Re: [Syzkaller & bisect] There is BUG: unable to handle kernel NULL pointer dereference in xfs_extent_free_diff_items in v6.4-rc3

Pengfei Xu
2023-05-23T06:42:29Z

Hi Bagas Sanjaya,

On 2023-05-23 at 13:08:32 +0700, Bagas Sanjaya wrote:
> On 5/23/23 00:05, Linux regression tracking (Thorsten Leemhuis) wrote:
> > Darrick, sorry for the trouble. Bagas recently out of the blue started
> > to help with adding regressions to the tracking. That's great, but OTOH
> > it means that it's likely time to write a few things up that are obvious
> > to some of us and myself.
> >
> > Bagas, please for the foreseeable future don't add regressions found by
> > syzkaller to the regression tracking, unless some well known developer
> > actually looked into the issue and indicated that it's something that
> > needs to be fixed.
> >
> > Syzbot is great. But it occasionally does odd things or goes of the
> > rails. And in can easily find problems that didn't happen in an earlier
> > version, but are unlikely to be encountered by users in practice (aka
> > "in the wild"). And we normally don't consider those regressions that
> > needs to be fixed.
> >
>
> Oops, at the moment I didn't know how to distinguish true regressions
> and issues found by the bot, so I thought that both are regressions.
>
> Thanks for the tip!
>
The bisect used keyword "xfs_extent_free_diff_items" to bisect, and seems
it's not accurate this time. I will consider improving it.

Thanks!
BR.

> --
> An old man doll... just what I always wanted! - Clara
>