linux-kernel - Re: rb tree hrtimer lockup bug (found by perf

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: <alpine.DEB.2.10.1403310926060.7985@vincent-weaver-1.um.maine.edu>
Date:	Mon, 31 Mar 2014 09:30:52 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Thomas Gleixner <tglx@...utronix.de>
cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Greg KH <greg@...ah.com>
Subject: Re: rb tree hrtimer lockup bug (found by perf_fuzzer)

On Mon, 31 Mar 2014, Thomas Gleixner wrote:
> 
> Vince, can you please disable CONFIG_DEBUG_KOBJECT_RELEASE and remove
> all the debug patches to see whether the issue goes away?

It makes the crash on boot go away, but it is still possible to trigger
a similar crash (hrtimer oopsing due to corrupt rbtree) using the 
perf_fuzzer.

This all started because when trying to debug the perf_fuzzer crash I 
was told to turn on the extra debugging, and then that caused the crash at 
boot.

The fuzzer related crash happens on both a core2 and a haswell machine
and it triggers pretty quickly when fuzzing, I'll have to go back and see 
how repeatable it is.

Vince
--
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/