linux-kernel - Re: Possible BT deadlock due to recursive read locking (Was: Re: kernel BUG at kernel/locking/rtmutex.c:1059)

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Message-ID: <20170902092707.1e8800bb@mail.com>
Date:   Sat, 2 Sep 2017 09:27:07 +0200
From:   Mart van de Wege <mvdwege@...l.com> (by way of Mart van de Wege
        <mvdwege@...il.com>)
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...el.com>,
        Gustavo Padovan <gustavo@...ovan.org>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rt-users@...r.kernel.org, tglx@...utronix.de,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: Possible BT deadlock due to recursive read locking (Was: Re:
 kernel BUG at kernel/locking/rtmutex.c:1059)

On Fri, 1 Sep 2017 10:51:07 +0200
Mart van de Wege <mvdwege@...il.com> wrote:

> On Thu, 31 Aug 2017 16:52:12 +0200
> Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:
> 
> > On 2017-08-30 23:25:53 [+0200], Mart van de Wege wrote:  
> > > Hi,    
> > Hi,
> >   
> > > The issue persists up to v4.11.12-rt10    
> > Does
> > 	CONFIG_RWLOCK_RT_READER_BIASED=y
> > make it go away?
> >   
> Yes, that does make it go away. -rt8 now boots cleanly, and works
> fine. Building -rt10 now to be sure.
> 
Confirm that as of 4.11.12-rt11 the deadlock still goes away when
enabling CONFIG_RWLOCK_RT_READER_BIASED

Mart