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SubjectRe: Kernel 4.1 hang, apparently in __inet_lookup_established
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On Mon, 2016-01-11 at 12:27 -0800, Grant Zhang wrote:

> Hi Eric,
>
> One of my 4.1.13 server(have been up 50+ days) under testing got into a
> similar kernel hang (stack trace attached). Looking back at the initial
> conversation on this issue you also mentioned the following patch in
> https://lkml.org/lkml/2015/9/23/433
>
> http://git.kernel.org/cgit/linux/kernel/git/davem/net.git/commit/?id=ed2e923945892a8372ab70d2f61d364b0b6d9054
> tcp/dccp: fix timewait races in timer handling
>
> Which does not seem to be part of stable 4.1 tree. Would the above patch
> fix the kernel hang issue?
>
> Thanks,
>
> Grant
>
> ----stacktrace----
> Jan 9 19:12:42 kernel:[4544972.126385] INFO: rcu_sched self-detected
> stall on CPU { 13} (t=15001 jiffies g=422586407 c=422586406 q=3730083)
> Jan 9 19:12:42 kernel:[4544972.134383] INFO: rcu_sched detected stalls
> on CPUs/tasks: { 13} (detected by 5, t=15002 jiffies, g=422586407,
> c=422586406, q=3730200)
> Jan 9 19:12:42 kernel:[4544972.134384] Task dump for CPU 13:
> Jan 9 19:12:42 kernel:[4544972.134387] swapper/13 R running task
> 0 0 1 0x00000008
> Jan 9 19:12:42 kernel:[4544972.134389] 0000000000000010
> 0000000000000246 ffff885ecde0be68 0000000000000018
> Jan 9 19:12:42 kernel:[4544972.134390] ffffffff8164045d
> ffffffff00000007 00102982b9fa1875 ffffffff81c7fc80
> Jan 9 19:12:42 kernel:[4544972.134391] 0000000d00000000
> ffff88beff0e0300 ffffffff81ce5448 ffff885ecde08000
> Jan 9 19:12:42 kernel:[4544972.134391] Call Trace:
> Jan 9 19:12:42 kernel:[4544972.134397] [<ffffffff8164045d>] ?
> cpuidle_enter_state+0x7d/0x1f0
> Jan 9 19:12:42 kernel:[4544972.134398] [<ffffffff81640607>] ?
> cpuidle_enter+0x17/0x20
> Jan 9 19:12:42 kernel:[4544972.134401] [<ffffffff810b6c41>] ?
> cpu_startup_entry+0x2d1/0x350
> Jan 9 19:12:42 kernel:[4544972.134403] [<ffffffff810e0aac>] ?
> clockevents_config_and_register+0x2c/0x40
> Jan 9 19:12:42 kernel:[4544972.134406] [<ffffffff81034aa3>] ?
> start_secondary+0x123/0x130
> Jan 9 19:12:42 kernel:[4544972.149242] Task dump for CPU 13:
> Jan 9 19:12:42 kernel:[4544972.149244] swapper/13 R running task
> 0 0 1 0x00000008
> Jan 9 19:12:42 kernel:[4544972.149248] ffffffff81c3f300
> ffff88beff0c3820 ffffffff810a5791 000000000000000d
> Jan 9 19:12:42 kernel:[4544972.149250] ffffffff81c3f300
> ffff88beff0c3840 ffffffff810a8c4f ffff88beff0c3880
> Jan 9 19:12:42 kernel:[4544972.149251] ffffffff81c3f3c0
> ffff88beff0c3870 ffffffff810ca763 ffff88beff0d6c80
> Jan 9 19:12:42 kernel:[4544972.149253] Call Trace:
> Jan 9 19:12:42 kernel:[4544972.149255] <IRQ> [<ffffffff810a5791>]
> sched_show_task+0xb1/0x120
> Jan 9 19:12:42 kernel:[4544972.149267] [<ffffffff810a8c4f>]
> dump_cpu_task+0x3f/0x50
> Jan 9 19:12:42 kernel:[4544972.149270] [<ffffffff810ca763>]
> rcu_dump_cpu_stacks+0x93/0xc0
> Jan 9 19:12:42 kernel:[4544972.149272] [<ffffffff810cdcaa>]
> rcu_check_callbacks+0x4aa/0x760
> Jan 9 19:12:42 kernel:[4544972.149277] [<ffffffff8110e27c>] ?
> acct_account_cputime+0x1c/0x20
> Jan 9 19:12:42 kernel:[4544972.149279] [<ffffffff810d3868>]
> update_process_times+0x38/0x70
