[Bug 265087] Changes to pipe/socket handling causes configure test program to loop endless

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265087

            Bug ID: 265087
           Summary: Changes to pipe/socket handling causes configure test
                    program to loop endless
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: rz-rpi03@h-ka.de
 Attachment #235121 text/plain
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Created attachment 235121
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=235121&action=edit
Extraced "checking read/send-side pipe system..." C program

Hello,

recent changes in CURRENT causes the Dante socks client to fail.
Usually this could be fixed simply by recompiling and reinstalling net/dante.

This time it failed because the configure script stops at
"checking read/send-side pipe system..."

Investigation shows that the C program executed loops forever.

Trying to bisect CURRENT stops for me at
716fd348e01c5f2ba125f878a634a753436c2994
because the boot zpool was upgraded meanwhile and an older CURRENT version
can not boot from such a pool.

716fd348e01c5f2ba125f878a634a753436c2994 does expose the new (loop) behavior
as well, so the cause for the endless loop must be earlier.

Adding some additional fprintf's showed that the C program does not exit
the wile(1)-loop in sendtest() at the first call of sendtest().

Ralf

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