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Date: Tue, 24 Jan 2017 14:49:18 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Dmitry Vyukov <dvyukov@...gle.com> Cc: Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, LKML <linux-kernel@...r.kernel.org>, syzkaller <syzkaller@...glegroups.com> Subject: Re: perf: use-after-free in perf_event_for_each On Tue, Jan 24, 2017 at 02:29:19PM +0100, Dmitry Vyukov wrote: > > Try to run more parallel processes at the same time. > This program will run 32 processes in a tight loop: > https://gist.githubusercontent.com/dvyukov/b36aa4398bb016923278fccdd1cc5b45/raw/9607078fd5ac2daf769c13d82561a83e17b06032/gistfile1.txt > It triggered the UAF in several minutes for me. I have 4 CPUs in the > VM. If you have more, set number of processes to 8*CPU. No VM here, I'll up to 320 processes.
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