When my pcmcia modem is inserted and I load irda, the computer usually locks up,
this last time the keyboard quit working, but other things seemed fine.  The
kernel issued the following error message to syslog:

Jan  2 09:13:05 kirby irattach: executing: 'echo kirby > /proc/sys/net/irda/devn
ame'
Jan  2 09:13:05 kirby irattach: Starting device irda1
Jan  2 09:13:05 kirby kernel: skb_under_panic: text:e0e25016 len:3 put:2 head:da
971400 data:da9713fe tail:da971401 end:da971480 dev:<NULL>
Jan  2 09:13:05 kirby kernel: ------------[ cut here ]------------
Jan  2 09:13:05 kirby kernel: kernel BUG at net/core/skbuff.c:111!
Jan  2 09:13:05 kirby kernel: invalid opcode: 0000 [#1]
Jan  2 09:13:05 kirby kernel: SMP 
Jan  2 09:13:05 kirby kernel: last sysfs file: /class/net/lo/ifindex
Jan  2 09:13:05 kirby kernel: Modules linked in: irnet ppp_generic slhc irtty_si
r sir_dev ircomm_tty ircomm irda crc_ccitt tun fuse autofs4 hidp rfcomm l2cap bl
uetooth sunrpc freq_table video sbs i2c_ec dock button battery ac radeon drm ipv
6 parport_pc lp parport snd_intel8x0m snd_intel8x0 snd_ac97_codec snd_ac97_bus s
nd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss s
nd_mixer_oss serial_cs snd_pcm aes snd_timer floppy snd pcnet_cs i2c_i801 soundc
ore ide_cd cdrom e1000 i2c_core snd_page_alloc 8390 pcspkr airo serio_raw dm_sna
pshot dm_zero dm_mirror dm_mod ext3 jbd ehci_hcd ohci_hcd uhci_hcd
Jan  2 09:13:05 kirby kernel: CPU:    0
Jan  2 09:13:05 kirby kernel: EIP:    0060:[<c05ac1a4>]    Not tainted VLI
Jan  2 09:13:05 kirby kernel: EFLAGS: 00210292   (2.6.18-1.2849.fc6 #1) 
Jan  2 09:13:05 kirby kernel: EIP is at skb_under_panic+0x5e/0x6c
Jan  2 09:13:05 kirby kernel: eax: 00000070   ebx: dc8778c0   ecx: c0671c50   ed
x: 00200096
Jan  2 09:13:05 kirby kernel: esi: 00000002   edi: 00000010   ebp: dec30ea4   es
p: c56aee54
Jan  2 09:13:05 kirby kernel: ds: 007b   es: 007b   ss: 0068
Jan  2 09:13:05 kirby kernel: Process irattach (pid: 26446, ti=c56ae000 task=cda
a85e0 task.ti=c56ae000)
Jan  2 09:13:05 kirby kernel: Stack: c06523c9 e0e25016 00000003 00000002 da97140
0 da9713fe da971401 da971480 
Jan  2 09:13:05 kirby kernel:        c0636f98 d20527c0 dc8778c0 e0e2501b dec30e0
0 dc8778c0 e0e2abe3 e0a216c8 
Jan  2 09:13:05 kirby kernel:        c1ef3800 d81a1800 e0a216a0 00000000 e0a2037
9 000000d0 00000001 dedeccfc 
Jan  2 09:13:05 kirby kernel: Call Trace:
Jan  2 09:13:05 kirby kernel:  [<e0e2501b>] irlmp_data_request+0x30/0x4c [irda]
Jan  2 09:13:05 kirby kernel:  [<e0e2abe3>] irttp_run_rx_queue+0x1b5/0x1cb [irda
]
Jan  2 09:13:05 kirby kernel:  [<e0a20379>] irtty_start_dev+0x48/0x90 [irtty_sir
]
Jan  2 09:13:05 kirby kernel:  [<e0a1a457>] sirdev_open+0x134/0x1e1 [sir_dev]
Jan  2 09:13:05 kirby kernel:  [<c05b1bce>] dev_open+0x2b/0x62
Jan  2 09:13:05 kirby kernel:  [<c05b05f2>] dev_change_flags+0x46/0xe3
Jan  2 09:13:05 kirby kernel:  [<c05b1fa7>] dev_ioctl+0x3a2/0x46b
Jan  2 09:13:05 kirby kernel:  [<c047b133>] do_ioctl+0x1f/0x63
Jan  2 09:13:05 kirby kernel:  [<c047b3c1>] vfs_ioctl+0x24a/0x25c
Jan  2 09:13:05 kirby kernel:  [<c047b41f>] sys_ioctl+0x4c/0x65
Jan  2 09:13:05 kirby kernel:  [<c0404027>] syscall_call+0x7/0xb
Jan  2 09:13:05 kirby kernel: DWARF2 unwinder stuck at syscall_call+0x7/0xb
Jan  2 09:13:05 kirby kernel: Leftover inexact backtrace:
Jan  2 09:13:05 kirby kernel:  =======================
Jan  2 09:13:05 kirby kernel: Code: c7 04 24 c9 23 65 c0 89 44 24 18 8b 83 a0 00
 00 00 89 44 24 14 8b 83 9c 00 00 00 89 44 24 10 8b 43 60 89 44 24 08 e8 4e 54 e
7 ff <0f> 0b 6f 00 62 23 65 c0 83 c4 24 5b 5e c3 56 89 d6 53 89 c3 83 
Jan  2 09:13:05 kirby kernel: EIP: [<c05ac1a4>] skb_under_panic+0x5e/0x6c SS:ESP
 0068:c56aee54