Comment 26 for bug 1680502

Hmm - 73 zombies?! And systemd is in an uninterruptible sleep. It moreover has not accumulated any time since I first ran top, so I'd say it's still in the *same* uninterruptible sleep... for at least 14 minutes. Also, the number of zombies has been increasing, as of right now, it's 187.
I don't have the ability to live debug this kernel, but I'm morally convinced that if we could trace the resource systemd is waiting on,

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top - 08:34:16 up 3 days, 11:44, 2 users, load average: 10.00, 9.99, 8.69
Tasks: 472 total, 5 running, 280 sleeping, 0 stopped, 187 zombie
%Cpu(s): 1.2 us, 0.4 sy, 0.1 ni, 98.1 id, 0.2 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 8140712 total, 1037684 free, 336272 used, 6766756 buff/cache
KiB Swap: 7781712 total, 7495516 free, 286196 used. 7137692 avail Mem

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
 2527 arlie 20 0 0 0 0 Z 106.7 0.0 60:36.87 compiz
    1 root 20 0 120072 3980 2132 D 0.0 0.0 0:06.37 systemd
    2 root 20 0 0 0 0 S 0.0 0.0 0:00.02 kthreadd

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And look at this, we have a defunct pager!!

arlie@ansuz$ ps -Fa -p1
UID PID PPID C SZ RSS PSR STIME TTY TIME CMD
root 1 0 0 30018 3980 3 Apr15 ? 00:00:06 /sbin/init splash
arlie 24386 1 0 0 0 3 08:15 pts/2 00:00:00 [pager] <defunct>
arlie 24859 24139 0 9342 3284 3 08:37 pts/2 00:00:00 ps -Fa -p1

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I can't get the WCHAN for systemd out of ps. Sorry.

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arlie@ansuz$ ps -e -o pid,wchan=WIDE-WCHAN-COLUMN -o comm | head
  PID WIDE-WCHAN-COLUMN COMMAND
    1 - systemd
    2 - kthreadd
    3 - ksoftirqd/0