Date: Tue, 2 Dec 2003 00:50:54 -0500 (EST) From: Robert Watson <rwatson@freebsd.org> To: Thomas Moestl <t.moestl@tu-bs.de> Cc: sparc@freebsd.org Subject: Re: panic: trap: memory address not aligned in ata_prtdev() with Nov 18 GENERIC Message-ID: <Pine.NEB.3.96L.1031202004950.57038Q-100000@fledge.watson.org> In-Reply-To: <Pine.NEB.3.96L.1031201222010.57038H-100000@fledge.watson.org>
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On Mon, 1 Dec 2003, Robert Watson wrote: > On Mon, 1 Dec 2003, Thomas Moestl wrote: > > > This can happen when an ATA operation times out, and is caused by an > > access to a freed structure. I have attached a workaround; IIRC sos is > > developing a more complete fix for this. > > > > ISTR the timeouts were caused by the fact that Blade 100s come with > > ATA66-capable disks and controllers, but a non-ATA66 (40 pin) cable, and > > that for some reason the driver check to catch this situation did not > > work. I am not seeing this on my machine because I replaced the cable > > long ago when I added another disk. > > > > Can you confirm that your box does only have a 40 pin cable? > > Didn't get a chance to open up the box today, however, I did apply the > patch. It doesn't panic, ... but it does now hang solid. > > FreeBSD/sparc64 (ray.rv.nailabs.com) (screen) > > login: ad0: WARNING - WRITE_DMA recovered from missing interrupt > ad0: WARNING - READ_DMA recovered from missing interrupt > <hang> > > I'll reset the box and rebuild the kernel with BREAK_TO_DEBUGGER, > assuming I can keep it up that long. Nope, can't seem to get into the debugger. It's obviously unhappy, and quite possibly pushing up the daisies. login: Dec 2 00:39:13 ray su: rwatson to root on /dev/ttyp0 ad0: WARNING - WRITE_DMA recovered from missing interrupt ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) ata2: resetting devices .. ad0: FAILURE - already active DMA on this device ad0: setting up DMA failed done ad0: WARNING - WRITE_DMA recovered from missing interrupt ad0: WARNING - READ_DMA recovered from missing interrupt Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert@fledge.watson.org Senior Research Scientist, McAfee Research
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