Hi,
yubiao hu <huyubi...@gmail.com> writes:
> Package: coreutils
> Version: 9.4
> Severity: normal
>
> I was trying to build coreutils with ASan, and found a memory leak in expr.
>
> When running:
> expr length "hello"
>
> Output:
> =================================================================
> ==755058==ERROR: LeakSanitizer: detected memory leaks
>
> Direct leak of 24 byte(s) in 1 object(s) allocated from:
> #0 0xffff7f7a2524 in __interceptor_malloc
> ../../../../libsanitizer/asan/asan_malloc_linux.cpp:69
> #1 0xaaaacd31f4c8 in xmalloc ../lib/xmalloc.c:45
> #2 0xaaaacd2a0dd4 in int_value ../src/expr.c:369
> #3 0xaaaacd2a0dd4 in eval6 ../src/expr.c:714
> #4 0xaaaacd2a0dd4 in eval6 ../src/expr.c:694
> #5 0xaaaacd2a4f44 in eval5 ../src/expr.c:786
> #6 0xaaaacd2a5320 in eval4 ../src/expr.c:817
> #7 0xaaaacd2a595c in eval3 ../src/expr.c:856
> #8 0xaaaacd2a5dbc in eval2 ../src/expr.c:886
> #9 0xaaaacd2a72e0 in eval1 ../src/expr.c:965
> #10 0xaaaacd2a7874 in eval ../src/expr.c:996
> #11 0xaaaacd29d3e0 in main ../src/expr.c:352
I recommend running the following in your shell before testing with
address sanitizer:
$ export ASAN_OPTIONS="detect_leaks=0
Most (all?) of the programs in Coreutils will not free memory before
exit, since it just takes extra time for no benefit.
Also, I expect most other GNU programs to behave this way. Since it is
the behavior recommended in the GNU Coding Standards [1].
Thanks,
Collin
[1] https://www.gnu.org/prep/standards/standards.html#Memory-Usage
