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

[manty kuma <mantykuma@xxxxxxxxx>]

Thank you Sanjeev,

But as of now i am not sure on how to reproduce the issue. So i have to deal with the dump.

Regards,

Manty

On Tue, Jan 27, 2015 at 3:17 PM, sanjeev sharma <sanjeevsharmaengg@xxxxxxxxx> wrote:

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@xxxxxxxxx> 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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