malloc.c:3074 error?

Question

When I write a C program, I encountered a problem that is as follows:

malloc.c:3074: sYSMALLOc: Assertion (old_top == (((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) - __builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= (unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) == 0) failed.

Please help me to fix it, thanks in advance!

Looks like a heap misuse. You shoul provide a snippet that exposes that. — sharptooth, Jul 08 '09 at 13:20
Can you reproduce it with a small example? With about ten lines of code. — Eugene Bujak, Jul 08 '09 at 13:21
I just using the malloc() method to get some memory. If I comment this line, this problom will not occur. — Charlie Epps, Jul 08 '09 at 13:24
The line just like that char *seq=malloc(1000*sizeof(char)); Of course, there are some more line like that. But I don't know where it is. — Charlie Epps, Jul 08 '09 at 13:26
try to use many assertions. Don't combine all those logical tests into one statement, *if* you want to locate the problem easily. — Nick Dandoulakis, Jul 08 '09 at 13:27
How big is the block you are attempting to allocate? (i.e. what is the parameter to malloc?) — Dave Gamble, Jul 08 '09 at 13:34
FS#15422 - [wmix] latest update breaks malloc.c ? http://bugs.archlinux.org/task/15422?dev=allan — Nick Dandoulakis, Jul 08 '09 at 13:35

score 2 · Accepted Answer · answered Jul 08 '09 at 13:22

It seems like the administration kept for memory allocation has been corrupted. My guess would be that you have something like a buffer overflow somewhere before this error occurs.

As the error is a result of an earlier problem (assuming I'm right), this can be a somewhat difficult problem to fix. Perhaps a tool like valgrind can help you to detect incorrect writes to memory. If you have a small program that demonstrates the problem, I would suggest adding that code to your question.

My program is a little large, I can't display all the codes here. — Charlie Epps, Jul 08 '09 at 13:30

malloc.c:3074 error?

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