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From: Mike Galbraith <efault@gmx.de>
To: Vlastimil Babka <vbabka@suse.cz>,
	Thomas Gleixner <tglx@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>
Cc: linux-rt-users@vger.kernel.org,
	Mel Gorman <mgorman@techsingularity.net>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: Re: [rfc/patch] mm/slub: restore/expand unfreeze_partials() local exclusion scope
Date: Tue, 20 Jul 2021 13:26:14 +0200	[thread overview]
Message-ID: <f16b78bd3bb8fecf734017d40274e4c3294554ab.camel@gmx.de> (raw)
In-Reply-To: <f9935c4c-078c-4b52-5297-64ee22272664@suse.cz>

On Tue, 2021-07-20 at 10:56 +0200, Vlastimil Babka wrote:
>
> > crash> bt -sx
> > PID: 18761  TASK: ffff88812fff0000  CPU: 0   COMMAND: "hackbench"
> >  #0 [ffff88818f8ff980] machine_kexec+0x14f at ffffffff81051c8f
> >  #1 [ffff88818f8ff9c8] __crash_kexec+0xd2 at ffffffff8111ef72
> >  #2 [ffff88818f8ffa88] crash_kexec+0x30 at ffffffff8111fd10
> >  #3 [ffff88818f8ffa98] oops_end+0xd3 at ffffffff810267e3
> >  #4 [ffff88818f8ffab8] exc_general_protection+0x195 at ffffffff8179fdb5
> >  #5 [ffff88818f8ffb50] asm_exc_general_protection+0x1e at ffffffff81800a0e
> >     [exception RIP: __unfreeze_partials+156]
>
> Hm going back to this report...

> So could it be that it was stillput_cpu_partial() preempting
> __slab_alloc() messing the partial list, but for some reason the
> put_cpu_partial() side crashed this time?

Thinking this bug is toast, I emptied the trash bin, so no can peek.

If need be, and nobody beats me to it (which ~guarantees nobody will
beat me to it;), I can make the thing go boom again easily enough.

	-Mike


  reply	other threads:[~2021-07-20 11:26 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-08  9:42 [ANNOUNCE] v5.13-rt1 Thomas Gleixner
2021-07-09  5:20 ` [patch] mm/slub: Fix kmem_cache_alloc_bulk() error path Mike Galbraith
2021-07-09  5:20 ` [patch] mm/slub: Replace do_slab_free() local_lock_irqsave/restore() calls in PREEMPT_RT scope Mike Galbraith
2021-07-09  5:21 ` [rfc/patch] mm/slub: restore/expand unfreeze_partials() local exclusion scope Mike Galbraith
2021-07-09  5:25   ` Mike Galbraith
2021-07-09 19:28   ` Thomas Gleixner
2021-07-10  1:12     ` Mike Galbraith
2021-07-15 16:34       ` Mike Galbraith
2021-07-17 14:58         ` [patch] v2 " Mike Galbraith
2021-07-18  7:58           ` Vlastimil Babka
2021-07-18  8:11             ` Mike Galbraith
2021-07-18 15:43           ` Mike Galbraith
2021-07-18 21:19           ` Vlastimil Babka
2021-07-19  4:01             ` Mike Galbraith
2021-07-19 13:15               ` Mike Galbraith
2021-07-20  2:46           ` kernel test robot
2021-07-20  2:46             ` kernel test robot
2021-07-20  8:56         ` [rfc/patch] " Vlastimil Babka
2021-07-20 11:26           ` Mike Galbraith [this message]
2021-07-21  4:56             ` Mike Galbraith
2021-07-21  8:44               ` Vlastimil Babka
2021-07-21  9:33                 ` Mike Galbraith
2021-07-23 22:39                   ` Vlastimil Babka
2021-07-24  2:25                     ` Mike Galbraith
2021-07-25 14:09                     ` Mike Galbraith
2021-07-25 14:16                       ` Vlastimil Babka
2021-07-25 15:02                         ` Mike Galbraith
2021-07-25 16:27                           ` Vlastimil Babka
2021-07-25 19:12                             ` Vlastimil Babka
2021-07-25 19:34                               ` Vlastimil Babka
2021-07-26 10:04                                 ` Mike Galbraith
2021-07-26 17:00                                 ` Mike Galbraith
2021-07-26 21:26                                   ` Vlastimil Babka
2021-07-27  4:09                                     ` Mike Galbraith
2021-07-28 16:59                                       ` Vlastimil Babka
2021-07-29  4:51                                         ` Mike Galbraith
2021-07-29  9:51                                           ` Vlastimil Babka

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