This patch[1] is needed on linux-5.15.y because the panic[2] is also found on linux-5.15.y when debugging bug[3]. Back ported patch[4] is confirmed to fix the bug on linux-5.15.y in the latest test of page[3]. Maybe back port on more branches is needed per patch comments. [1] 2d544ec923dbe5 ("ext4: remove deprecated noacl/nouser_xattr options") [2] https://syzkaller.appspot.com/text?tag=CrashLog&x=171b1077880000 [3] https://syzkaller.appspot.com/bug?id=3613786cb88c93aa1c6a279b1df6a7b201347d08 [4] https://syzkaller.appspot.com/text?tag=Patch&x=1766eb13880000 Regards, Jun