linux-kernel - Re: perf: fuzzer getting stuck with slow memory leak

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Date:	Tue, 27 May 2014 14:02:30 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Vince Weaver <vincent.weaver@...ne.edu>
cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: perf: fuzzer getting stuck with slow memory leak

On Tue, 27 May 2014, Vince Weaver wrote:

> Not a useful trace though, due to the dreaded EVENTS_DROPPED 
> happening right when things would be interesting.
> 
> CPU:0 [148307 EVENTS DROPPED]
>      perf_fuzzer-2940  [000]   396.172211: kmalloc:              (T.1267+0xe) call_site=ffffffff810d027d ptr=0xffff8800be516b00 bytes_req=216 bytes_alloc=256 gfp_flags=GFP_KERNEL|GFP_ZERO
>      perf_fuzzer-2940  [000]   396.172211: function:             perf_lock_task_context
>      perf_fuzzer-2940  [000]   396.172211: function:             alloc_perf_context

for what it's worth the even that seems to trigger this is a 
SW_EMULATION_FAULTS event.  Odd.

     perf_fuzzer-2989  [001]  1994.514398: sys_enter:		NR 298 (699f28, bad, 0, ffffffff, 2, 7fff361a3360)
     perf_fuzzer-2989  [001]  1994.514399: bprint:		SYSC_perf_event_open: VMW: perf_event_open type=1 config=8 period=0 pid=2989 cpu=0 group=-1 flags=2
     perf_fuzzer-2989  [001]  1994.514400: kmalloc:		(T.1267+0xe) call_site=ffffffff810d027d ptr=0xffff880119d1f400 bytes_req=936 bytes_alloc=1024 gfp_flags=GFP_KERNEL|GFP_ZERO
     perf_fuzzer-2989  [001]  1994.514401: kmalloc:		(T.1267+0xe) call_site=ffffffff810d027d ptr=0xffff8800cbbbd000 bytes_req=2064 bytes_alloc=4096 gfp_flags=GFP_KERNEL|GFP_ZERO
     perf_fuzzer-2989  [001]  1994.514401: kmalloc:     	(T.1267+0xe) call_site=ffffffff810d027d ptr=0xffff880119fcd000 bytes_req=2064 bytes_alloc=4096 gfp_flags=GFP_KERNEL|GFP_ZERO
     perf_fuzzer-2989  [001]  1994.514402: kmalloc:		(T.1267+0xe) call_site=ffffffff810d027d ptr=0xffff8800c9344400 bytes_req=216 bytes_alloc=256 gfp_flags=GFP_KERNEL|GFP_ZERO
	(repeat forever)

Vince
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