_MEMBER(pid_hash_chain)) {
get_symbol_data("pid_hash", sizeof(ulong), &tt->pidhash_addr);
tt->refresh_task_table = refresh_pid_hash_task_table;
} else {
tt->pidhash_addr = symbol_value("pid_hash");
if (LKCD_KERNTYPES()) {
if (VALID_STRUCT(pid_link)) {
if (VALID_STRUCT(upid) && VALID_MEMBER(pid_numbers))
tt->refresh_task_table =
refresh_hlist_task_table_v3;
else
tt->refresh_task_table =
refresh_hlist_task_table_v2;
} else
tt->refresh_task_table =
refresh_hlist_task_table;
builtin_array_length("pid_hash",
tt->pidhash_len, NULL);
} else {
if (!get_array_length("pid_hash", NULL,
sizeof(void *)) && VALID_STRUCT(pid_link)) {
if (VALID_STRUCT(upid) && VALID_MEMBER(pid_numbers))
tt->refresh_task_table =
refresh_hlist_task_table_v3;
else
tt->refresh_task_table =
refresh_hlist_task_table_v2;
}
else
tt->refresh_task_table =
refresh_hlist_task_table;
}
}
tt->flags |= PID_HASH;
} else if (symbol_exists("pid_hash")) {
if (get_symbol_type("PIDTYPE_PGID", NULL, &req) !=
TYPE_CODE_ENUM)
error(FATAL,
"cannot determine PIDTYPE_PID pid_hash dimension\n");
if (!(tt->pidhash_len = get_array_length("pid_hash",
&dim, SIZE(list_head))))
error(FATAL,
"cannot determine pid_hash array dimensions\n");
tt->pidhash_addr = symbol_value("pid_hash");
tt->refresh_task_table = refresh_pid_hash_task_table;
tt->flags |= PID_HASH;
} else if (symbol_exists("pidhash")) {
tt->pidhash_addr = symbol_value("pidhash");
tt->pidhash_len = get_array_length("pidhash", NULL, 0);
if (tt->pidhash_len == 0) {
if (!(nsp = next_symbol("pidhash", NULL)))
error(FATAL,
"cannot determine pidhash length\n");
tt->pidhash_len =
(nsp->value-tt->pidhash_addr) / sizeof(void *);
}
if (ACTIVE())
tt->refresh_task_table = refresh_pidhash_task_table;
tt->flags |= PIDHASH;
}
/*
* Get the IRQ stacks info if it's configured.
*/
if (VALID_STRUCT(irq_ctx))
irqstacks_init();
get_active_set();
if (tt->flags & ACTIVE_ONLY)
tt->refresh_task_table = refresh_active_task_table;
tt->refresh_task_table();
if (tt->flags & TASK_REFRESH_OFF)
tt->flags &= ~(TASK_REFRESH|TASK_REFRESH_OFF);
if (ACTIVE()) {
active_pid = REMOTE() ? pc->server_pid : pc->program_pid;
set_context(NO_TASK, active_pid);
tt->this_task = pid_to_task(active_pid);
}
else {
if (KDUMP_DUMPFILE() && !(pc->flags2 & QEMU_MEM_DUMP))
map_cpus_to_prstatus();
else if (ELF_NOTES_VALID() && DISKDUMP_DUMPFILE())
map_cpus_to_prstatus_kdump_cmprs();
please_wait("determining panic task");
set_context(get_panic_context(), NO_PID);
please_wait_done();
}
sort_context_array();
if (pc->flags & SILENT)
initialize_task_state();
tt->flags |= TASK_INIT_DONE;
}
/*
* Store the pointers to the hard and soft irq_ctx arrays as well as
* the task pointers contained within each of them.
