[syzbot] [reiserfs?] INFO: task hung in flush_old_commits

[syzbot]

syzbot suspects this issue was fixed by commit:

commit 6f861765464f43a71462d52026fbddfc858239a5
Author: Jan Kara <jack at suse.cz>
Date:   Wed Nov 1 17:43:10 2023 +0000

    fs: Block writes to mounted block devices

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=152ff3f2180000
start commit:   421ca22e3138 Merge tag 'nfs-for-6.4-2' of git://git.linux-..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=7d8067683055e3f5
dashboard link: https://syzkaller.appspot.com/bug?extid=0a684c061589dcc30e51
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14312791280000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12da8605280000

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

#syz fix: fs: Block writes to mounted block devices

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