[Bug 1196295] Re: lxc-start enters uninterruptible sleep

[Pavel Bennett]

apport information

** Tags added: apport-collected

** Description changed:

  After running and terminating around 6000 containers overnight,
  something happened on my box that is affecting every new LXC container I
  try to start. The DEBUG log file looks like:
  
        lxc-start 1372615570.399 WARN     lxc_start - inherited fd 9
        lxc-start 1372615570.399 INFO     lxc_apparmor - aa_enabled set to 1
  
        lxc-start 1372615570.399 DEBUG    lxc_conf - allocated pty '/dev/pts/302' (5/6)
        lxc-start 1372615570.399 DEBUG    lxc_conf - allocated pty '/dev/pts/303' (7/8)
        lxc-start 1372615570.399 DEBUG    lxc_conf - allocated pty '/dev/pts/304' (10/11)
        lxc-start 1372615570.399 DEBUG    lxc_conf - allocated pty '/dev/pts/305' (12/13)
        lxc-start 1372615570.399 DEBUG    lxc_conf - allocated pty '/dev/pts/306' (14/15)
        lxc-start 1372615570.399 DEBUG    lxc_conf - allocated pty '/dev/pts/307' (16/17)
        lxc-start 1372615570.399 DEBUG    lxc_conf - allocated pty '/dev/pts/308' (18/19)
        lxc-start 1372615570.399 DEBUG    lxc_conf - allocated pty '/dev/pts/309' (20/21)
        lxc-start 1372615570.399 INFO     lxc_conf - tty's configured
        lxc-start 1372615570.399 DEBUG    lxc_start - sigchild handler set
        lxc-start 1372615570.399 INFO     lxc_start - 'vm-59' is initialized
        lxc-start 1372615570.404 DEBUG    lxc_start - Not dropping cap_sys_boot or watching utmp
  
        lxc-start 1372615570.404 INFO     lxc_start - stored saved_nic #0
  idx 12392 name vethP59
  
        lxc-start 1372615570.404 INFO     lxc_conf - opened
  /home/x/vm/vm-59.hold as fd 25
  
  It stops there. In 'ps faux', it looks like:
  
  root     31621  0.0  0.0  25572  1272 ?        D    14:06   0:00  \_
  lxc-start -n vm-59 -f /tmp/tmp.fG6T6ERZpS -l DEBUG -o
  /home/x/lxcdebug/vm-59.txt -- /usr/sbin/dropbear -F -E -m
  
  On a successful LXC run (prior to the server getting into this state),
  this hangs just before:
  
        lxc-start 1372394092.208 DEBUG    lxc_cgroup - checking '/' (rootfs)
        lxc-start 1372394092.208 DEBUG    lxc_cgroup - checking '/sys' (sysfs)
        lxc-start 1372394092.208 DEBUG    lxc_cgroup - checking '/proc' (proc)
        lxc-start 1372394092.208 DEBUG    lxc_cgroup - checking '/dev' (devtmpfs)
        lxc-start 1372394092.208 DEBUG    lxc_cgroup - checking '/dev/pts' (devpts)
        lxc-start 1372394092.208 DEBUG    lxc_cgroup - checking '/run' (tmpfs)
        lxc-start 1372394092.208 DEBUG    lxc_cgroup - checking '/' (btrfs)
        lxc-start 1372394092.208 DEBUG    lxc_cgroup - checking '/sys/fs/cgroup' (tmpfs)
        lxc-start 1372394092.208 DEBUG    lxc_cgroup - checking '/sys/fs/cgroup/cpuset' (cgroup)
        lxc-start 1372394092.208 INFO     lxc_cgroup - [1] found cgroup mounted at '/sys/fs/cgroup/cpuset',opts='rw,relatime,cpuset,clone_children'
        lxc-start 1372394092.208 DEBUG    lxc_cgroup - get_init_cgroup: found init cgroup for subsys (null) at /
  
  It looks like a resource leak, but I'm not yet sure of what that would
  be.
  
  If it matters, I SIGKILL my lxc-start processes instead of using lxc-
  stop. Could that have any negative implications?
  
- Oh, and cgroups had almost 6000 entries for VMs that are long dead (I'm
- guessing it's due to my SIGKILL). I've run cgclear and my
- /sys/fs/cgroup/*/ dirs are now totally empty, but the new containers
- still hang.
+ Oh, and cgroups had almost 6000 entries for VMs that are long dead (I'm guessing it's due to my SIGKILL). I've run cgclear and my /sys/fs/cgroup/*/ dirs are now totally empty, but the new containers still hang.
+ --- 
+ Architecture: amd64
+ DistroRelease: Ubuntu 13.04
+ MarkForUpload: True
+ Package: lxc 0.9.0-0ubuntu3.3
+ PackageArchitecture: amd64
+ ProcEnviron:
+  TERM=screen
+  PATH=(custom, no user)
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
+ Uname: Linux 3.8.0-25-generic x86_64
+ UserGroups:

** Attachment added: "Dependencies.txt"
   https://bugs.launchpad.net/bugs/1196295/+attachment/3722559/+files/Dependencies.txt

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Title:
  lxc-start enters uninterruptible sleep

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