The issue has been isolated to the single line change of launchpad
revision 2760 (while revision 2761 edits the same line again, the
results are the same).
Specifically: in the file rules.d/60-persistent-storage.rules, this line:
ACTION=="add", KERNEL=="sr*", ATTR{events_poll_msecs}=="0",
ATTR{events_poll_msecs}="2000"
works fine, but when it is changed to this (2760):
ACTION=="add", KERNEL=="sr*", ATTR{events_poll_msecs}=="-1",
ATTR{events_poll_msecs}="2000"
or this (2761 and subsequent):
ACTION=="add", ATTR{removable}=="1", ATTR{events_poll_msecs}=="-1",
ATTR{events_poll_msecs}="2000"
the problem exists.
Why? The rule is for "sr" or "removeable" devices. The hard disk is an
"sd" device. Why does the change result in issues with the hard disk?
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https://bugs.launchpad.net/bugs/986654
Title:
disk I/O race condition after update
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