The fuzz test runner does not add the UBSan suppressions when fetching the harness list. We can observe this in CI as lots of UBSan errors prior to the harnesses actually executing: https://api.cirrus-ci.com/v1/task/5678606140047360/logs/ci.log
+ test/fuzz/test_runner.py -j10 -l DEBUG /ci_container_base/ci/scratch/qa-assets/fuzz_seed_corpus/ --empty_min_time=60
/usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/string_view:578:38: runtime error: unsigned integer overflow: 12 - 23 cannot be represented in type 'size_type' (aka 'unsigned long')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/string_view:578:38 in
/usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/string_view:578:33: runtime error: implicit conversion from type 'size_type' (aka 'unsigned long') of value 18446744073709551605 (64-bit, unsigned) to type 'const difference_type' (aka 'const long') changed the value to -11 (64-bit, signed)
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/string_view:578:33 in
crypto/sha256.cpp:75:57: runtime error: left shift of 1359893119 by 26 places cannot be represented in type 'uint32_t' (aka 'unsigned int')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior crypto/sha256.cpp:75:57 in
crypto/sha256.cpp:75:79: runtime error: left shift of 1359893119 by 21 places cannot be represented in type 'uint32_t' (aka 'unsigned int')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior crypto/sha256.cpp:75:79 in
crypto/sha256.cpp:75:101: runtime error: left shift of 1359893119 by 7 places cannot be represented in type 'uint32_t' (aka 'unsigned int')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior crypto/sha256.cpp:75:101 in
crypto/sha256.cpp:82:47: runtime error: unsigned integer overflow: 2968370640 + 2483695512 cannot be represented in type 'uint32_t' (aka 'unsigned int')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior crypto/sha256.cpp:82:47 in
crypto/sha256.cpp:74:57: runtime error: left shift of 1779033703 by 30 places cannot be represented in type 'uint32_t' (aka 'unsigned int')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior crypto/sha256.cpp:74:57 in
crypto/sha256.cpp:74:79: runtime error: left shift of 1779033703 by 19 places cannot be represented in type 'uint32_t' (aka 'unsigned int')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior crypto/sha256.cpp:74:79 in
crypto/sha256.cpp:74:101: runtime error: left shift of 1779033703 by 10 places cannot be represented in type 'uint32_t' (aka 'unsigned int')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior crypto/sha256.cpp:74:101 in
crypto/sha256.cpp:83:29: runtime error: unsigned integer overflow: 3458249854 + 980412007 cannot be represented in type 'uint32_t' (aka 'unsigned int')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior crypto/sha256.cpp:83:29 in
crypto/sha256.cpp:82:21: runtime error: unsigned integer overflow: 528734635 + 4228187651 cannot be represented in type 'uint32_t' (aka 'unsigned int')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior crypto/sha256.cpp:82:21 in
crypto/sha256.cpp:84:7: runtime error: unsigned integer overflow: 1013904242 + 3720769133 cannot be represented in type 'uint32_t' (aka 'unsigned int')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior crypto/sha256.cpp:84:7 in
crypto/sha256.cpp:85:12: runtime error: unsigned integer overflow: 3720769133 + 2654153126 cannot be represented in type 'uint32_t' (aka 'unsigned int')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior crypto/sha256.cpp:85:12 in
crypto/sha256.cpp:82:33: runtime error: unsigned integer overflow: 4165002546 + 1259303586 cannot be represented in type 'uint32_t' (aka 'unsigned int')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior crypto/sha256.cpp:82:33 in
crypto/sha256.cpp:125:50: runtime error: unsigned integer overflow: 3835390401 + 1367343104 cannot be represented in type 'unsigned int'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior crypto/sha256.cpp:125:50 in
crypto/sha256.cpp:77:58: runtime error: left shift of 1367343104 by 15 places cannot be represented in type 'uint32_t' (aka 'unsigned int')
...
To fix this we simply apply the usual fuzz env variables (that apply the suppressions) when fetching the harness list as well.
