From: Vince Weaver <vincent.weaver@maine.edu>
To: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Cc: lkml <linux-kernel@vger.kernel.org>, Jiri Olsa <jolsa@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
linux-perf-users@vger.kernel.org,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Andi Kleen <ak@linux.intel.com>,
eranian@google.com, vincent.weaver@maine.edu,
"Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Subject: Re: System crash with perf_fuzzer (kernel: 5.0.0-rc3)
Date: Fri, 25 Jan 2019 10:11:28 -0500 (EST) [thread overview]
Message-ID: <alpine.DEB.2.21.1901251008310.32202@macbook-air> (raw)
In-Reply-To: <7c7ec3d9-9af6-8a1d-515d-64dcf8e89b78@linux.ibm.com>
On Fri, 25 Jan 2019, Ravi Bangoria wrote:
> I'm seeing a system crash while running perf_fuzzer with upstream kernel
> on an Intel machine. I hit the crash twice (out of which I don't have log
> of first crash so don't know if the reason is same for both the crashes).
> I've attached my .config with the mail.
> type = PERF_TYPE_HARDWARE;
> ========
>
> And, I'm running fuzzer in a loop with *root*. (Let me know if running
> as root is harmful ;-) ).
There's a known issue related to Intel BTS events that you can trigger
with the perf_fuzzer, even as a normal user. I reported it a few months
ago but I don't think it ever got resolved. The traces you get look
similar to some that you posted.
It's hard to track down as it doesn't seem to be a simple issue, but
rather it looks like the BTS event handling is stomping over memory it
shouldn't somehow.
Vince
next prev parent reply other threads:[~2019-01-25 15:11 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-25 6:46 Ravi Bangoria
2019-01-25 15:11 ` Vince Weaver [this message]
2019-01-25 16:00 ` Andi Kleen
2019-01-31 7:58 ` Ravi Bangoria
2019-01-31 13:00 ` Andi Kleen
2019-01-31 20:27 ` Cong Wang
2019-01-31 20:39 ` Andi Kleen
2019-03-06 23:09 ` Pavel Machek
2019-01-30 18:36 ` Jiri Olsa
2019-01-30 20:39 ` Andi Kleen
2019-01-30 22:33 ` Jiri Olsa
2019-01-31 7:36 ` Jiri Olsa
2019-01-31 8:27 ` Jiri Olsa
2019-02-01 7:43 ` Jiri Olsa
2019-02-01 7:54 ` Ravi Bangoria
2019-02-02 3:24 ` Ravi Bangoria
2019-02-02 10:34 ` Jiri Olsa
2019-02-01 16:27 ` Vince Weaver
2019-02-01 17:38 ` Jiri Olsa
2019-02-02 17:58 ` Vince Weaver
2019-02-04 12:35 ` [PATCH] perf: Add check_period pmu callback Jiri Olsa
2019-02-11 10:11 ` Peter Zijlstra
2019-02-11 13:22 ` [tip:perf/urgent] perf/x86: Add check_period PMU callback tip-bot for Jiri Olsa
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