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| author |   Ingo Molnar <mingo@kernel.org> | 2024-03-25 11:32:29 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2024-03-25 11:32:29 +0100 |
| commit | f4566a1e73957800df75a3dd2dccee8a4697f327 (patch) | |
| tree | b043b875228c0b25988af66c680d60cae69d761d /lib/dump_stack.c | |
| parent | sched/fair: Fix typos in comments (diff) | |
| parent | Linux 6.9-rc1 (diff) | |
| download | wireguard-linux-f4566a1e73957800df75a3dd2dccee8a4697f327.tar.xz wireguard-linux-f4566a1e73957800df75a3dd2dccee8a4697f327.zip | |
Merge tag 'v6.9-rc1' into sched/core, to pick up fixes and to refresh the branch
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'lib/dump_stack.c')
| -rw-r--r-- | lib/dump_stack.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/lib/dump_stack.c b/lib/dump_stack.c index 83471e81501a..222c6d6c8281 100644 --- a/lib/dump_stack.c +++ b/lib/dump_stack.c @@ -96,15 +96,25 @@ static void __dump_stack(const char *log_lvl) */ asmlinkage __visible void dump_stack_lvl(const char *log_lvl) { + bool in_panic = this_cpu_in_panic(); unsigned long flags; /* * Permit this cpu to perform nested stack dumps while serialising - * against other CPUs + * against other CPUs, unless this CPU is in panic. + * + * When in panic, non-panic CPUs are not permitted to store new + * printk messages so there is no need to synchronize the output. + * This avoids potential deadlock in panic() if another CPU is + * holding and unable to release the printk_cpu_sync. */ - printk_cpu_sync_get_irqsave(flags); + if (!in_panic) + printk_cpu_sync_get_irqsave(flags); + __dump_stack(log_lvl); - printk_cpu_sync_put_irqrestore(flags); + + if (!in_panic) + printk_cpu_sync_put_irqrestore(flags); } EXPORT_SYMBOL(dump_stack_lvl); |