Undefined Behavior testing zstd in Gentoo #4776

meson test --print-errorlogs --num-processes 16 --timeout-multiplier=2
ninja: Entering directory `/var/tmp/portage/app-arch/zstd-1.5.7-r1/work/zstd-1.5.7/build/meson-abi_x86_64.amd64'
ninja: no work to do.
 1/10 zstd:test-invalidDictionaries OK                0.02s
 2/10 zstd:test-poolTests           OK                0.43s
 3/10 zstd:test-longmatch           OK                1.83s
 4/10 zstd:test-fullbench-2         FAIL             27.53s   exit status 1
>>> MSAN_OPTIONS=halt_on_error=1:abort_on_error=1:print_summary=1:print_stacktrace=1 MALLOC_PERTURB_=224 MESON_TEST_ITERATION=1 /var/tmp/portage/app-arch/zstd-1.5.7-r1/work/zstd-1.5.7/build/meson-abi_x86_64.amd64/tests/fullbench -i1 -P0
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stderr:
*** Zstandard speed analyzer 1.5.7 64-bits, by Yann Collet (Sep 10 2026) ***
 Sample 10000000 bytes :
 0#compress                       :  2741.4 MB/s  (10000241)
 1#decompress                     :  5532.4 MB/s  (10000000)
 2#compress_freshCCtx             :  2398.5 MB/s  (10000241)
 3#decompressDCtx                 :  3717.3 MB/s  (10000000)
 4#compressContinue               :  2201.5 MB/s  (10000241)
 5#compressContinue_extDict       :  1992.8 MB/s  (10000223)
 6#decompressContinue             :  3029.8 MB/s  (10000000)
 7#compressStream                 :  2109.1 MB/s  (10000237)
 8#compressStream_freshCCtx       :  1778.6 MB/s  (10000237)
 9#decompressStream               :  3988.0 MB/s  (10000000)
10#compress2                      :  2042.0 MB/s  (10000241)
11#compressStream2, end           :  1892.9 MB/s  (10000241)
12#compressStream2, end & short   :  1772.1 MB/s  (10000241)
13#compressStream2, continue      :  2227.2 MB/s  (10000237)
14#compressStream2, -T2, continue :  1653.3 MB/s  (10000237)
15#compressStream2, -T2, end      :  1417.4 MB/s  (10000241)
16#compressSequences              :  2650.6 MB/s  (10000241)
ERROR: Scenario 17: This mode cannot generate an uncompressed block
../../programs/benchfn.c:116:13: runtime error: null pointer passed as argument 1, which is declared to never be null
    #0 0x6350b8cd51be in BMK_benchFunction ../../programs/benchfn.c:116
    #1 0x6350b8cfc9b7 in BMK_benchTimedFn ../../programs/benchfn.c:220
    #2 0x6350b8cf3157 in benchMem ../../tests/fullbench.c:888
    #3 0x6350b8cef061 in benchSample ../../tests/fullbench.c:957
    #4 0x6350b8cef061 in main ../../tests/fullbench.c:1202
    #5 0x714bafe8d3bd in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:59
    #6 0x714bafe8d4da in __libc_start_main_impl ../csu/libc-start.c:360
    #7 0x6350b8cef964 in _start (/var/tmp/portage/app-arch/zstd-1.5.7-r1/work/zstd-1.5.7/build/meson-abi_x86_64.amd64/tests/fullbench+0x22964) (BuildId: 086f15e8ca2807af53ef92323b30bad2c495e8f7)

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 5/10 zstd:test-fullbench-1         FAIL             27.97s   exit status 1
>>> MALLOC_PERTURB_=153 MSAN_OPTIONS=halt_on_error=1:abort_on_error=1:print_summary=1:print_stacktrace=1 MESON_TEST_ITERATION=1 /var/tmp/portage/app-arch/zstd-1.5.7-r1/work/zstd-1.5.7/build/meson-abi_x86_64.amd64/tests/fullbench -i1
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stderr:
*** Zstandard speed analyzer 1.5.7 64-bits, by Yann Collet (Sep 10 2026) ***
 Sample 10000000 bytes :
 0#compress                       :   137.2 MB/s  ( 3239077)
 1#decompress                     :   757.8 MB/s  (10000000)
 2#compress_freshCCtx             :   148.4 MB/s  ( 3239077)
 3#decompressDCtx                 :   844.6 MB/s  (10000000)
 4#compressContinue               :   139.3 MB/s  ( 3239077)
 5#compressContinue_extDict       :   134.4 MB/s  ( 3239062)
 6#decompressContinue             :   597.1 MB/s  (10000000)
 7#compressStream                 :   120.5 MB/s  ( 3239075)
 8#compressStream_freshCCtx       :   133.2 MB/s  ( 3239075)
 9#decompressStream               :   704.9 MB/s  (10000000)
10#compress2                      :   137.4 MB/s  ( 3239077)
11#compressStream2, end           :   137.3 MB/s  ( 3239077)
12#compressStream2, end & short   :   121.9 MB/s  ( 3239077)
13#compressStream2, continue      :   146.8 MB/s  ( 3239075)
14#compressStream2, -T2, continue :   243.5 MB/s  ( 3240235)
15#compressStream2, -T2, end      :   205.9 MB/s  ( 3240239)
16#compressSequences              :   211.4 MB/s  ( 3239695)
17#compressSequencesAndLiterals   :   208.1 MB/s  ( 3239695)
../../programs/benchfn.c:116:13: runtime error: null pointer passed as argument 1, which is declared to never be null
    #0 0x60e0e86161be in BMK_benchFunction ../../programs/benchfn.c:116
    #1 0x60e0e863d9b7 in BMK_benchTimedFn ../../programs/benchfn.c:220
    #2 0x60e0e8634157 in benchMem ../../tests/fullbench.c:888
    #3 0x60e0e8630061 in benchSample ../../tests/fullbench.c:957
    #4 0x60e0e8630061 in main ../../tests/fullbench.c:1202
    #5 0x7280b09473bd in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:59
    #6 0x7280b09474da in __libc_start_main_impl ../csu/libc-start.c:360
    #7 0x60e0e8630964 in _start (/var/tmp/portage/app-arch/zstd-1.5.7-r1/work/zstd-1.5.7/build/meson-abi_x86_64.amd64/tests/fullbench+0x22964) (BuildId: 086f15e8ca2807af53ef92323b30bad2c495e8f7)

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 6/10 zstd:test-decodecorpus        OK               30.04s
 7/10 fast - zstd:test-zstd-fast    OK               41.01s
 8/10 zstd:test-zstream-3           OK               90.06s
 9/10 zstd:test-zstream-1           OK              102.78s
10/10 zstd:test-fuzzer              OK              218.94s

Summary of Failures:

 4/10 zstd:test-fullbench-2         FAIL             27.53s   exit status 1
 5/10 zstd:test-fullbench-1         FAIL             27.97s   exit status 1

Ok:                8
Fail:              2

Full log written to /var/tmp/portage/app-arch/zstd-1.5.7-r1/work/zstd-1.5.7/build/meson-abi_x86_64.amd64/meson-logs/testlog.txt