[llvm-bugs] [Bug 30214] New: signed integer in libfuzzer

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30214

            Bug ID: 30214
           Summary: signed integer in libfuzzer
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: nlewycky at google.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Here's a transcript showing the bug:

localhost ~ # cat fuzz-2.log
INFO: Seed: 781050651
INFO: -max_len is not provided, using 171
#0      READ   units: 54 exec/s: 0
#54     INITED cov: 87 bits: 97 indir: 7 units: 45 exec/s: 0
#2048   pulse  cov: 87 bits: 97 indir: 7 units: 45 exec/s: 1024
#4096   pulse  cov: 87 bits: 97 indir: 7 units: 45 exec/s: 1024
#8192   pulse  cov: 87 bits: 97 indir: 7 units: 45 exec/s: 1170
#16384  pulse  cov: 87 bits: 97 indir: 7 units: 45 exec/s: 1092
#32768  pulse  cov: 87 bits: 97 indir: 7 units: 45 exec/s: 1092
#65536  pulse  cov: 87 bits: 97 indir: 7 units: 45 exec/s: 1040
#131072 pulse  cov: 87 bits: 97 indir: 7 units: 45 exec/s: 1048
#262144 pulse  cov: 87 bits: 97 indir: 7 units: 45 exec/s: 1057
#524288 pulse  cov: 87 bits: 97 indir: 7 units: 45 exec/s: 1046
#1048576        pulse  cov: 87 bits: 97 indir: 7 units: 45 exec/s: 1044
#2097152        pulse  cov: 87 bits: 97 indir: 7 units: 45 exec/s: 1032
#4194304        pulse  cov: 87 bits: 97 indir: 7 units: 45 exec/s: 1024
#8388608        pulse  cov: 87 bits: 97 indir: 7 units: 45 exec/s: 1028
#16777216       pulse  cov: 87 bits: 97 indir: 7 units: 45 exec/s: 1032
#33554432       pulse  cov: 87 bits: 97 indir: 7 units: 45 exec/s: 1033
#34193474       NEW    cov: 87 bits: 98 indir: 7 units: 46 exec/s: 1033 L: 157
MS: 5 ShuffleBytes-ChangeByte-CrossOver-ChangeBit-AddFromTempAutoDict- DE: "hop
count"-
#34875071       NEW    cov: 87 bits: 99 indir: 7 units: 47 exec/s: 1034 L: 167
MS: 2 InsertByte-AddFromPersAutoDict- DE: "hop count"-
#52917112       NEW    cov: 87 bits: 100 indir: 7 units: 48 exec/s: 1043 L: 143
MS: 3 CrossOver-ChangeASCIIInt-AddFromTempAutoDict- DE: "sample size"-
#53180549       NEW    cov: 87 bits: 101 indir: 7 units: 49 exec/s: 1043 L: 163
MS: 5 ChangeASCIIInt-AddFromPersAutoDict-ChangeASCIIInt-InsertByte-CrossOver-
DE: "sample size"-
#61760491       NEW    cov: 87 bits: 102 indir: 7 units: 50 exec/s: 1045 L: 147
MS: 2 InsertByte-AddFromTempAutoDict- DE: "hop count"-
#67108864       pulse  cov: 87 bits: 102 indir: 7 units: 50 exec/s: 1047
#102707549      NEW    cov: 87 bits: 103 indir: 7 units: 51 exec/s: 1056 L: 171
MS: 5 ChangeASCIIInt-ChangeByte-ChangeASCIIInt-ShuffleBytes-CrossOver-
#134217728      pulse  cov: 87 bits: 103 indir: 7 units: 51 exec/s: 1064
#172110166      NEW    cov: 87 bits: 104 indir: 7 units: 52 exec/s: 1070 L: 153
MS: 2 CrossOver-AddFromTempAutoDict- DE: "hop count"-
#268435456      pulse  cov: 87 bits: 104 indir: 7 units: 52 exec/s: 1076
#536870912      pulse  cov: 87 bits: 104 indir: 7 units: 52 exec/s: 1082
#1073741824     pulse  cov: 87 bits: 104 indir: 7 units: 52 exec/s: 1084
#-2147483648    pulse  cov: 87 bits: 104 indir: 7 units: 52 exec/s: 1083

The last counter prints negative.

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