Re: [BUG] WARNING in io_ring_exit_work (io_uring.c:2187) via IORING_REGISTER_BPF_FILTER — confirmed on 7.0-rc5 and rc6

[Jens Axboe]

On 3/31/26 7:32 AM, antonius wrote:
> Hello,
> 
> I am reporting a kernel WARNING discovered via Syzkaller fuzzing of Linux
> 7.0-rc5, targeting the new IORING_REGISTER_BPF_FILTER subsystem (new in 7.0).
> 
> The bug is confirmed on both 7.0-rc5 and 7.0-rc6. It is NOT fixed in rc6.
> In rc6, the WARNING appears to have changed from WARN_ON to WARN_ON_ONCE
> (fires only once per boot), which may explain why it was initially missed.

Interesting, that's why I added those WARN_ON's. I'll take a look
at this.

And yes, they would only fire once, because are WARN_ON_ONCE()...


-- 
Jens Axboe