Re: BUG: unable to handle kernel paging request in rb_erase

[J. Bruce Fields]

On Fri, Jun 26, 2020 at 12:32:42PM +0200, Dmitry Vyukov wrote:
> So far this crash happened only once:
> https://syzkaller.appspot.com/bug?extid=0e37e9d19bded16b8ab9
> 
> For continuous fuzzing on syzbot it usually means either (1) it's a
> super narrow race or (2) it's a previous unnoticed memory corruption.
> 
> Simpler bugs usually have much higher hit counts:
> https://syzkaller.appspot.com/upstream
> https://syzkaller.appspot.com/upstream/fixed
> 
> If you did a reasonable looking for any obvious bugs in the code that
> would lead to such failure, it can make sense to postpone any
> additional actions until we have more info.
> If no info comes, at some point syzbot will auto-obsolete it, and then
> then we can assume it was (2).

OK, thanks.

It's a big heavily used data structure, if there was random memory
corruption then I guess this wouldn't be a surprising way for it to show
up.

--b.