ag 2 <(echo 2) gets assertion "p >= path" failed: .. /cygwin-3.1.7 ... /cygwin/path.cc", line 3065, function: int symlink_info::check

[David Dyck]

This command triggers an assertion failure
  "ag" is from the_silver_searcher

$ ag 2 <(echo 2)
assertion "p >= path" failed: file
"/home/corinna/src/cygwin/cygwin-3.1.7/cygwin-3.1.7-1.x86_64/src/newlib-cygwin/winsup/cygwin/path.cc",
line 3065, function: int symlink_info::check(char*, const
suffix_info*, fs_info&, path_conv_handle&)
Aborted (core dumped)

 3473k 2020/08/22 C:\cygwin64\bin\cygwin1.dll
    Cygwin DLL version info:
        DLL version: 3.1.7
bash                                    4.4.12-3                        OK
the_silver_searcher                     2.2.0-1                         OK

Wrapping in "bash -c" gives identical results ( see above)
$ /usr/bin/bash -c '/usr/bin/ag 2 <(echo 2)'

Turning on some "ag" debugging reveals worker threads and the
"special" /dev/fd/63 file handle creation ( used with bash "Process
Substitution" )

$ /usr/bin/bash -c '/usr/bin/ag -D 2 <(echo 2)'
 ....
DEBUG: Query is 2
DEBUG: PCRE Version: 8.44 2020-02-12
DEBUG: Using 7 workers
DEBUG: Thread 0 set to CPU 0
DEBUG: Thread 1 set to CPU 1
DEBUG: Worker 1 started
DEBUG: Worker 0 started
 ...
DEBUG: searching path /dev/fd/63 for 2
assertion "p >= path" failed: file
"/home/corinna/src/cygwin/cygwin-3.1.7/cygwin-3.1.7-1.x86_64/src/newlib-cygwin/winsup/cygwin/path.cc",
line 3065, function: int symlink_info::check(char*, const
suffix_info*, fs_info&, path_conv_handle&)
Aborted (core dumped)


I expected behaviour like ack

$ ack 2 <(echo 2)
2

Noticed that input from pipe works

$ echo 2 | ag 2
2

I've reported this on github as an "ag" bug, but I think it is a bug in cygwin
   https://github.com/ggreer/the_silver_searcher/issues/1408

I would appreciate hearing if someone else can reproduce this issue in
3.1.7 or later dll
  ( 3.1.6 seems to hang )

Attached cygcheck.out
  UserName and HostName substituted into cygcheck.out
  one environment variable deleted
---
-------------- next part --------------
A non-text attachment was scrubbed...
Name: cygcheck.out
Type: application/octet-stream
Size: 152931 bytes
Desc: not available
URL: <https://cygwin.com/pipermail/cygwin/attachments/20200906/17caa609/attachment-0001.obj>