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

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Message-ID: <68cca807.050a0220.28a605.0013.GAE@google.com>
Date: Thu, 18 Sep 2025 17:47:03 -0700
From: syzbot <syzbot+3815dce0acab6c55984e@...kaller.appspotmail.com>
To: 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, oleg@...hat.com, pc@...guebit.org, 
	syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: [syzbot] [netfs?] INFO: task hung in vfs_utimes (3)

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")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection