lkml.org 
[lkml]   [2014]   [May]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: perf: use after free in perf_remove_from_context
    On 05/14/2014 12:35 PM, Peter Zijlstra wrote:
    > On Wed, May 14, 2014 at 12:32:26PM -0400, Sasha Levin wrote:
    >> > -----BEGIN PGP SIGNED MESSAGE-----
    >> > Hash: SHA1
    >> >
    >> > On 05/14/2014 12:29 PM, Peter Zijlstra wrote:
    >>> > > On Mon, May 12, 2014 at 11:42:33AM -0400, Sasha Levin wrote:
    >>>> > >> Hi all,
    >>>> > >>
    >>>> > >> While fuzzing with trinity inside a KVM tools guest running the latest -next kernel I've stumbled on the following spew. Maybe related to the very recent change in freeing on task exit?
    >>>> > >>
    >>>> > >> [ 2509.827261] general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC [ 2509.830379] Dumping ftrace buffer: [ 2509.830379] (ftrace buffer empty) [ 2509.830379] Modules linked in: [ 2509.830379] CPU: 47 PID: 43306 Comm: trinity-c126 Tainted: G W 3.15.0-rc5-next-20140512-sasha-00019-ga20bc00-dirty #456
    >>> > >
    >>> > > Any particular trinity setup? And would you happen to have the seed of that run?
    >> >
    >> > Nothing special about trinity options. 400 threads and blacklisting some of the
    >> > destructive syscalls (umount, reboot, etc).
    >> >
    >> > I don't have the seed, but that problem did reproduce again tonight so I can test
    >> > out debug code if you have something in mind.
    > Nah, I drew a pretty big blank, which is why I wanted to see if I could
    > reproduce. If you could share your trinity cmdline I'd be much obliged.
    > While I did manage to clone (the repo moved since last time) and build
    > it, I'm not really that handy with it and want to avoid destroying my
    > machine if possible ;-)

    Anything I could do to help out with this? It reproduces pretty easily on my
    configuration so I'd be happy to test out whatever might help.


    Thanks,
    Sasha


    \
     
     \ /
      Last update: 2014-05-29 02:21    [W:3.372 / U:0.000 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site