Comment 5 for bug 89135

Also this may be a side effect of gdb attaching to the process, but this is the stacktrace I see every time I connect to init on that host (did not change over ~10 attempts):

#0 0x00007fc94fc9b5ae in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007fc94fc2437e in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x00007fc94fc1c67c in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#3 0x00007fc94fc53635 in fork () from /lib/x86_64-linux-gnu/libc.so.6
#4 0x00007fc950bed605 in ?? ()
#5 <signal handler called>
#6 0x00007fc94fbd9d05 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#7 0x00007fc94fbddab6 in abort () from /lib/x86_64-linux-gnu/libc.so.6
#8 0x00007fc94fc12d7b in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#9 0x00007fc94fc1cbb6 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#10 0x00007fc94fc1fe78 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#11 0x00007fc94fc2231e in malloc () from /lib/x86_64-linux-gnu/libc.so.6
#12 0x00007fc9507b2f95 in nih_alloc () from /lib/libnih.so.1
#13 0x00007fc9507b36ed in nih_strndup () from /lib/libnih.so.1
#14 0x00007fc9507bc921 in nih_log_message () from /lib/libnih.so.1
#15 0x00007fc950bed76a in ?? ()
#16 <signal handler called>
#17 0x00007fc9507b4500 in nih_list_add_after () from /lib/libnih.so.1
#18 0x00007fc9507b64b4 in nih_io_handle_fds () from /lib/libnih.so.1
#19 0x00007fc9507b9a03 in nih_main_loop () from /lib/libnih.so.1
#20 0x00007fc950bedf2d in main ()

Strace suggests it's waiting on a lock:

$ sudo strace -p 1
Process 1 attached - interrupt to quit
futex(0x7fc94ff351c0, FUTEX_WAIT_PRIVATE, 2, NULL^C <unfinished ...>
Process 1 detached