On Thu, Dec 17, 2015 at 03:08:49PM +0100, Dmitry Vyukov wrote:
> On Thu, Dec 17, 2015 at 3:06 PM, Peter Zijlstra <pet...@infradead.org> wrote:
> > On Thu, Dec 10, 2015 at 08:57:40PM +0100, Peter Zijlstra 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?
This is the thread about the difficult to deterministically reproduce
use-after-free.
> I have CONFIG_HOTPLUG enabled, but I don't do actual hotplug (well,
> actually I don't know how to do hotplug, but I still think I am not
> doing it).
You can do hotplug like:
echo 0 > /sys/devices/system/cpu/cpu1/online
echo 1 > /sys/devices/system/cpu/cpu1/online
so if syzkaller doesn't know about that, and I suppose you not
knowing this means syzkaller doesn't either, this isn't happening.
Thanks, that disqualifies a bunch of code.
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