linux-kernel - Re: [PATCH 1/1] broken perf tool on 4.4-rc1

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Date:	Mon, 1 Feb 2016 10:17:10 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	Tong Zhang <ztong@...edu>, <acme@...hat.com>, <jpoimboe@...hat.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] broken perf tool on 4.4-rc1



On 2016/1/31 5:02, Tong Zhang wrote:
> reproduce:
>    lzto@...d ~ $ ~/linux/tools/perf/perf record -I -e intel_pt/tsc=1,noretcomp=1/u /bin/ls
>    lzto@...d ~ $ ~/linux/tools/perf/perf script  -F event,comm,pid,tid,time,addr,ip,sym,dso,iregs
>    Segmentation fault
>    lzto@...d ~ $
>
> Upon further investigation, it seems that
> commit 747a9b0a08ae ("Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip")
> breaks perf tool.
>
> __list_del(): tools/include/linux/list.h does not check null pointer dereference

I don't have a Boradwell system, unable to reproduce the fault.

Could you please give the output of gdb's bt command?

We should try to fix the inappropriate list operation.

Thank you.