linux-kernel - Re: [syzbot] [netfs?] INFO: task hung in vfs

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Message-ID: <20250919071454.GA20615@redhat.com>
Date: Fri, 19 Sep 2025 09:14:54 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: syzbot <syzbot+3815dce0acab6c55984e@...kaller.appspotmail.com>
Cc: brauner@...nel.org, dhowells@...hat.com, jack@...e.cz,
	jlayton@...nel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, netfs@...ts.linux.dev,
	pc@...guebit.org, syzkaller-bugs@...glegroups.com,
	viro@...iv.linux.org.uk
Subject: Re: [syzbot] [netfs?] INFO: task hung in vfs_utimes (3)

On 09/18, syzbot wrote:
>
> syzbot has bisected this issue to:
>
> commit aaec5a95d59615523db03dd53c2052f0a87beea7
> Author: Oleg Nesterov <oleg@...hat.com>
> Date:   Thu Jan 2 14:07:15 2025 +0000
>
>     pipe_read: don't wake up the writer if the pipe is still full
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=175fa534580000
> start commit:   46a51f4f5eda Merge tag 'for-v6.17-rc' of git://git.kernel...
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=14dfa534580000
> console output: https://syzkaller.appspot.com/x/log.txt?x=10dfa534580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8f01d8629880e620
> dashboard link: https://syzkaller.appspot.com/bug?extid=3815dce0acab6c55984e
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17692f62580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1361f47c580000
>
> Reported-by: syzbot+3815dce0acab6c55984e@...kaller.appspotmail.com
> Fixes: aaec5a95d596 ("pipe_read: don't wake up the writer if the pipe is still full")

#syz dup: [syzbot] [fs?] [mm?] INFO: task hung in v9fs_file_fsync

https://lore.kernel.org/all/68a2de8f.050a0220.e29e5.0097.GAE@google.com/