Messages in this thread | | | Date | Wed, 5 Dec 2001 11:17:35 +0100 (CET) | From | Gabriel Paubert <> | Subject | Re: USB audio w/ "D" state |
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On Wed, 5 Dec 2001, Albert D. Cahalan wrote:
> > I did "cat /bin/sh >> /dev/audio" and hit ^C to stop the noise. > The "cat" process gets stuck in "D" state with the WCHAN indicating > that the process is stuck 1/3 the way through the usbout_stop() > function. > > hardware: Mac Cube and the normal spherical speakers > kernel: plain 2.4.16 from www.kernel.org > compiler: gcc version 2.95.4 20011006 (Debian prerelease) > > In case PPC assembly is useful to somebody, I've marked the instruction > where the process gets stuck. The surrounding "bl" instructions look > like infinite loops to me, but maybe I'm reading this wrong. The assembly > is from: objdump -dl --start-address=0x1728 audio.o
Please add --reloc to this kind of dump, it makes the code much easier to follow in case you hit a compiler bug (this happens). Or directly disassemble vmlinux if it's not a module.
[snipped] > 1790: 38 60 00 01 li r3,1 > 1794: 48 00 00 01 bl 1794 <usbout_stop+0x6c> ^^^^^^^^ these bytes (and the 2 LSB of the first byte) will be modified by the linker or module loader.
> --> 1798: 7f a3 eb 78 mr r3,r29 > 179c: 48 00 00 01 bl 179c <usbout_stop+0x74> > 17a0: 48 00 00 01 bl 17a0 <usbout_stop+0x78>
Regards, Gabriel.
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