Valgrind program is crashing Bad permissions for mapped region at address

I am trying to run my program to check memory leaks in my program but whenever I start my program I am getting

==3476== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==3476== Bad permissions for mapped re开发者_如何转开发gion at address 0xCFE3FF8
==3476==    at 0x005212e1: get_document_root (mongoose.c:1557)
==3476==


==3476== HEAP SUMMARY:
==3476== in use at exit: 2,134,492 bytes in 3,948 blocks
==3476== total heap usage: 5,473 allocs, 1,525 frees, 2,863,520 bytes allocated
==3476==

and in full valgrind log thee is no invalid read or write on the memory. I am not able to understand why it is crashing.

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It was crashing because of custom 404 page and that file was not there. So it was infinitely looking for that file and doing buffer overflow.