diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/panic.c | 11 | ||||
| -rw-r--r-- | kernel/sysctl.c | 11 |
2 files changed, 22 insertions, 0 deletions
diff --git a/kernel/panic.c b/kernel/panic.c index 94b5c973770c..85568bbfb12b 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -36,6 +36,14 @@ #define PANIC_TIMER_STEP 100 #define PANIC_BLINK_SPD 18 +#ifdef CONFIG_SMP +/* + * Should we dump all CPUs backtraces in an oops event? + * Defaults to 0, can be changed via sysctl. + */ +unsigned int __read_mostly sysctl_oops_all_cpu_backtrace; +#endif /* CONFIG_SMP */ + int panic_on_oops = CONFIG_PANIC_ON_OOPS_VALUE; static unsigned long tainted_mask = IS_ENABLED(CONFIG_GCC_PLUGIN_RANDSTRUCT) ? (1 << TAINT_RANDSTRUCT) : 0; @@ -522,6 +530,9 @@ void oops_enter(void) /* can't trust the integrity of the kernel anymore: */ debug_locks_off(); do_oops_enter_exit(); + + if (sysctl_oops_all_cpu_backtrace) + trigger_all_cpu_backtrace(); } /* diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 34c1278951b9..f69d581d39c3 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -2150,6 +2150,17 @@ static struct ctl_table kern_table[] = { .proc_handler = proc_dointvec, }, #endif +#ifdef CONFIG_SMP + { + .procname = "oops_all_cpu_backtrace", + .data = &sysctl_oops_all_cpu_backtrace, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = SYSCTL_ZERO, + .extra2 = SYSCTL_ONE, + }, +#endif /* CONFIG_SMP */ { .procname = "pid_max", .data = &pid_max, |