linux-kernel - Re: [lkp-robot] [locking/ww_mutex] 857811a371: INFO:task_blocked_for_more

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Message-ID: <20170308121312.GL25284@nuc-i3427.alporthouse.com>
Date:   Wed, 8 Mar 2017 12:13:12 +0000
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     kernel test robot <xiaolong.ye@...el.com>
Cc:     Boqun Feng <boqun.feng@...il.com>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Nicolai Hähnle <Nicolai.Haehnle@....com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: Re: [lkp-robot] [locking/ww_mutex]  857811a371:
 INFO:task_blocked_for_more_than#seconds

On Wed, Mar 08, 2017 at 09:08:54AM +0800, kernel test robot wrote:
> 
> FYI, we noticed the following commit:
> 
> commit: 857811a37129f5d2ba162d7be3986eff44724014 ("locking/ww_mutex: Adjust the lock number for stress test")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> 
> in testcase: boot
> 
> on test machine: qemu-system-i386 -enable-kvm -m 320M
> 
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):

Now the test is running, it takes too long. :)

wait_for_completion_interruptible() would stop the hung task check? That
leaves NMI watchdog to check if we hit a deadlock between the workers.

And add a timeout to the stress test.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre