I've just experienced this oops too.
The kernel is a 2.6.10-ac8 and it doesn't seem this issue has been
fixed in 2.6.10-ac10 nor in 2.6.11-rc1 (sure I'd love to be wrong
here ;-) )
kernel BUG at net/ipv4/tcp_output.c:922!
invalid operand: 0000 [#1]
PREEMPT SMP
Modules linked in: nfsd exportfs parport_pc lp parport nfs lockd
sunrpc ipt_TCPMSS iptable_mangle ipt_owner iptable_nat ip_conntrack
ip_tables uhci_hcd usbcore intel_agp evdev raid5 xor md dm_mod md5
ipv6 adm1021 eeprom i2c_piix4 i2c_isa lm75 lm78 w83781d i2c_sensor
i2c_core agpgart scsi_mod 3c59x
CPU: 0
EIP: 0060:[<c0282671>] Not tainted VLI
EFLAGS: 00010202 (2.6.10-ac8)
EIP is at tcp_retrans_try_collapse+0x321/0x340
eax: e2868c80 ebx: c6060e20 ecx: 00000394 edx: 000005ac
esi: c9aaa2e8 edi: 00000000 ebp: f39d7ae0 esp: c036de90
ds: 007b es: 007b ss: 0068
Process swapper (pid: 0, threadinfo=c036c000 task=c02f7b40)
Stack: c03a287c 00000002 00000002 00000394 00000218 00000010 00000218
d664acd4
d664aae0 0000ffff d664acd4 c6060e20 d664aae0 c0282b0c d664aae0
c6060e20
000005ac c027a447 000005ac d664aae0 d664acd4 d664ab44 00000000
c0284a57
Call Trace:
[<c0282b0c>] tcp_retransmit_skb+0x2ec/0x360
[<c027a447>] tcp_enter_loss+0x67/0x230
[<c0284a57>] tcp_retransmit_timer+0x107/0x470
[<c011841f>] rebalance_tick+0xbf/0xd0
[<c0284e6e>] tcp_write_timer+0xae/0xf0
[<c0118553>] scheduler_tick+0x123/0x480
[<c0284dc0>] tcp_write_timer+0x0/0xf0
[<c0125efa>] run_timer_softirq+0xda/0x1a0
[<c0121b3a>] __do_softirq+0xba/0xd0
[<c0121b7d>] do_softirq+0x2d/0x30
[<c0138f39>] irq_exit+0x39/0x40
[<c0103b8c>] apic_timer_interrupt+0x1c/0x24
[<c0101030>] default_idle+0x0/0x40
[<c010105c>] default_idle+0x2c/0x40
[<c01010f2>] cpu_idle+0x42/0x60
[<c036e984>] start_kernel+0x154/0x170
[<c036e3a0>] unknown_bootoption+0x0/0x1e0
Code: e9 7f fe ff ff c7 44 24 08 53 26 28 c0 89 54 24 04 89 1c 24 e8
d1 9c fc ff e9 3a fe ff ff 0f 0b c9 02 cc 1d 2d c0 e9 0a fe ff ff <0f>
0b 9a 03 1a 15 2e c0 e9 c2 fd ff ff 89 f6 31 c0 e9 7f fd ff
<0>Kernel panic - not syncing: Fatal exception in interrupt
most of the netfilter modules reported above were in used.
I can provide more informations if needed.
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