*/
static void
irqstacks_init(void)
{
int i;
char *thread_info_buf;
struct syment *hard_sp, *soft_sp;
if (!(tt->hardirq_ctx = (ulong *)calloc(NR_CPUS, sizeof(ulong))))
error(FATAL, "cannot malloc hardirq_ctx space.");
if (!(tt->hardirq_tasks = (ulong *)calloc(NR_CPUS, sizeof(ulong))))
error(FATAL, "cannot malloc hardirq_tasks space.");
if (!(tt->softirq_ctx = (ulong *)calloc(NR_CPUS, sizeof(ulong))))
error(FATAL, "cannot malloc softirq_ctx space.");
if (!(tt->softirq_tasks = (ulong *)calloc(NR_CPUS, sizeof(ulong))))
error(FATAL, "cannot malloc softirq_tasks space.");
thread_info_buf = GETBUF(SIZE(irq_ctx));
if ((hard_sp = per_cpu_symbol_search("per_cpu__hardirq_ctx"))) {
if ((kt->flags & SMP) && (kt->flags & PER_CPU_OFF)) {
for (i = 0; i < NR_CPUS; i++) {
if (!kt->__per_cpu_offset[i])
continue;
tt->hardirq_ctx[i] = hard_sp->value +
kt->__per_cpu_offset[i];
}
} else
tt->hardirq_ctx[0] = hard_sp->value;
} else if (symbol_exists("hardirq_ctx")) {
i = get_array_length("hardirq_ctx", NULL, 0);
get_symbol_data("hardirq_ctx",
sizeof(long)*(i <= NR_CPUS ? i : NR_CPUS),
&tt->hardirq_ctx[0]);
} else
error(WARNING, "cannot determine hardirq_ctx addresses\n");
for (i = 0; i < NR_CPUS; i++) {
if (!(tt->hardirq_ctx[i]))
continue;
if (!readmem(tt->hardirq_ctx[i], KVADDR, thread_info_buf,
SIZE(irq_ctx), "hardirq thread_union",
RETURN_ON_ERROR)) {
error(INFO, "cannot read hardirq_ctx[%d] at %lx\n",
i, tt->hardirq_ctx[i]);
continue;
}
tt->hardirq_tasks[i] =
ULONG(thread_info_buf+OFFSET(thread_info_task));
}
if ((soft_sp = per_cpu_symbol_search("per_cpu__softirq_ctx"))) {
if ((kt->flags & SMP) && (kt->flags & PER_CPU_OFF)) {
for (i = 0; i < NR_CPUS; i++) {
if (!kt->__per_cpu_offset[i])
continue;
tt->softirq_ctx[i] = soft_sp->value +
kt->__per_cpu_offset[i];
}
} else
tt->softirq_ctx[0] = soft_sp->value;
} else if (symbol_exists("softirq_ctx")) {
i = get_array_length("softirq_ctx", NULL, 0);
get_symbol_data("softirq_ctx",
sizeof(long)*(i <= NR_CPUS ? i : NR_CPUS),
&tt->softirq_ctx[0]);
} else
error(WARNING, "cannot determine softirq_ctx addresses\n");
for (i = 0; i < NR_CPUS; i++) {
if (!(tt->softirq_ctx[i]))
continue;
if (!readmem(tt->softirq_ctx[i], KVADDR, thread_info_buf,
SIZE(irq_ctx), "softirq thread_union",
RETURN_ON_ERROR)) {
error(INFO, "cannot read softirq_ctx[%d] at %lx\n",
i, tt->hardirq_ctx[i]);
continue;
}
tt->softirq_tasks[i] =
ULONG(thread_info_buf+OFFSET(thread_info_task));
}
tt->flags |= IRQSTACKS;
FREEBUF(thread_info_buf);
}
int
in_irq_ctx(ulonglong type, int cpu, ulong addr)
{
if (!(tt->flags & IRQSTACKS))
return FALSE;
switch (type)
{
case BT_SOFTIRQ:
if (tt->softirq_ctx[cpu] &&
(addr >= tt->softirq_ctx[cpu]) &&
(addr < (tt->softirq_ctx[cpu] + STACKSIZE())))
return TRUE;
break;
case BT_HARDIRQ:
if (tt->hardirq_ctx[cpu] &&
(addr >= tt->hardirq_ctx[cpu]) &&
(addr < (tt->hardirq_ctx[cpu] + STACKSIZE())))
return TRUE;
break;
}
return FALSE;
}
/*
* Allocate or re-allocated space for the task_context array and task list.
*/
static void
allocate_task_space(int cnt)
{
if (tt->context_array == NULL) {
if (!(tt->task_local = (void *)
malloc(cnt * sizeof(void *))))
error(FATAL,
"cannot malloc kernel task array (%d tasks)", cnt);
if (!(tt->context_array = (struct task_context *)
malloc(cnt * sizeof(struct task_context))))
error(FATAL, "cannot malloc context array (%d tasks)",
cnt);
} else {
if (!(tt->task_local = (void *)
realloc(tt->task_local, cnt * sizeof(void *))))
error(FATAL,
"%scannot realloc kernel task array (%d tasks)",
(pc->flags & RUNTIME) ? "" : "\n", cnt);
if (!(tt->context_array = (struct task_context *)
realloc(tt->context_array,
cnt * sizeof(struct task_context))))
error(FATAL,
"%scannot realloc context array (%d tasks)",
(pc->flags & RUNTIME) ? "" : "\n", cnt);
}
}
/*
* This routine runs one time on dumpfiles, and constantly on live systems.
* It walks through the kernel task array looking for active tasks, and
* populates the local task table with their essential data.
