Date: Sat, 04 Jun 2016 10:02:33 -0700 From: Matthew Macy <mmacy@nextbsd.org> To: "Michael Butler" <imb@protected-networks.net> Cc: "freebsd-current@freebsd.org" <freebsd-current@freebsd.org> Subject: Re: repeatable panic on pageout with 945GM Message-ID: <1551c5dbd86.c68532b5123717.566503881838650848@nextbsd.org> In-Reply-To: <939f9d2b-e925-e8e0-0ff3-8d90623728c6@protected-networks.net> References: <2490f1c7-8153-ece3-49ed-4b3886564fd7@protected-networks.net> <da19738b-6bf1-10a3-4428-43b6095ec35a@protected-networks.net> <205d4423-b834-9a21-785f-fa15d44c78ec@protected-networks.net> <CAHM0Q_PR5Aoak6A7f=tsRy0DJFCmLDVfRGpceZ0mXU3P%2BxO8DA@mail.gmail.com> <1551419a1db.12929035f45012.326107747932338888@nextbsd.org> <939f9d2b-e925-e8e0-0ff3-8d90623728c6@protected-networks.net>
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> > This "band-aid" seems to have worked. I haven't had a single panic since > - Thanks! :-) > > I tried to compile with -O0 but, for some reason, it panics in the sound > driver with a double-fault. When I get time, I'll recompile only the > files involved and see if I can't get a decent trace (and dump) to > identify the cause, No need. Based on the line that it crashed at, the problem is that with no mappings no pv_entry has been allocated. Somehow on your laptop you're able to get in to a situation where fictitious pages have been added to the object that don't get mapped. This isn't a strange situation in and of itself, but you seem to be the only hitting this. In any event, the DRM 4.6 port will support AGP in about a week. It will probably have bugs, but this one isn't in any of its code paths. I'm glad your system works a bit better now. Cheers. -M
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