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

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Message-ID: <ZVolxA8RHsY11CnE@slm.duckdns.org>
Date:   Sun, 19 Nov 2023 05:12:04 -1000
From:   Tejun Heo <tj@...nel.org>
To:     syzbot <syzbot+cef555184e66963dabc2@...kaller.appspotmail.com>
Cc:     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,
        oleg@...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 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?

Thanks.

-- 
tejun