linux-kernel - Re: ntp: BUG: spinlock lockup on CPU#1

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]

Date:	Thu, 15 Mar 2012 16:52:04 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	John Stultz <john.stultz@...aro.org>,
	Dave Jones <davej@...hat.com>,
	"linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>
Subject: Re: ntp: BUG: spinlock lockup on CPU#1

On Thu, Mar 15, 2012 at 4:04 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Thu, 15 Mar 2012, Sasha Levin wrote:
>
>> On Thu, Mar 15, 2012 at 3:23 PM, Sasha Levin <levinsasha928@...il.com> wrote:
>> > Hi all,
>> >
>> > I was doing some more fuzzing with trinity in a KVM tools guest, using
>> > today's linux-next, when I've experienced a complete system lockup
>> > (just in the guest ofcourse). After a bit I got the spew at the bottom
>> > of this mail.
>> >
>> > From what I can tell from the logs, there were several threads waiting
>> > on syscall results, and I suspect that the adjtimex() call on CPU3 is
>> > somehow responsible for this lockup.
>>
>> Oh, and I'm not sure if it's related or not, but I've started seeing
>> the following spew every time I start fuzzing:
>>
>> [   47.105987] ------------[ cut here ]------------
>> [   47.106021] WARNING: at kernel/time/clockevents.c:209
>
> It's unrelated, but I'm mighty curious how you manage that.

>From what I gather from the logs it's the result of adjtimex() being
called while a different CPU is in the middle of a syscall. It happens
quite often really, so I can get that warning to jump out pretty
easily.
--
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/