> Here's what I get from ksymoops
>
> ----
> Warning (compare_maps): ksyms_base symbol
> vmalloc_to_page_R__ver_vmalloc_to_page not found in System.map.
> Ignoring ksyms_base entry
> Unable to handle kernel NULL pointer dereference at virtual
> address 00000020
> c01e52e4
> *pde = 00000000
> CPU: 0
> EIP: 0010:[<c01e52e4>] Not tainted
> Using defaults from ksymoops -t elf32-i386 -a i386
> EFLAGS: 00010097
> eax: cf21cc84 ebx: cf21c480 ecx: d7efd3fc edx: cf21c484
> esi: 00000000 ed1: 00000097 ebp: cf21cc84 esp: c0287f38
> Warning (Oops_set_regs): garbage 'ed1: 00000097 ebp: cf21cc84
> esp: c0287f38' at end of register line ignored
> ds: 0018 es: 0018 ss:0018
> Process swapper (pid: 0, stackpage=c0287000)
> Stack: 00000292 d7efd3fc 00000000 0000cc00 d7efd380 c0287fac c01e535b5
> d7efd380
> d7efd380 d7eede80 04000001 0000000b c0109e8a 0000000b d7efd380
> c0287fac
> c0287fac 0000000b c02bee80 d7eede80 c010a018 0000000b c0287fac
> d7eede80
> Call Trace: [<c01e53b5>] [<c0109e8a>] [<c010a018>] [<c0106f10>]
> [<c0106f10>]
> [<c010c108>] [<c0106f10>] [<c0106f36>] {<c0106fc2>] [<c0105000>]
> Code: c7 46 20 98 ff ff ff 8b 43 10 8b 1b 80 b8 00 00 00 8b 48
>
>
> >>EIP; c01e52e4 <uhci_remove_pending_qhs+44/90> <=====
>
the Tascam US-428 driver (copied / changed from snd-usb-audio ) showed a
similar problem.
I worked around it by not using ASYNC_UNLINKing of the urbs.
uhci_remove_pending_qhs is called to unlink urbs in ASYNC mode.
seems as if uhci has a bug ? or may we asyncly unlink only 1 urb at a time?
any experiences with kernels > 2.4.18 ?
Karsten
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