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Date: Sun, 12 Jan 2014 15:47:08 +0200
From: Juha Luoma <jsluoma@...umbus.fi>
To: linux-kernel@...r.kernel.org
Subject: Re: Watchdog detected hard LOCKUP on cpu 0 on FITPC2
Stefan Beller wrote:
> I noticed a machine to hang after a few days of uptime,
> i.e. the USB, networking etc are all gone, but the machine is still up
> and displaying the login screen.
>
> I am running
> $ uname -a
> Linux sd 3.12.5-302.fc20.i686 #1 SMP Tue Dec 17 21:01:18 UTC 2013 i686 i686 i386 GNU/Linux
I use a system that has a bit similar symptoms. That system still
answers to ping but I can't login any more. When I was still able to
access the system remotely, I was able to collect some data and reported
it here:
https://bugzilla.redhat.com/show_bug.cgi?id=1051626
[282818.373615] INFO: rcu_sched self-detected stall on CPU
[282818.373616] INFO: rcu_sched self-detected stall on CPU
[282818.373617] INFO: rcu_sched self-detected stall on CPU
[282818.373617] INFO: rcu_sched self-detected stall on CPU
[282818.373618] {
[282818.373618] {
[282818.373620] {
[282818.373620] 4
[282818.373621] 1
[282818.373621] 2
[282818.373622] }
[282818.373622] }
[282818.373623] (t=2400039 jiffies g=288243 c=288242 q=200719)
[282818.373623] (t=2400039 jiffies g=288243 c=288242 q=200719)
[282818.373624] } (t=2400039 jiffies g=288243 c=288242 q=200719)
[282818.373624] sending NMI to all CPUs:
[282818.373626] NMI backtrace for cpu 4
[282818.373627] CPU: 4 PID: 1203 Comm: java Not tainted
3.12.6-300.fc20.x86_64 #1
[282818.373628] Hardware name: Dell Inc. OptiPlex 9020/0PC5F7, BIOS A02
08/15/2013
[282818.373628] task: ffff8807e33ea940 ti: ffff8807ef640000 task.ti:
ffff8807ef640000
[282818.373633] RIP: 0010:[<ffffffff81312474>] [<ffffffff81312474>]
__bitmap_andnot+0x24/0x50
[282818.373633] RSP: 0018:ffff88081eb03d78 EFLAGS: 00000016
[282818.373634] RAX: 0000000000000000 RBX: 00000000000000ff RCX:
0000000000000004
[282818.373634] RDX: ffff88081ea0df80 RSI: ffff88081eb0df00 RDI:
ffff88081eb0df00
[282818.373635] RBP: ffff88081eb03d78 R08: 0000000000000000 R09:
0000000000000010
[282818.373636] R10: 0000000000013f5c R11: 0000000000040000 R12:
ffff88081eb0df00
[282818.373636] R13: 000000000000e000 R14: ffff88081ea0df80 R15:
0000000000080000
[282818.373637] FS: 00007f420eded700(0000) GS:ffff88081eb00000(0000)
knlGS:0000000000000000
[282818.373638] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[282818.373638] CR2: 00007f4f39dcd7b8 CR3: 00000007f1b94000 CR4:
00000000001407e0
[282818.373639] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[282818.373639] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[282818.373640] Stack:
[282818.373642] ffff88081eb03dd8 ffffffff81047c65 0000000000000096
000000021eb03de8
[282818.373643] 000000000000df80 0000000000000004 0000000000000004
0000000000002710
[282818.373645] ffffffff81c53bc0 ffffffff81c53bc0 ffff88081eb0ef60
000000000003100f
[282818.373645] Call Trace:
[282818.373646] <IRQ>
[282818.373649] [<ffffffff81047c65>] __x2apic_send_IPI_mask+0x1c5/0x1f0
[282818.373650] [<ffffffff81047cac>] x2apic_send_IPI_all+0x1c/0x20
[282818.373653] [<ffffffff81043627>]
arch_trigger_all_cpu_backtrace+0x57/0x90
[282818.373655] [<ffffffff81103aad>] rcu_check_callbacks+0x31d/0x600
[282818.373658] [<ffffffff81076d77>] update_process_times+0x47/0x80
[282818.373661] [<ffffffff810caca5>] tick_sched_handle.isra.15+0x25/0x60
[282818.373663] [<ffffffff810cad21>] tick_sched_timer+0x41/0x60
[282818.373665] [<ffffffff8108e704>] __run_hrtimer+0x74/0x1d0
[282818.373666] [<ffffffff810cace0>] ? tick_sched_handle.isra.15+0x60/0x60
[282818.373668] [<ffffffff8108ef17>] hrtimer_interrupt+0xf7/0x240
[282818.373670] [<ffffffff810419f7>] local_apic_timer_interrupt+0x37/0x60
[282818.373672] [<ffffffff8167437f>] smp_apic_timer_interrupt+0x3f/0x60
[282818.373673] [<ffffffff81672d1d>] apic_timer_interrupt+0x6d/0x80
[282818.373674] <EOI>
[282818.373676] [<ffffffff81669b0d>] ? _raw_spin_lock+0x2d/0x40
[282818.373677] [<ffffffff810cd098>] futex_wait+0xe8/0x290
[282818.373680] [<ffffffff811a019e>] ? lookup_page_cgroup_used+0xe/0x30
[282818.373682] [<ffffffff8108e440>] ? hrtimer_get_res+0x50/0x50
[282818.373683] [<ffffffff8108ed34>] ? hrtimer_start_range_ns+0x14/0x20
[282818.373684] [<ffffffff810cec96>] do_futex+0xe6/0xc30
[282818.373687] [<ffffffff810a18fc>] ? update_curr+0xcc/0x160
[282818.373689] [<ffffffff81011611>] ? __switch_to+0x181/0x4b0
[282818.373690] [<ffffffff810cf851>] SyS_futex+0x71/0x150
[282818.373691] [<ffffffff81672129>] system_call_fastpath+0x16/0x1b
[282818.373705] Code: 1f 84 00 00 00 00 00 48 63 c9 55 48 83 c1 3f 48 c1
e9 06 48 89 e5 85 c9 7e 32 41 89 c9 45 31 c0 31 c9 0f 1f 44 00 00 48 8b
04 ca <48> f7 d0 48 23 04 ce 48 89 04 cf 48 83 c1 01 49 09 c0 41 39 c9
- Juha
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