From: Thomas Gleixner <tglx@linutronix.de>
To: David Woodhouse <dwmw2@infradead.org>,
Stefan Hajnoczi <stefanha@redhat.com>,
Jason Wang <jasowang@redhat.com>
Cc: "x86@kernel.org" <x86@kernel.org>, hpa <hpa@zytor.com>,
dyoung <dyoung@redhat.com>, kexec <kexec@lists.infradead.org>,
linux-ext4 <linux-ext4@vger.kernel.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
Stefano Garzarella <sgarzare@redhat.com>,
eperezma <eperezma@redhat.com>,
Paolo Bonzini <bonzini@redhat.com>,
ming.lei@redhat.com, Petr Mladek <pmladek@suse.com>,
John Ogness <jogness@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: Lockdep warnings on kexec (virtio_blk, hrtimers)
Date: Thu, 12 Dec 2024 19:04:55 +0100 [thread overview]
Message-ID: <87a5d0aibc.ffs@tglx> (raw)
In-Reply-To: <10f5d22150b548ec271e0a847ba2eb91139e6f61.camel@infradead.org>
On Thu, Dec 12 2024 at 13:46, David Woodhouse wrote:
> On Thu, 2024-12-12 at 14:34 +0100, Thomas Gleixner wrote:
>>
>> David, can you retest with the debug patch below? That should pin-point
>> the real culprit.
>
> B[ 1.545489] ------------[ cut here ]------------
> [ 1.546338] DEBUG_LOCKS_WARN_ON(suspend_syscore_active)
> [ 1.546375] WARNING: CPU: 0 PID: 18 at kernel/locking/lockdep.c:4471 lockdep_hardirqs_on+0x13a/0x140
Now this starts to be completely mysterious:
> [ 1.571399] finish_task_switch.isra.0+0xc4/0x2d0
> [ 1.572062] __schedule+0x50a/0x1a10
How on earth did this end up in schedule() on the rcu_gp_kthread between
syscore_suspend() and syscore_resume()?
> [ 1.575896] rcu_gp_fqs_loop+0x10b/0x5b0
> [ 1.576455] ? _raw_spin_unlock_irq+0x28/0x50
> [ 1.577072] rcu_gp_kthread+0xf8/0x1b0
> [ 1.577621] kthread+0xd5/0x100
> [ 1.578066] ? __pfx_kthread+0x10/0x10
I tried to reproduce, but failed. Do you have a simple reproducer
recipe?
Thanks,
tglx
next prev parent reply other threads:[~2024-12-12 18:12 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-09 14:28 Lockdep warnings on kexec (virtio_blk, hrtimers) David Woodhouse
2024-12-10 1:56 ` Jason Wang
2024-12-11 12:42 ` Stefan Hajnoczi
2024-12-12 11:07 ` David Woodhouse
2024-12-12 13:34 ` Thomas Gleixner
2024-12-12 13:46 ` David Woodhouse
2024-12-12 18:04 ` Thomas Gleixner [this message]
2024-12-12 19:19 ` David Woodhouse
2024-12-13 0:14 ` Thomas Gleixner
2024-12-13 9:31 ` David Woodhouse
2024-12-13 9:43 ` David Woodhouse
2024-12-13 10:42 ` Thomas Gleixner
2024-12-13 11:09 ` Ming Lei
2024-12-13 11:31 ` Thomas Gleixner
2024-12-13 11:48 ` Ming Lei
2024-12-13 13:23 ` Thomas Gleixner
2024-12-13 14:07 ` David Woodhouse
2024-12-13 17:05 ` Thomas Gleixner
2024-12-13 17:17 ` David Woodhouse
2024-12-13 17:48 ` Rafael J. Wysocki
2024-12-13 17:32 ` Rafael J. Wysocki
2024-12-13 19:06 ` Rafael J. Wysocki
2024-12-13 20:16 ` David Woodhouse
2024-12-14 9:57 ` David Woodhouse
2024-12-16 12:14 ` Rafael J. Wysocki
2024-12-13 17:59 ` Rafael J. Wysocki
2024-12-13 13:17 ` David Woodhouse
2024-12-13 11:12 ` David Woodhouse
2024-12-13 11:33 ` Ming Lei
2024-12-13 11:20 ` Peter Zijlstra
2024-12-13 13:13 ` Thomas Gleixner
2024-12-16 13:20 ` [PATCH] sched: Prevent rescheduling when interrupts are disabled Thomas Gleixner
2024-12-16 17:41 ` David Woodhouse
2024-12-12 11:12 ` Lockdep warnings on kexec (virtio_blk, hrtimers) Ming Lei
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