Re: [syzbot] [fs?] INFO: task hung in do_coredump (3)

[Pavel Begunkov]

On 7/7/25 17:27, syzbot wrote:
> syzbot has bisected this issue to:
>
> commit 2af89abda7d9c2aeb573677e2c498ddb09f8058a
> Author: Pavel Begunkov <asml.silence@xxxxxxxxx>
> 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@xxxxxxxxxxxxxxxxxxxxxxxxx
> Fixes: 2af89abda7d9 ("io_uring: add option to remove SQ indirection")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

--
Pavel Begunkov