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Joakim Hove
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 Posted: Mon May 07, 2007 9:12 am Post subject: SIGSEGV in malloc() |
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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 |
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Richard Heathfield
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| Posted: Mon May 07, 2007 9:12 am Post subject: Re: SIGSEGV in malloc() |
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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(?) -
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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. |
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