AIUI udevcomplete_all will clean up any hanging vgchange -a y processes,
but it won't solve the problem. udev is supposed to, in response to the
lvs created by vgchange, call 55-dm again, and thereby create the
/dev/{vg}/{lv} links (before calling dmsetup udevcomplete ${DM_COOKIE}
to un-hang vgchange). Those links won't get created.
(I've tested this. In a case where /dev/schroots/kvm-1 did not get
created and vgchange was hanging, I did dmsetup udevcomplete
${DM_COOKIE}" (using the cookie shown by ipcs -a). vgchange happily
went away, /dev/schroots/kvm-1 did not show up.
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https://bugs.launchpad.net/bugs/802626
Title:
vgchange may deadlock in initramfs when VG present that's not used for
rootfs
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