Final Linux gzip qualification, frozen core patch 9b537e1d

Owned host directory: /tmp/unstd-linux-throughput-bEatz1X6/final-sanitizer-agent
Container: unstd-gzip-final-asan-agent-bEatz1X6
Image: consumer-ci-runner:local
Isolation: --cpuset-cpus=29 --cpus=1 --network=none
Mounts: shared host directory at /work read-only; final-sanitizer-agent subdirectory writable.
No source-final, production installation, root container, CPU 28, or repository mutations.

Frozen patch SHA256:
9b537e1df67e96f78bd683db3d2d2c6de9709398687b7e4c3f6a043686baf905
Patched ISA-L C SHA256:
bd2afa52d7da3f909e2aa103bdf68e26521453ae103da52fccf42e9db9b6dbc0
Sanitized native SHA256:
9f5fba5b95ff41296d724395356415c1f9ea7c61f79d4d2814196822d7692cdf

Build only gzip from a private copy of source-final:
cp -a /work/source-final /work/final-sanitizer-agent/source
cd /work/final-sanitizer-agent/source
env PATH=/work/tools:$PATH PYTHONPATH=/work/deps CFLAGS='-O1 -g -fsanitize=address,undefined -fno-omit-frame-pointer' LDFLAGS='-fsanitize=address,undefined' python3 /work/build_gzip_final.py --root /work/final-sanitizer-agent/source --before /work/baseline --output /work/final-sanitizer-agent/candidate > /work/final-sanitizer-agent/build.log 2>&1

All sanitizer Python commands used this shell function; LD_PRELOAD was never exported to collectors:
run_asan() {
    env LD_PRELOAD=/usr/lib/gcc/x86_64-linux-gnu/12/libasan.so ASAN_OPTIONS=detect_leaks=0:halt_on_error=1 UBSAN_OPTIONS=halt_on_error=1:print_stacktrace=1 PYTHONMALLOC=malloc PYTHONPATH=/work/final-sanitizer-agent/candidate:/work/deps:/work/final-sanitizer-agent/source PYTHONDONTWRITEBYTECODE=1 "$@"
}

33 ISA-L plus 91 public-history regressions: 124 passed in 0.98s, no skips or sanitizer findings.
run_asan python3 -m pytest tests/suites/product/compress/unit/test_native_isal.py tests/suites/product/compress/unit/test_stream_histories.py -q --basetemp /work/final-sanitizer-agent/pytest124 -o cache_dir=/work/final-sanitizer-agent/pytest-cache > /work/final-sanitizer-agent/tests.log 2>&1

Strict NG-prefix corpus: 0/15,920 raw + 0/7,296 public + 0 diagnostic mismatches.
run_asan python3 /work/final_budget_probe.py --prototype /work/final-sanitizer-agent/candidate/unstd/compress/_gzip_native.cpython-314-x86_64-linux-gnu.so --output /work/final-sanitizer-agent/budget-ng.json > /work/final-sanitizer-agent/budget-ng.log 2>&1

Strict stdlib-prefix corpus: 0/15,920 raw + 0/7,296 public + 0 diagnostic mismatches.
run_asan python3 /work/final_budget_stdlib.py --prototype /work/final-sanitizer-agent/candidate/unstd/compress/_gzip_native.cpython-314-x86_64-linux-gnu.so --output /work/final-sanitizer-agent/budget-stdlib.json > /work/final-sanitizer-agent/budget-stdlib.log 2>&1

Large member, actual final3 native SHA256 931aea2d9f02342396c48053b5ce0c891878ef709df609c22a2ed9d98a09a00f:
env PYTHONPATH=/work/final3:/work/deps:/work/source-final PYTHONDONTWRITEBYTECODE=1 python3 /work/final-sanitizer-agent/unstd-final-large-gzip.py --output-dir /work/final-sanitizer-agent/large > /work/final-sanitizer-agent/large.log 2>&1

Large result: one valid gzip member, 4,295,122,944 decoded bytes, CRC32 669462081,
ISIZE 155648, 12,559,570 compressed bytes. Both NG and observed ISA-L produced
the same count/CRC and identical checkpoints around 2**32. Generation and reads
used 256 KiB chunks. Candidate peak RSS was 22,282,240 bytes; NG 21,233,664 bytes;
generator 20,447,232 bytes. No whole uncompressed member was allocated or saved.

Metadata confirms CPU allowance 29, ISA-L 2.31.1 active, libasan.so.8/libubsan.so.1,
29 ASan symbol references and 11 UBSan references. Leak checking was disabled;
ASan/UBSan memory/undefined-behavior diagnostics remained fatal.
