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Date: Wed, 05 Aug 2015 17:42:37 +0200
From: Philippe Gerum <rpm@xenomai.org>
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Subject: Re: [Xenomai] Segfaults and ENOMEM during rt_event_create()
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To: Charles Kiorpes <ckiorpes@gmail.com>, xenomai@xenomai.org

On 05/08/2015 15:09, Charles Kiorpes wrote:
> Hello,
> 
> I am trying to port a fairly large application from Xenomai 2.6.4 to
> Xenomai 3.0-rc6
> 
> Most of the port has been decently painless, but there is one issue I
> can't seem to get past.
> 
> I am consistently getting ENOMEM errors and segfaults in
> libcopperplate.so during rt_event_create(), and always at the same
> spot in my application.
> 
> If a segfault occurrs, the dmesg output from the segfault looks like this:
> [   235.422300] PortProcess[1502]: segfault at f1b3ebeb ip b76c14b7 sp
> bfeae498 error 5 in libcopperplate.so.0.0.0[b76b7000+14000]
> 
> The application uses a large number of named event flag groups.  At
> the time that the error occurs, it is looping to create 32 new named
> event groups.
> 
> I have increased these values in my kernel config:
> CONFIG_XENO_OPT_REGISTRY_NRSLOTS=4096
> CONFIG_XENO_OPT_SYS_HEAPSZ=512
> CONFIG_XENO_OPT_PRIVATE_HEAPSZ=128
> CONFIG_XENO_OPT_SHARED_HEAPSZ=128
> 
> When I dig through the /proc/xenomai filesystem, I see that:
> - I am only using 383/4096 registry slots
> - My system heap is about half full (284160KB free of 524288KB)
> - My shared and private heaps are basically empty
> 
> My application is launched with --mem-pool-size=400000.  The main heap
> (in /registry/user/session/system) has about 220KB used at the point
> that the error occurs.
> Increasing the mem-pool-size does not change the behavior.  I have
> also tried further increasing the values of my system (1024), private
> (256), and shared (256) heapsizes, with no effect.
> 
> Obviously I've missed something, but I can't figure out where the
> error is occurring.
> 
> System details:
> OS: Debian Jessie 32-bit
> Kernel: 3.18.12 - patched using Xenomai 3.0-rc6
> System: Intel Xeon W3503 (x86 architecture)
> I-Pipe version 1
> 

Any improvement with this patch in?

commit 574c8e2edb99ff523e765cdb8749dd5259784627
Author: Philippe Gerum <rpm@xenomai.org>
Date:   Wed Aug 5 16:08:23 2015 +0200

    lib/cobalt: fix private event state accessor

diff --git a/lib/cobalt/internal.c b/lib/cobalt/internal.c
index 348ca14..62ecb4a 100644
--- a/lib/cobalt/internal.c
+++ b/lib/cobalt/internal.c
@@ -426,7 +426,7 @@ struct cobalt_event_state
*get_event_state(cobalt_event_t *event)
 {
 	return event->flags & COBALT_EVENT_SHARED ?
 		cobalt_umm_shared + event->state_offset :
-		cobalt_umm_shared + event->state_offset;
+		cobalt_umm_private + event->state_offset;
 }

 int cobalt_event_init(cobalt_event_t *event, unsigned int value,



-- 
Philippe.