Seen this in 2 boots out of two on next-20151207 when IPV6 networking was available. It was stable when no net was available. Also, next-20161127 is OK. Haven't bisected it yet - this ring any bells? [ 92.231022] BUG: unable to handle kernel NULL pointer dereference at (null) [ 92.231035] IP: [<ffffffffb48579cb>] nf_ct_frag6_gather+0x81b/0xba0 [ 92.231046] PGD 0 [ 92.231050] Oops: 0000 [#1] PREEMPT SMP [ 92.231166] Call Trace: [ 92.231170] <IRQ> [ 92.231196] [<ffffffffb4856e96>] ipv6_defrag+0x66/0x80 [ 92.231206] [<ffffffffb47547b2>] nf_iterate+0x62/0x80 [ 92.231216] [<ffffffffb475488a>] nf_hook_slow+0xba/0x1b0 [ 92.231225] [<ffffffffb47547d5>] ? nf_hook_slow+0x5/0x1b0 [ 92.231235] [<ffffffffb481444d>] ipv6_rcv+0x83d/0x8d0 [ 92.231242] [<ffffffffb4813c4e>] ? ipv6_rcv+0x3e/0x8d0 [ 92.231251] [<ffffffffb48139a0>] ? ip6_input_finish+0x7e0/0x7e0 [ 92.231260] [<ffffffffb47162ea>] __netif_receive_skb_core+0x60a/0xd70 [ 92.231269] [<ffffffffb4716a70>] __netif_receive_skb+0x20/0x90 [ 92.231278] [<ffffffffb4718c90>] netif_receive_skb_internal+0x70/0x1f0 [ 92.231285] [<ffffffffb4718c45>] ? netif_receive_skb_internal+0x25/0x1f0 [ 92.231292] [<ffffffffb474277b>] ? eth_type_trans+0x11b/0x200 [ 92.231300] [<ffffffffb4718e69>] netif_receive_skb+0x59/0x170 [ 92.231308] [<ffffffffb4949c00>] ieee80211_deliver_skb+0x120/0x180 [ 92.231315] [<ffffffffb494de52>] ieee80211_rx_handlers+0x2762/0x29f0 [ 92.231324] [<ffffffffb46fe300>] ? skb_queue_tail+0x20/0x50 [ 92.231335] [<ffffffffb40c5e78>] ? do_raw_spin_lock+0x148/0x1e0 [ 92.231342] [<ffffffffb40bfb46>] ? trace_hardirqs_on_caller+0x16/0x1b0 [ 92.231358] [<ffffffffb494e32e>] ieee80211_prepare_and_rx_handle+0x24e/0xa80 [ 92.231365] [<ffffffffb494ed9a>] ? ieee80211_rx_napi+0x23a/0xf00 [ 92.231373] [<ffffffffb494f097>] ieee80211_rx_napi+0x537/0xf00 [ 92.231380] [<ffffffffb494ed9a>] ? ieee80211_rx_napi+0x23a/0xf00 [ 92.231391] [<ffffffffb49118a5>] ieee80211_tasklet_handler+0xc5/0xd0 [ 92.231401] [<ffffffffb4066b85>] tasklet_action+0x1d5/0x220 [ 92.231409] [<ffffffffb40672cc>] __do_softirq+0xec/0x5a0 [ 92.231417] [<ffffffffb4067954>] irq_exit+0xd4/0xe0 [ 92.231426] [<ffffffffb49b3afa>] do_IRQ+0x6a/0x120 [ 92.231434] [<ffffffffb49b2089>] common_interrupt+0x89/0x89 [ 92.231440] <EOI> [ 92.231450] [<ffffffffb465da3c>] ? cpuidle_enter_state+0x1ac/0x410 [ 92.231458] [<ffffffffb40bfced>] ? trace_hardirqs_on+0xd/0x10 [ 92.231466] [<ffffffffb465da47>] ? cpuidle_enter_state+0x1b7/0x410 [ 92.231476] [<ffffffffb465da3c>] ? cpuidle_enter_state+0x1ac/0x410 [ 92.231485] [<ffffffffb465dcd7>] cpuidle_enter+0x17/0x20 [ 92.231494] [<ffffffffb40b4e6d>] cpu_startup_entry+0x48d/0x520 [ 92.231503] [<ffffffffb403c874>] start_secondary+0x154/0x170 [ 92.231510] Code: 8b fd ff ff 48 8b 13 48 89 10 49 8b 0e 49 39 ce 0f 84 80 01 00 00 48 8b 11 48 39 d3 0f 84 71 01 00 00 49 39 d6 0f 84 6b 01 00 00 <48 > 8b 0a 48 39 cb 0f 84 59 01 00 00 48 89 ca 49 39 d6 75 ec e9 [ 92.231685] RIP [<ffffffffb48579cb>] nf_ct_frag6_gather+0x81b/0xba0 [ 92.231698] RSP <ffff88022dd03958> [ 92.231704] CR2: 0000000000000000 [ 92.231714] ---[ end trace 62089aaf8d90e56a ]--- [ 94.678192] Kernel panic - not syncing: Fatal exception in interrupt [ 94.678228] Kernel Offset: 0x33000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
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