I think I got it. In /lib/udev/rules.d/65-dmsetup.rules there's this
line:
ENV{DM_UUID}=="LVM-*", PROGRAM="/bin/sh -c 'set `lvm lvdisplay -C -o
vg_name,lv_name --noheadings /dev/$name` ; echo $1/$2'",
SYMLINK+="$result"
which is a particularly fragile piece of shell script that doesn't do
any error checking. Replacing it with:
ENV{DM_UUID}=="LVM-*", PROGRAM="/bin/sh -ec 'link=$(lvm lvdisplay -C -o
vg_name,lv_name --noheadings /dev/$name); set -- $link; echo $1/$2'",
SYMLINK+="$result"
will fix the errors and warnings. No more empty or bogus symlinks.
--
rename(/dev//.udev-tmp, /dev//) failed: Invalid cross-device link
https://bugs.launchpad.net/bugs/444563
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