linux-kernel - Re: WARNING: at kernel/trace/ftrace.c:1605 __ftrace_hash_rec

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Message-ID: <20130611003712.GA9537@redhat.com>
Date:	Mon, 10 Jun 2013 20:37:12 -0400
From:	Dave Jones <davej@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: WARNING: at kernel/trace/ftrace.c:1605
 __ftrace_hash_rec_update.part.37+0x20a/0x240()

On Mon, Jun 10, 2013 at 08:33:14PM -0400, Steven Rostedt wrote:
 > On Mon, 2013-06-10 at 19:48 -0400, Dave Jones wrote:
 > > 3.10-rc5 + the two patches referenced in the RCU thread from earlier.
 > > 
 > > 	Dave
 > > 
 > > [ 2313.381283] WARNING: at kernel/trace/ftrace.c:1605 __ftrace_hash_rec_update.part.37+0x20a/0x240()
 > 
 > Grumble,
 > 
 > Somehow the list of functions that perf enabled got out of sync with
 > what ftrace had. When perf disabled its list of functions from ftrace,
 > perf thought it had a function enabled that wasn't and ftrace cried
 > about that.
 > 
 > What does 'trinity-child2' do?

Same as all the other child processes. Random syscalls, semi-intelligent args.

 > and is this reproducible?

I'm sure I'll hit it again eventually.  The This one looks tricky because
the trace isn't a syscall that I can go hammer on, it's happening
at process exit time.

	Dave

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