Messages in this thread | | | Date | Sat, 3 Sep 2011 17:14:56 -0500 | From | Jonathan Nieder <> | Subject | [regression] CD-ROM polling blocks suspend on some machines (Re: [PATCH 1/2] cdrom: always check_disk_change() on open) |
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Hi,
Various people[1] have been noticing a race (or races?) in which the cdrom_id and scsi_id programs from udev can get stuck in the D state if udev doesn't sleep a little while before running them. This prevents the machine from suspending. The problem was discovered with Debian kernels
2.6.39-1 2.6.39-2 3.0.0-1
and was not experienced with kernel
2.6.38-5
(These kernels are closely based on v2.6.39, v2.6.39.1, v3.0, and v2.6.38.5, respectively.) Reverting commit bf2253a6f00e (cdrom: always check_disk_change() on open, 2011-04-29) seems to avoid trouble.
One common theme seems to be DVD drives. Details at [1].
Known problem? Any ideas for tracking it down?
Looking forward to your thoughts, Jonathan
[1] <http://bugs.debian.org/628600>. Submitters cc-ed.
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