linux-kernel - Re: [PATCH] perf top: fix crash on annotate request

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Message-ID: <20111206134431.GA10709@infradead.org>
Date:	Tue, 6 Dec 2011 11:44:31 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Brian Gitonga Marete <marete@...hnix.com>
Cc:	David Ahern <dsahern@...il.com>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, peterz@...radead.org, fweisbec@...il.com
Subject: Re: [PATCH] perf top: fix crash on annotate request

Em Tue, Dec 06, 2011 at 10:22:57AM +0300, Brian Gitonga Marete escreveu:
> On Thu, Dec 1, 2011 at 5:11 PM, Arnaldo Carvalho de Melo <acme@...radead.org> wrote:
> > Its just this one, can you try doing something like:

> > perf top -vvv > /tmp/debug.top 2>&1
> > bzip2 /tmp/debug.top

> > That will print lots of information about symbols being loaded,
> > overlapping maps, etc that can help me understand why that symbol name
> > looks garbage.

> > And send me in pvt the result together with a fresh backtrace with those
> > symbols printed? Also which distro are you using?

> Hello Arnaldo. Curiously, I am unable to reproduce the crash when
> stdout is redirected to a file. I am able to capture lots of output if

That is good input, so can you please try using just:

perf top --stdio

I.e. probably the problem is with the TUI code and running it in --stdio
mode will help us pinpoint that. No need to redirect anything.

> I redirect stdout to a file in verbose mode, but it won't crash when I
> do that. Just the same, I am still able to always reproduce (within a
> few seconds) with your perf/core branch on the tree you pointed me to.
> This time, I did a `thread apply all bt' in gdb to show the trace for
> the UI thread since it now seems to me to probably have something with
> the UI output (because I cannot reproduce if o/put is to a file). The
> trace is attached in the file gdb.txt.
 
> Is the `perf top -vvv > /tmp/debug.top 2>&1' output useful even if it
> is captured in a session that does not crash? If so will send the
> output privately to you.

please.
 
> I am using Ubuntu 10.10

Ok,

- Arnaldo
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