On Tue, Feb 18, 2014 at 01:12:03PM +0800, Michael wang wrote:
> Hi, Folks
>
> Got below panic while testing tip/master on x86 box, it randomly
> occur while booting or rebooting, any ideas?
>
> Regards,
> Michael Wang
>
>
>
> systemd-readahead-collect[484]: Failed to create fanotify object: Function
> not implemented
> INFO: rcu_sched detected stalls on CPUs/tasks: { 5} (detected by 4, t=21007
> jiffies, g=1100, c=1099, q=802)
> Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 5
> CPU: 5 PID: 95 Comm: kworker/5:1 Not tainted 3.14.0-rc2+ #401
> Hardware name: IBM System x3650 M3 -[794582A]-/94Y7614, BIOS
> -[D6E154AUS-1.13]- 09/23/2011
> 0000000000000000 ffff88097f2a7bd8 ffffffff8156b8ca 00000000000040d2
> ffffffff817ecc30 ffff88097f2a7c58 ffffffff815622cd ffff88097f2a7c08
> ffffffff00000010 ffff88097f2a7c68 ffff88097f2a7c08 ffff88097f2a7c78
> Call Trace:
> <NMI> [<ffffffff8156b8ca>] dump_stack+0x46/0x58
> [<ffffffff815622cd>] panic+0xbe/0x1ce
> [<ffffffff810e7043>] watchdog_overflow_callback+0xb3/0xc0
> [<ffffffff8111ee68>] __perf_event_overflow+0x98/0x220
> [<ffffffff8111f764>] perf_event_overflow+0x14/0x20
> [<ffffffff8101eef2>] intel_pmu_handle_irq+0x1c2/0x2c0
> [<ffffffff810895e2>] ? find_busiest_group+0x42/0x840
> [<ffffffff810895f6>] ? find_busiest_group+0x56/0x840
> [<ffffffff81563002>] ? printk+0x4d/0x4f
> [<ffffffff815768f4>] perf_event_nmi_handler+0x34/0x60
> [<ffffffff815760ae>] nmi_handle+0x7e/0x140
> [<ffffffff8157625a>] default_do_nmi+0x5a/0x250
> [<ffffffff815764e0>] do_nmi+0x90/0xd0
> [<ffffffff81575727>] end_repeat_nmi+0x1e/0x2e
> [<ffffffff8107ec08>] ? idle_cpu+0x48/0x50
> [<ffffffff8107ec08>] ? idle_cpu+0x48/0x50
> [<ffffffff8107ec08>] ? idle_cpu+0x48/0x50
> <<EOE>> [<ffffffff81089761>] ? find_busiest_group+0x1c1/0x840
> [<ffffffff81089f5c>] load_balance+0x17c/0x5a0
I don't see an opportunity for load_balance() to loop with interrupts
disabled, but maybe I am looking at the wrong code. The NMI handler
looks to me like it is diagnosing rather than being the problem.
Thanx, Paul
> [<ffffffff8108a88f>] idle_balance+0x10f/0x1c0
> [<ffffffff8108aa5e>] pick_next_task_fair+0x11e/0x2a0
> [<ffffffff8107bbf3>] ? dequeue_task+0x73/0x90
> [<ffffffff815717fa>] __schedule+0x12a/0x670
> [<ffffffff81571e19>] schedule+0x29/0x70
> [<ffffffff81067daf>] worker_thread+0x1bf/0x370
> [<ffffffff81067bf0>] ? manage_workers+0x160/0x160
> [<ffffffff8106e799>] kthread+0xc9/0xe0
> [<ffffffff8106e6d0>] ? flush_kthread_worker+0xb0/0xb0
> [<ffffffff8157d62c>] ret_from_fork+0x7c/0xb0
> [<ffffffff8106e6d0>] ? flush_kthread_worker+0xb0/0xb0
> Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range:
> 0xffffffff80000000-0xffffffff9fffffff)
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