From 55efe4abf927aca3692870a1851067f309e9a374 Mon Sep 17 00:00:00 2001 From: Douglas Anderson Date: Wed, 20 Dec 2023 13:15:37 -0800 Subject: 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 Cc: John Ogness Cc: Lecopzer Chen Cc: Li Zhe Cc: Petr Mladek Cc: Pingfan Liu Signed-off-by: Andrew Morton --- kernel/watchdog.c | 6 ++++-- 1 file 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); -- cgit