Comment 5 for bug 1185394

(1) Addition, seems I managed to see one rare-time segfault on a normal boot (but only one so far on many reboots).

(3) Ok, finally I got it! Updated udev/libudev to 202-0ubuntu10(amd64) to be able to have matching ddebs and disabled mounting /home and /home/isos as otherwise the plymouth bug prevented me to access /run after the failure...

Core was generated by `/lib/systemd/systemd-udevd --daemon --resolve-names=never'.
Program terminated with signal 11, Segmentation fault.
#0 udev_monitor_allow_unicast_sender (
    udev_monitor=udev_monitor@entry=0x6e0110, sender=0x0)
    at src/libudev/libudev-monitor.c:311
311 src/libudev/libudev-monitor.c: No such file or directory.
(gdb) where
#0 udev_monitor_allow_unicast_sender (
    udev_monitor=udev_monitor@entry=0x6e0110, sender=0x0)
    at src/libudev/libudev-monitor.c:311
#1 0x00000000004063fe in worker_new (event=0x72b5e0) at src/udev/udevd.c:210
#2 event_run (event=0x72b5e0) at src/udev/udevd.c:437
#3 event_queue_start (
    udev=<error reading variable: can't compute CFA for this frame>)
    at src/udev/udevd.c:586
#4 main (argc=<optimized out>, argv=<optimized out>) at src/udev/udevd.c:1448