linux-kernel - Re: perf: perf_fuzzer triggers NULL pointer dereference

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Message-ID: <87a7mj5yx4.fsf@ashishki-desk.ger.corp.intel.com>
Date:   Thu, 08 Nov 2018 18:14:47 +0200
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Vince Weaver <vincent.weaver@...ne.edu>,
        Vince Weaver <vincent.weaver@...ne.edu>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        torvalds@...ux-foundation.org
Subject: Re: perf: perf_fuzzer triggers NULL pointer dereference

Vince Weaver <vincent.weaver@...ne.edu> writes:

> On Thu, 8 Nov 2018, Vince Weaver wrote:
>
>> [91760.326510] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
>> [91760.334876] PGD 0 P4D 0 
>> [91760.337596] Oops: 0000 [#1] SMP PTI
>> [91760.341332] CPU: 6 PID: 0 Comm: swapper/6 Tainted: G        W         4.20.0-rc1+ #119
>> [91760.349816] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014
>> [91760.357723] RIP: 0010:perf_prepare_sample+0x82/0x4a0
>
> so what's the best way to do the equivelent of addr2line on something like 
> this, now that we aren't allowed to know the RIP anymore?

scripts/decode_stacktrace.sh works most of the time.

Sounds like BTS needs fixing up again. Thanks for looking at it though!

Regards,
--
Alex