Public bug reported:
I have a ML370 G4 and I'm having some stability issues.
Once in a while (about every day) the server would start to run slower and
slower, until it hung.
During the running slower I found out that I could not kill -9 processes.
Furthermore the display shows the following error for some processes: task hung
for more than 120 seconds.
I have changed some stuff to solve this issue, but have not solved it yet:
- I started out whith Fedora F16, but soon decided that I'd feel more for
ubuntu (12.04 LTS 64 bit) and hoped to get rid by changing the distro at the
same time. After changing to Ubuntu 12.04 the server run stable for about 3
days. Then the issues started again.
- I changed from btrfs to ext4 (created ext4 partitions, copied and deinstalled
btrfs-tools). The issues remained.
- I found that there were many SSH attempts (aout 14000 in one day from one
IP). I filtered them out with IPTables. Since then the performance of the
server is
very good, but the issues remained.
- I have ran a memory test (choose memtest during boot from grub menu). It ran
for about 8 hours en gave no errors.
- I have not yet ran a CPU test, but I'm not convinced that this might be an
issue.
- I changed to the older kernel 3.2.0.29 (the one that run stable for 3 days).
The server ran stable for 3 days, but the showed the same issue (so less often,
but the issues remained).
- At this moment I have installed 3.4.0-03 and I'm checking to see how long
that will last.
- I have also changed the kernel settings so that hung tasks initiate a kernel
panic (kernel.hung_task_panic>0), and that kernel panic initiate a reboot
(kernel.panic>0).
- And I have blacklisted te btrfs kernel module (it was still loaded for some
unknown reason).
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: 3.2.0.32 hung kernel task
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https://bugs.launchpad.net/bugs/1077688
Title:
Kernel hung task
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