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| author | Eric Sandeen <sandeen@redhat.com> | 2014-12-16 16:25:28 -0600 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-01-14 13:34:14 +0100 |
| commit | a8b686b3af4419f92e0ea5be1c76fb68363df8e6 (patch) | |
| tree | 2c103c51144d8bbcd97e2a02e1ac95ddb224a109 /kernel/sched/core.c | |
| parent | 638476007d13534b2ed4134bf0279ef44071140b (diff) | |
| download | linux-a8b686b3af4419f92e0ea5be1c76fb68363df8e6.tar.gz | |
sched/debug: Check for stack overflow in ___might_sleep()
Sometimes a "BUG: sleeping function called from invalid context" message is not indicative of locking problems, but is the result of a stack overflow corrupting the thread info. Witness http://oss.sgi.com/archives/xfs/2014-02/msg00325.html for example, which took a few go-rounds to sort out. If we're printing the warning, things are wonky already, and it'd be informative to check for the stack end corruption at this point, too. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/5490B158.4060005@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/core.c')
| -rw-r--r-- | kernel/sched/core.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index c0accc00566e..56c9b79772bd 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -7325,6 +7325,9 @@ void ___might_sleep(const char *file, int line, int preempt_offset) in_atomic(), irqs_disabled(), current->pid, current->comm); + if (task_stack_end_corrupted(current)) + printk(KERN_EMERG "Thread overran stack, or stack corrupted\n"); + debug_show_held_locks(current); if (irqs_disabled()) print_irqtrace_events(current); |