On Thu, Dec 17, 2015 at 3:28 PM, Peter Zijlstra <pet...@infradead.org> wrote:
>> > >> I'm not sure I can explain your problem with this, but I figure its
>> > >> worth a try.
>> > >
>> > > Did it make a difference?
>> > >
>> > > Also, does the syzkaller thing do cpu-hotplug during its runs?
>> >
>> > See my email on Dec 15.
>>
>> I have 4 emails from you on that day (and one private), they pertain to
>> getting stuck in perf_{install,remove}_from_context(). None of those
>> emails seem to contain an answer to either of the two above questions.
>>
>> cact4y+za4l4q6fzlxjygbnsyrwa7rjzycg_s562q+crny9c...@mail.gmail.com
>> cact4y+yukygcuqfw6ebttdfrqdf7eetrb3vayjk+luxe_-i...@mail.gmail.com
>> CACT4Y+bvHWuyDZjoFhLAOiK1rfNQcfuSJCY0oS5xA=u8j04...@mail.gmail.com
>> cact4y+an67kntsvvzyvvrykw9yg7pbduc8wyb38piwrost0...@mail.gmail.com
>>
>> and in private:
>>
>> cact4y+zb1vu192jbcnys9qy3cpsvfaujdpbvusmosuectqj...@mail.gmail.com
>>
>> Did I miss an email?
>
> Yes, I seem to have missed this one:
>
> cact4y+y_yded-ygdwq-wqv6s+1m2nka6atyo2dofa8-wtq8...@mail.gmail.com
>
> found it, thanks!
Yes, that one.
In short, I did not see use-after-frees but perf_event_open fuzzing
started hanging VMs very frequently, so testing is inconclusive.
And, no, nobody touches anything in /sys/devices.
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