linux-kernel - Re: [PATCH][GIT PULL] tracing: Fix compile issue for trace_sched

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20101020164324.GC7348@redhat.com>
Date:	Wed, 20 Oct 2010 12:43:24 -0400
From:	Jason Baron <jbaron@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	masami.hiramatsu.pt@...achi.com
Subject: Re: [PATCH][GIT PULL] tracing: Fix compile issue for
	trace_sched_wakeup.c

On Wed, Oct 20, 2010 at 05:40:45PM +0200, Ingo Molnar wrote:
> FYI, there's a new mystery hang (sometimes crash) that triggers in -tip - and which 
> seems to be tracing related. See the crashlog below - config attached.
> 
> It's not bisectable - small changes in the kernel make the bug come/go. (might be a 
> race of some sorts)
> 
> Thanks,
> 
> 	Ingo
> 

strange b/c it looks like we get though enabling/disabling the
tracepoitns individually, but then when we go to enable all the
tracepoints we hit this hang - perhaps, suggesting a race. Do we always
fail after "Testing all events:" is printed? Does the crash have any
more clues. I will try and re-produce this.

Also, I noticed some recent changes to text_poke_smp() usage of
stop_machine() on Oct. 14th. That's related to the area where this appears
to hang, so if things were working with this .config before then, that
might be a place to look. Adding Masami to the 'cc list.

thanks,

-Jason
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/