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From: Vince Weaver <vincent.weaver@maine.edu>
To: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: linux-kernel@vger.kernel.org,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>
Subject: Re: perf: WARNING: kernel/events/core.c:4893 perf_mmap_close
Date: Tue, 9 Aug 2016 08:53:33 -0400 (EDT)	[thread overview]
Message-ID: <alpine.DEB.2.20.1608090847390.14435@macbook-air> (raw)
In-Reply-To: <87k2fqmska.fsf@ashishki-desk.ger.corp.intel.com>


and as the fuzzing continues I started to get these, a bit worrying.

[ 6501.254564] Slab corruption (Tainted: G        W      ): task_struct start=ffff8800c072e000, len=5760
[ 6501.264971] 010: 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  jkkkkkkkkkkkkkkk
[ 6501.273650] Single bit error detected. Probably bad RAM.
[ 6501.279889] Run memtest86+ or a similar memory test tool.

[19535.776930] Slab corruption (Tainted: G        W      ): task_struct start=ffff8800c720e2c0, len=5760
[19535.787191] 010: 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  jkkkkkkkkkkkkkkk
[19535.795771] Single bit error detected. Probably bad RAM.
[19535.801872] Run memtest86+ or a similar memory test tool.

Is it possible this was a decrement-after-free bug?

It could also be bad RAM I suppose, I was using this machine to do some 
pretty intense DRAM RAPL validation which involved a lot of DIMM swapping 
so it is conceivable that I managed to break something.

Also lots of
[ 4714.797333] perfevents: irq loop stuck!
errors as always, I think we decided those were probably a hardware issue.

  parent reply	other threads:[~2016-08-09 12:53 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-08 20:22 Vince Weaver
2016-08-09  5:15 ` Alexander Shishkin
2016-08-09 12:43   ` Vince Weaver
2016-08-09 12:53   ` Vince Weaver [this message]
2016-08-12 17:17   ` Vince Weaver
2016-08-12 17:54     ` Alexander Shishkin
2016-08-23 15:12       ` Will Deacon
2016-08-23 17:06         ` Peter Zijlstra
2016-08-23 17:08         ` Alexander Shishkin
2016-08-24  9:19           ` Will Deacon
2016-08-24 11:44             ` Alexander Shishkin
2016-08-24 13:13             ` [tip:perf/urgent] perf/core: Use this_cpu_ptr() when stopping AUX events tip-bot for Will Deacon

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