linux-kernel - Re: [PATCH] s390:ftrace: add save_stack_trace

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Date:	Fri, 29 Jan 2016 15:45:22 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Pratyush Anand <panand@...hat.com>, schwidefsky@...ibm.com,
	linux-s390@...r.kernel.org, Chunyu Hu <chuhu@...hat.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] s390:ftrace: add save_stack_trace_regs()

On Fri, Jan 29, 2016 at 08:59:36AM -0500, Steven Rostedt wrote:
> On Fri, 29 Jan 2016 13:57:49 +0100
> Heiko Carstens <heiko.carstens@...ibm.com> wrote:
> 
> > Surpringly it wasn't one of my own patches which broke the stack tracer on
> > s390, but one from Steven:
> > 
> > 72ac426a5bb0 ("tracing: Clean up stack tracing and fix fentry updates")
> > 
> > Now I only need to figure out why :)
> 
> Try this one?
> 
>   7717c6be699975f6733d278b13b7c4295d73caf6
>   tracing: Fix stacktrace skip depth in trace_buffer_unlock_commit_regs()
> 
> Or at the very least, merge with Linus's latest and see if something
> else doesn't fix it.

No, that doesn't fix it (current Linus' master):

# uname -a
Linux p2345007 4.5.0-rc1-00032-g26cd83670f2f #26 SMP Fri Jan 29 15:39:47 CET 2016 s390x s390x s390x GNU/Linux

# cat stack_max_size 
4496

# cat stack_trace
        Depth    Size   Location    (0 entries)
        -----    ----   --------