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Date: Sun, 24 Jan 2021 00:12:15 -0500
Message-ID: <CAETRzVJSYt3oBrqTmpD2EgqeTpWWyfNCh2sViXuKDDyHjdob6Q@mail.gmail.com>
Subject: Link/$PATH interaction problem
To: cygwin AT cygwin DOT com
From: Frank Eske via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Frank Eske <fne DOT bugzilla AT gmail DOT com>
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Sender: "Cygwin" <cygwin-bounces AT cygwin DOT com>

Similar to December's "cygwin1.dll > 3.1.4 Program execution fails if
(WSL-)symlink exists and is present in PATH", but it's still present in
3.1.6 and 3.1.7. While I can revert back to 3.1.4 (and 3.1.2,) links I have
created since then do not show up as links and are listed as owned by
UnknownUser and UnknownGroup. I have dozens of such links scattered
throughout, making revert testing impractical.

I keep scripts in /home/userid/bat, which is a link, and compiled programs
in /home/userid/bin, which is a simple directory. My PATH begins with
.:/home/userid/bat:/home/userid/bin:... Problems started when I changed the
/home/userid/bat link. After the change, none of the programs in
/home/userid/bin worked. They would just return. Running them with gdb,
they would fail to start (During startup program exited with code
0xc000079) /usr/bin/ programs continued to operate normally.

My relevant links are as follows:
/C -> /cygdrive/c
/home/data -> /C/home/data
/home/userid/bat -> /home/data/home/bat

Currently my /home/userid/bat link is owned by Administrators:None, as
restored by backup software. If I replace it, programs in /home/userid/bin
do not run. If I add ANY other new link to the beginning of $PATH, none of
my compiled programs anywhere run. Adding at the end does not cause any
detectable problem.

With a PATH containing a beginning link: ldd ~/bin/program yields:
   ntdll.dll => ,,,
   KERNEL32.DLL => ...
   KERNELBASE.dll => ...

Without leading link items (except for the restored link), ldd
~/bin/program additionally yields:
   cygwin1.dll => ,,,
   (and sometimes more)

Let me know if you need further information.
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