Re: [syzbot] [bcachefs?] UBSAN: shift-out-of-bounds in __btree_node_pinned

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+9f41e4b255897d99d4e9@xxxxxxxxxxxxxxxxxxxxxxxxx
Tested-by: syzbot+9f41e4b255897d99d4e9@xxxxxxxxxxxxxxxxxxxxxxxxx

Tested on:

commit:         51a24b7d Merge tag 'trace-tools-v6.17-rc5' of git://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=165292e2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=229a4110fb045cc6
dashboard link: https://syzkaller.appspot.com/bug?extid=9f41e4b255897d99d4e9
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.