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SubjectRe: KASAN: use-after-free Write in _free_event
On Mon, Jul 9, 2018 at 12:11 PM, Alexander Shishkin
<> wrote:
> syzbot <> writes:
>> Hello,
>> syzbot found the following crash on:
>> HEAD commit: b2d44d145d2a Merge tag '4.18-rc3-smb3fixes' of git://git.s..
>> git tree: upstream
>> console output:
>> kernel config:
>> dashboard link:
>> compiler: gcc (GCC) 8.0.1 20180413 (experimental)
>> Unfortunately, I don't have any reproducer for this crash yet.
> Is there a chance of getting a reproducer for this one?

There is a chance. Frequently syzbot finds a reproducer after some
time. What's the chance in this case I don't know. Since it happened
only once so far, probably not too high.

But there seems to be a good hint in the KASAN report: task was freed
right inside of fork/copy_process, probably some error happened, but
it seems to have been registered in some global list already and
perf_release discovered it there. Does it make sense? Was it
registered? What should have been prevented the task alive at the time
of access?

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