> Jan 9 19:12:42 kernel:[4544972.149283] [<ffffffff810e2a38>]
> tick_sched_timer+0x58/0x190
> Jan 9 19:12:42 kernel:[4544972.149284] [<ffffffff810d41ad>]
> __run_hrtimer+0x6d/0x220
> Jan 9 19:12:42 kernel:[4544972.149285] [<ffffffff810e29e0>] ?
> tick_init_highres+0x20/0x20
> Jan 9 19:12:42 kernel:[4544972.149287] [<ffffffff810d4893>]
> hrtimer_interrupt+0x103/0x240
> Jan 9 19:12:42 kernel:[4544972.149292] [<ffffffff810363f9>]
> local_apic_timer_interrupt+0x39/0x60
> Jan 9 19:12:42 kernel:[4544972.149296] [<ffffffff817b5275>]
> smp_apic_timer_interrupt+0x45/0x60
> Jan 9 19:12:42 kernel:[4544972.149299] [<ffffffff817b39bb>]
> apic_timer_interrupt+0x6b/0x70
> Jan 9 19:12:42 kernel:[4544972.149304] [<ffffffff816f36f0>] ?
> __inet_lookup_established+0x70/0x170
> Jan 9 19:12:42 kernel:[4544972.149306] [<ffffffff816f36c6>] ?
> __inet_lookup_established+0x46/0x170
> Jan 9 19:12:42 kernel:[4544972.149309] [<ffffffff8170eb7d>]
> tcp_v4_early_demux+0xad/0x160
> Jan 9 19:12:42 kernel:[4544972.149311] [<ffffffff816e9428>]
> ip_rcv_finish+0x158/0x380
> Jan 9 19:12:42 kernel:[4544972.149312] [<ffffffff816e9cf2>]
> ip_rcv+0x292/0x3b0
> Jan 9 19:12:42 kernel:[4544972.149318] [<ffffffffa04f0102>] ?
> macvlan_handle_frame+0x1f2/0x310 [macvlan]
> Jan 9 19:12:42 kernel:[4544972.149320] [<ffffffff816e92d0>] ?
> inet_add_protocol+0x50/0x50
> Jan 9 19:12:42 kernel:[4544972.149324] [<ffffffff81693bf0>]
> __netif_receive_skb_core+0x300/0x7b0
> Jan 9 19:12:42 kernel:[4544972.149325] [<ffffffff817b5185>] ?
> do_IRQ+0x65/0x110
> Jan 9 19:12:42 kernel:[4544972.149327] [<ffffffff816940c1>]
> __netif_receive_skb+0x21/0x70
> Jan 9 19:12:42 kernel:[4544972.149329] [<ffffffff81694271>]
> netif_receive_skb_internal+0x31/0xa0
> Jan 9 19:12:42 kernel:[4544972.149331] [<ffffffff81694ff0>]
> napi_gro_receive+0x130/0x1b0
> Jan 9 19:12:42 kernel:[4544972.149341] [<ffffffffa005f389>]
> ixgbe_clean_rx_irq+0x7b9/0xa20 [ixgbe]
> Jan 9 19:12:42 kernel:[4544972.149344] [<ffffffffa006024b>]
> ixgbe_poll+0x42b/0x7e0 [ixgbe]
> Jan 9 19:12:42 kernel:[4544972.149346] [<ffffffff816949ce>]
> net_rx_action+0x13e/0x320
> Jan 9 19:12:42 kernel:[4544972.149350] [<ffffffff8107fcce>]
> __do_softirq+0xde/0x2d0
> Jan 9 19:12:42 kernel:[4544972.149352] [<ffffffff8108009d>]
> irq_exit+0x4d/0x60
> Jan 9 19:12:42 kernel:[4544972.149353] [<ffffffff817b5185>]
> do_IRQ+0x65/0x110
> Jan 9 19:12:42 kernel:[4544972.149356] [<ffffffff817b36eb>]
> common_interrupt+0x6b/0x6b
> Jan 9 19:12:42 kernel:[4544972.149356] <EOI> [<ffffffff8164048e>] ?
> cpuidle_enter_state+0xae/0x1f0
> Jan 9 19:12:42 kernel:[4544972.149360] [<ffffffff8164045d>] ?
> cpuidle_enter_state+0x7d/0x1f0
> Jan 9 19:12:42 kernel:[4544972.149361] [<ffffffff81640607>]
> cpuidle_enter+0x17/0x20
> Jan 9 19:12:42 kernel:[4544972.149364] [<ffffffff810b6c41>]
> cpu_startup_entry+0x2d1/0x350
> Jan 9 19:12:42 kernel:[4544972.149366] [<ffffffff810e0aac>] ?
> clockevents_config_and_register+0x2c/0x40
> Jan 9 19:12:42 kernel:[4544972.149368] [<ffffffff81034aa3>]
> start_secondary+0x123/0x130
>

Hi Grant

Most probably the commit would help ;)

David, can you make sure ed2e923945892a8372ab70d2f61d364b0b6d9054 is
pushed to stable trees (4.1 & 4.2)

Thanks.



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