From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Fengguang Wu <fengguang.wu@intel.com>,
linux-kernel@vger.kernel.org, Wang Nan <wangnan0@huawei.com>,
Ingo Molnar <mingo@redhat.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Will Deacon <will.deacon@arm.com>,
lkp@01.org, Dmitry Vyukov <dvyukov@google.com>,
kasan-dev@googlegroups.com
Subject: Re: BUG: KASAN: slab-out-of-bounds in perf_callchain_user+0x494/0x530
Date: Thu, 30 Nov 2017 16:37:12 -0300 [thread overview]
Message-ID: <20171130193712.GU3298@kernel.org> (raw)
In-Reply-To: <20171130082026.ih7esfpn4wfsfoge@hirez.programming.kicks-ass.net>
Em Thu, Nov 30, 2017 at 09:20:26AM +0100, Peter Zijlstra escreveu:
> On Thu, Nov 30, 2017 at 10:32:19AM +0800, Fengguang Wu wrote:
> > Hello,
> >
> > FYI this happens in mainline kernel 4.15.0-rc1.
> > It looks like a new regression and hard to bisect.
> >
> > It occurs in 1 out of 57 boots.
> >
> > [ 10.009610] chown (367) used greatest stack depth: 26944 bytes left
> > Kernel tests: Boot OK!
> > [ 30.357729] trinity-main uses obsolete (PF_INET,SOCK_PACKET)
> > [ 31.301433] sock: process `trinity-main' is using obsolete setsockopt SO_BSDCOMPAT
> > [ 31.310289] ==================================================================
> > [ 31.311490] BUG: KASAN: slab-out-of-bounds in perf_callchain_user+0x494/0x530:
> > perf_callchain_store at include/linux/perf_event.h:1128
> > (inlined by) perf_callchain_user at arch/x86/events/core.c:2485
>
> I don't think we recently changed anything here...
>
> But I do have vague memories of something being off here; I never quite
> could penetrate the max_stack / contexts_maxed stuff, and istr acme was
> going to have a peek.
Sure, but I saw some backward ring buffer stuff in there as well, no?
IIRC that came after the max-stack code, Adding Wang to the CC list.
- Arnaldo
next prev parent reply other threads:[~2017-11-30 19:37 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-30 2:32 BUG: KASAN: slab-out-of-bounds in perf_callchain_user+0x494/0x530 Fengguang Wu
2017-11-30 8:20 ` Peter Zijlstra
2017-11-30 19:37 ` Arnaldo Carvalho de Melo [this message]
2017-12-05 8:11 ` Namhyung Kim
2017-12-05 13:37 ` Arnaldo Carvalho de Melo
2017-12-05 14:47 ` Namhyung Kim
2017-12-06 13:47 ` Peter Zijlstra
2017-12-06 14:12 ` Arnaldo Carvalho de Melo
2017-12-06 14:31 ` Namhyung Kim
2017-12-06 15:45 ` Peter Zijlstra
2017-12-06 15:49 ` Namhyung Kim
2017-12-06 16:39 ` Peter Zijlstra
2017-12-06 15:46 ` Namhyung Kim
2017-12-06 13:40 ` Peter Zijlstra
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