linux-kernel - Re: [syzbot] [fs?] INFO: task hung in do

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Message-ID: <9bfb10a9-0400-461f-af4d-54946455e74c@gmail.com>
Date: Tue, 8 Jul 2025 09:24:18 +0100
From: Pavel Begunkov <asml.silence@...il.com>
To: syzbot <syzbot+a8cdfe2d8ad35db3a7fd@...kaller.appspotmail.com>,
 anna-maria@...utronix.de, axboe@...nel.dk, brauner@...nel.org,
 frederic@...nel.org, gregkh@...uxfoundation.org, hdanton@...a.com,
 io-uring@...r.kernel.org, jack@...e.cz, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org, luto@...nel.org, peterz@...radead.org,
 syzkaller-bugs@...glegroups.com, tglx@...utronix.de, tj@...nel.org,
 viro@...iv.linux.org.uk
Subject: Re: [syzbot] [fs?] INFO: task hung in do_coredump (3)

On 7/7/25 17:27, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit 2af89abda7d9c2aeb573677e2c498ddb09f8058a
> Author: Pavel Begunkov <asml.silence@...il.com>
> Date:   Thu Aug 24 22:53:32 2023 +0000
> 
>      io_uring: add option to remove SQ indirection

Doesn't look like the cause, the previous repro from 28 Oct 2024 didn't
even have any io_uring, and the patch only reduces sizes of some
allocations. The common part b/w programs is
prctl(PR_SET_SYSCALL_USER_DISPATCH_ON), might be related to that.


> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14ec9582580000
> start commit:   05df91921da6 Merge tag 'v6.16-rc4-smb3-client-fixes' of gi..
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=16ec9582580000
> console output: https://syzkaller.appspot.com/x/log.txt?x=12ec9582580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=45bd916a213c79bb
> dashboard link: https://syzkaller.appspot.com/bug?extid=a8cdfe2d8ad35db3a7fd
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11a2228c580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16d48bd4580000
> 
> Reported-by: syzbot+a8cdfe2d8ad35db3a7fd@...kaller.appspotmail.com
> Fixes: 2af89abda7d9 ("io_uring: add option to remove SQ indirection")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

-- 
Pavel Begunkov