linux-kernel - Re: [syzbot] [io-uring?] WARNING: refcount bug in io_send_zc

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Message-ID: <67dec750.050a0220.31a16b.003e.GAE@google.com>
Date: Sat, 22 Mar 2025 07:21:04 -0700
From: syzbot <syzbot+cf285a028ffba71b2ef5@...kaller.appspotmail.com>
To: asml.silence@...il.com, axboe@...nel.dk, io-uring@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [io-uring?] WARNING: refcount bug in io_send_zc_cleanup (2)

syzbot has bisected this issue to:

commit cc34d8330e036b6bffa88db9ea537bae6b03948f
Author: Jens Axboe <axboe@...nel.dk>
Date:   Thu Mar 20 18:25:12 2025 +0000

    io_uring/net: don't clear REQ_F_NEED_CLEANUP unconditionally

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15ef043f980000
start commit:   d07de43e3f05 Merge tag 'io_uring-6.14-20250321' of git://g..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=17ef043f980000
console output: https://syzkaller.appspot.com/x/log.txt?x=13ef043f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=620facf12ff15d10
dashboard link: https://syzkaller.appspot.com/bug?extid=cf285a028ffba71b2ef5
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16be1c4c580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12223004580000

Reported-by: syzbot+cf285a028ffba71b2ef5@...kaller.appspotmail.com
Fixes: cc34d8330e03 ("io_uring/net: don't clear REQ_F_NEED_CLEANUP unconditionally")

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