From: Quentin Perret <qperret@google.com>
To: Valentin Schneider <valentin.schneider@arm.com>
Cc: kernel test robot <lkp@intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Aaron Lu <aaron.lwe@gmail.com>, Phil Auld <pauld@redhat.com>,
Julien Desfossez <jdesfossez@digitalocean.com>,
Nishanth Aravamudan <naravamudan@digitalocean.com>,
LKML <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
lkp@01.org
Subject: Re: [sched] 10e7071b2f: BUG:kernel_NULL_pointer_dereference,address
Date: Thu, 7 Nov 2019 12:15:51 +0000 [thread overview]
Message-ID: <20191107121551.GB82729@google.com> (raw)
In-Reply-To: <20191107120922.GA82729@google.com>
On Thursday 07 Nov 2019 at 12:09:22 (+0000), Quentin Perret wrote:
> sched_move_task() follows what Peter called the 'change' pattern, so I'm
> thinking this is most likely the same issue. Dropping the lock causes an
> unmitigated race between sched_move_task() and pick_next_task_dl(), so
> hilarity ensues (set_next_task() being called twice for instance).
Bah, scratch that. 10e7071b2 is clearly before the pick_next_task()
rework, so that's not it :(
Quentin
next prev parent reply other threads:[~2019-11-07 12:16 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-07 9:08 [sched] 10e7071b2f: BUG:kernel_NULL_pointer_dereference,address kernel test robot
2019-11-07 11:41 ` Valentin Schneider
2019-11-07 12:09 ` Quentin Perret
2019-11-07 12:15 ` Quentin Perret [this message]
2019-11-07 12:37 ` Valentin Schneider
2019-11-07 12:43 ` Quentin Perret
2019-11-07 13:51 ` Valentin Schneider
2019-11-07 14:46 ` Peter Zijlstra
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