linux-kernel - Re: fs: GPF in locked_inode_to_wb_and_lock

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Message-ID: <20160421161400.GN7822@mtj.duckdns.org>
Date:	Thu, 21 Apr 2016 12:14:00 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>
Subject: Re: fs: GPF in locked_inode_to_wb_and_lock_list

Hello,

On Thu, Apr 21, 2016 at 10:25:12AM +0200, Dmitry Vyukov wrote:
> I use this script for symbolization:
> https://github.com/google/sanitizers/blob/master/address-sanitizer/tools/kasan_symbolize.py
> It invokes addr2line to provide file:line info, adds inline frames,
> strips ? frames (are they ever useful?) and strips timestamps.

Heh, sometimes they are.  They obviously are useful when backlinks are
broken for some reason.  Through the remnants of the old call stacks,
they also can sometimes tell the history of the task - where it was
before it got to the current backtrace.  It isn't reliable at all but
I can recall several occasions where they were useful in root causing
issues.  It *might* make a sense to have an option to not strip them.

And, yeah, I'm all for it being in the kernel tree.

Thanks.

-- 
tejun