From: Oleg Nesterov <oleg@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
linux-rt-users <linux-rt-users@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
Clark Williams <williams@redhat.com>,
Juri Lelli <juri.lelli@redhat.com>,
jack@suse.com
Subject: Re: [RT WARNING] DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current) with fsfreeze (4.19.25-rt16)
Date: Tue, 30 Apr 2019 16:42:53 +0200 [thread overview]
Message-ID: <20190430144252.GF23020@redhat.com> (raw)
In-Reply-To: <20190430141500.GE23020@redhat.com>
I have cloned linux-rt-devel.git
If I understand correctly, in rt rw_semaphore is actually defined in rwsem_rt.h
so percpu_rwsem_acquire() should probably do
sem->rw_sem.rtmutex.owner = current;
?
On 04/30, Oleg Nesterov wrote:
>
> Sorry, I don't understand...
>
> On 04/30, Peter Zijlstra wrote:
> >
> > Thaw then does the reverse, frobs lockdep
>
> Yes, in particular it does
>
> lockdep_sb_freeze_acquire()
> percpu_rwsem_acquire()
> sem->rw_sem.owner = current;
>
>
> > and then does: percpu_up_write().
> >
> > percpu_up_write() on up_write(). And note how __up_write() has:
> >
> > DEBUG_RWSEMS_WARN_ON(sem->owner != current, sem);
>
> and everything looks correct, sem->owner == current by the time
> thaw_super_locked() does percpu_up_write/up_write.
>
> Oleg.
next prev parent reply other threads:[~2019-04-30 14:43 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-26 9:34 [RT WARNING] DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current) with fsfreeze (4.19.25-rt16) Juri Lelli
2019-03-28 10:17 ` Sebastian Andrzej Siewior
2019-04-19 8:56 ` Juri Lelli
2019-04-30 12:51 ` Sebastian Andrzej Siewior
2019-04-30 13:28 ` Peter Zijlstra
2019-04-30 13:45 ` Sebastian Andrzej Siewior
2019-04-30 14:01 ` Peter Zijlstra
2019-04-30 14:15 ` Oleg Nesterov
2019-04-30 14:29 ` Peter Zijlstra
2019-04-30 14:42 ` Oleg Nesterov [this message]
2019-04-30 14:44 ` Peter Zijlstra
2019-04-30 14:53 ` Oleg Nesterov
2019-05-01 17:09 ` Peter Zijlstra
2019-05-01 17:26 ` Waiman Long
2019-05-01 18:54 ` Peter Zijlstra
2019-05-01 19:22 ` Davidlohr Bueso
2019-05-01 19:25 ` Peter Zijlstra
2019-05-02 10:09 ` Oleg Nesterov
2019-05-02 11:42 ` Oleg Nesterov
2019-05-03 14:50 ` Peter Zijlstra
2019-05-03 15:25 ` Peter Zijlstra
2019-05-06 16:50 ` Oleg Nesterov
2019-06-19 9:50 ` Peter Zijlstra
2019-05-03 14:16 ` Peter Zijlstra
2019-05-03 15:37 ` Oleg Nesterov
2019-05-03 15:46 ` Peter Zijlstra
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