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charset="utf-8" Simplifying the crash cases by opportunistically setting bits in operands of out/write to zero may help to debug, since usually bit one means turn on or trigger a function while zero is the default turn-off setting. Tested Bug 1908062. Signed-off-by: Qiuhao Li --- scripts/oss-fuzz/minimize_qtest_trace.py | 39 ++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/scripts/oss-fuzz/minimize_qtest_trace.py b/scripts/oss-fuzz/mi= nimize_qtest_trace.py index 45c1627d32..2325b38dbc 100755 --- a/scripts/oss-fuzz/minimize_qtest_trace.py +++ b/scripts/oss-fuzz/minimize_qtest_trace.py @@ -164,6 +164,42 @@ def remove_lines(newtrace, outpath): i +=3D 1 =20 =20 +def clear_bits(newtrace, outpath): + # try setting bits in operands of out/write to zero + i =3D 0 + while i < len(newtrace): + if (not newtrace[i].startswith("write ") and not + newtrace[i].startswith("out")): + i +=3D 1 + continue + # write ADDR SIZE DATA + # outx ADDR VALUE + print("\nzero setting bits: {}".format(newtrace[i])) + + prefix =3D " ".join(newtrace[i].split()[:-1]) + data =3D newtrace[i].split()[-1] + data_bin =3D bin(int(data, 16)) + data_bin_list =3D list(data_bin) + + for j in range(2, len(data_bin_list)): + prior =3D newtrace[i] + if (data_bin_list[j] =3D=3D '1'): + data_bin_list[j] =3D '0' + data_try =3D hex(int("".join(data_bin_list), 2)) + # It seems qtest only accepts padded hex-values. + if len(data_try) % 2 =3D=3D 1: + data_try =3D data_try[:2] + "0" + data_try[2:-1] + + newtrace[i] =3D "{prefix} {data_try}\n".format( + prefix=3Dprefix, + data_try=3Ddata_try) + + if not check_if_trace_crashes(newtrace, outpath): + data_bin_list[j] =3D '1' + newtrace[i] =3D prior + i +=3D 1 + + def minimize_trace(inpath, outpath): global TIMEOUT with open(inpath) as f: @@ -184,7 +220,10 @@ def minimize_trace(inpath, outpath): old_len =3D len(newtrace) remove_lines(newtrace, outpath) newtrace =3D list(filter(lambda s: s !=3D "", newtrace)) + assert(check_if_trace_crashes(newtrace, outpath)) =20 + # set bits to zero + clear_bits(newtrace, outpath) assert(check_if_trace_crashes(newtrace, outpath)) =20 =20 --=20 2.25.1