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authorDouglas Anderson <dianders@chromium.org>2023-12-20 13:15:37 -0800
committerAndrew Morton <akpm@linux-foundation.org>2023-12-29 12:22:30 -0800
commit55efe4abf927aca3692870a1851067f309e9a374 (patch)
tree775ad663ed3f7958868e0ab7e0cced83926b996c /kernel
parentee6bdb3f4bf046ff7878c6103b8c88bb4ccfb11d (diff)
watchdog: if panicking and we dumped everything, don't re-enable dumping
If, as part of handling a hardlockup or softlockup, we've already dumped all CPUs and we're just about to panic, don't reenable dumping and give some other CPU a chance to hop in there and add some confusing logs right as the panic is happening. Link: https://lkml.kernel.org/r/20231220131534.4.Id3a9c7ec2d7d83e4080da6f8662ba2226b40543f@changeid Signed-off-by: Douglas Anderson <dianders@chromium.org> Cc: John Ogness <john.ogness@linutronix.de> Cc: Lecopzer Chen <lecopzer.chen@mediatek.com> Cc: Li Zhe <lizhe.67@bytedance.com> Cc: Petr Mladek <pmladek@suse.com> Cc: Pingfan Liu <kernelfans@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/watchdog.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 11f9577accca..81a8862295d6 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -192,7 +192,8 @@ void watchdog_hardlockup_check(unsigned int cpu, struct pt_regs *regs)
if (sysctl_hardlockup_all_cpu_backtrace) {
trigger_allbutcpu_cpu_backtrace(cpu);
- clear_bit_unlock(0, &hard_lockup_nmi_warn);
+ if (!hardlockup_panic)
+ clear_bit_unlock(0, &hard_lockup_nmi_warn);
}
if (hardlockup_panic)
@@ -548,7 +549,8 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
if (softlockup_all_cpu_backtrace) {
trigger_allbutcpu_cpu_backtrace(smp_processor_id());
- clear_bit_unlock(0, &soft_lockup_nmi_warn);
+ if (!softlockup_panic)
+ clear_bit_unlock(0, &soft_lockup_nmi_warn);
}
add_taint(TAINT_SOFTLOCKUP, LOCKDEP_STILL_OK);