C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  SIGSEGV in malloc()          C++Talk.NET Forum Index -> C Language View previous topic :: View next topic   Author Message Joakim Hove Guest Posted: Mon May 07, 2007 9:12 am    Post subject: SIGSEGV in malloc() Hello, in my application I have a typedefed struct: typedef struct { double d1; int i1; /* I have simplified the object here. */ } data_ptr_type; I allocate storage for such object many times in my application, and at some point in time (repeatedly at the same spot, but seemingly random to me), the application fails with a SIGSEGV at: data_ptr_type * data = malloc(sizeof *data); To me it seems quite illogical that the malloc implementation should be able to die with a SIGSEGV(?) - either it should return a pointer to freshly allocated storage, or if that is not possible it should return NULL. Can this be a sign of a bug in the malloc() implementation - I know that sounds unlikely but?? My system is: RedHat Enterprise Linux gcc-3.4.6 64 bit computer, but comiled with -m32 switch. Any suggestions? Regards Joakim Back to top Richard Heathfield Guest Posted: Mon May 07, 2007 9:12 am    Post subject: Re: SIGSEGV in malloc() Joakim Hove said: <snip> Quote: I allocate storage for such object many times in my application, and at some point in time (repeatedly at the same spot, but seemingly random to me), the application fails with a SIGSEGV at: data_ptr_type * data = malloc(sizeof *data); To me it seems quite illogical that the malloc implementation should be able to die with a SIGSEGV(?) - It's impossible to say for sure without seeing the code, but it's my guess that you've probably done one of these three things: 1) free(p); ..... later, you used this indeterminate pointer value - OR 2) free(p); ..... later, free(p); - OR 3) p = malloc(sizeof *p); if(p != NULL) { modify(&p) somehow; free(p); } Like I said, I'm just guessing really (because I can't see the code), but any of the above could explain why your malloc arena is stuffed. -- Richard Heathfield "Usenet is a strange place" - dmr 29/7/1999 http://www.cpax.org.uk email: rjh at the above domain, - www. Back to top        C++Talk.NET Forum Index -> C Language All times are GMT Page 1 of 1 Powered by phpBB © 2001, 2006 phpBB Group