*/
static void
refresh_fixed_task_table(void)
{
int i;
ulong *tlp;
struct task_context *tc;
ulong curtask;
ulong retries;
ulong curpid;
char *tp;
#define TASK_FREE(x) ((x == 0) || (((ulong)(x) >= tt->task_start) && \
((ulong)(x) < tt->task_end)))
#define TASK_IN_USE(x) (!TASK_FREE(x))
if (DUMPFILE() && (tt->flags & TASK_INIT_DONE))
return;
if (DUMPFILE()) {
fprintf(fp, (pc->flags & SILENT) || !(pc->flags & TTY) ?
"" : "%splease wait... (gathering task table data)",
GDB_PATCHED() ? "" : "\n");
fflush(fp);
if (!symbol_exists("panic_threads"))
tt->flags |= POPULATE_PANIC;
}
if (ACTIVE() && !(tt->flags & TASK_REFRESH))
return;
curpid = NO_PID;
curtask = NO_TASK;
/*
* The current task's task_context entry may change,
* or the task may not even exist anymore.
*/
if (ACTIVE() && (tt->flags & TASK_INIT_DONE)) {
curtask = CURRENT_TASK();
curpid = CURRENT_PID();
}
retries = 0;
retry:
if (!readmem(tt->task_start, KVADDR, tt->task_local,
tt->max_tasks * sizeof(void *), "kernel task array",
RETURN_ON_ERROR))
error(FATAL, "cannot read kernel task array");
clear_task_cache();
for (i = 0, tlp = (ulong *)tt->task_local,
tt->running_tasks = 0, tc = tt->context_array;
i < tt->max_tasks; i++, tlp++) {
if (TASK_IN_USE(*tlp)) {
if (!(tp = fill_task_struct(*tlp))) {
if (DUMPFILE())
continue;
retries++;
goto retry;
}
if (store_context(tc, *tlp, tp)) {
tc++;
tt->running_tasks++;
}
}
}
if (DUMPFILE()) {
fprintf(fp, (pc->flags & SILENT) || !(pc->flags & TTY) ? "" :
"\r \r");
fflush(fp);
}
if (ACTIVE() && (tt->flags & TASK_INIT_DONE))
refresh_context(curtask, curpid);
tt->retries = MAX(tt->retries, retries);
}
/*
* Verify that a task_context's data makes sense enough to include
* in the task_context array.
*/
static int
verify_task(struct task_context *tc, int level)
{
int i;
ulong next_task;
ulong readflag;
readflag = ACTIVE() ? (RETURN_ON_ERROR|QUIET) : (RETURN_ON_ERROR);
switch (level)
{
case 1:
if (!readmem(tc->task + OFFSET(task_struct_next_task),
KVADDR, &next_task, sizeof(void *), "next_task", readflag)) {
return FALSE;
}
if (!IS_TASK_ADDR(next_task))
return FALSE;
if (tc->processor & ~NO_PROC_ID)
return FALSE;
/* fall through */
case 2:
if (!IS_TASK_ADDR(tc->ptask))
return FALSE;
if ((tc->processor < 0) || (tc->processor >= NR_CPUS)) {
for (i = 0; i < NR_CPUS; i++) {
if (tc->task == tt->active_set[i]) {
error(WARNING,
"active task %lx on cpu %d: corrupt cpu value: %u\n\n",
tc->task, i, tc->processor);
tc->processor = i;
return TRUE;
}
}
if (CRASHDEBUG(1))
error(INFO,
"verify_task: task: %lx invalid processor: %u",
tc->task, tc->processor);
return FALSE;
}
break;
}
return TRUE;
}
/*
* This routine runs one time on dumpfiles, and constantly on live systems.
* It walks through the kernel task array looking for active tasks, and
* populates the local task table with their essential data.
*/
#define MAX_UNLIMITED_TASK_RETRIES (500)
void
refresh_unlimited_task_table(void)
{
int i;
ulong *tlp;
struct task_context *tc;
ulong curtask;
ulong curpid;
struct list_data list_data, *ld;
ulong init_tasks[NR_CPUS];
ulong retries;
char *tp;
int cnt;
if (DUMPFILE() && (tt->flags & TASK_INIT_DONE))
return;
if (DUMPFILE()) {
fprintf(fp, (pc->flags & SILENT) || !(pc->flags & TTY) ?
"" : "%splease wait... (gathering task table data)",
GDB_PATCHED() ? "" : "\n");
fflush(fp);
if (!symbol_exists("panic_threads"))
tt->flags |= POPULATE_PANIC;
}
if (ACTIVE() && !(tt->flags & TASK_REFRESH))
return;
curpid = NO_PID;
curtask = NO_TASK;
tp = NULL;
/*
* The current task's task_context entry may change,
* or the task may not even exist anymore.
