Kernel Bug Tracker – Bug 6425
usbserial hangs system when downloading big files.
Last modified: 2006-04-22 15:11:02 UTC
Most recent kernel where this bug did not occur:
Distribution: amd64 Gentoo
Hardware Environment: HP SE L2000 laptop
Problem Description: Kyocera kpc650 EVDO pcmcia airmodem card ALWAYS hangs the
computer when I browse to a site with a big page or if I download large files,
e.g. `svn up` or `wget somefile.bz2`. Otherwise the card functions OK.
I get the following message on my root window:
Kernel Bug at net/core/skbuff.c:94
invalid operand: 0000  SMP
Modules linked in :
ppp_deflate 7104 0
zlib_deflate 23256 1 ppp_deflate
bsd_comp 7488 0
ip_conntrack_irc 8144 0
ip_conntrack_ftp 8848 0
ipt_REJECT 6464 4
ipt_LOG 8000 4
ipt_limit 4288 4
ipt_state 3904 181
ip_conntrack 50236 3 ip_conntrack_irc,ip_conntrack_ftp,ipt_state
iptable_filter 4800 1
ip_tables 20224 5
rfcomm 35296 6
l2cap 24064 5 rfcomm
snd_pcm_oss 48352 0
snd_mixer_oss 16768 1 snd_pcm_oss
snd_seq_dummy 5124 0
snd_seq_oss 31616 0
snd_seq_midi_event 8704 1 snd_seq_oss
snd_seq 51456 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event
snd_seq_device 9360 3 snd_seq_dummy,snd_seq_oss,snd_seq
uhci_hcd 31832 0
ohci1394 31116 0
8139cp 19968 0
snd_atiixp_modem 15116 1
snd_atiixp 18772 1
snd_ac97_codec 99416 2 snd_atiixp_modem,snd_atiixp
snd_ac97_bus 4480 1 snd_ac97_codec
snd_pcm 82440 4
snd_timer 22472 2 snd_seq,snd_pcm
snd 50504 14
snd_page_alloc 11152 3 snd_atiixp_modem,snd_atiixp,snd_pcm
binfmt_misc 11724 1
ppp_async 11200 1
ppp_generic 26912 7 ppp_deflate,bsd_comp,ppp_async
slhc 8000 1 ppp_generic
crc_ccitt 4096 1 ppp_async
usbserial 29488 3
ehci_hcd 40712 0
fglrx 503936 21
ndiswrapper 206816 0
hci_usb 16404 5
ohci_hcd 30788 0
Steps to reproduce:
Download a big file or browse to a site with lots of graphics.
I have not tried to see if uploading a large file also crashes the system.
I guess I'm reporting this problem to the right kernelbugs section going by
the "net/core/skbuff.c:94" error message.
Do you need the stack/register info that also got written to the root window?
It's just hard to copy all this by hand since the system is frozen and I can't
It'd be great if you could test 2.6.16.
What usb-serial driver are you using for this? I don't see one in your
Or are you using the "generic" usb-serial driver?
Created attachment 7936 [details]
Here's my /proc/config.gz
There is very little information on the Kyocera kpc650 card on google.
The web site http://wireless-internet-broadband-service.com/ has a link
for a linux driver:
But I followed the Gentoo guide:
which patched the generic usbserial driver by adding a "maxSize= parameter" to
mitigate time-outs caused by the modem's high bandpass being greater than the
usbserial driver's ability to keep up. However, I have never had Verizon EVDO
kick me off because of a timeout error. I am able to browse the internet just
fine so long as I stay clear of sites with fancy graphics. If instead of
connecting with the kpc650, I connect through my wlan0 I have no such
I do have to add the kernel paramter "pci-assign-busses" to my grub.conf
or my kpc650 doesn't power up or get recognized by the kernel.
My lsmod listing which I included in my bug report shows my driver:
"usbserial 29488 3"
I guess I can give one of the 2.6.16.? kernels a try, but I'll have to wait
until I go into work Monday and have wlan access so that I can download the
tarball without crashing.
No, that patch for the usb-serial core is wrong, do not use it.
Also, the generic driver as you are using, is not designed to handle large
ammounts of data, as there is no flow control.
So if you do use it, you are on your own. I suggest creating a separate driver
for this device, with full flow control, so it will work properly for you.