linux-kernel - Re: [syzbot] [cgroups?] possible deadlock in cgroup

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Date:   Sun, 19 Nov 2023 16:30:28 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     syzbot <syzbot+cef555184e66963dabc2@...kaller.appspotmail.com>,
        boqun.feng@...il.com, brauner@...nel.org, cgroups@...r.kernel.org,
        hannes@...xchg.org, linux-kernel@...r.kernel.org,
        lizefan.x@...edance.com, longman@...hat.com,
        michael.christie@...cle.com, mingo@...hat.com, mst@...hat.com,
        peterz@...radead.org, syzkaller-bugs@...glegroups.com,
        wander@...hat.com, will@...nel.org
Subject: Re: [syzbot] [cgroups?] possible deadlock in cgroup_free

On 11/19, Tejun Heo wrote:
>
> On Thu, Nov 16, 2023 at 05:25:05PM -0800, syzbot wrote:
> > syzbot has bisected this issue to:
> >
> > commit 2d25a889601d2fbc87ec79b30ea315820f874b78
> > Author: Peter Zijlstra <peterz@...radead.org>
> > Date:   Sun Sep 17 11:24:21 2023 +0000
> >
> >     ptrace: Convert ptrace_attach() to use lock guards
>
> Looks like the tasklist_lock conversion in ptrace_attach() forgot _irq.
> Peter, Oleg?

Yes, please see

	Re: [syzbot] [kernel?] inconsistent lock state in ptrace_attach
	https://lore.kernel.org/all/20231117094531.GN8262@noisy.programming.kicks-ass.net/

Oleg.