From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Mike Galbraith <efault@gmx.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>,
linux-rt-users <linux-rt-users@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: ltp or kvm triggerable lockdep alloc_pid() deadlock gripe
Date: Thu, 22 Oct 2020 18:44:13 +0200 [thread overview]
Message-ID: <20201022164413.tnchtyqbotvbnp2e@linutronix.de> (raw)
In-Reply-To: <1236de05e704f0a0b28dc0ad75f9ad4d81b7a057.camel@gmx.de>
On 2020-10-22 07:21:13 [+0200], Mike Galbraith wrote:
> Greetings,
Hi,
> The gripe below is repeatable in two ways here, boot with nomodeset so
> nouveau doesn't steal the lockdep show when I then fire up one of my
> (oink) full distro VM's, or from an ltp directory ./runltp -f cpuset
> with the attached subset of controllers file placed in ./runtest dir.
>
> Method2 may lead to a real deal deadlock, I've got a crashdump of one,
> stack traces of uninterruptible sleepers attached.
Just added commit
267580db047ef ("seqlock: Unbreak lockdep")
and it is gone.
Sebastian
next prev parent reply other threads:[~2020-10-22 16:44 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-21 12:53 [ANNOUNCE] v5.9.1-rt18 Sebastian Andrzej Siewior
2020-10-21 13:14 ` Sebastian Andrzej Siewior
2020-10-27 6:53 ` Fernando Lopez-Lezcano
2020-10-27 8:22 ` Sebastian Andrzej Siewior
2020-10-27 17:07 ` Fernando Lopez-Lezcano
2020-10-28 20:24 ` Sebastian Andrzej Siewior
2020-10-22 5:21 ` ltp or kvm triggerable lockdep alloc_pid() deadlock gripe Mike Galbraith
2020-10-22 16:44 ` Sebastian Andrzej Siewior [this message]
2020-10-22 5:28 ` kvm+nouveau induced lockdep gripe Mike Galbraith
2020-10-23 9:01 ` Sebastian Andrzej Siewior
2020-10-23 12:07 ` Mike Galbraith
[not found] ` <20201024022236.19608-1-hdanton@sina.com>
2020-10-24 3:38 ` Mike Galbraith
[not found] ` <20201024050000.8104-1-hdanton@sina.com>
2020-10-24 5:25 ` Mike Galbraith
[not found] ` <20201024094224.2804-1-hdanton@sina.com>
2020-10-26 17:26 ` Sebastian Andrzej Siewior
2020-10-26 17:31 ` Sebastian Andrzej Siewior
2020-10-26 19:15 ` Mike Galbraith
2020-10-26 19:53 ` Sebastian Andrzej Siewior
2020-10-27 6:03 ` Mike Galbraith
2020-10-27 9:00 ` Sebastian Andrzej Siewior
2020-10-27 9:49 ` Mike Galbraith
2020-10-27 10:14 ` Mike Galbraith
2020-10-27 10:18 ` Sebastian Andrzej Siewior
2020-10-27 11:13 ` Mike Galbraith
2021-09-17 13:17 ` [tip: irq/core] genirq: Move prio assignment into the newly created thread tip-bot2 for Thomas Gleixner
2021-09-17 13:17 ` [tip: sched/core] kthread: Move prio/affinite change " tip-bot2 for Sebastian Andrzej Siewior
2021-09-17 18:36 ` tip-bot2 for Sebastian Andrzej Siewior
2021-10-05 14:12 ` tip-bot2 for Sebastian Andrzej Siewior
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