Red Hat Bugzilla – Bug 136010
issue threads / SCHED_RR
Last modified: 2015-01-04 17:10:46 EST
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Description of problem:
We have developped a simple program for testing the creation of
threads in the SCHED_RR class on multi-processors system.
We have found an issue on IA32 architecture. Some threads do not get
Tests shown that the problem is reproducible on both NPTL and
LinuxThreads, on various kernel 2.6.x kernel version (vanilla or
Red-Hat tailored), as well various glibc 2.3.x version.
Whether the proposed test is broken, or there is an issue somewhere.
In that latter case, we believe this could be in the kernel.
The test /test_schedrr3.c.gz/ can be downloaded from the NPTL Bull
Open Source forum.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. download the /test_schedrr3.c.gz/, unzip and compile.
2. run the program. Start for instance 25 threads at prio 3 on a SMP
Actual Results: The test times out showing the some threads didn't start.
Expected Results: Theoritically, it should PASS. That is all the
threads are created and running in the SCHED_RR class at the given
The test should be run on a multi-processor (>=2 CPUs) machine.
On a single-CPU machine, it must TIMEOUT.
Fedora Core 2 has now reached end of life, and no further updates will be
provided by Red Hat. The Fedora legacy project will be producing further kernel
updates for security problems only.
If this bug has not been fixed in the latest Fedora Core 2 update kernel, please
try to reproduce it under Fedora Core 3, and reopen if necessary, changing the
product version accordingly.