linux-kernel - Re: de8f5e4f2d ("lockdep: Introduce wait-type checks"): [ 17.344674] EIP: default

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Message-ID: <20200402095812.2t2rgx72n3xy35k2@linutronix.de>
Date:   Thu, 2 Apr 2020 11:58:12 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     kernel test robot <lkp@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
        LKP <lkp@...ts.01.org>
Subject: Re: de8f5e4f2d ("lockdep: Introduce wait-type checks"): [ 17.344674]
 EIP: default_idle

On 2020-04-02 11:40:52 [+0200], Thomas Gleixner wrote:
> kernel test robot <lkp@...el.com> writes:
> > Greetings,
> >
> > 0day kernel testing robot got the below dmesg and the first bad commit is
> >
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> >
> > commit de8f5e4f2dc1f032b46afda0a78cab5456974f89
> > Author:     Peter Zijlstra <peterz@...radead.org>
> > AuthorDate: Sat Mar 21 12:26:01 2020 +0100
> > Commit:     Peter Zijlstra <peterz@...radead.org>
> > CommitDate: Sat Mar 21 16:00:24 2020 +0100
> >
> >     lockdep: Introduce wait-type checks
> 
> Can you please avoid enabling
> 
> > CONFIG_PROVE_RAW_LOCK_NESTING=y
> 
> for now?
> 
> As the changelog states, there are known issues and that's why the
> config is default=n.

There is that. What puzzled me for a little while was the part that the
call chain itself is *valid* and should not trigger this. After staring
at it for a while I noticed that the test was performed *before* the
hrtimer bits were merged.

> Thanks,
> 
>         tglx

Sebastian