Date: Wed, 01 Sep 2004 12:56:22 -0700 From: "Kevin Oberman" <oberman@es.net> To: Nate Lawson <nate@root.org> Cc: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk> Subject: Re: ATA DVD playback hanging in physrd Message-ID: <20040901195622.C7FD75D0B@ptavv.es.net> In-Reply-To: Your message of "Wed, 01 Sep 2004 12:22:28 PDT." <41362174.7030900@root.org>
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> Date: Wed, 01 Sep 2004 12:22:28 -0700 > From: Nate Lawson <nate@root.org> > > Kevin Oberman wrote: > >>Date: Fri, 16 Jul 2004 15:50:03 -0700 > >>From: Nate Lawson <nate@root.org> > >>Sender: owner-freebsd-current@freebsd.org > > > >>While playing back a DVD on my Thinkpad, it hangs at some point (2-5 > >>minutes after beginning playback). The player is hung in "physrd" and > >>the drive stops spinning. This hang happens when the drive is in PIO4 > >>or DMA mode. > >> > >>However, starting another process (i.e. cat /dev/acd0) spins up the > >>drive and it works (and the other process begins running again). > >>What's interesting is that I can quickly trigger this hang by starting > >>IO on a completely different channel (i.e. dd if=/dev/ad0 of=/dev/null > >>bs=1m). This indicates that it may be a driver issue since the DVD > >>drive that hangs is on a different channel and irq than the hard > >>drive. > >> > >>Devices: > >>atapci0: <Intel ICH3 UDMA100 controller> port > >>0x1860-0x186f,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 31.1 on pci0 > >>ata0: at 0x1f0 irq 14 on atapci0 > >>ata1: at 0x170 irq 15 on atapci0 > >>[...] > >>ad0: 19077MB <IC25N020ATMR04-0> [41344/15/63] at ata0-master UDMA100 > >>ata1-master: FAILURE - ATAPI_RESET no interrupt > >>acd0: DVDROM <MATSHITADVD-ROM SR-8175> at ata1-master PIO4 > >> > >>The same behavior also happens on my DVD/CDRW drive. > >>ata1-slave: FAILURE - ATAPI_IDENTIFY no interrupt > >>ata1-slave: FAILURE - ATAPI_IDENTIFY no interrupt > >>ata1-master: FAILURE - ATAPI_RESET no interrupt > >>acd0: CDRW <UJDA720 DVD/CDRW> at ata1-master PIO4 > > > > I have been seeing the same thing on my ThinkPad for a couple of > > weeks. It may have been there for longer as I had not heavily used the > > DVD for a while. There have been similar reports from others, but this > > is the most exact match to what I have been seeing. Mine is a Toshiba > > DVD/CDRW (DW-28E) at ata1-master UDMA33. > > I don't know if others reported back on this yet, but the problem is > fixed. I believe Soeren's race fix was the key. Thanks for the note, Nate. I actually heard from someone else (I don't remember who) that this bug had vanished, although the note di not indicate what had fixed it. I suspected either a race or a lost interrupt. In any case, I have not seen the problem for a couple of weeks. (I'm guessing that it was ata-lowlevel.c 1.41 (and patches to most of the rest of ata) in HEAD. Thanks for the note! -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634
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