Hello,
> I got the following OOPS with kernel 3.14.4 (debian backport for wheezy) on
> our internet gateway while trying to establish a new PPTP tunnel from a
> NAT-ed host.
The second part may explain the crash :
crash> foreach bt
PID: 0 TASK: ffffffff81813480 CPU: 0 COMMAND: "swapper/0"
#0 [ffff8800bfa032f0] machine_kexec at ffffffff8104d1e7
#1 [ffff8800bfa03350] crash_kexec at ffffffff810dc815
#2 [ffff8800bfa03420] oops_end at ffffffff814f2538
#3 [ffff8800bfa03440] no_context at ffffffff814e7e94
#4 [ffff8800bfa03490] __do_page_fault at ffffffff814f4f16
#5 [ffff8800bfa035a0] page_fault at ffffffff814f1948
[exception RIP: nf_nat_setup_info+1137]
RIP: ffffffffa040ec41 RSP: ffff8800bfa03658 RFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff880036ce4d48 RCX: 0000000000000000
RDX: ffff8800bb463ac0 RSI: 00000000feeccf54 RDI: ffffffffa0411430
RBP: 0000000000003c3a R8: ffffffff81886f80 R9: ffff8800bb463ac0
R10: ffff8800bfa03638 R11: ffff880036ac0000 R12: 0000000000000000
R13: ffff8800bfa036b8 R14: 0000000000000000 R15: 0000000000000000
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#6 [ffff8800bfa03740] xt_snat_target_v0 at ffffffffa05250fd [xt_nat]
#7 [ffff8800bfa03780] ipt_do_table at ffffffffa04a5260 [ip_tables]
#8 [ffff8800bfa038b0] nf_nat_ipv4_fn at ffffffffa0516214 [iptable_nat]
#9 [ffff8800bfa03930] nf_nat_ipv4_out at ffffffffa0516488 [iptable_nat]
#10 [ffff8800bfa03950] nf_iterate at ffffffff8142ebf6
#11 [ffff8800bfa039a0] nf_hook_slow at ffffffff8142eca7
#12 [ffff8800bfa03a10] ip_output at ffffffff8143af2a
#13 [ffff8800bfa03a30] __netif_receive_skb_core at ffffffff813fe293
#14 [ffff8800bfa03ab0] br_handle_frame_finish at ffffffffa0456760 [bridge]
#15 [ffff8800bfa03b00] br_nf_pre_routing_finish at ffffffffa045d1a6 [bridge]
#16 [ffff8800bfa03b60] br_nf_pre_routing at ffffffffa045d9df [bridge]
#17 [ffff8800bfa03bb0] nf_iterate at ffffffff8142ebf6
#18 [ffff8800bfa03c00] nf_hook_slow at ffffffff8142eca7
#19 [ffff8800bfa03c70] br_handle_frame at ffffffffa0456b18 [bridge]
#20 [ffff8800bfa03cb0] __netif_receive_skb_core at ffffffff813fdfbd
#21 [ffff8800bfa03d30] napi_gro_receive at ffffffff813fecb5
#22 [ffff8800bfa03d60] tg3_poll_work at ffffffffa023649f [tg3]
#23 [ffff8800bfa03e30] tg3_poll at ffffffffa023f124 [tg3]
#24 [ffff8800bfa03e90] net_rx_action at ffffffff813ff9a9
#25 [ffff8800bfa03ea0] get_next_timer_interrupt at ffffffff81072bfa
#26 [ffff8800bfa03f00] __do_softirq at ffffffff81069a9e
#27 [ffff8800bfa03f70] irq_exit at ffffffff81069ebe
#28 [ffff8800bfa03f80] do_IRQ at ffffffff81017211
--- <IRQ stack> ---
#29 [ffffffff81801df8] ret_from_intr at ffffffff814f162d
[exception RIP: native_safe_halt+2]
RIP: ffffffff810512c2 RSP: ffffffff81801ea0 RFLAGS: 00000292
RAX: ffffffff8101e7f0 RBX: ffff8800bfa0ec80 RCX: ffffffff81840d60
RDX: ffff8800bfa00000 RSI: 0000000000000000 RDI: 0000000000000096
