[Swarm-Support] crash caused by malloc

[Yifeng Zhang]

Hi everyone:

 

I've been using Swarm for sometime. However I hit a problem that I couldn't solve recently. I hope that somebody here can help me with it. I am running Swarm-2.2 the latest release under Windows XP. My program crashes and the crash seems to be related to malloc. I am sure that it's not because of insufficient memory. First here's the error message that I got from gdb:

 

Program received signal SIGSEGV, Segmentation fault.
0x0040131d in +[Intermediary createBegin:] (self=0x411440, _cmd=0x411f48,
    aZone=0x107430a8) at intermediary.m:14

 

The crash happens at this statement:

 

obj->last_update_time = SSC_START_UPDATE_TIME;

 

where obj is of type Intermediary*, last_update_time is of type int, and SSC_START_UPDATE_TIME is a constant.

 

Using gdb I also found the memory for obj->last_update_time is not accessible. The reason that I think the crash is related to malloc is that at the time of crashing, I got the following stack from insight:

 

...

+[Intermediary createBegin:]

malloc

 

Also, my program used to crash at some malloc statements written by myself. Then I tried xmalloc, allocBlock. Still the program crashed at these statements. I thought I would avoid the problem by not using dynamic memory allocation and used static arrays instead. But, apparently, the prolem is still there. By the way, my Intermediary class contains a lot of member variables, maybe 50 of them. Does that matter?

 

Any help will be appreciated. Lots of thanks in advance.

 

Yifeng

 

 

 

 

 

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