On Thu, May 01, 2014 at 02:35:02PM +0200, Thomas Gleixner wrote: > > grep ptr=0xffff880118fda000 bug.out | less > > > > We find lovely bits such as: > > > > perf_fuzzer-4387 [001] 1773.427175: kmalloc: > > (perf_event_alloc+0x5a) call_site=ffffffff8113a8fa ptr=0xffff880118fda000 > > bytes_req=1272 bytes_alloc=2048 gfp_flags=GFP_KERNEL|GFP_ZERO > > ksoftirqd/6-38 [006] 1773.457770: kfree: > > (free_event_rcu+0x2f) call_site=ffffffff8113177f ptr=0xffff880118fda000 > > <idle>-0 [007] 1774.020378: kfree: > > (free_event_rcu+0x2f) call_site=ffffffff8113177f ptr=0xffff880118fda000 > > perf_fuzzer-4387 [000] 1774.096354: kmalloc: > > (perf_event_alloc+0x5a) call_site=ffffffff8113a8fa ptr=0xffff880118fda000 > > bytes_req=1272 bytes_alloc=2048 gfp_flags=GFP_KERNEL|GFP_ZERO > > > > > > That's almost half a second between the double free, Vince, is your TSC > > solid? > > grep DROPPED bug.out > > Now align that with the double malloc/free sites and you have an explanation > ...
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