Messages in this thread | | | Date | Mon, 5 May 2014 14:47:32 -0400 (EDT) | From | Vince Weaver <> | Subject | Re: [perf] more perf_fuzzer memory corruption |
| |
On Mon, 5 May 2014, Peter Zijlstra wrote:
> Cute.. does the below cure? > > > --- > Subject: perf: Fix perf_event_init_context() > From: Peter Zijlstra <peterz@infradead.org> > Date: Mon May 5 19:12:20 CEST 2014 > > perf_pin_task_context() can return NULL but perf_event_init_context() > assumes it will not, correct this.
It makes the oops go away, but it does make the fuzzer become unkillable while using 100% CPU.
It looks like it is stuck repeating this forever: perf_fuzzer-5256 [000] 275.943049: kmalloc: (T.1262+0xe) call_site=ffffffff810d022f ptr=0xffff8800cb028400 bytes_req=216 bytes_alloc=256 gfp_flags=GFP_KERNEL|GFP_ZERO perf_fuzzer-5256 [000] 275.943057: function: perf_lock_task_context perf_fuzzer-5256 [000] 275.943057: function: alloc_perf_context and memory is slowly leaking away.
Meanwhile the haswell and AMD machines have been fuzzing away without issue, I don't know why the core2 machine is always the trouble maker.
Vince
| |