Red Hat Bugzilla – Bug 438414
directory /proc/PID/task contains "0" entries
Last modified: 2009-01-09 02:44:13 EST
Description of problem:
Under what I'll call moderate process load (I suspect frysk's testsuite actually
generates high processor/task load) the directory /proc/PID/task is found to
contain "0" named (the string zero) dirent entries.
Here's a trace lifted from running frysk's testsuite:
Running testTerminateKillINT(frysk.proc.TestTaskTerminateObserver) ...WARNING:
00:00:48.970 11317.11317 frysk.sys.proc.ProcBuilder: /proc/13589/task contains
bad pid: 0
this is new behavior and is occurring on:
$ uname -a
Linux morgan 18.104.22.168-34.fc8 #1 SMP Wed Mar 12 16:51:49 EDT 2008 x86_64 x86_64
Possibly caused by PID namespaces being enabled. They are disabled starting with
22.214.171.124-63, so see if that fixes this bug.
kernel-126.96.36.199-63.fc8 has been submitted as an update for Fedora 8
kernel-188.8.131.52-64.fc8 has been submitted as an update for Fedora 8
(In reply to comment #1)
> Possibly caused by PID namespaces being enabled. They are disabled starting with
> 184.108.40.206-63, so see if that fixes this bug.
What do you mean by PID namespaces? Would there be a pointer to the patch?
CONFIG_PID_NS in the upstream kernel enables a containers feature..
bool "PID Namespaces (EXPERIMENTAL)"
depends on NAMESPACES && EXPERIMENTAL
Suport process id namespaces. This allows having multiple
process with the same pid as long as they are in different
pid namespaces. This is a building block of containers.
The containers stuff still seems to be in a state of flux, and afaik there's no
distro integration done yet, so this feature being disabled should have no
Does kernel -64 fix this bug?
kernel-220.127.116.11-64.fc8 has been pushed to the Fedora 8 stable repository. If problems still persist, please make note of it in this bug report.
I've noticed regressions via the Frysk testsuite:
Linux localhost.localdomain 18.104.22.168-85.fc8 #1 SMP Sat Apr 19 11:18:09 EDT 2008
x86_64 x86_64 x86_64 GNU/Linux
/proc/$$/task contains bad pid (pid 0)
See comment #9, still seeing the problem.
Still happening in 22.214.171.124-10?
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