linux-kernel - Re: [syzbot] [exfat?] INFO: task hung in lock_two

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Message-ID: <68b8397c.050a0220.3db4df.01f1.GAE@google.com>
Date: Wed, 03 Sep 2025 05:50:04 -0700
From: syzbot <syzbot+1bfacdf603474cfa86bd@...kaller.appspotmail.com>
To: Yuezhang.Mo@...y.com, adilger.kernel@...ger.ca, bp@...en8.de, 
	brauner@...nel.org, casey@...aufler-ca.com, dave.hansen@...ux.intel.com, 
	hpa@...or.com, jack@...e.cz, linkinjeon@...nel.org, 
	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, mingo@...hat.com, roberto.sassu@...wei.com, 
	sj1557.seo@...sung.com, syzkaller-bugs@...glegroups.com, tglx@...utronix.de, 
	tytso@....edu, viro@...iv.linux.org.uk, x86@...nel.org, yuezhang.mo@...y.com
Subject: Re: [syzbot] [exfat?] INFO: task hung in lock_two_directories (4)

syzbot suspects this issue was fixed by commit:

commit 99f9a97dce39ad413c39b92c90393bbd6778f3fd
Author: Yuezhang Mo <Yuezhang.Mo@...y.com>
Date:   Tue Mar 18 09:00:49 2025 +0000

    exfat: add cluster chain loop check for dir

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13445e62580000
start commit:   3f31a806a62e Merge tag 'mm-hotfixes-stable-2025-07-11-16-1..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=bd2783a0a99d4ed0
dashboard link: https://syzkaller.appspot.com/bug?extid=1bfacdf603474cfa86bd
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=134b50f0580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16d7018c580000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: exfat: add cluster chain loop check for dir

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