Date: Wed, 08 Oct 2008 14:32:27 +0300 From: Alexander Motin <mav@FreeBSD.org> To: Adam McDougall <mcdouga9@egr.msu.edu> Cc: FreeBSD-Current <freebsd-current@freebsd.org> Subject: Re: Hard crash with new snd_hda. Message-ID: <48EC9A4B.90706@FreeBSD.org> In-Reply-To: <1223436192.00023068.1223424004@10.7.7.3> References: <1222644184.00019171.1222632003@10.7.7.3> <1222809781.00019960.1222796402@10.7.7.3> <1223436192.00023068.1223424004@10.7.7.3>
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Adam McDougall wrote: >> This is probably the late consequence. I think debugging at this point >> won't give much. At least it will require deep data structures digging. >> >> You can enable some more debugging with setting hw.snd.verbose=4. May >> be it will give some clues. If not, probably we should try to add some >> debug printing near channel-to-device assignment loop near line 7170. >> We should try to find is the channel number was incorrectly set >> initially or it was erased later or channel memory itself was erased. >> >> The only idea I have now about the problem is that it may be related >> to the two audio codecs that you have on the same HDA bus. You are the >> first person who reported about such setup, so it wasn't ever tested. >> > I think I am having a similar issue, discovered it on a new model Dell > Latitude E6500. It is probably seeing a codec for HDMI and modem in > addition to the normal sound. Sound works if I patch the old hda driver > to detect my codec on 7.1, but I just got 8 installed last night. If I > have KDB_UNATTENDED and a dumpdev, it either hangs at the beginning of > the dump or reboots almost immediately after the panic. I can try to > hook up a serial or firewire console later and gather more info, but > tonight I might be too busy. In the meantime, here are two screenshots > of the panic and the backtrace: > http://www.egr.msu.edu/~mcdouga9/pics/1007081830.jpg > http://www.egr.msu.edu/~mcdouga9/pics/1007081831.jpg Looks very alike as I can see without verbose messages. I will try to think more about it, but as I can't reproduce it myself probably you will probably have to add some additional debugging as I have written to Frank. -- Alexander Motin
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