(cc Roman) On Mon, 06 Jun 2022 10:17:34 -0700 syzbot <syzbot+300d27c79fe6d4cbcc39@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 1cfd968b58a1 Add linux-next specific files for 20220603 > git tree: linux-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=12f7b6b3f00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=7da8386e3742814f > dashboard link: https://syzkaller.appspot.com/bug?extid=300d27c79fe6d4cbcc39 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=103e5177f00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13545057f00000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+300d27c79fe6d4cbcc39@xxxxxxxxxxxxxxxxxxxxxxxxx > > loop0: detected capacity change from 0 to 20 > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 3694 at mm/vmscan.c:681 register_shrinker_prepared+0x119/0x150 mm/vmscan.c:681 That's WARN_ON_ONCE(shrinker_debugfs_add(shrinker)); I assume that debugfs_create_dir() failed. Please see the NOTE: in that function's kerneldoc.
