[lldb-dev] [Bug 22611] New: invalid prompt in AbbreviationsTestCase.test_nonrunning_command_abbreviations test - apparent thread race condition

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22611

            Bug ID: 22611
           Summary: invalid prompt in
                    AbbreviationsTestCase.test_nonrunning_command_abbrevia
                    tions test - apparent thread race condition
           Product: lldb
           Version: unspecified
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at cs.uiuc.edu
          Reporter: emaste at freebsd.org
    Classification: Unclassified

Looking at test failures on FreeBSD I came across one relating to prompt
setting.

Found by:

dotest.py --executable /data/emaste/src/llvm/build/bin/lldb -C /usr/bin/clang
-v -t -f AbbreviationsTestCase.test_nonrunning_command_abbreviations

which produced the following:
...
(lldb) settings set prompt "[with-three-trailing-spaces]   "
runCmd: com sou ./change_prompt.lldb
output: 

runCmd: settings show prompt
output: prompt (string) =
"\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645\037777777645"

Expecting start string: prompt (string) = "[with-three-trailing-spaces]   "
Not matched

While trying to reproduce this manually I found that short prompts generally
work, but longer prompts fail:

(lldb) settings set prompt "1234567890123456789012"
1234567890123456789012settings set prompt "12345678901234567890123"
¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥¥

On FreeBSD-11 (the development branch) malloc has "opt.junk" enabled by
default, which fills uninitialized allocated memory with 0xa5 and deallocated
memory with 0x5a; the ¥ character is 0xa5.

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