[Xenomai-help] Segmentation error by heavy dynamic RT_QUEUE usage

["Petr Cervenka" <grugh@domain.hid>]

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Hello,
I wanted to make an small example to find the kernel panic (and I failed with it). But during my tests I found another possible error.
I made a small application (as netbeans c++ project) with two tasks:
1) server task with its RT_QUEUE waiting for a request.
2) client task which creates RT_QUEUES for response and sends requests to the server task
>From time to time I get an segmentation error.
It's always in the server task, when the server binds the clients queue, allocates a message buffer in it.
It seems when the server starts to work with this buffer, the client could already close the queue.
But this shouldn't be possible, because normally any attempt to close a queue binded by someone else ends with -EBUSY error.
The error needs some time to produce and 2 CPUs (cores). One for server and one for client.
My configuration(s):
Athlon XP 2600GHz  X86_64
kernel 2.6.24 (and 2.6.25.11)
adeos 2.6.24 2.0-03 (and 2.0-07)
xenomai 2.4.1 and 2.4.4
I'm sending also examples of the execution script and proper input.txt file
both of them should be much longer (input.txt could be several MB)!!!!
In the attachement there is also disassemble of my executable
And finally, one of the segmentation error messages:
[ 2553.818731] QT_SERVER[5919]: segfault at 2aaaaac96800 rip 4022b5 rsp 4000fe00 error 6
But there are more types, but allways when working with the allocated send buffer.
I know, I'm annoying, but I can't help myself.... ;-)
Petr


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#!/bin/sh

../dist/Debug/GNU-Linux-x86/queuetest < input2.txt
../dist/Debug/GNU-Linux-x86/queuetest < input2.txt
../dist/Debug/GNU-Linux-x86/queuetest < input2.txt

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send 490000
recv
echo 490000
sleep 100
send 490000
recv
echo 490000
sleep 100
send 490000
recv
echo 490000
sleep 100
send 490000
recv
echo 490000
sleep 100

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