Hi, Building coreutils-9.4.170-7b206 on a glibc system, with clang and ASAN and UBSAN options, produces 4 test failures.
I'm using clang 17.0.4 with the options CC="$CC -fsanitize=address,undefined,signed-integer-overflow,shift,integer-divide-by-zero" CFLAGS="-O0 -fno-omit-frame-pointer -ggdb" ASAN_OPTIONS="detect_leaks=0 abort_on_error=1 allocator_may_return_null=1" The failing tests are: FAIL: tests/misc/comm.pl FAIL: tests/join/join.pl FAIL: tests/uniq/uniq.pl FAIL: tests/ls/removed-directory.sh In the test-suite.log file there are hundreds of occurrences of + ../lib/linebuffer.c:65:22: runtime error: applying zero offset to null pointer + SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../lib/linebuffer.c:65:22 in and 1 occurrence of +../lib/mpsort.c:155:34: runtime error: applying zero offset to null pointer +SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../lib/mpsort.c:155:34 in I have proposed a fix for this in <https://lists.gnu.org/archive/html/bug-gnulib/2023-12/msg00055.html>, but Paul Eggert opposes it. Bruno
