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POmalloc.c "sYSMALLOC: Assertion" in execution with C++ project
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8840785
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2012-01-12T19:04:42.160
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2012-01-12T23:25:42.697
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FINAL_EDIT: Found the problem, in a for loop the counter, that was used as an index as well, was greater than the number of the elements of the array. The weird thing about it, was that I wasn't receiving segmentation fault and instead the error I've mentioned. Why was that? Thank you for your help! _____________________________ I have a project in C++ and am getting this error (NOT ALWAYS) and if a specific global variable that acts as a size of an <code>int</code> array. NEW EDIT_1->I haven't used the <code>new</code> operator at all except for the main function that I am declaring a new array of pointers to objects of a class. Like this: <pre><code>Student* test[NUM_AM]; for(int i=0; i<NUM_AM; i++) { test[i] = new Student(random_elements); } </code></pre> Is there any way to find the line that causes this? The error is this (copied the output of gdb): <pre><code>malloc.c:3096: 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. Program received signal SIGABRT, Aborted. 0x00007ffff75563a5 in __GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64 64 ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory. in ../nptl/sysdeps/unix/sysv/linux/raise.c </code></pre> Also valgrind gives this: <pre><code>==6775== HEAP SUMMARY: ==6775== in use at exit: 560 bytes in 35 blocks ==6775== total heap usage: 35 allocs, 0 frees, 560 bytes allocated ==6775== ==6775== LEAK SUMMARY: ==6775== definitely lost: 560 bytes in 35 blocks ==6775== indirectly lost: 0 bytes in 0 blocks ==6775== possibly lost: 0 bytes in 0 blocks ==6775== still reachable: 0 bytes in 0 blocks ==6775== suppressed: 0 bytes in 0 blocks ==6775== Rerun with --leak-check=full to see details of leaked memory ==6775== ==6775== For counts of detected and suppressed errors, rerun with: -v ==6775== Use --track-origins=yes to see where uninitialised values come from ==6775== ERROR SUMMARY: 806 errors from 2 contexts (suppressed: 4 from 4) </code></pre> Thank you for your time. NEW_EDIT2: I ran the application with: <pre><code>valgrind --leak-check=full --track-origins=yes ./out and NUM_AM = 25; </code></pre> This is the output I got is here at pastebin: <a href="http://pastebin.com/xvkCVnCD" rel="nofollow"> here! </a> NEW_EDIT3: I should mention that the program creates students with an ID and assigns them a true/false value at a bool array and 2 bool variables. The variable NUM_AM is used as an index of the static arrays declared as class members. Also, NUM_AM is used in several functions when searching for their ID. With NUM_AM > 22 the error can happen even after the creation of the 1st student. With NUM_AM < = 21, I haven't been able to reproduce the error with multiple serial executions of the program.
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<c++><malloc>
Title
malloc.c "sYSMALLOC: Assertion" in execution with C++ project
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1. PO
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1. USChris
UserOwnerUserId
1. USChris
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