LMDBG Lightweight malloc debugger
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memory Debugger malloc memory leaks malloc debugger

LMDBG Description

Lightweight malloc debugger LMDBG is an application that allows detecting memory leaksand double frees. However, unlike others, LMDBG generates *FULL* stacktracesand separates logging from analysis thusallowing to analyse an application on per-module basis.- lmdbg-run is a main lmdbg utility. It runs an application and creates a log file (or fifo) where all called malloc/calloc/realloc/free/memalign/posix_memalign invocations are registered with their input (bytes count, pointer), output (pointer) and (!!!uniques feature!!!) FULL STACKTRACE (pointers).Example: $ cat tests/test2.c #include int main () { void *p1 = NULL; void *p2 = NULL; p1 = malloc (555); p2 = realloc (p2, 666); p2 = realloc (p2, 777); p2 = realloc (p2, 888); return 0; } $ gcc -O0 -g -o _test2 tests/test2.c $ lmdbg-run -o _log ./_test2 $ cat _log malloc ( 555 ) --> 0xbb901400 0xbbbe58e8 0xbbbe5b03 0x8048738 0x8048584 0x80484e7 realloc ( NULL , 666 ) --> 0xbb901800 0xbbbe58e8 0xbbbe5a37 0x804874e 0x8048584 0x80484e7 realloc ( 0xbb901800 , 777 ) --> 0xbb901c00 0xbbbe58e8 0xbbbe5a37 0x8048764 0x8048584 0x80484e7 realloc ( 0xbb901c00 , 888 ) --> 0xbb901800 0xbbbe58e8 0xbbbe5a37 0x804877a 0x8048584 0x80484e7 $NOTE: Full stacktrace allows you to analyse your application, i.e. you can detect what blocks/components require more memory than others and why. lmdbg-sym is a very important tool for this, see below.- lmdbg-leaks analyses a log file generated by lmdbg-run and output all found memory leaksExample: $ lmdbg-leaks _log realloc ( 0xbb901c00 , 888 ) --> 0xbb901800 0xbbbe58e8 0xbbbe5a37 0x804877a 0x8048584 0x80484e7 malloc ( 555 ) --> 0xbb901400 0xbbbe58e8 0xbbbe5b03 0x8048738 0x8048584 0x80484e7 $- lmdbg-sym converts addresses to source.c:999 if it is possibleExample (gdb(1) is in action): $ lmdbg-sym ./_test2 _log malloc ( 555 ) --> 0xbb901400 0xbbbe58e8 0xbbbe5b03 0x8048738 tests/test2.c:8 main 0x8048584 0x80484e7 realloc ( NULL , 666 ) --> 0xbb901800 0xbbbe58e8 0xbbbe5a37 0x804874e tests/test2.c:9 main 0x8048584 0x80484e7 realloc ( 0xbb901800 , 777 ) --> 0xbb901c00 0xbbbe58e8 0xbbbe5a37 0x8048764 tests/test2.c:10 main 0x8048584 0x80484e7 realloc ( 0xbb901c00 , 888 ) --> 0xbb901800 0xbbbe58e8 0xbbbe5a37 0x804877a tests/test2.c:11 main 0x8048584 0x80484e7 $Example (addr2line(1) works here): $ lmdbg-sym -a ./_test2 _log malloc ( 555 ) --> 0xbb901400 0xbbbe58e8 0xbbbe5b03 0x8048738 tests/test2.c:8 0x8048584 0x80484e7 realloc ( NULL , 666 ) --> 0xbb901800 0xbbbe58e8 0xbbbe5a37 0x804874e tests/test2.c:9 0x8048584 0x80484e7 realloc ( 0xbb901800 , 777 ) --> 0xbb901c00 0xbbbe58e8 0xbbbe5a37 0x8048764 tests/test2.c:10 0x8048584 0x80484e7 realloc ( 0xbb901c00 , 888 ) --> 0xbb901800 0xbbbe58e8 0xbbbe5a37 0x804877a tests/test2.c:11 0x8048584 0x80484e7 $- lmdbg-sysleaks - greps or skips system memory leaks found in libc, libdl, C++ stl etc. See tests/lmdbg*.conf files. The default config files are: ~/.lmdbg.conf and /etc/lmdbg.conf- lmdbg = lmdbg-run + lmdbg-leaks + lmdbg-sym + lmdbg-sysleaksThat is lmdbg is all-in-one higher level tool.Example: $ lmdbg -v -o _log ./_test2 Memory leaks were detected and saved to file '_log' $ cat _log realloc ( 0xbb901c00 , 888 ) --> 0xbb901800 0xbbbe58e8 0xbbbe5a37 0x804877a tests/test2.c:11 main 0x8048584 0x80484e7 malloc ( 555 ) --> 0xbb901400 0xbbbe58e8 0xbbbe5b03 0x8048738 tests/test2.c:8 main 0x8048584 0x80484e7 $

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