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Date: Fri, 15 Jul 2016 18:09:25 +0200
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: kernel test robot <xiaolong.ye@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>,
        Anna-Maria Gleixner <anna-maria@linutronix.de>,
        Andy Lutomirski <luto@kernel.org>, Borislav Petkov <bp@suse.de>,
        Denys Vlasenko <dvlasenk@redhat.com>, Jan Beulich <JBeulich@suse.com>,
        Jiang Liu <jiang.liu@linux.intel.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        LKML <linux-kernel@vger.kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
        tipbuild@zytor.com, lkp@01.org
Subject: Re: [lkp] [x86/hpet]  a28b41ab00: RIP: 0010:[<ffffffff84884ef2>]
 [<ffffffff84884ef2>] __lock_acquire+0xce/0x649
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* kernel test robot | 2016-07-14 10:53:20 [+0800]:

>FYI, we noticed the following commit:
>
>https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tmp.smp/hotplug
>commit a28b41ab00dc93b9b16deda9d9b4b26601444f6d ("x86/hpet: Convert to hotplug state machine")

This is gone in the meantime. I have head
ecd8081f6fb9032c41e5c38885f06836da6ab455 of WIP.hotplug. The commit in
question is in as 48d7f6c71578 ("x86/hpet: Convert to hotplug state
machine").

>in testcase: boot
>
>on test machine: 2 threads qemu-system-x86_64 -enable-kvm -cpu Nehalem with 320M memory
>
>caused below changes:
…

>[    1.659021] Unpacking initramfs...
>[    1.696928] workqueue: round-robin CPU selection forced, expect performance impact
>[    1.702995] general protection fault: 0000 [#1]
>[    1.704143] Modules linked in:
>[    1.704950] CPU: 0 PID: 1 Comm: swapper Not tainted 4.7.0-rc7-00193-ga28b41a #1
>[    1.709158] task: ffff880012052000 ti: ffff880012054000 task.ti: ffff880012054000
>[    1.713142] RIP: 0010:[<ffffffff84884ef2>]  [<ffffffff84884ef2>] __lock_acquire+0xce/0x649

The tree I mentioned boots, I get pass this point and am in
|[   64.481048] rcu-torture: Reader Pipe:  2 0 0 0 0 0 0 0 0 0 0

so you might have tested a stale version of the patch queue.

Sebastian