Public bug reported:
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://ch.archive.ubuntu.com hardy-updates/multiverse Packages
100 /var/lib/dpkg/status
2.6.24.22.24 0
500 http://security.ubuntu.com hardy-security/multiverse Packages
2.6.24.16.18 0
500 http://ch.archive.ubuntu.com hardy/multiverse Packages
The latest rt-kernel locks up hard under heavy load:
The problem can be reproduced easily by using the cyclictest program
(http://git.kernel.org/?p=linux/kernel/git/tglx/rt-tests.git) with the
following command line options:
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
** Affects: linux-rt (Ubuntu)
Importance: Undecided
Status: New
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Kernel 2.6.24-23-rt locks up hard under heavy rt load
https://bugs.launchpad.net/bugs/324275
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