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 = 950000; > } > } > > 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. > > -- > You received this bug notification because you are subscribed to > libcgroup in Ubuntu. > https://bugs.launchpad.net/bugs/693594 > > 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 0000000000000000 0 1608 1440 0x00000000 > ffff880014245c78 0000000000000082 0000000000015bc0 0000000000015bc0 > ffff880014804890 ffff880014245fd8 0000000000015bc0 ffff8800148044d0 > 0000000000015bc0 ffff880014245fd8 0000000000015bc0 ffff880014804890 > Call Trace: > [<ffffffff81541b6d>] schedule_timeout+0x22d/0x300 > [<ffffffff812b8716>] ? rb_erase+0xd6/0x160 > [<ffffffff81052a10>] ? __dequeue_entity+0x30/0x50 > [<ffffffff8154178b>] wait_for_common+0xdb/0x180 > [<ffffffff8105a220>] ? default_wake_function+0x0/0x20 > [<ffffffff815418ed>] wait_for_completion+0x1d/0x20 > [<ffffffff8107fe55>] flush_cpu_workqueue+0x65/0xa0 > [<ffffffff8107ff10>] ? wq_barrier_func+0x0/0x20 > [<ffffffff81080754>] flush_workqueue+0x54/0x80 > [<ffffffff810b5b24>] __stop_machine+0xf4/0x120 > [<ffffffff8109d8c0>] ? __try_stop_module+0x0/0x50 > [<ffffffff810b5d7e>] stop_machine+0x3e/0x60 > [<ffffffff8109cbd4>] ? find_module+0x34/0x70 > [<ffffffff8109e1ee>] sys_delete_module+0x17e/0x270 > [<ffffffff810121b2>] 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 > UID PID PPID C STIME TTY STAT TIME CMD > root 1609 2 0 14:47 ? R 0:00 [kstop/0] > > $ cat /proc/1609/stack > [<ffffffff8107fb6a>] worker_thread+0xda/0x110 > [<ffffffff81084206>] kthread+0x96/0xa0 > [<ffffffff810131ea>] child_rip+0xa/0x20 > [<ffffffffffffffff>] 0xffffffffffffffff > > 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 > > To manage notifications about this bug go to: > https://bugs.launchpad.net/ubuntu/+source/libcgroup/+bug/693594/+subscriptions -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to libcgroup in Ubuntu. https://bugs.launchpad.net/bugs/693594 Title: cgroup-bin should not move kthreadd into a default cgroup To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libcgroup/+bug/693594/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs