[Bug 693594] Re: cgroup-bin should not move kthreadd into a default cgroup

2013-10-30 Thread Jon Bernard 
** Changed in: libcgroup (Ubuntu)
 Assignee: Jon Bernard (jbernard) = (unassigned)

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Title:
  cgroup-bin should not move kthreadd into a default cgroup

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Re: [Bug 693594] Re: cgroup-bin should not move kthreadd into a default cgroup

2012-03-05 Thread Serge Hallyn 
 You're absolutely right, I will allocate time this week to put together
 a new upstream release.
 
 Serge, would have have time to help me test and provide feedback?

I will be out the remainder of this week.  I can test it next week
though.

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Title:
  cgroup-bin should not move kthreadd into a default cgroup

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[Bug 693594] Re: cgroup-bin should not move kthreadd into a default cgroup

2012-03-04 Thread Jon Bernard 
You're absolutely right, I will allocate time this week to put together
a new upstream release.

Serge, would have have time to help me test and provide feedback?

Jon

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Title:
  cgroup-bin should not move kthreadd into a default cgroup

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[Bug 693594] Re: cgroup-bin should not move kthreadd into a default cgroup

2012-03-03 Thread Rioting_Pacifst 
This bug has quite a few nasty symptoms (breaks suspend on SMP machines,
etc) and I guess cgroups are going to get more popular as people try the
superpatch so could we get one of the following into 12.04 please:

1)do not move all tasks into a default cgroup 
comment CREATE_DEFAULT=yes out and uncomment CREATE_DEFAULT=no in 
/etc/default/cgconfig

2)putting the following in /etc/cgconfig.conf
group sysdefault {
cpu {
cpu.rt_runtime_us = 95;
}
}

3) Add a rule so that [kthreadd] is never put in the default group

4) Changing startup script to not move ktreadadd

I think creating a superflous default group is stupid anyway so the
first fix is by far the best.

Upstream have also release 0.38 but nothing in the changelog seems
relevant.

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Title:
  cgroup-bin should not move kthreadd into a default cgroup

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Re: [Bug 693594] Re: cgroup-bin should not move kthreadd into a default cgroup

2012-03-03 Thread Serge Hallyn 
Jon,

if you could do these soon in the Debian package, I think we should
still be able to get it into precise.

Rioting_Pacifst,

note that we generally recommend using cgroup-lite when possible.

Quoting Rioting_Pacifst (693...@bugs.launchpad.net):
 This bug has quite a few nasty symptoms (breaks suspend on SMP machines,
 etc) and I guess cgroups are going to get more popular as people try the
 superpatch so could we get one of the following into 12.04 please:
 
 1)do not move all tasks into a default cgroup 
 comment CREATE_DEFAULT=yes out and uncomment CREATE_DEFAULT=no in 
 /etc/default/cgconfig
 
 2)putting the following in /etc/cgconfig.conf
 group sysdefault {
 cpu {
 cpu.rt_runtime_us = 95;
 }
 }
 
 3) Add a rule so that [kthreadd] is never put in the default group
 
 4) Changing startup script to not move ktreadadd
 
 I think creating a superflous default group is stupid anyway so the
 first fix is by far the best.
 
 Upstream have also release 0.38 but nothing in the changelog seems
 relevant.
 
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 Title:
   cgroup-bin should not move kthreadd into a default cgroup
 
 Status in “libcgroup” package in Ubuntu:
   Confirmed
 
 Bug description:
   Steps to reproduce:
   1. Install cgroup-bin from universe on a stock Lucid machine (I've only 
 tested amd64, but I suspect it shouldn't matter)
   2. Load an arbitrary module (e.g. modprobe rds)
   3. Unload the module loaded in (2) (e.g. rmmod rds)
 
   The 'rmmod' process will hang unkillably in the kernel.
 
   Here's an example `dmesg` output from the hung-task watchdog for
   rmmod:
 
    INFO: task rmmod:1608 blocked for more than 120 seconds.
    echo 0  /proc/sys/kernel/hung_task_timeout_secs disables this message.
    rmmod D  0  1608   1440 0x
      880014245c78 0082 00015bc0 00015bc0
      880014804890 880014245fd8 00015bc0 8800148044d0
      00015bc0 880014245fd8 00015bc0 880014804890
     Call Trace:
     [81541b6d] schedule_timeout+0x22d/0x300
     [812b8716] ? rb_erase+0xd6/0x160
     [81052a10] ? __dequeue_entity+0x30/0x50
     [8154178b] wait_for_common+0xdb/0x180
     [8105a220] ? default_wake_function+0x0/0x20
     [815418ed] wait_for_completion+0x1d/0x20
     [8107fe55] flush_cpu_workqueue+0x65/0xa0
     [8107ff10] ? wq_barrier_func+0x0/0x20
     [81080754] flush_workqueue+0x54/0x80
     [810b5b24] __stop_machine+0xf4/0x120
     [8109d8c0] ? __try_stop_module+0x0/0x50
     [810b5d7e] stop_machine+0x3e/0x60
     [8109cbd4] ? find_module+0x34/0x70
     [8109e1ee] sys_delete_module+0x17e/0x270
     [810121b2] system_call_fastpath+0x16/0x1b
 
   The process is waiting on kstop/0 to wake up and service the stop_cpu
   workqueue work item that it has queued. kstop/0 is marked as
   TASK_RUNNABLE, but doesn't appear to ever be getting scheduled:
 
   $ ps -f 1609
   UIDPID  PPID  C STIME TTY  STAT   TIME CMD
   root  1609 2  0 14:47 ?R  0:00 [kstop/0]
 
   $ cat /proc/1609/stack
   [8107fb6a] worker_thread+0xda/0x110
   [81084206] kthread+0x96/0xa0
   [810131ea] child_rip+0xa/0x20
   [] 0x
 
   I tracked this behavior down and reported it to the upstream kernel,
   but they say it's not a bug and that it's libcgroup's fault for moving
   kthreadd into a cgroup without RT privs:
   https://lkml.org/lkml/2011/1/5/53
 
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Title:
  cgroup-bin should not move kthreadd into a default cgroup

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