root@hattie:~# BUG: spinlock recursion on CPU#0, nginx/5087 lock: 0xffff88031dcc2db0, .magic: dead4ead, .owner: nginx/5087, .owner_cpu: 0 Pid: 5087, comm: nginx Not tainted 3.7.10-vs2.3.5.6-d64-i7 #1 Call Trace: [] ? do_raw_spin_lock+0x125/0x140 [] ? _raw_spin_lock_irqsave+0x9/0x10 [] ? __inet_lookup_listener+0x185/0x520 [] ? tcp_v4_rcv+0x294/0x990 [] ? ip_local_deliver_finish+0xd4/0x290 [] ? __netif_receive_skb+0x222/0x7e0 [] ? inet_gro_receive+0x18c/0x1c0 [] ? netif_receive_skb+0x24/0x80 [] ? napi_skb_finish+0x50/0x70 [] ? bnx2_poll_work+0x849/0x1430 [bnx2] [] ? bnx2_poll_msix+0x3c/0xc0 [bnx2] [] ? net_rx_action+0x8f/0x180 [] ? __do_softirq+0xbf/0x1f0 [] ? call_softirq+0x1c/0x30 [] ? do_softirq+0x4d/0x80 [] ? irq_exit+0x8e/0xb0 [] ? do_IRQ+0x5b/0xd0 [] ? common_interrupt+0x6a/0x6a [] ? ip_v4_find_src+0x390/0x3f0 [] ? ip_v4_find_src+0x331/0x3f0 [] ? tcp_v4_connect+0x142/0x4f0 [] ? __inet_stream_connect+0x1ff/0x340 [] ? tcp_delack_timer_handler+0x1e0/0x1e0 [] ? inet_csk_init_xmit_timers+0x76/0xb0 [] ? ep_call_nested.constprop.10+0xea/0x100 [] ? inet_stream_connect+0x40/0x70 [] ? sys_connect+0x6e/0xb0 [] ? ep_create_wakeup_source+0x80/0x80 [] ? system_call_fastpath+0x1a/0x1f ------------[ cut here ]------------ WARNING: at kernel/watchdog.c:245 watchdog_overflow_callback+0x9a/0xd0() Hardware name: PowerEdge M610 Watchdog detected hard LOCKUP on cpu 0 Modules linked in: dm_mod 8021q bonding e1000 crc32c_intel ghash_clmulni_intel aesni_intel ablk_helper cryptd lrw aes_x86_64 xts gf128mul bnx2 acpi_power_meter dcdbas hed evdev Pid: 5087, comm: nginx Not tainted 3.7.10-vs2.3.5.6-d64-i7 #1 Call Trace: [] ? touch_nmi_watchdog+0x60/0x80 [] ? warn_slowpath_common+0x79/0xc0 [] ? warn_slowpath_fmt+0x45/0x50 [] ? touch_nmi_watchdog+0x80/0x80 [] ? watchdog_overflow_callback+0x9a/0xd0 [] ? __perf_event_overflow+0x9d/0x240 [] ? perf_event_update_userpage+0x25/0x120 [] ? intel_pmu_handle_irq+0x193/0x2e0 [] ? nmi_handle.isra.0+0x49/0x70 [] ? do_nmi+0xe7/0x360 [] ? end_repeat_nmi+0x1e/0x2e [] ? delay_tsc+0x11/0x50 [] ? delay_tsc+0x11/0x50 [] ? delay_tsc+0x11/0x50 <> [] ? do_raw_spin_lock+0xed/0x140 [] ? _raw_spin_lock_irqsave+0x9/0x10 [] ? __inet_lookup_listener+0x185/0x520 [] ? tcp_v4_rcv+0x294/0x990 [] ? ip_local_deliver_finish+0xd4/0x290 [] ? __netif_receive_skb+0x222/0x7e0 [] ? inet_gro_receive+0x18c/0x1c0 [] ? netif_receive_skb+0x24/0x80 [] ? napi_skb_finish+0x50/0x70 [] ? bnx2_poll_work+0x849/0x1430 [bnx2] [] ? bnx2_poll_msix+0x3c/0xc0 [bnx2] [] ? net_rx_action+0x8f/0x180 [] ? __do_softirq+0xbf/0x1f0 [] ? call_softirq+0x1c/0x30 [] ? do_softirq+0x4d/0x80 [] ? irq_exit+0x8e/0xb0 [] ? do_IRQ+0x5b/0xd0 [] ? common_interrupt+0x6a/0x6a [] ? ip_v4_find_src+0x390/0x3f0 [] ? ip_v4_find_src+0x331/0x3f0 [] ? tcp_v4_connect+0x142/0x4f0 [] ? __inet_stream_connect+0x1ff/0x340 [] ? tcp_delack_timer_handler+0x1e0/0x1e0 [] ? inet_csk_init_xmit_timers+0x76/0xb0 [] ? ep_call_nested.constprop.10+0xea/0x100 [] ? inet_stream_connect+0x40/0x70 [] ? sys_connect+0x6e/0xb0 [] ? ep_create_wakeup_source+0x80/0x80 [] ? system_call_fastpath+0x1a/0x1f ---[ end trace d9f7240909cad808 ]---