RBP: ffffffff818a6980 R8: 0000000000000000 R9: 0000000000000000
R10: 0000000000000000 R11: 000000010037af38 R12: 0000000000000082
R13: ffffffff8101d8c5 R14: 000000018101d86d R15: ffff8800bfa143b8
ORIG_RAX: ffffffffffffffad CS: 0010 SS: 0018
#30 [ffffffff81801ea0] default_idle at ffffffff8101e80d
#31 [ffffffff81801ed0] cpu_startup_entry at ffffffff810b7dc3
#32 [ffffffff81801f30] start_kernel at ffffffff818c6f11
#33 [ffffffff81801f80] x86_64_start_kernel at ffffffff818c672b
PID: 0 TASK: ffff8800bc2f09a0 CPU: 1 COMMAND: "swapper/1"
#0 [ffff8800bfa47e30] crash_nmi_callback at ffffffff81043827
#1 [ffff8800bfa47e40] nmi_handle at ffffffff814f26e5
#2 [ffff8800bfa47ec0] do_nmi at ffffffff814f28e0
#3 [ffff8800bfa47ef0] end_repeat_nmi at ffffffff814f1cb1
[exception RIP: _raw_spin_lock_bh+40]
RIP: ffffffff814f10a8 RSP: ffff8800bfa43d90 RFLAGS: 00000297
RAX: 0000000000000010 RBX: 0000000000000010 RCX: 0000000000000297
RDX: ffff8800bfa43d90 RSI: 0000000000000018 RDI: 0000000000000001
RBP: ffffffff814f10a8 R8: ffffffff814f10a8 R9: 0000000000000018
R10: ffff8800bfa43d90 R11: 0000000000000297 R12: ffffffffffffffff
R13: ffffffffa0411430 R14: 0000000000000200 R15: 0000000000006d06
ORIG_RAX: 0000000000006d06 CS: 0010 SS: 0018
--- <NMI exception stack> ---
#4 [ffff8800bfa43d90] _raw_spin_lock_bh at ffffffff814f10a8
#5 [ffff8800bfa43d90] nf_nat_cleanup_conntrack at ffffffffa040e09e [nf_nat]
#6 [ffff8800bfa43da0] __nf_ct_ext_destroy at ffffffffa0314d81 [nf_conntrack]
#7 [ffff8800bfa43dc0] nf_conntrack_free at ffffffffa030c477 [nf_conntrack]
#8 [ffff8800bfa43de0] nf_conntrack_destroy at ffffffff8142ea82
#9 [ffff8800bfa43df0] nf_ct_delete at ffffffffa030cc68 [nf_conntrack]
#10 [ffff8800bfa43e50] call_timer_fn at ffffffff8106ff07
#11 [ffff8800bfa43ea0] run_timer_softirq at ffffffff8107153f
#12 [ffff8800bfa43f20] __do_softirq at ffffffff81069a9e
#13 [ffff8800bfa43f90] irq_exit at ffffffff81069ebe
#14 [ffff8800bfa43fa0] smp_apic_timer_interrupt at ffffffff810466ab
#15 [ffff8800bfa43fb0] apic_timer_interrupt at ffffffff814fa35d
--- <IRQ stack> ---
#16 [ffff8800bc2f5e18] apic_timer_interrupt at ffffffff814fa35d
[exception RIP: native_safe_halt+2]
RIP: ffffffff810512c2 RSP: ffff8800bc2f5ec0 RFLAGS: 00000292
RAX: ffffffff8101e7f0 RBX: ffff8800bfa4ec80 RCX: ffffffff81840d60
RDX: ffff8800bfa40000 RSI: 0000000000000000 RDI: 0000000000000096
RBP: ffffffff818a6980 R8: 0000000000000000 R9: 0000000000000000
R10: 0000000000000000 R11: 000000010037aff9 R12: 0000000000000082
R13: ffffffff8101d8c5 R14: 000000018101d86d R15: ffff8800bfa543b8
ORIG_RAX: ffffffffffffff10 CS: 0010 SS: 0018
#17 [ffff8800bc2f5ec0] default_idle at ffffffff8101e80d
#18 [ffff8800bc2f5ef0] cpu_startup_entry at ffffffff810b7dc3
PID: 1 TASK: ffff8800bc2c71b0 CPU: 1 COMMAND: "init"
#0 [ffff8800bc2c98b8] __schedule at ffffffff814eddda
[...]
All other processes are in __schedule too
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