[Bug 207303] devel/m4: sporadic hangs on configure stage

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207303

            Bug ID: 207303
           Summary: devel/m4: sporadic hangs on configure stage
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: johans at FreeBSD.org
          Reporter: vsasjason at gmail.com
             Flags: maintainer-feedback?(johans at FreeBSD.org)
          Assignee: johans at FreeBSD.org

Created attachment 167145
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=167145&action=edit
make & truss output

I'm using portupagrade to update ports, and sometimes configuring devel/m4
hangs on the "checking dup2":
{...}
checking whether dup2 works... ^C0.006u 0.027s 6:42.60 0.0%     3316+612k
37+0io 0pf+0w

truss shows the following:
{...}
fcntl(1,F_SETFD,FD_CLOEXEC)                      = 0 (0x0)
dup2(0x1,0x1,0x1,0x18,0x300,0x7fffffffd6ef)      = 1 (0x1)
fcntl(1,F_GETFD,)                                = 1 (0x1)
close(0)                                         = 0 (0x0)
dup2(0x0,0x0,0x1,0x18,0x300,0x7fffffffd6ef)      ERR#9 'Bad file descriptor'
^C^C^C^C^C^C^C^C^CKilled
0.000u 0.003s 117:42:18.87 0.0% 0+0k 0+0io 0pf+0w

Process "conftest" hangs in a D state.

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