At Thu, 5 Sep 2002 21:02:00 +0200,
Karsten Wiese wrote:
>
> > 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.
yes, this could be the problem.
this happend once and i thought it fixed on the alsa side, but it
seems that there is something wrong on usb driver itself.
why it happened on jack is because jack caused xrun - and the driver
tries to stop the stream and unlinks urbs with ASYNC_UNLINK flag.
anyway, i changed the code on cvs to use SYNC unlink mode as default.
this may have a drawback that the urbs still exist even if the driver
stops the stream after detection of xrun. but usually this doesn't
matter so much.
i've tested normal playbacks and it seems working.
Takashi
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