Suricata

gdb --args ./src/fuzz_mimedecparseline ~/Downloads/clusterfuzz-testcase-minimized-fuzz_mimedecparseline-5667327394054144 
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Reading symbols from ./src/fuzz_mimedecparseline...
warning: Missing auto-load script at offset 0 in section .debug_gdb_scripts
of file /home/victor/sync/devel/suricata-afl/src/fuzz_mimedecparseline.
Use `info auto-load python-scripts [REGEXP]' to list them.
(gdb) r
Starting program: /home/victor/sync/devel/suricata-afl/src/fuzz_mimedecparseline /home/victor/Downloads/clusterfuzz-testcase-minimized-fuzz_mimedecparseline-5667327394054144
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
fuzz_mimedecparseline: util-decode-mime.c:1389: int ProcessBase64BodyLine(const uint8_t *, uint32_t, MimeDecParseState *): Assertion `!((state->bvr_len != 0))' failed.

Program received signal SIGABRT, Aborted.
__pthread_kill_implementation (no_tid=0, signo=6, threadid=140737333445184) at ./nptl/pthread_kill.c:44
44    ./nptl/pthread_kill.c: No such file or directory.
(gdb) bt
#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=140737333445184) at ./nptl/pthread_kill.c:44
#1  __pthread_kill_internal (signo=6, threadid=140737333445184) at ./nptl/pthread_kill.c:78
#2  __GI___pthread_kill (threadid=140737333445184, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#3  0x00007ffff726b476 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#4  0x00007ffff72517f3 in __GI_abort () at ./stdlib/abort.c:79
#5  0x00007ffff725171b in __assert_fail_base (fmt=0x7ffff7406150 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x5555576c3980 <str> "!((state->bvr_len != 0))", 
    file=0x5555576c17e0 <str> "util-decode-mime.c", line=1389, function=<optimized out>) at ./assert/assert.c:92
#6  0x00007ffff7262e96 in __GI___assert_fail (assertion=0x5555576c3980 <str> "!((state->bvr_len != 0))", file=0x5555576c17e0 <str> "util-decode-mime.c", line=1389, 
    function=0x5555576c3800 <__PRETTY_FUNCTION__.ProcessBase64BodyLine> "int ProcessBase64BodyLine(const uint8_t *, uint32_t, MimeDecParseState *)") at ./assert/assert.c:101
#7  0x0000555555ec52f0 in ProcessBase64BodyLine (buf=0x612000000064 ' ' <repeats 200 times>..., len=256, state=0x61f000000080) at util-decode-mime.c:1389
#8  0x0000555555ec3c22 in ProcessBodyLine (buf=0x612000000064 ' ' <repeats 200 times>..., len=256, state=0x61f000000080) at util-decode-mime.c:1567
#9  0x0000555555ec19b5 in ProcessMimeBody (buf=0x612000000064 ' ' <repeats 200 times>..., len=256, state=0x61f000000080) at util-decode-mime.c:2309
#10 0x0000555555eb919c in ProcessMimeEntity (buf=0x612000000064 ' ' <repeats 200 times>..., len=256, state=0x61f000000080) at util-decode-mime.c:2370
#11 0x0000555555eb8b41 in MimeDecParseLine (line=0x612000000064 ' ' <repeats 200 times>..., len=256, delim_len=0 '\000', state=0x61f000000080) at util-decode-mime.c:2562
#12 0x0000555555e6c25b in LLVMFuzzerTestOneInput (data=0x612000000040 "Content-Transfer-Encoding:base64\n\n\377\n", ' ' <repeats 164 times>..., size=256) at tests/fuzz/fuzz_mimedecparseline.c:48
#13 0x0000555555e6c7d3 in runOneFile (fname=0x7fffffffe2a8 "/home/victor/Downloads/clusterfuzz-testcase-minimized-fuzz_mimedecparseline-5667327394054144") at tests/fuzz/onefile.c:39
#14 0x0000555555e6c526 in main (argc=2, argv=0x7fffffffdef8) at tests/fuzz/onefile.c:61
(gdb) l
39    in ./nptl/pthread_kill.c
(gdb) f 7
#7  0x0000555555ec52f0 in ProcessBase64BodyLine (buf=0x612000000064 ' ' <repeats 200 times>..., len=256, state=0x61f000000080) at util-decode-mime.c:1389
1389                DEBUG_VALIDATE_BUG_ON(state->bvr_len != 0);
(gdb)

OSS-Fuzz reference link: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=54085