==3832== Conditional jump or move depends on uninitialised value(s)
==3832==    at 0x139D3C: JS_CreateProperty (quickjs.c:9380)
==3832==    by 0x198971: js_iterator_concat_next (quickjs.c:41518)
==3832==    by 0x16147D: js_call_c_function (quickjs.c:15912)
==3832==    by 0x130445: JS_CallInternal (quickjs.c:16128)
==3832==    by 0x130886: JS_CallInternal (quickjs.c:16551)
==3832==    by 0x1AAC3C: JS_CallFree (quickjs.c:18596)
==3832==    by 0x1AAC3C: JS_EvalFunctionInternal (quickjs.c:34544)
==3832==    by 0x1ABF1F: __JS_EvalInternal (quickjs.c:34679)
==3832==    by 0x170810: JS_EvalInternal (quickjs.c:34705)
==3832==    by 0x170810: JS_EvalThis2 (quickjs.c:34760)
==3832==    by 0x170810: JS_Eval (quickjs.c:34774)
==3832==    by 0x11B4B2: eval_buf (run-test262.c:1348)
==3832==    by 0x11C8FA: run_test_buf (run-test262.c:1765)
==3832==    by 0x11D25E: run_test (run-test262.c:1948)
==3832==    by 0x11D863: run_test_dir_list (run-test262.c:2091)
==3832==  Uninitialised value was created by a stack allocation
==3832==    at 0x1985F0: js_iterator_concat_next (quickjs.c:41442)

ThreadSanitizer:DEADLYSIGNAL
==2753==ERROR: ThreadSanitizer: SEGV on unknown address 0x7274000f1058 (pc 0x55e9945b6cb9 bp 0x7f65e99fa190 sp 0x7f65e99fa0e0 T2757)
==2753==The signal is caused by a READ memory access.
    #0 JS_IsFunction /home/runner/work/quickjs/quickjs/quickjs.c:10214 (run-test262+0x4acb9) (BuildId: 967e148379d0b719d73b0725aed89d65337c09c7)
    #1 JS_CreateProperty /home/runner/work/quickjs/quickjs/quickjs.c:9390 (run-test262+0x4acb9)
    #2 JS_DefineProperty /home/runner/work/quickjs/quickjs/quickjs.c:9752 (run-test262+0x4b12c) (BuildId: 967e148379d0b719d73b0725aed89d65337c09c7)
    #3 js_iterator_concat_next /home/runner/work/quickjs/quickjs/quickjs.c:41940 (run-test262+0xe47fb) (BuildId: 967e148379d0b719d73b0725aed89d65337c09c7)
    #4 js_call_c_function /home/runner/work/quickjs/quickjs/quickjs.c:16313 (run-test262+0x8eb68) (BuildId: 967e148379d0b719d73b0725aed89d65337c09c7)
    #5 JS_CallInternal /home/runner/work/quickjs/quickjs/quickjs.c:16529 (run-test262+0x38327) (BuildId: 967e148379d0b719d73b0725aed89d65337c09c7)
    #6 JS_CallInternal /home/runner/work/quickjs/quickjs/quickjs.c:16952 (run-test262+0x3893c) (BuildId: 967e148379d0b719d73b0725aed89d65337c09c7)
    #7 JS_CallFree /home/runner/work/quickjs/quickjs/quickjs.c:18997 (run-test262+0xff6c6) (BuildId: 967e148379d0b719d73b0725aed89d65337c09c7)
    #8 JS_EvalFunctionInternal /home/runner/work/quickjs/quickjs/quickjs.c:34966 (run-test262+0xff6c6)
    #9 __JS_EvalInternal /home/runner/work/quickjs/quickjs/quickjs.c:35101 (run-test262+0x101a89) (BuildId: 967e148379d0b719d73b0725aed89d65337c09c7)
    #10 JS_EvalInternal /home/runner/work/quickjs/quickjs/quickjs.c:35127 (run-test262+0xa5147) (BuildId: 967e148379d0b719d73b0725aed89d65337c09c7)
    #11 JS_EvalThis2 /home/runner/work/quickjs/quickjs/quickjs.c:35182 (run-test262+0xa5147)
    #12 JS_Eval /home/runner/work/quickjs/quickjs/quickjs.c:35196 (run-test262+0xa5147)
    #13 eval_buf /home/runner/work/quickjs/quickjs/run-test262.c:1348 (run-test262+0x1660b) (BuildId: 967e148379d0b719d73b0725aed89d65337c09c7)
    #14 run_test_buf /home/runner/work/quickjs/quickjs/run-test262.c:1765 (run-test262+0x1849b) (BuildId: 967e148379d0b719d73b0725aed89d65337c09c7)
    #15 run_test /home/runner/work/quickjs/quickjs/run-test262.c:1948 (run-test262+0x19115) (BuildId: 967e148379d0b719d73b0725aed89d65337c09c7)
    #16 run_test_dir_list /home/runner/work/quickjs/quickjs/run-test262.c:2091 (run-test262+0x1983f) (BuildId: 967e148379d0b719d73b0725aed89d65337c09c7)
    #17 __tsan_thread_start_func ../../../../src/libsanitizer/tsan/tsan_interceptors_posix.cpp:1012 (libtsan.so.2+0x4edee) (BuildId: 38097064631f7912bd33117a9c83d08b42e15571)
    #18 <null> <null> (libc.so.6+0x9caa3) (BuildId: 274eec488d230825a136fa9c4d85370fed7a0a5e)
    #19 <null> <null> (libc.so.6+0x129c6b) (BuildId: 274eec488d230825a136fa9c4d85370fed7a0a5e)