*/
if (ACTIVE() && (tt->flags & TASK_INIT_DONE)) {
curtask = CURRENT_TASK();
curpid = CURRENT_PID();
}
retries = 0;
retry:
if (retries && DUMPFILE()) {
if (tt->flags & PIDHASH) {
error(WARNING,
"\ncannot gather a stable task list -- trying pidhash\n");
refresh_pidhash_task_table();
return;
}
error(FATAL, "\ncannot gather a stable task list\n");
}
if ((retries == MAX_UNLIMITED_TASK_RETRIES) &&
!(tt->flags & TASK_INIT_DONE))
error(FATAL, "cannot gather a stable task list\n");
/*
* Populate the task_local array with a quick walk-through.
* If there's not enough room in the local array, realloc() it.
*/
ld = &list_data;
BZERO(ld, sizeof(struct list_data));
ld->flags |= RETURN_ON_LIST_ERROR;
ld->start = symbol_value("init_task_union");
ld->member_offset = OFFSET(task_struct_next_task);
if (!hq_open()) {
error(INFO, "cannot hash task_struct entries\n");
if (!(tt->flags & TASK_INIT_DONE))
clean_exit(1);
error(INFO, "using stale task_structs\n");
FREEBUF(tp);
return;
}
if ((cnt = do_list(ld)) < 0) {
retries++;
goto retry;
}
if ((cnt+NR_CPUS+1) > tt->max_tasks) {
tt->max_tasks = cnt + NR_CPUS + TASK_SLUSH;
allocate_task_space(tt->max_tasks);
hq_close();
if (!DUMPFILE())
retries++;
goto retry;
}
BZERO(tt->task_local, tt->max_tasks * sizeof(void *));
cnt = retrieve_list((ulong *)tt->task_local, cnt);
hq_close();
/*
* If SMP, add in the other idle tasks.
*/
if (kt->flags & SMP) {
/*
* Now get the rest of the init_task[] entries, starting
* at offset 1 since we've got the init_task already.
*/
BZERO(&init_tasks[0], sizeof(ulong) * NR_CPUS);
get_idle_threads(&init_tasks[0], kt->cpus);
tlp = (ulong *)tt->task_local;
tlp += cnt;
for (i = 1; i < kt->cpus; i++) {
if (init_tasks[i]) {
*tlp = init_tasks[i];
tlp++;
}
}
}
clear_task_cache();
for (i = 0, tlp = (ulong *)tt->task_local,
tt->running_tasks = 0, tc = tt->context_array;
i < tt->max_tasks; i++, tlp++) {
if (!(*tlp))
continue;
if (!IS_TASK_ADDR(*tlp)) {
error(INFO,
"\ninvalid task address in task list: %lx\n", *tlp);
retries++;
goto retry;
}
if (task_exists(*tlp)) {
error(INFO,
"\nduplicate task address in task list: %lx\n",
*tlp);
retries++;
goto retry;
}
if (!(tp = fill_task_struct(*tlp))) {
if (DUMPFILE())
continue;
retries++;
goto retry;
}
if (store_context(tc, *tlp, tp)) {
tc++;
tt->running_tasks++;
}
}
if (DUMPFILE()) {
fprintf(fp, (pc->flags & SILENT) || !(pc->flags & TTY) ? "" :
"\r \r");
fflush(fp);
}
if (ACTIVE() && (tt->flags & TASK_INIT_DONE))
refresh_context(curtask, curpid);
tt->retries = MAX(tt->retries, retries);
}
/*
* This routine runs one time on dumpfiles, and constantly on live systems.
* It walks through the kernel pidhash array looking for active tasks, and
* populates the local task table with their essential data.
*
* The following manner of refreshing the task table can be used for all
* kernels that have a pidhash[] array, whether or not they still
* have a fixed task[] array or an unlimited list.
*/
static void
refresh_pidhash_task_table(void)
{
int i;
char *pidhash, *tp;
ulong *pp, next, pnext;
int len, cnt;
struct task_context *tc;
ulong curtask;
ulong curpid;
ulong retries;
ulong *tlp;
if (DUMPFILE() && (tt->flags & TASK_INIT_DONE)) /* impossible */
return;
if (DUMPFILE()) { /* impossible */
fprintf(fp, (pc->flags & SILENT) || !(pc->flags & TTY) ?
"" : "\rplease wait... (gathering task table data)");
fflush(fp);
if (!symbol_exists("panic_threads"))
tt->flags |= POPULATE_PANIC;