[Bug 1185394] Re: systemd-udev fails when processing many logical volumes on boot

[Stefan Bader]

(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 at 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 at 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

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https://bugs.launchpad.net/bugs/1185394

Title:
  systemd-udev fails when processing many logical volumes on boot

Status in “systemd” package in Ubuntu:
  In Progress

Bug description:
  With recent systemd/udev updates in Saucy I see problems when /dev
  gets moved to the real root. It seems to be related to running
  vgscan/vgchange through watershed by systemd-udevd. The symptoms
  include a crash of one systemd-udevd process and several messages
  about systemd-udevd (or childs of it) not finding files in /dev.

  Setup:

  sda: contains the root fs (no separate /boot) and a swap partition
  sdb: contains vg1 with /home
  sdc and sdd: contain vg2 with 31 LVs, one of them mounted to /home/isos

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