Red Hat Bugzilla – Bug 442265
126.96.36.199-64: rmmod usbserial -> BUG + OOPS (paging request)
Last modified: 2009-01-09 01:22:58 EST
Kernel OOPS report:
problem: rmmod sierra; rmmod usbserial -> BUG/OOPS -> paging request
machine: Lenovo X61s
processor: Core 2 duo L7700, 1.8GHz
system: fc8, fully updated
involved: embedded Sierra Wireless MC5725, vendor=0x1199, product=0x0220
Sometimes I want to go really low power when disconnected so
I rmmod all the USB stuff and shut off radios. After
disabling the WWAN radio via /proc/acpi/ibm/wan and trying
to rmmod sierra and then usbserial, I get a kernel BUG/OOPS.
Note that the output says that usbserial is linked into the
kernel but I'm not sure why because I can remove and add it
at will. It just fails sometimes, especially after it's
been working and transmitting. It may or may not have to do
with disabling the radio first, but I do believe I've
triggered it before without having to do that first. If
it's important to know I can determine this empirically.
It doesn't OOPS all the time even given the reproduction
scenario. Sometimes I can do it 2-3 times before it will
OOPS. Never will it go more than, say, 5 times without
the bug appearing.
OOPS is below (inline) and full dmesg output of the kernel
init through to the OOPS is attached.
No more message text follows. Let me know if anything more
is needed or could be helpful.
* * *
usbcore: deregistering interface driver usbserial_generic
BUG: unable to handle kernel paging request at virtual address f8fc3410
printing eip: f8ff5ae3 *pde = 37b69067 *pte = 00000000
Oops: 0000 [#1] SMP
Modules linked in: usbserial [...]
Pid: 27676, comm: modprobe Not tainted (188.8.131.52-64.fc8 #1)
EIP: 0060:[<f8ff5ae3>] EFLAGS: 00210246 CPU: 0
EIP is at destroy_serial+0x3c/0x102 [usbserial]
EAX: f5691c80 EBX: f5691c80 ECX: f8871554 EDX: f8fc3360
ESI: f8ff5aa7 EDI: 00000003 EBP: f5cb941c ESP: dd3c8e90
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process modprobe (pid: 27676, ti=dd3c8000 task=f56693b0 task.ti=dd3c8000)
Stack: c04334a0 00200246 c0498db1 00200246 f5691cb4 f8ff5aa7 00000003 c04fc07e
f5691c80 c05860e2 f8ffae98 f5691c80 c062b3b3 f5691cb4 f5691c80 f8ff59db
f5eb7c00 f8ff5e8a 00000118 00000007 c058688d f5cb9400 f5cb941c f8ffafe0
[<f8ff5aa7>] destroy_serial+0x0/0x102 [usbserial]
[<f8ff59db>] usb_serial_put+0x1c/0x27 [usbserial]
[<f8ff5e8a>] usb_serial_disconnect+0x74/0x9d [usbserial]
[<f8ff738f>] usb_serial_generic_deregister+0xa/0x14 [usbserial]
[<f8ff7b29>] usb_serial_exit+0x5/0x33 [usbserial]
Code: 25 8b 43 04 8b 00 c7 44 24 08 26 7d ff f8 c7 44 24 04 1c 7f ff f8 c7 04 24
37 84 ff f8 89 44 24 0c e8 7c 9c 43 c7 8b 53 04 89 d8 <ff> 92 b0 00 00 00 83 3d
04 c4 ff f8 00 74 1c c7 44 24 08 35 7d
EIP: [<f8ff5ae3>] destroy_serial+0x3c/0x102 [usbserial] SS:ESP 0068:dd3c8e90
---[ end trace 1192c1a5a507e4df ]---
Created attachment 302276 [details]
dmesg output of kernel init, includes oops at bottom
Oops is at drivers/usb/serial/usb-serial.c:140:
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