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From: Ken Brown <kbrown AT cornell DOT edu>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: Re: Regression (last snapshot)
Date: Fri, 26 Jul 2019 22:12:43 +0000
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On 7/22/2019 2:47 PM, Houder wrote:
> The specific regression as reported, has gone.
> 
> 64-@@ uname -a
> CYGWIN_NT-6.1 Seven 3.1.0s(0.339/5/3) 2019-07-22 16:43 x86_64 Cygwin
> 64-@@ ls -lL <(grep bash .bashrc)
> pr-------- 1 Henri None 0 Jul 22 20:36 /dev/fd/63

It turns out that this isn't completely fixed, but I only see the problem when 
working under X11, and the error message is different.  Here are the complete 
reproduction steps:

1. Start the X server by using the XWin Server shortcut.

2. Use the X Applications Menu -> System Tools to start an xterm window.

3. In that window, execute the above 'ls' command.:

$ ls -lL <(grep bash .bashrc)
pr-------- 1 kbrown None 0 2019-07-26 17:24 /dev/fd/63
grep: write error: Broken pipe

This is with the 2019-07-22 snapshot.  With the 2019-07-25 snapshot, it's better 
but still broken: I have to run the ls command twice to get the error:

$ ls -lL <(grep bash .bashrc)
pr-------- 1 kbrown None 0 2019-07-26 17:39 /dev/fd/63

$ ls -lL <(grep bash .bashrc)
pr-------- 1 kbrown None 0 2019-07-26 17:39 /dev/fd/63
grep: write error: Broken pipe

Here's one more fact, which may or not provide further clues: When I exited the 
X server while testing the 2019-07-22 snapshot, there was a /bin/sh process 
still running that I couldn't kill with 'kill -9'.  I had to kill it with the 
Task Manager.

Finally, here's an excerpt from the strace output for the failing ls command:

    24   23441 [main] ls 1033 fhandler_proc::get_proc_fhandler: 
get_proc_fhandler(/proc/1033/fd/63)
    25   23466 [main] ls 1033 mount_info::conv_to_win32_path: src_path 
/proc/1033/fd/63, dst /proc/1033/fd/63, flags 0x0, rc 0
    28   23494 [main] ls 1033 build_fh_pc: fh 0x180340098, dev 000000FB
    24   23518 [main] ls 1033 fhandler_process::exists: exists (/proc/1033/fd/63)
    28   23546 [main] ls 1033 __set_errno: cygheap_fdget::cygheap_fdget(int, 
bool, bool):679 setting errno 9
    24   23570 [main] ls 1033 __set_errno: off_t format_process_fd(void*, 
char*&):394 setting errno 2

I'm in the process of building an unoptimized cygwin1.dll to see if I can get 
further information.

Ken

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