Re: [syzbot] [block?] possible deadlock in blkdev_buffered_write

[syzbot]

syzbot has bisected this issue to:

commit 1b1be9ea4e34ccede1e7cf9ff2b6317328a5b6ad
Author: Julian Sun <sunjunchao@xxxxxxxxxxxxx>
Date:   Thu Oct 15 09:11:05 2026 +0000

    block: take the inode lock for buffered write fallback

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=165121e1580000
start commit:   21a7f44fd076 Merge tag 'devicetree-for-7.4' of git://git.k..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=155121e1580000
console output: https://syzkaller.appspot.com/x/log.txt?x=115121e1580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cb217ea80b9f9fe
dashboard link: https://syzkaller.appspot.com/bug?extid=bd975ef54294bec73f0e
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1634b469580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=108dd695580000

Reported-by: syzbot+bd975ef54294bec73f0e@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 1b1be9ea4e34 ("block: take the inode lock for buffered write fallback")

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