linux-kernel - Re: tracing ring_buffer

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: <1337885672.13348.194.camel@gandalf.stny.rr.com>
Date:	Thu, 24 May 2012 14:54:32 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Dave Jones <davej@...hat.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: tracing ring_buffer_resize oops.

On Thu, 2012-05-24 at 14:47 -0400, Dave Jones wrote:
> On Thu, May 24, 2012 at 01:35:14PM -0400, Steven Rostedt wrote:
> 
>  > Hmm, I wonder if this is the break point change :-/
>  > 
>  > Do you have NMIs enabled? I didn't have 'paranoid_exit' in my backtrace
>  > when I saw the bug.
> 
> $ grep NMI .config
> CONFIG_OPROFILE_NMI_TIMER=y
> CONFIG_HAVE_PERF_EVENTS_NMI=y
> CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG=y
> CONFIG_HPWDT_NMI_DECODING=y
> # CONFIG_DEBUG_NMI_SELFTEST is not set

Could you email your entire config. I haven't been able to trigger the
bug again. Maybe your config might do it :-/

Also, how reproducible is it? When it triggered for me, it was constant.
Every boot and test failed. But after I did the make mrproper, I have
not been able to trigger it again. This is why I put it down as a bad
build.

-- Steve


--
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/