I'm using ConEmu version 180206 preview to have some decent terminal on Windows with tabs support. Works very good on most part of the time.

But I'm having an error that occurs almost every time I commit changes after a merge conflict on Git. The error:

λ git commit
hint: Waiting for your editor to close the file...       0 [main] vim 7956 C:\Program Files\cmder\vendor\git-for-windows\usr\bin\vim.exe: *** fatal error - cmalloc would have returned NULL
   1839 [main] vim 7956 cygwin_exception::open_stackdumpfile: Dumping stack trace to vim.exe.stackdump
[feat/my-branch 7b0d482] Merge branch 'develop' into feat/my-branch

Even with the error, the commit is done correctly.

I don't know if the default git conflict message is a problem (I will investigate further in the next time that the error occur, maybe the single quotes cause this...), but follows this format:

Merge branch 'develop' into feat/my-branch

I visited some discussions about this problem and the only tip that I could extract from these discussions is reduce the buffer height (my actual value is 5000) but this solution not work for me.

So, what alternative I had to resolve this problem?

  • 2
    Not only buffer height matters. Decrease width and height of the window, decrease buffer height, open RealConsole and check result sizes. The bug is definitely somewhere in cygwin implementation of pty, it fails on large consoles. This should be reported to Cygwin team.
    – Maximus
    Apr 3, 2018 at 13:55

1 Answer 1


I saw a similar error using windows dos console - and reducing the console buffer size to a more sane 25 lines and 120 chars wide sorted it out. It's not conemu alone.

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