linux-ext4 - Re: INFO: rcu detected stall in ext4_file_write

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Message-ID: <00000000000029b48f05af0ec14f@google.com>
Date:   Fri, 11 Sep 2020 12:33:08 -0700
From:   syzbot <syzbot+7d19c5fe6a3f1161abb7@...kaller.appspotmail.com>
To:     acme@...nel.org, adilger.kernel@...ger.ca, axboe@...nel.dk,
        dvyukov@...gle.com, fweisbec@...il.com, linux-ext4@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        ming.lei@...hat.com, mingo@...nel.org, mingo@...hat.com,
        penguin-kernel@...ove.sakura.ne.jp, peterz@...radead.org,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de, tytso@....edu
Subject: Re: INFO: rcu detected stall in ext4_file_write_iter

syzbot suspects this issue was fixed by commit:

commit 7e24969022cbd61ddc586f14824fc205661bb124
Author: Ming Lei <ming.lei@...hat.com>
Date:   Mon Aug 17 10:00:55 2020 +0000

    block: allow for_each_bvec to support zero len bvec

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1120f201900000
start commit:   92ed3019 Linux 5.8-rc7
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=84f076779e989e69
dashboard link: https://syzkaller.appspot.com/bug?extid=7d19c5fe6a3f1161abb7
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=170f7cbc900000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16a25e38900000

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

#syz fix: block: allow for_each_bvec to support zero len bvec

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