On Tue, Apr 11, 2023 at 02:10:19PM +0200, Jan Kara wrote: > When we enable MMP in ext4_multi_mount_protect() during mount or > remount, we end up calling sb_start_write() from write_mmp_block(). This > triggers lockdep warning because freeze protection ranks above s_umount > semaphore we are holding during mount / remount. The problem is harmless > because we are guaranteed the filesystem is not frozen during mount / > remount but still let's fix the warning by not grabbing freeze > protection from ext4_multi_mount_protect(). > > Reported-by: syzbot+aacb82fca60873422114@xxxxxxxxxxxxxxxxxxxxxxxxx I believe this is the wrong Reported-by. The correct one looks like it should be: Reported-by: syzbot+6b7df7d5506b32467149@xxxxxxxxxxxxxxxxxxxxxxxxx Link: https://syzkaller.appspot.com/bug?id=ab7e5b6f400b7778d46f01841422e5718fb81843 It's also helpful to add a Link line to the Syzkaller dashboard to make it easier to find the relevant Syzbot report. I'll put this on my todo list to grab for the next batch of ext4 fixups. - Ted
