https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91101
--- Comment #3 from Frantisek Sumsal <frantisek at sumsal dot cz> --- ltrace stastistics: # WITH sanitizers and detect_stack_use_after_return=1 [vagrant@arch build]$ export ASAN_OPTIONS=strict_string_checks=1:detect_stack_use_after_return=1:check_initialization_order=1:strict_init_order=1 [vagrant@arch build]$ ltrace -c build-gcc-9.1.0-sanitizers-tempfiles/test-conf-parser <...snip...> ==25291==LeakSanitizer has encountered a fatal error. ==25291==HINT: For debugging, try setting environment variable LSAN_OPTIONS=verbosity=1:log_threads=1 ==25291==HINT: LeakSanitizer does not work under ptrace (strace, gdb, etc) % time seconds usecs/call calls function ------ ----------- ----------- --------- -------------------- 99.86 28.250721 1661807 17 config_parse 0.03 0.007281 3640 2 __asan_init 0.01 0.003920 230 17 log_internal_realm 0.01 0.003716 50 73 __asan_stack_malloc_0 0.01 0.002837 166 17 fmkostemp_safe 0.01 0.002085 122 17 fwrite 0.01 0.001718 101 17 unlink_tempfilep 0.01 0.001490 87 17 rewind 0.00 0.001354 79 17 safe_fclose 0.00 0.001311 77 17 strlen 0.00 0.001208 50 24 free 0.00 0.001191 170 7 config_parse_mode 0.00 0.000998 142 7 config_parse_unsigned 0.00 0.000984 140 7 config_parse_path 0.00 0.000946 135 7 config_parse_int 0.00 0.000941 52 18 __asan_stack_malloc_3 0.00 0.000921 102 9 config_parse_iec_size 0.00 0.000901 128 7 config_parse_sec 0.00 0.000850 56 15 strcmp 0.00 0.000850 121 7 config_parse_nsec 0.00 0.000826 91 9 config_parse_si_size 0.00 0.000800 47 17 log_get_max_level_realm 0.00 0.000460 460 1 log_parse_environment_realm 0.00 0.000381 63 6 config_parse_strv 0.00 0.000348 49 7 strcmp_ptr 0.00 0.000336 112 3 config_parse_log_facility 0.00 0.000314 104 3 config_parse_log_level 0.00 0.000299 49 6 strv_equal 0.00 0.000282 56 5 strv_free 0.00 0.000154 154 1 __asan_unregister_globals 0.00 0.000109 54 2 config_parse_iec_uint64 0.00 0.000079 79 1 __asan_register_globals 0.00 0.000057 57 1 log_open 0.00 0.000047 47 1 __asan_version_mismatch_check_v8 ------ ----------- ----------- --------- -------------------- 100.00 28.290715 382 total # WITH sanitizers and detect_stack_use_after_return=0 [vagrant@arch build]$ export ASAN_OPTIONS=strict_string_checks=1:detect_stack_use_after_return=0:check_initialization_order=1:strict_init_order=1 [vagrant@arch build]$ ltrace -c build-gcc-9.1.0-sanitizers-tempfiles/test-conf-parser <...snip...> ==25301==LeakSanitizer has encountered a fatal error. ==25301==HINT: For debugging, try setting environment variable LSAN_OPTIONS=verbosity=1:log_threads=1 ==25301==HINT: LeakSanitizer does not work under ptrace (strace, gdb, etc) % time seconds usecs/call calls function ------ ----------- ----------- --------- -------------------- 98.90 2.914199 171423 17 config_parse 0.23 0.006749 3374 2 __asan_init 0.10 0.002973 174 17 log_internal_realm 0.09 0.002646 155 17 fmkostemp_safe 0.07 0.002095 123 17 fwrite 0.05 0.001416 83 17 unlink_tempfilep 0.05 0.001406 82 17 rewind 0.04 0.001317 54 24 free 0.04 0.001257 73 17 strlen 0.04 0.001225 72 17 safe_fclose 0.04 0.001060 151 7 config_parse_mode 0.03 0.000891 52 17 log_get_max_level_realm 0.03 0.000877 97 9 config_parse_iec_size 0.03 0.000862 57 15 strcmp 0.03 0.000851 121 7 config_parse_int 0.03 0.000846 120 7 config_parse_unsigned 0.03 0.000841 120 7 config_parse_path 0.03 0.000838 93 9 config_parse_si_size 0.02 0.000692 98 7 config_parse_sec 0.02 0.000679 97 7 config_parse_nsec 0.01 0.000395 395 1 log_parse_environment_realm 0.01 0.000364 60 6 config_parse_strv 0.01 0.000359 51 7 strcmp_ptr 0.01 0.000324 108 3 config_parse_log_facility 0.01 0.000309 51 6 strv_equal 0.01 0.000282 56 5 strv_free 0.01 0.000266 88 3 config_parse_log_level 0.01 0.000154 154 1 __asan_unregister_globals 0.00 0.000109 54 2 config_parse_iec_uint64 0.00 0.000082 82 1 __asan_register_globals 0.00 0.000054 54 1 __asan_version_mismatch_check_v8 0.00 0.000049 49 1 log_open ------ ----------- ----------- --------- -------------------- 100.00 2.946467 291 total # WITHOUT sanitizers [vagrant@arch build]$ ltrace -c build-gcc-9.1.0/test-conf-parser <...snip...> % time seconds usecs/call calls function ------ ----------- ----------- --------- -------------------- 97.98 1.259239 74072 17 config_parse 0.27 0.003530 207 17 log_internal_realm 0.19 0.002399 141 17 fmkostemp_safe 0.16 0.002012 118 17 fwrite 0.13 0.001629 95 17 unlink_tempfilep 0.12 0.001539 90 17 rewind 0.10 0.001301 54 24 free 0.10 0.001274 74 17 strlen 0.10 0.001225 72 17 safe_fclose 0.08 0.001057 151 7 config_parse_mode 0.08 0.001032 60 17 log_get_max_level_realm 0.07 0.000955 136 7 config_parse_int 0.07 0.000953 105 9 config_parse_iec_size 0.07 0.000914 130 7 config_parse_unsigned 0.07 0.000869 96 9 config_parse_si_size 0.07 0.000840 120 7 config_parse_nsec 0.06 0.000792 113 7 config_parse_sec 0.06 0.000720 102 7 config_parse_path 0.06 0.000715 47 15 strcmp 0.03 0.000403 57 7 strcmp_ptr 0.02 0.000307 51 6 strv_equal 0.02 0.000292 97 3 config_parse_log_facility 0.02 0.000290 96 3 config_parse_log_level 0.02 0.000284 47 6 config_parse_strv 0.02 0.000250 50 5 strv_free 0.02 0.000249 249 1 log_parse_environment_realm 0.01 0.000128 64 2 config_parse_iec_uint64 0.00 0.000050 50 1 log_open ------ ----------- ----------- --------- -------------------- 100.00 1.285248 286 total ---- For some reason the `config_parse` function (in this particular case) is called almost 10 times more often with `detect_stack_use_after_return=1` than withoiut, which is not the case with GCC 8.3.0 (where it is 205089 calls with `detect_stack_use_after_return=1` versus 192490 without).
