Re: [syzbot] [fs?] [trace?] WARNING in eventfs_create_events_dir

[Steven Rostedt]

On Fri, 28 Aug 2026 04:27:27 -0700
syzbot <syzbot+3ef80b4ed02226d04a06@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    818bebeb63dd drm/xe: Don't hand out the flat CCS storage a..
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> console output: https://syzkaller.appspot.com/x/log.txt?x=16eddd49580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=ccca94d2c01b9e78
> dashboard link: https://syzkaller.appspot.com/bug?extid=3ef80b4ed02226d04a06
> compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17986d79580000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+3ef80b4ed02226d04a06@xxxxxxxxxxxxxxxxxxxxxxxxx
> 
> R10: 0000000000000000 R11: 0000000000000202 R12: 00007fae2ca35a9f
> R13: 00007fae2ca35adb R14: 00007fae2ca5ccc0 R15: 0000000000000002
>  </TASK>
> ------------[ cut here ]------------
> !list_empty(&ei->children)
> WARNING: fs/tracefs/event_inode.c:128 at free_ei fs/tracefs/event_inode.c:128 [inline], CPU#0: syz-executor340/6037
> WARNING: fs/tracefs/event_inode.c:128 at cleanup_ei fs/tracefs/event_inode.c:150 [inline], CPU#0: syz-executor340/6037
> WARNING: fs/tracefs/event_inode.c:128 at cleanup_ei fs/tracefs/event_inode.c:145 [inline], CPU#0: syz-executor340/6037
> WARNING: fs/tracefs/event_inode.c:128 at eventfs_create_events_dir+0xa3d/0xbe0 fs/tracefs/event_inode.c:838, CPU#0: syz-executor340/6037

This should be fixed by: https://lore.kernel.org/all/20260827151011.389282397@xxxxxxxxxx/

Which is in my queue to send to Linus (and currently in my "fixes" branch).
I have some more patches to process before I send Linus my pull request.

-- Steve