RE: EXTERNAL SENDER: RE: Fork errors

[Dale Lobb <Dale.Lobb@bryanhealth.org>]

> -----Original Message-----
> From: Jose Isaias Cabrera <jicman@outlook.com>
> Sent: Wednesday, September 6, 2023 4:01 PM
> To: Dale Lobb <Dale.Lobb@bryanhealth.org>; tryandbuy via Cygwin
> <cygwin@cygwin.com>
> Subject: EXTERNAL SENDER: RE: Fork errors
>
> On September 6, 2023 2:52 PM, Dale Lobb expressed:
> >
> > Since upgrading to the latest version of Cygwin a few weeks ago on a
> > server I manage, I've been experiencing an issue with fork errors.
> > The Cygwin installation had not been updated for almost a year
> > before that.
> >
> > The issue happens every time a script is invoked that purges files
> > from some temporary directories, but never in the same place in the
> > script.  The script uses multiple calls to find -exec to remove
> > files over 10 days old from the directories.  Here is a typical
> > error.  Sometime the issue will assert after just a  few tens of
> > files deleted, sometimes after hundreds or thousands of files have
> > been deleted:
> >
> > removed '/cygdrive/d/.../obfuscated.datedata.txt'
> > 1 [main] find 20066 dofork: child -1 - forked process 4068 died
> > unexpectedly, retry 0, exit code 0xC0000142, errno 11
> > find: cannot fork: Resource temporarily unavailable
> >
> > It also happens randomly at other times.  I've seen the bash shell
> > itself fail on the invocation of a mintty.  I've seen it happen on
> > all sorts of interactive commands entered from bash.
> >
> > Today, as a test, I updated all the installed Cygwin components.
> > One of the post installation scripts failed, so I re-exec'd it:
> >
> > $ ./postinstall/0p_update-info-dir.dash
> > Rebuilding info directory
> > 2 [main] dash 2059 dofork: child -1 - forked process 7676 died
> > unexpectedly, retry 0, exit code 0xC0000142, errno 11
> > ./postinstall/0p_update-info-dir.dash: 22: Cannot fork
> >
> > A second re-exec then worked fine.
> >
> > I've tried reinstalling all the components, and I've tried
> > rebaseall.
> >
> > Is there anything else I can try, or troubleshooting steps to
> > take?
> >
> > Best Regards,
>
> Take a look at this:
>
> https://stackoverflow.com/questions/36399041/cygwin-update-cause-error-could-not-fork-child-process-resource-temporarily-u
>
> it may not help, but it's something to look into.
>
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Hello Jose,

  Thank you for the reply.

  I read through the Stack Overflow post.  Unfortunately, Windows Server
2016 is based on an early version of Windows 10, which does not have the
"Windows Defender Security Center" app.  Only 2019 and later versions have
that feature.

  I did find this article and used the group policy editor to disable ASLR for
several Cygwin executables (ash, bash, find, rm), but that didn't make any
difference.

https://learn.microsoft.com/en-us/windows/security/threat-protection/override-mitigation-options-for-app-related-security-policies

Best Regards,

Dale Lobb



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