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https://issues.apache.org/jira/browse/VCL-616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13450912#comment-13450912
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Dmitri Chebotarov commented on VCL-616:
---------------------------------------

I've encountered this problem with latest Cygwin 1.7.16-1. To fix the issue it 
I've modified update_cygwin.cmd script. Diff is below.
This should work with older Cygwin versions, but I haven't tested it.

# diff update_cygwin.cmd update_cygwin.cmd.BKP-2012-09-07 
118c118
< C:\Cygwin\bin\bash -c '/bin/ssh-keygen.exe -t rsa1 -f /etc/ssh_host_key -N 
""' 2>&1
---
> C:\Cygwin\bin\ssh-keygen.exe -t rsa1 -f /etc/ssh_host_key -N "" 2>&1
124c124
< C:\Cygwin\bin\bash -c '/bin/ssh-keygen.exe -t rsa -f /etc/ssh_host_rsa_key -N 
""' 2>&1
---
> C:\Cygwin\bin\ssh-keygen.exe -t rsa -f /etc/ssh_host_rsa_key -N "" 2>&1
130c130
< C:\Cygwin\bin\bash -c '/bin/ssh-keygen.exe -t dsa -f /etc/ssh_host_dsa_key -N 
""' 2>&1
---
> C:\Cygwin\bin\ssh-keygen.exe -t dsa -f /etc/ssh_host_dsa_key -N "" 2>&1


                
> update_cygwin.cmd fails to generate keys with current version of Cygwin
> -----------------------------------------------------------------------
>
>                 Key: VCL-616
>                 URL: https://issues.apache.org/jira/browse/VCL-616
>             Project: VCL
>          Issue Type: Bug
>    Affects Versions: 2.3
>            Reporter: Andy Kurth
>            Assignee: Andy Kurth
>             Fix For: 2.3.1
>
>
> The current version of Cygwin has a bug which causes update_cygwin.cmd to 
> fail.  When ssh-keygen.exe is run from a normal non-Cygwin command prompt, 
> the following occurs:
> C:\cygwin\home\root\VCL\Scripts>C:\Cygwin\bin\ssh-keygen.exe -t rsa1 -f 
> C:\cygwin\etc\ssh_host_key -N ""
> Generating public/private rsa1 key pair.
>       8 [main] ssh-keygen 224 exception::handle: Exception: 
> STATUS_ACCESS_VIOLATION
>    2114 [main] ssh-keygen 224 open_stackdumpfile: Dumping stack trace to 
> ssh-keygen.exe.stackdump
>   61325 [main] ssh-keygen 224 exception::handle: Exception: 
> STATUS_ACCESS_VIOLATION
>   68272 [main] ssh-keygen 224 exception::handle: Error while dumping state 
> (probably corrupted stack)
> Running rebaseall doesn't help.  The command succeeds if run from a Cygwin 
> shell.

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