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https://github.com/crash-utility/crash
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Implemented a new "bt -c cpu(s)" option to display the backtrace
of the active task on one or more cpus. The cpus must be specified in a comma- and/or dash-separated list; for examples ""3", "1,8,9", "1-23", or "1,8,9-14". Similar to "bt -a", the option is only applicable with crash dumps. (atomlin@redhat.com)
This commit is contained in:
Dave Anderson
parent
3cb7e5a66f
commit
a91e410866
36
help.c
36
help.c
@ -1704,12 +1704,15 @@ NULL
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char *help_bt[] = {
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"bt",
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"backtrace",
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"[-a|-g|-r|-t|-T|-l|-e|-E|-f|-F|-o|-O] [-R ref] [-s [-x|d]] [-I ip] [-S sp]"
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"\n [pid | task]",
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"[-a|-c cpu(s)|-g|-r|-t|-T|-l|-e|-E|-f|-F|-o|-O] [-R ref] [-s [-x|d]]"
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"\n [-I ip] [-S sp] [pid | task]",
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" Display a kernel stack backtrace. If no arguments are given, the stack",
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" trace of the current context will be displayed.\n",
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" -a displays the stack traces of the active task on each CPU.",
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" (only applicable to crash dumps)",
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" -c cpu display the stack trace of the active task on one or more CPUs,",
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" which can be specified using the format \"3\", \"1,8,9\", \"1-23\",",
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" or \"1,8,9-14\". (only applicable to crash dumps)",
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#ifdef GDB_5_3
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" -g use gdb stack trace code. (alpha only)",
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#else
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@ -1785,6 +1788,35 @@ char *help_bt[] = {
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" DS: 002b ESI: bfffc8a0 ES: 002b EDI: 00000000 ",
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" SS: 002b ESP: bfffc82c EBP: bfffd224 ",
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" CS: 0023 EIP: 400d032e ERR: 0000008e EFLAGS: 00000246 ",
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"\n Display the stack trace of the active task on CPU 0 and 1:\n",
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" %s> bt -c 0,1",
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" PID: 0 TASK: ffffffff81a8d020 CPU: 0 COMMAND: \"swapper\"",
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" #0 [ffff880002207e90] crash_nmi_callback at ffffffff8102fee6",
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" #1 [ffff880002207ea0] notifier_call_chain at ffffffff8152d525",
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" #2 [ffff880002207ee0] atomic_notifier_call_chain at ffffffff8152d58a",
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" #3 [ffff880002207ef0] notify_die at ffffffff810a155e",
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" #4 [ffff880002207f20] do_nmi at ffffffff8152b1eb",
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" #5 [ffff880002207f50] nmi at ffffffff8152aab0",
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" [exception RIP: native_safe_halt+0xb]",
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" RIP: ffffffff8103eacb RSP: ffffffff81a01ea8 RFLAGS: 00000296",
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" RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000",
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" RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff81de5228",
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" RBP: ffffffff81a01ea8 R8: 0000000000000000 R9: 0000000000000000",
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" R10: 0012099429a6bea3 R11: 0000000000000000 R12: ffffffff81c066c0",
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" R13: 0000000000000000 R14: ffffffffffffffff R15: ffffffff81de1000",
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" ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018",
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" --- <NMI exception stack> ---",
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" #6 [ffffffff81a01ea8] native_safe_halt at ffffffff8103eacb",
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" #7 [ffffffff81a01eb0] default_idle at ffffffff810167bd",
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" #8 [ffffffff81a01ed0] cpu_idle at ffffffff81009fc6",
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" ",
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" PID: 38 TASK: ffff88003eaae040 CPU: 1 COMMAND: \"khungtaskd\"",
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" #0 [ffff88003ad97ce8] machine_kexec at ffffffff81038f3b",
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" #1 [ffff88003ad97d48] crash_kexec at ffffffff810c5da2",
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" #2 [ffff88003ad97e18] panic at ffffffff8152721a",
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" #3 [ffff88003ad97e98] watchdog at ffffffff810e6346",
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" #4 [ffff88003ad97ee8] kthread at ffffffff8109af06",
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" #5 [ffff88003ad97f48] kernel_thread at ffffffff8100c20a",
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"\n Display the stack traces of task f2814000 and PID 1592:\n",
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" %s> bt f2814000 1592",
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" PID: 1018 TASK: f2814000 CPU: 1 COMMAND: \"java\"",
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47
kernel.c
47
kernel.c
@ -1970,17 +1970,18 @@ void
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cmd_bt(void)
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{
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int i, c;
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ulong value;
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ulong value, *cpus;
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struct task_context *tc;
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int count, subsequent, active;
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int subsequent, active, choose_cpu;
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struct stack_hook hook;
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struct bt_info bt_info, bt_setup, *bt;
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struct reference reference;
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char *refptr;
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ulong tgid;
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ulong tgid, task;
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char arg_buf[BUFSIZE];
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tc = NULL;
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subsequent = active = count = 0;
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subsequent = active = choose_cpu = 0;
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hook.eip = hook.esp = 0;
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refptr = 0;
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bt = &bt_info;
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@ -1989,7 +1990,7 @@ cmd_bt(void)
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if (kt->flags & USE_OLD_BT)
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bt->flags |= BT_OLD_BACK_TRACE;
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while ((c = getopt(argcnt, args, "D:fFI:S:aloreEgstTdxR:O")) != EOF) {
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while ((c = getopt(argcnt, args, "D:fFI:S:c:aloreEgstTdxR:O")) != EOF) {
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switch (c)
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{
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case 'f':
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@ -2132,6 +2133,18 @@ cmd_bt(void)
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"invalid stack address for this task: 0\n");
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break;
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case 'c':
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if (choose_cpu) {
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error(INFO, "only one -c option allowed\n");
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argerrs++;
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} else {
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choose_cpu = 1;
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BZERO(arg_buf, BUFSIZE);
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strncpy(arg_buf, optarg, strlen(optarg));
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cpus = get_cpumask_buf();
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}
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break;
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case 'a':
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active++;
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break;
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@ -2223,6 +2236,30 @@ cmd_bt(void)
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#endif
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}
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if (choose_cpu) {
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if (LIVE())
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error(FATAL,
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"-c option not supported on a live system or live dump\n");
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if (bt->flags & BT_THREAD_GROUP)
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error(FATAL,
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"-c option cannot be used with the -g option\n");
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make_cpumask(arg_buf, cpus, FAULT_ON_ERROR, NULL);
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for (i = 0; i < kt->cpus; i++) {
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if (NUM_IN_BITMAP(cpus, i)) {
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if ((task = get_active_task(i)))
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tc = task_to_context(task);
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else
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error(FATAL, "cannot determine active task on cpu %ld\n", i);
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DO_TASK_BACKTRACE();
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}
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}
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FREEBUF(cpus);
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return;
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}
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if (active) {
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if (LIVE())
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error(FATAL,
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