Identify spinlock holder

Asked Sep 29 '15 at 09:10

Active Sep 29 '15 at 12:10

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Is it possible to find out who (place in code) locked a spinlock? Some file with statistics or so?

More info about my issue: I have a place in code which is trying to obtain a spinlock. The cpu core which runs the kernel thread with spin_lock_irqsave is 100% loaded. I turned on lockup detection in kernel. However I don't get 'BUG: spinlock lockup'. The only info which I get in syslog is 'spinlock waiting more than 120 secs' (I get this from the other threads which are trying to access the spinlock, not from the 100% loaded one).

Thanks Rene

edited Sep 29 '15 at 12:10

asked Sep 29 '15 at 09:10

René Kolařík

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Can you please post the full error? Normally the error looks like this: `BUG: spinlock lockup suspected on CPU#0, sh/11786 [...]` – HelloWorld Sep 29 '15 at 12:18
Here you are: http://pastebin.com/gESRkFvi Thanks! – René Kolařík Sep 29 '15 at 16:37
Enable `CONFIG_DEBUG_LOCKDEP`, also check what instrumentation is already provided by kernel (hint *lib/Kconfig.debug*). – 0andriy Sep 29 '15 at 17:33

Identify spinlock holder

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