I received this while testing the network card on a AMD Geode LX800 board.
(cat /dev/zero | nc remote-host remote-port) The machine config is attached.

------------[ cut here ]------------
kernel BUG at /usr/src/linux-2.6.25/kernel/workqueue.c:224!
invalid opcode: 0000 [#1]

Pid: 719, comm: nc Not tainted (2.6.25 #2)
EIP: 0060:[<c0223452>] EFLAGS: 00010283 CPU: 0
EIP is at queue_delayed_work_on+0x28/0x7b
EAX: cf0ae9e4 EBX: cf0ae9f0 ECX: cf0ae9e0 EDX: 00000000
ESI: cf002840 EDI: ffffffff EBP: cf0ae360 ESP: cc07fd08
 DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
Process nc (pid: 719, ti=cc07e000 task=ce7b73f0 task.ti=cc07e000)
Stack: cf059400 cf0ae000 cf0ae360 c02234cb 00000004 c037a1a5 d002e03e 00000050
       00000014 d002e000 d002e03e d002e000 cf0cc000 cf0f8400 c2b00157 cf1c9c80
       00000080 00000001 0000000a c0230811 c0537ae0 0000000a 00000000 0000000a
Call Trace:
 [<c02234cb>] queue_delayed_work+0x16/0x18
 [<c037a1a5>] rtl8169_interrupt+0x1bb/0x2ef
 [<c0230811>] handle_IRQ_event+0x1a/0x3f
 [<c023176c>] handle_level_irq+0x7a/0x8a
 [<c02064d4>] do_IRQ+0x4b/0x60
 [<c0204fbf>] common_interrupt+0x23/0x28
 [<c0430000>] tcp_recvmsg+0x475/0x6cc
 [<c043631d>] tcp_rcv_established+0x42/0x611
 [<c043af07>] tcp_v4_do_rcv+0x1f/0x13f
 [<c040dac1>] release_sock+0x30/0x6c
 [<c042fab3>] tcp_sendmsg+0x896/0x96e
 [<c021438e>] __wake_up_common+0x2d/0x52
 [<c040ba02>] sock_aio_write+0xb2/0xbb
 [<c024a72d>] do_sync_write+0xbd/0x104
 [<c02253e9>] autoremove_wake_function+0x0/0x2b
 [<c0227a03>] ktime_get_ts+0x11/0x3a
 [<c0227a3b>] ktime_get+0xf/0x2b
 [<c02151ae>] hrtick_start_fair+0xb3/0xec
 [<c024ae31>] vfs_write+0x94/0xfc
 [<c024b280>] sys_write+0x3c/0x63
 [<c0204616>] syscall_call+0x7/0xb
 =======================
Code: ff ff ff 57 89 c7 56 89 d6 53 8d 59 10 0f ba 29 00 19 c0 31 d2 85 c0 75 5
EIP: [<c0223452>] queue_delayed_work_on+0x28/0x7b SS:ESP 0068:cc07fd08
Kernel panic - not syncing: Fatal exception in interrupt