Ticketing spinlocks - How to get to the owner who locked the spinlock?

[sanjeev sharma]

Hello

you can try to print running task backtrack information in kernel/lockdep.c

Regards
Sanjeev Sharma

On Tue, Jan 27, 2015 at 11:27 AM, manty kuma <mantykuma at gmail.com> wrote:

> Hi All,
>
> Currently I am looking into an issue which is holding the printk
> lock(logbuf_lock)
>
> logbuf_lock = {
>   raw_lock = {
>     owner = 0,
>     next = 4
>   }
> }
>
> I read about ticketing spinlocks to understand the above output. I
> understood that 4 cpu's are waiting for the lock while someone already has
> it.
>
> I would like to know who has it? Is there a way I can know which process
> is acquiring a given spinlock? Is the information not stored in it?
>
> I am using crash tool to analyse the dump
>
> Regards,
> Manty
>
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