On Tue, Jul 29, 2008 at 11:57 PM, Tvrtko A. Ursulin <tvrtko@xxxxxxxxxxx> wrote: > On Wednesday 30 July 2008 00:20:11 Alan Cox wrote: >> > Jul 29 21:10:03 media kernel: [353032.319013] sr 2:0:0:0: [sr0] unaligned >> > transfer Jul 29 21:10:03 media kernel: [353032.319013] sr 2:0:0:0: [sr0] >> > unaligned transfer >> >> This is coming from the scsi/block layer and definitely isn't good. >> Doesn't directly look like a libata bug but seems to be higher up the >> stack. What software is triggering this ? > > I tried to reproduce it now but could not. > > After a fresh boot into 2.6.26, I first tried mounting the DVD which was fine. Then I ran lsdvd which also worked and finally mplayer without any problems. In > contrast to that yesterday I ran my playdvd.pl (http://www.ursulin.net/2008/06/effectively-using-mplayer-within-mythtv/) script from within MythTV and it > exited immediately. It looked like either it triggered that failure without any delay or subsystem was already in that failure mode by simple DVD insertion. > When ran directly lsdvd would exit being unable to open /dev/dvd (/dev/scdo). Unfortunately I didn't debug it further at the time. > > The only difference is that yesterday box had an uptime of couple of days while this morning it was completely fresh. Unless mounting the disc before > everything else somehow stabilised something. Hm let me do another reboot... no, still can't reproduce it. > > One interesting thing, sometimes it detects drive capabilities like this: > [ 3.498951] sr0: scsi3-mmc drive: 62x/62x writer dvd-ram cd/rw xa/form2 cdda tray > > And sometimes like this: > [ 3.514104] sr0: scsi3-mmc drive: 48x/48x writer dvd-ram cd/rw xa/form2 cdda tray > > Later I think is correct according to drive datasheet. > > I will keep 2.6.26 running and see if the problem comes back in following days. > > Tvrtko > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > I usually see these errors with mplayer i.g. insert a dvd then press play instead of waiting for the dvd to settle down. -- Justin P. Mattock -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
