Re: Can't unload uhci_hcd module with 2.6.22 -- also oops

On Tue, 31 Jul 2007 10:22:42 -0400 (EDT)
Alan Stern <[email protected]> wrote:

>  That patch
> is meant for 2.6.23-rc1.  Can you try running 2.6.23-rc1 plus the patch
> and see if together they fix the problem?
> 

The patch is already applied to 2.6.23-rc1.

But after compiling 2.6.23-rc1 and undergoing the same steps
with the usb modem as before, the problem remains.  The only
difference is that the command "rmmod uhci-hcd" now reports
the message "Killed" instead of "Device busy."

Everything else still seems the same, however.  The module
is not unloaded.

Here is the 2.6.23-rc1 kernel log following the "rmmod uhci-hcd:"

usbcore: deregistering interface driver cdc_acm
uhci_hcd 0000:00:1d.3: remove, state 1
usb usb4: USB disconnect, address 1
uhci_hcd 0000:00:1d.3: USB bus 4 deregistered
ACPI: PCI interrupt for device 0000:00:1d.3 disabled
uhci_hcd 0000:00:1d.2: remove, state 1
usb usb3: USB disconnect, address 1
uhci_hcd 0000:00:1d.2: USB bus 3 deregistered
ACPI: PCI interrupt for device 0000:00:1d.2 disabled
uhci_hcd 0000:00:1d.1: remove, state 1
usb usb2: USB disconnect, address 1
usb 2-2: USB disconnect, address 2
Unable to handle kernel paging request at ffffffff88029d6e RIP: 
 [strcmp+0/34] strcmp+0x0/0x22
PGD 203067 PUD 207063 PMD 7f02a067 PTE 0
Oops: 0000 [1] SMP 
CPU 1 
Modules linked in: uhci_hcd usbcore
Pid: 784, comm: rmmod Not tainted 2.6.23-rc1 #1
RIP: 0010:[strcmp+0/34]  [strcmp+0/34] strcmp+0x0/0x22
RSP: 0000:ffff81002db27cd0  EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff810049bb2348 RCX: ffff81004430fc38
RDX: ffffffff802a002b RSI: ffffffff880131b3 RDI: ffffffff88029d6e
RBP: ffff81004430fc50 R08: 0000000000000000 R09: 000000000000131a
R10: ffff810002f58950 R11: ffffffff8800b3db R12: ffffffff880131b3
R13: ffff81007c115088 R14: ffff81004a982c58 R15: ffffffff880269f8
FS:  00002affd38b46f0(0000) GS:ffff810002f490c0(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffffffff88029d6e CR3: 000000002ef31000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process rmmod (pid: 784, threadinfo ffff81002db26000, task ffff81002ef3b7e0)
Stack:  ffffffff8029f351 ffff81004430fc38 0000000000000000 0000000000000000
 0000000000000000 ffffffff8801d8c0 ffffffff8801da80 ffff81004430fc38
 ffff81007c115000 ffff81007c115088 ffffffff802a2043 0000000000000040
Call Trace:
 [sysfs_hash_and_remove+97/146] sysfs_hash_and_remove+0x61/0x92
 [remove_files+35/55] remove_files+0x23/0x37
 [sysfs_remove_group+48/159] sysfs_remove_group+0x30/0x9f
 [_end+128931636/2131687328] :usbcore:usb_disable_device+0x89/0x107
 [_end+128915315/2131687328] :usbcore:usb_disconnect+0x98/0xee
 [_end+128915295/2131687328] :usbcore:usb_disconnect+0x84/0xee
 [_end+128923270/2131687328] :usbcore:usb_remove_hcd+0x85/0xe1
 [_end+128966298/2131687328] :usbcore:usb_hcd_pci_remove+0x1d/0x89
 [pci_device_remove+36/77] pci_device_remove+0x24/0x4d
 [__device_release_driver+130/184] __device_release_driver+0x82/0xb8
 [driver_detach+252/257] driver_detach+0xfc/0x101
 [bus_remove_driver+122/157] bus_remove_driver+0x7a/0x9d
 [pci_unregister_driver+16/129] pci_unregister_driver+0x10/0x81
 [_end+129057284/2131687328] :uhci_hcd:uhci_hcd_cleanup+0x10/0x2c
 [sys_delete_module+319/444] sys_delete_module+0x13f/0x1bc
 [__up_write+29/318] __up_write+0x1d/0x13e
 [system_call+126/131] system_call+0x7e/0x83


Code: 0f b6 17 89 d0 2a 06 48 83 c6 01 84 c0 75 0a 84 d2 74 06 48 
RIP  [strcmp+0/34] strcmp+0x0/0x22
 RSP <ffff81002db27cd0>
CR2: ffffffff88029d6e



Also, the lsof utility shows this:

ksuspend_usbd	698 root  cwd       DIR                8,1     456          2 /
ksuspend_usbd 	698 root  rtd       DIR                8,1     456          2 /
ksuspend_usbd 	698 root  txt   unknown                                       /proc/698/exe
khubd     	703 root  cwd       DIR                8,1     456          2 /
khubd     	703 root  rtd       DIR                8,1     456          2 /
khubd     	703 root  txt   unknown                                       /proc/703/exe

but both the /proc/698/exe and /proc/703/exe are broken links.

AK



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