Re: [syzbot] [btrfs?] kernel BUG in prepare_to_merge

[Qu Wenruo]

On 2023/7/31 17:46, Christoph Hellwig wrote:
> Thanks.  I've not been able to reproduce it on the apparent bisection
> commit for more than half an hour, but running it on the originally
> reported commit reproduces it after a few minutes.  I'll see if I
> can come up with a better bisection.

I checked the related code, and didn't find anything obvious.

But there is a chance that the image is intentionally corrupted so that
we got a reloc root but incorrect root owner.

Thus I sent out a patch to make that triggering ASSERT() to a more
graceful exit:

https://lore.kernel.org/linux-btrfs/24881cc9caf738f6248232709d7357d3186773b5.1690782754.git.wqu@xxxxxxxx/T/#u

Although I never got the C reproducer to trigger, thus no confirmation
on that.

Thanks,
Qu