Re: frequent lockups in 3.18rc4
From: DÃniel Fraga
Date: Tue Dec 02 2014 - 17:02:00 EST
On Tue, 2 Dec 2014 12:56:36 -0800
"Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx> wrote:
> And I left out a step. Let's make sure that my preempt_disabled() hack
> to CONFIG_TREE_PREEMPT_RCU=y has the same effect as the Kconfig hack
> that allowed CONFIG_PREEMPT=y and CONFIG_TREE_PREEMPT_RCU=n. Could you
> please try out the following patch configured with CONFIG_PREEMPT=y
> and CONFIG_TREE_PREEMPT_RCU=y?
Of course! I applied your patch to 3.17 stock kernel and after
stressing it (compiling with -j8 and watching videos on Youtube) to
trigger the bug I got the following:
Dec 2 19:47:25 tux kernel: [ 927.973547] INFO: rcu_preempt detected stalls on CPUs/tasks: { 5} (detected by 1, t=60002 jiffies, g=71142, c=71141, q=0)
Dec 2 19:47:26 tux kernel: [ 927.973553] Task dump for CPU 5:
Dec 2 19:47:26 tux kernel: [ 927.973555] cc1 R running task 0 30691 30680 0x00080008
Dec 2 19:47:26 tux kernel: [ 927.973558] ffff88021f351bc0 ffff8801d5743f00 ffffffff8107062a ffff88021f351c38
Dec 2 19:47:26 tux kernel: [ 927.973560] ffff8801d5743ea8 ffff8800cd3b0000 ffff8800cd3b041c 0000000000000000
Dec 2 19:47:26 tux kernel: [ 927.973562] 00007f89b4d7d8e8 00007f89b5939a60 ffff88021f34d2c0 00007f89b4d7f000
Dec 2 19:47:26 tux kernel: [ 927.973564] Call Trace:
Dec 2 19:47:26 tux kernel: [ 927.973573] [<ffffffff8107062a>] ? pick_next_task_fair+0x6aa/0x890
Dec 2 19:47:26 tux kernel: [ 927.973577] [<ffffffff81087483>] ? rcu_eqs_enter+0x93/0xa0
Dec 2 19:47:26 tux kernel: [ 927.973579] [<ffffffff81087f2e>] ? rcu_user_enter+0xe/0x10
Dec 2 19:47:26 tux kernel: [ 927.973582] [<ffffffff8103935a>] ? do_page_fault+0x5a/0x70
Dec 2 19:47:26 tux kernel: [ 927.973585] [<ffffffff8139bed2>] ? page_fault+0x22/0x30
Dec 2 19:47:30 tux kernel: [ 932.471964] CPU1: Core temperature above threshold, cpu clock throttled (total events = 820)
Dec 2 19:47:30 tux kernel: [ 932.471966] CPU6: Package temperature above threshold, cpu clock throttled (total events = 2624)
Dec 2 19:47:30 tux kernel: [ 932.471967] CPU3: Package temperature above threshold, cpu clock throttled (total events = 2624)
Dec 2 19:47:30 tux kernel: [ 932.471968] CPU7: Package temperature above threshold, cpu clock throttled (total events = 2624)
Dec 2 19:47:30 tux kernel: [ 932.471969] CPU0: Package temperature above threshold, cpu clock throttled (total events = 2624)
Dec 2 19:47:30 tux kernel: [ 932.471970] CPU2: Package temperature above threshold, cpu clock throttled (total events = 2624)
Dec 2 19:47:30 tux kernel: [ 932.471978] CPU1: Package temperature above threshold, cpu clock throttled (total events = 2624)
Dec 2 19:47:30 tux kernel: [ 932.472922] CPU1: Core temperature/speed normal
Dec 2 19:47:30 tux kernel: [ 932.472923] CPU6: Package temperature/speed normal
Dec 2 19:47:31 tux kernel: [ 932.472923] CPU2: Package temperature/speed normal
Dec 2 19:47:31 tux kernel: [ 932.472924] CPU3: Package temperature/speed normal
Dec 2 19:47:31 tux kernel: [ 932.472925] CPU0: Package temperature/speed normal
Waiting for your next instructions.
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