Re: [syzbot] [bpf?] WARNING: locking bug in trie_delete_elem

[Thomas Gleixner]

On Thu, Nov 07 2024 at 13:00, syzbot wrote:
> syzbot has bisected this issue to:
>
> commit 4febce44cfebcb490b196d5d10ae9f403ca4c956
> Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Date:   Tue Oct 1 08:42:03 2024 +0000
>
>     posix-timers: Cure si_sys_private race
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=129f2d87980000
> start commit:   f9f24ca362a4 Add linux-next specific files for 20241031
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=169f2d87980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=328572ed4d152be9
> dashboard link: https://syzkaller.appspot.com/bug?extid=b506de56cbbb63148c33
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1387655f980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11ac5540580000
>
> Reported-by: syzbot+b506de56cbbb63148c33@xxxxxxxxxxxxxxxxxxxxxxxxx
> Fixes: 4febce44cfeb ("posix-timers: Cure si_sys_private race")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

I seriously doubt that this bisection is even remotely correct.

This commit has absolutely nothing to do with the lockdep splat and
trie_delete_elem().

Thanks,

        tglx