[ ssic-linux-Bugs-2782858 ] thread group fails to migrate

Bugs item #2782858, was opened at 2009-04-28 09:39
Message generated for change (Comment added) made by rogertsang
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Category: Process Management
Group: v1.9.1
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Roger Tsang (rogertsang)
Assigned to: Nobody/Anonymous (nobody)
Summary: thread group fails to migrate

Initial Comment:
[created from discussion http://article.gmane.org/gmane.linux.cluster.ssic.devel/6010]

When running the attached test program the origin node displays the following messages:

add_thread_group:Cannot move process 438181 (calc) - cannot find all shares
add_thread_group: group(438181)/share imbalance 4/1

To build attached test program
# gcc -o calc pthread-test.c -pthread -lm

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>Comment By: Roger Tsang (rogertsang)
Date: 2009-04-28 09:42

Message:
from discussion
http://article.gmane.org/gmane.linux.cluster.ssic.devel/6011

John Huges wrote:
I've also seen another error when trying to migrate the process:

$ migrate 1 395359 
migrate: process 395359 has exited/is exiting
$ dmesg | tail -1
add_thread_group:Cannot move process 394990 (gdm) has different tgid
394990 (expected 395359)

It seems confused about which threads belong to which processes.

I get the same behaviours with a 2.6.11 kernel based on CVS as of 16
March.

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