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Re: perf: perf_fuzzer lockup in perf_cgroup_attach

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On Thu, 15 Sep 2016, Peter Zijlstra wrote:

> On Wed, Sep 14, 2016 at 10:43:29PM -0400, Vince Weaver wrote:
> > 
> > so the skylake that was fuzzing finally is mostly locked up.
> > 
> > Really hard to tell what's going, especially as KASLR made looking up the 
> > addresses a big pain.
> > 
> > The best I can tell things are getting wedged somehow in 
> > perf_cgroup_switch() while interrupts are disabled.  Interrupts are never 
> > getting re-enabled, causing the RCU and NMI watchdogs to trigger (and more 
> > alarming things like the SATA bus resetting).
> 
> How do you go about using cgroups? Do you set them up yourself, does the
> fuzzer do so?

that's an interesting thing, I don't think the fuzzer actually sets up any 
cgroups.  It will try creating events with PERF_FLAG_PID_CGROUP but it 
will just use a random number as the cgroup fd.  

I know at one time I meant to do more interesting things with cgroups
but if I recall it wasn't really possible without running as root and I 
usually don't fuzz as root.

Vince

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perf: perf_fuzzer lockup in perf_cgroup_attach Vince Weaver <vincent.weaver@maine.edu> - 2016-09-15 04:50 +0200
  Re: perf: perf_fuzzer lockup in perf_cgroup_attach Stephane Eranian <eranian@google.com> - 2016-09-15 07:40 +0200
    Re: perf: perf_fuzzer lockup in perf_cgroup_attach Peter Zijlstra <peterz@infradead.org> - 2016-09-15 09:30 +0200
      Re: perf: perf_fuzzer lockup in perf_cgroup_attach Josh Poimboeuf <jpoimboe@redhat.com> - 2016-09-15 14:20 +0200
        [PATCH] scripts: add script for translating stack dump function  offsets Josh Poimboeuf <jpoimboe@redhat.com> - 2016-09-16 16:50 +0200
          Re: [PATCH] scripts: add script for translating stack dump function offsets Linus Torvalds <torvalds@linux-foundation.org> - 2016-09-16 20:20 +0200
            Re: [PATCH] scripts: add script for translating stack dump function  offsets Josh Poimboeuf <jpoimboe@redhat.com> - 2016-09-16 21:20 +0200
              Re: [PATCH] scripts: add script for translating stack dump function offsets Linus Torvalds <torvalds@linux-foundation.org> - 2016-09-16 21:30 +0200
                [PATCH v2] scripts: add script for translating stack dump function  offsets Josh Poimboeuf <jpoimboe@redhat.com> - 2016-09-16 23:30 +0200
                Re: [PATCH v2] scripts: add script for translating stack dump  function offsets Linus Torvalds <torvalds@linux-foundation.org> - 2016-09-17 02:10 +0200
                Re: [PATCH v2] scripts: add script for translating stack dump  function offsets Josh Poimboeuf <jpoimboe@redhat.com> - 2016-09-17 02:50 +0200
                Re: [PATCH v2] scripts: add script for translating stack dump  function offsets Linus Torvalds <torvalds@linux-foundation.org> - 2016-09-17 04:00 +0200
                Re: [PATCH v2] scripts: add script for translating stack dump  function offsets Linus Torvalds <torvalds@linux-foundation.org> - 2016-09-17 04:40 +0200
                Re: [PATCH v2] scripts: add script for translating stack dump  function offsets Josh Poimboeuf <jpoimboe@redhat.com> - 2016-09-17 20:50 +0200
                [PATCH v3] scripts: add script for translating stack dump function Josh Poimboeuf <jpoimboe@redhat.com> - 2016-09-19 18:00 +0200
                Re: [PATCH v3] scripts: add script for translating stack dump function Linus Torvalds <torvalds@linux-foundation.org> - 2016-09-19 21:00 +0200
                Re: [PATCH v3] scripts: add script for translating stack dump function Linus Torvalds <torvalds@linux-foundation.org> - 2016-09-19 21:20 +0200
                Re: [PATCH v3] scripts: add script for translating stack dump  function Josh Poimboeuf <jpoimboe@redhat.com> - 2016-09-19 21:30 +0200
                Re: [PATCH v3] scripts: add script for translating stack dump  function Rabin Vincent <rabin@rab.in> - 2016-09-19 22:10 +0200
                Re: [PATCH v3] scripts: add script for translating stack dump function Linus Torvalds <torvalds@linux-foundation.org> - 2016-09-19 22:30 +0200
                Re: [PATCH v3] scripts: add script for translating stack dump  function Josh Poimboeuf <jpoimboe@redhat.com> - 2016-09-19 23:00 +0200
                Re: [PATCH v3] scripts: add script for translating stack dump  function Josh Poimboeuf <jpoimboe@redhat.com> - 2016-09-19 23:10 +0200
                Re: [PATCH v3] scripts: add script for translating stack dump function Linus Torvalds <torvalds@linux-foundation.org> - 2016-09-19 23:10 +0200
                Re: [PATCH v2] scripts: add script for translating stack dump  function offsets Peter Zijlstra <peterz@infradead.org> - 2016-09-17 03:30 +0200
                Re: [PATCH v2] scripts: add script for translating stack dump  function offsets Rabin Vincent <rabin@rab.in> - 2016-09-17 10:20 +0200
                Re: [PATCH v2] scripts: add script for translating stack dump  function offsets Josh Poimboeuf <jpoimboe@redhat.com> - 2016-09-17 20:50 +0200
              Re: [PATCH] scripts: add script for translating stack dump function offsets Vegard Nossum <vegard.nossum@gmail.com> - 2016-09-17 11:20 +0200
                Re: [PATCH] scripts: add script for translating stack dump function  offsets Josh Poimboeuf <jpoimboe@redhat.com> - 2016-09-17 21:00 +0200
    Re: perf: perf_fuzzer lockup in perf_cgroup_attach Vince Weaver <vincent.weaver@maine.edu> - 2016-09-15 14:50 +0200
  Re: perf: perf_fuzzer lockup in perf_cgroup_attach Peter Zijlstra <peterz@infradead.org> - 2016-09-15 09:20 +0200
    Re: perf: perf_fuzzer lockup in perf_cgroup_attach Vince Weaver <vincent.weaver@maine.edu> - 2016-09-15 14:50 +0200

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