* 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
