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SubjectRe: kernel BUG in ext4_free_blocks (2)
On Fri, Dec 16, 2022 at 2:01 PM Lee Jones <> wrote:
> On Thu, 15 Dec 2022, Theodore Ts'o wrote:
> > On Thu, Dec 15, 2022 at 08:34:35AM -0800, syzbot wrote:
> > > This bug is marked as fixed by commit:
> > > ext4: block range must be validated before use in ext4_mb_clear_bb()
> > > But I can't find it in any tested tree for more than 90 days.
> > > Is it a correct commit? Please update it by replying:
> > > #syz fix: exact-commit-title
> > > Until then the bug is still considered open and
> > > new crashes with the same signature are ignored.
> >
> > I don't know what is going on with syzkaller's commit detection, but
> > commit 1e1c2b86ef86 ("ext4: block range must be validated before use
> > in ext4_mb_clear_bb()") is an exact match for the commit title, and
> > it's been in the upstream kernel since v6.0.
> >
> > How do we make syzkaller accept this? I'll try this again, but I
> > don't hold out much hope.
> I don't see the original bug report (was it posted to a lore
> associated list?), so there is no way to tell what branch syzbot was
> fuzzing at the time. My assumption is that it was !Mainline.

Syzbot is actually reacting here to this bug from the Android namespace:

> Although this does appear to be a Stable candidate, I do not see it
> in any of the Stable branches yet. So I suspect the answer here is to
> wait for the fix to filter down.
> In the mean time, I guess we should discuss whether syzbot should
> really be posting scans of downstream trees to upstream lists.

In this particular case, syzbot has captured all the recipients from
the patch email [1], because that email Cc'd To syzbot, all
these people were involved in the original bug discussion, and so it
notified them about the problem.

FWIW I've sent a PR[2] to make the "I can't find it in any tested
tree" message include the link to the syzkaller dashboard. Hopefully
it will help resolve such confusions faster.



> > #syz fix: ext4: block range must be validated before use in ext4_mb_clear_bb()
> >
> > Syzkaller, go home, you're drunk.
> =:-)
> --
> Lee Jones [李琼斯]
> --
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