Re: 2.6.12-rc1-mm2

[Andrew Morton <akpm@osdl.org>]

Laurent Riffard <laurent.riffard@free.fr> wrote:
>
> hello,
> 
> Same kinds of problem here. It depends on the removed module. I mean:
> "rmmod loop" or "rmmod pcspkr" works. But "rmmod snd_ens1371" or "rmmod
> ohci1394" hangs.
> 
> Sysrq-T when rmmoding snd_ens1371 :
> 
>   rmmod         D C92EBE8C     0  8231   8159                     (NOTLB)
>   c92ebea0 00000082 00000003 c92ebe8c 00000000 5685fc00 000f4253 cd624530
>          cd624658 cff60874 cff60844 c92ebebc c92ebef0 c02618c7 00000000
> cd624530
>          c0113137 00000000 00000000 00000282 cd248c20 cd248c07 00000001
> cd624530
>   Call Trace:
>    [wait_for_completion+124/193] wait_for_completion+0x7c/0xc1
>    [<c02618c7>] wait_for_completion+0x7c/0xc1
>    [device_release_driver+52/116] device_release_driver+0x34/0x74
>    [<c01f0ae3>] device_release_driver+0x34/0x74
>    [__remove_driver+8/12] __remove_driver+0x8/0xc
>    [<c01f0b2b>] __remove_driver+0x8/0xc
>    [driver_for_each_device+50/87] driver_for_each_device+0x32/0x57
>    [<c01f0bd8>] driver_for_each_device+0x32/0x57
>    [driver_detach+17/19] driver_detach+0x11/0x13
>    [<c01f0b40>] driver_detach+0x11/0x13
>    [bus_remove_driver+76/130] bus_remove_driver+0x4c/0x82
>    [<c01f05eb>] bus_remove_driver+0x4c/0x82
>    [driver_unregister+14/23] driver_unregister+0xe/0x17
>    [<c01f0cb2>] driver_unregister+0xe/0x17
>    [pci_unregister_driver+14/23] pci_unregister_driver+0xe/0x17
>    [<c019b242>] pci_unregister_driver+0xe/0x17
>    [sys_delete_module+322/379] sys_delete_module+0x142/0x17b
>    [<c0128356>] sys_delete_module+0x142/0x17b

It looks like we're getting stuck in the wait_for_completion() in the new
klist_remove().