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SubjectRe: INFO: rcu detected stall in ext4_file_write_iter
From
syzbot suspects this issue was fixed by commit:

commit 7e24969022cbd61ddc586f14824fc205661bb124
Author: Ming Lei <ming.lei@redhat.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

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