teemperor added a comment.

I ran it a few times and I'm sure it's an actual '"the output didn't show up" 
timeout and not a random failure. I also checked and my node doesn't have an 
`.editrc` file or something like that on the node. It's failing on a different 
Arch Linux bot so I think it's not a borked machine.

Arch should use just the vanilla libedit so I am not sure why it would be 
different from other distros. IIRC I ran all the tests when I first reviewed 
this, so I am also a bit confused why this is now failing. When I manually 
input unicode characters into the old and new prompt both seem to work, so 
maybe it's the pexpect test setup that is somehow dropping the input?

On a side note: I think this patch actually breaks the way backspace works. 
With this patch applied, if I enter a command such as '∂∂∂∂∂∂∂∂∂' and then 
press backspace, the cursor is now moved to the right by (what I assume) is the 
amount of bytes that I entered. I think there is some strlen logic going on 
that isn't unicode aware. See below: F18365237: Screenshot 2021-08-05 at 
11.51.41.png <https://reviews.llvm.org/F18365237>

In D106035#2927847 <https://reviews.llvm.org/D106035#2927847>, @nealsid wrote:

> :) Shoot.  I definitely want to revert ASAP rather than keep the tree in a 
> bad state.  Just curious, since there are timeout messages in the log, would 
> you be able to try rerunning just that one? I see this, too: 0: b"error: 
> '\xe1\x88\xb4' is not a valid command. So I'm guessing the timeout is a red 
> herring.
>
> I'll create an Arch VM to test on for future patches.  Thank you and sorry 
> about that.
>
> In D106035#2927817 <https://reviews.llvm.org/D106035#2927817>, @teemperor 
> wrote:
>
>> I fear I might also have to congratulate you on your first revert (sorry, 
>> couldn't resist that joke). TestUnicode is failing for me with this patch on 
>> Arch Linux:
>>
>>   Command Output (stdout):
>>   --
>>   lldb version 14.0.0 (g...@github.com:Teemperor/llvm-project revision 
>> f9f63e92243ecd6d0df5d6813967a49c8ca79ca5)
>>     clang revision f9f63e92243ecd6d0df5d6813967a49c8ca79ca5
>>     llvm revision f9f63e92243ecd6d0df5d6813967a49c8ca79ca5
>>   Skipping the following test categories: ['libc++', 'dsym', 'gmodules', 
>> 'debugserver', 'objc']
>>   
>>   --
>>   Command Output (stderr):
>>   --
>>   FAIL: LLDB (/home/teemperor/work/ci/build/bin/clang-x86_64) :: 
>> test_unicode_input (TestUnicode.TestCase)
>>   ======================================================================
>>   ERROR: test_unicode_input (TestUnicode.TestCase)
>>   ----------------------------------------------------------------------
>>   Traceback (most recent call last):
>>     File 
>> "/home/teemperor/work/ci/llvm-project/lldb/third_party/Python/module/pexpect-4.6/pexpect/expect.py",
>>  line 111, in expect_loop
>>       incoming = spawn.read_nonblocking(spawn.maxread, timeout)
>>     File 
>> "/home/teemperor/work/ci/llvm-project/lldb/third_party/Python/module/pexpect-4.6/pexpect/pty_spawn.py",
>>  line 482, in read_nonblocking
>>       raise TIMEOUT('Timeout exceeded.')
>>   pexpect.exceptions.TIMEOUT: Timeout exceeded.
>>   
>>   During handling of the above exception, another exception occurred:
>>   
>>   Traceback (most recent call last):
>>     File 
>> "/home/teemperor/work/ci/llvm-project/lldb/packages/Python/lldbsuite/test/decorators.py",
>>  line 149, in wrapper
>>       return func(*args, **kwargs)
>>     File 
>> "/home/teemperor/work/ci/llvm-project/lldb/test/API/iohandler/unicode/TestUnicode.py",
>>  line 25, in test_unicode_input
>>       self.expect(u'\u1234', substrs=[u"error: '\u1234' is not a valid 
>> command.".encode('utf-8')])
>>     File 
>> "/home/teemperor/work/ci/llvm-project/lldb/packages/Python/lldbsuite/test/lldbpexpect.py",
>>  line 64, in expect
>>       self.child.expect_exact(s)
>>     File 
>> "/home/teemperor/work/ci/llvm-project/lldb/third_party/Python/module/pexpect-4.6/pexpect/spawnbase.py",
>>  line 418, in expect_exact
>>       return exp.expect_loop(timeout)
>>     File 
>> "/home/teemperor/work/ci/llvm-project/lldb/third_party/Python/module/pexpect-4.6/pexpect/expect.py",
>>  line 119, in expect_loop
>>       return self.timeout(e)
>>     File 
>> "/home/teemperor/work/ci/llvm-project/lldb/third_party/Python/module/pexpect-4.6/pexpect/expect.py",
>>  line 82, in timeout
>>       raise TIMEOUT(msg)
>>   pexpect.exceptions.TIMEOUT: Timeout exceeded.
>>   <pexpect.pty_spawn.spawn object at 0x7f004e20a610>
>>   command: /home/teemperor/work/ci/build/bin/lldb
>>   args: ['/home/teemperor/work/ci/build/bin/lldb', '--no-lldbinit', 
>> '--no-use-colors', '-O', 'settings clear -all', '-O', 'settings set 
>> symbols.enable-external-lookup false', '-O', 'settings set 
>> target.inherit-tcc true', '-O', 'settings set target.detach-on-error false', 
>> '-O', 'settings set target.auto-apply-fixits false', '-O', 'settings set 
>> plugin.process.gdb-remote.packet-timeout 60', '-O', 'settings set 
>> symbols.clang-modules-cache-path 
>> "/home/teemperor/work/ci/build/lldb-test-build.noindex/module-cache-lldb/lldb-api"',
>>  '-O', 'settings set use-color false', '-O', 'setting set 
>> target.prefer-dynamic-value no-dynamic-values']
>>   buffer (last 100 chars): b'\\U+1234\r\n(lldb) '
>>   before (last 100 chars): b'\\U+1234\r\n(lldb) '
>>   after: <class 'pexpect.exceptions.TIMEOUT'>
>>   match: None
>>   match_index: None
>>   exitstatus: None
>>   flag_eof: False
>>   pid: 609226
>>   child_fd: 6
>>   closed: False
>>   timeout: 60
>>   delimiter: <class 'pexpect.exceptions.EOF'>
>>   logfile: None
>>   logfile_read: None
>>   logfile_send: None
>>   maxread: 2000
>>   ignorecase: False
>>   searchwindowsize: None
>>   delaybeforesend: 0.05
>>   delayafterclose: 0.1
>>   delayafterterminate: 0.1
>>   searcher: searcher_string:
>>       0: b"error: '\xe1\x88\xb4' is not a valid command."
>>   Config=x86_64-/home/teemperor/work/ci/build/bin/clang
>>   ----------------------------------------------------------------------
>>   Ran 1 test in 60.551s




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