Kernel 2.6.24-23-rt locks up hard under heavy rt load
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux-rt (Ubuntu) |
Invalid
|
Undecided
|
Unassigned | ||
Hardy |
Won't Fix
|
Medium
|
Alessio Igor Bogani | ||
Jaunty |
Invalid
|
Undecided
|
Unassigned |
Bug Description
Description: Ubuntu 8.04.2
Release: 8.04
linux-rt:
Installed: 2.6.24.23.25
Candidate: 2.6.24.23.25
Version table:
*** 2.6.24.23.25 0
500 http://
100 /var/lib/
2.6.24.22.24 0
500 http://
2.6.24.16.18 0
500 http://
The latest rt-kernel locks up hard under heavy load:
The problem can be reproduced easily by using the cyclictest program (http://
sudo ./cyclictest -p99 -t10 -n -i250
Additional observations:
- The problem got introduced with the upgrade to the rt21 patch - it did not happen with older kernel versions based on previous rt patches.
- The lockup is really hard: there is no output on a netconsole and even the magic sysrequest keys to reboot the system (Alt+SysRQ+b) do not work anymore.
- It also happens to a vanilla kernel with the rt21 patch (I did not try any newer patches yet)
- with a lower realtime priority the system seems to run at least more stable (e.g. sudo ./cyclictest -p95 -t10 -n -i250)
- the problem seems to appear only on multicore systems
Changed in linux-rt: | |
assignee: | nobody → abogani |
status: | New → In Progress |
Changed in linux-rt: | |
importance: | Undecided → Medium |
status: | In Progress → Fix Committed |
The above mentioned problem can also be reproduced with vanilla 2.6.24.7 with the latest rt patch (rt26).