Bug#867368: systemd-udevd: delays boot for 2+ minutes when LVM PV is inside a LV

[Christian Schwamborn]

I'm experiencing the same behavior with a lvm pv on top of a md mirror:

Nov  2 22:03:13 zero systemd-udevd[515]: seq 4167 
'/devices/virtual/block/md4' is taking a long time

pvscan
   PV /dev/sda   VG BACKUP0         lvm2 [9.10 TiB / 98.00 GiB free]
   PV /dev/md4   VG MAIN0           lvm2 [9.10 TiB / 273.93 GiB free]
   Total: 2 [18.19 TiB] / in use: 2 [18.19 TiB] / in no VG: 0 [0   ]


cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] 
[raid4] [raid10]

md4 : active raid1 sdc4[1] sdb4[0]
       9765778432 blocks super 1.2 [2/2] [UU]
       bitmap: 4/73 pages [16KB], 65536KB chunk

I first thought, the delay has something to do with the network setup, 
as it appears during the 'Raise network interfaces' message when systemd 
counts about two and a half minute before continuing, but I think that's 
more a coincidence.