sshd: fork of unprivileged child failed

Larry Hall (Cygwin) reply-to-list-only-lh@cygwin.com
Sun Jun 4 23:25:00 GMT 2006


Robin Walker wrote:
> I have a system with Cygwin sshd installed that refuses to accept 
> connections.  sshd is running and listening on port 22.
> 
> In the Windows Application Log there are, for each failed connection 
> attempt, entries of the form:
> 
> sshd: PID xxxx: fatal: fork of unprivileged child failed.
> 
> In sshd.log there are entries of the form:
> 
>   1893 [main] sshd 7720 C:\cygwin\usr\sbin\sshd.exe: *** fatal error - 
> recreate_mmaps_after_fork_failed
>      9 [main] sshd 6788 child_copy: stack write copy failed, 
> 0x23DDA0..0x240000, done 0, windows pid 2350292, Win32 error 5
>      7 [main] sshd 6344 fhandler_dev_zero::fixup_mmap_after_fork: 
> requested 0x3F0000 != 0x0 mem alloc base 0x3F0000, state 0x1000, size 
> 4096, Win32 error 487
>   2029 [main] sshd 6344 C:\cygwin\usr\sbin\sshd.exe: *** fatal error - 
> recreate_mmaps_after_fork_failed
>      8 [main] sshd 7868 child_copy: stack write copy failed, 
> 0x23DDA0..0x240000, done 0, windows pid 2350292, Win32 error 5
>      6 [main] sshd 6872 fhandler_dev_zero::fixup_mmap_after_fork: 
> requested 0x3F0000 != 0x0 mem alloc base 0x3F0000, state 0x1000, size 
> 4096, Win32 error 487
>   2487 [main] sshd 6872 C:\cygwin\usr\sbin\sshd.exe: *** fatal error - 
> recreate_mmaps_after_fork_failed
>     10 [main] sshd 6336 child_copy: stack write copy failed, 
> 0x23DDA0..0x240000, done 0, windows pid 2350292, Win32 error 5
> 
> 
> Attempts by client ssh programs to connect are given:
> Read from socket failed: Connection reset by peer
> 
> This happens even for ssh 127.0.0.1 on the server itself.
> 
> What do I need to do to get this sshd working?
> 
> The first time this fault ever occurred on this system, a "rebaseall" 
> cured it.  But the fault has returned some months later, and a 
> "rebaseall" no longer fixes it.
> 


Did you try a recent snapshot?  Otherwise, let's start back at the beginning.
Please read and follow the problem reporting guidelines found at:

<http://cygwin.com/problems.html>

Think about things that have changed about the time things stopped working
for you.  This includes things both a part of and external to Cygwin.

-- 
Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
838 Washington Street                   (508) 893-9889 - FAX
Holliston, MA 01746

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