On Thu, 1 May 2014, Vince Weaver wrote:
> On Thu, 1 May 2014, Peter Zijlstra wrote:
> >
> > But yes please!
>
> OK, sorry for the delay, had forgotten to re-enable -pg for perf in the
> makefile when I applied your patch so had to re-build the kernel.
>
> The trace is here:
> www.eece.maine.edu/~vweaver/junk/pzbug.out.bz2
>
> No analysis so hopefully it's good, I've got an event to go to in a few
> minutes.
>
> The messages:
>
> [ 634.846367] ------------[ cut here ]------------
> [ 634.851477] WARNING: CPU: 6 PID: 2915 at kernel/events/core.c:3232
> __free_event+0x93/0xa0()
So we are on the right track:
perf_fuzzer-2915 [006] 634.846280: bprint: _free_event:
freeing with 0 refs; ptr=0x0xffff8800cef05000
> [ 634.935276] CPU: 6 PID: 2915 Comm: perf_fuzzer Not tainted 3.15.0-rc1+ #94
> [ 634.942754] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS
> 01/26/2014
> [ 634.950728] 0000000000000009 ffff8801174b7b78 ffffffff81649bf0
> 0000000000000000
> [ 634.958795] ffff8801174b7bb0 ffffffff810646ad ffff8800cef05000
> 0000000000000000
----------------------------------------------------^^^^^^^^^^^^^^^^
> [ 634.966855] ffff8800cd47be10 ffff880036c7b388 ffff8800cef052a0
> ffff8801174b7bc0
And the corrupted element:
> [ 635.995839] Slab corruption (Tainted: G W ): kmalloc-2048
> start=ffff8800cef05000, len=2048
The same address.
Heading out now and postponing the chase for tomorrow morning.
Thanks,
tglx
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