[Klone-users] klone segfaults

[Mark Richards]

Klone 2.0.0
Dev env: 2.6.18-8.1.3.el5 #1 SMP Mon Apr 30 19:55:44 EDT 2007 i686 i686 
i386 GNU/Linux
cross-compiling: cris-axis
target: 2.6.19 #4 Wed Jan 30 19:20:26 EST 2008 cris unknown

Klone has been extremely reliable, however I've been tracking down an 
issue with sqlite3 which led me to other issues and eventually to a huge 
rewrite of a main shared library (called aemutils) that provides a 
sqlite3 wrapper and other utilities to my klone application.

As a result, apparently of some changes along the way, klone breaks 
(other apps that use the re-written shared lib do not - and they use the 
same call that klone breaks on).

The header file of aemutils.so contains a structure defined:

struct _sysinfo
{
     int nSiteNr;
     int nEmailTimeout;
     int is_debug;
}

There are many functions in the main source of my shared library that 
reference the structure.  So at the top of the shared lib source I do this:

	struct _sysinfo sysinfo;

which makes sysinfo public.


This same _sysinfo structure is defined in the header file of my 
libkloneaemlib which is included in my klone build:

	WEBAPP_LDADD = $(TOP)/src/libkloneaemlib.a

index.kl1 references the structure thusly:

	extern struct _sysinfo sysinfo;

When my index.kl1 starts and hits this code it segfaults:

# kloned (pid 792) segfaults for page address 00082000 at pc 00097198

If I don't define the extern struct _sysinfo sysinfo and remove a 
statement that makes an assignment to an element of the structure, klone 
works.  However, if I then call a function in the aemutils.so that does 
the same thing, klone breaks again.

Although I made lots of changes to aemitils.so I haven't changed 
anything with this particular structure or the way it's handled in 
aemutils.so (or for that matter, klone).  Therefore I am at a loss to 
explain, particularly as it works OK with other apps.

To see if it was a matter of klones thread model, I set it to iterative. 
  No difference.

Maybe this is a stupid coding problem.

Help :)