Bug 1424492

GSS confirmed the corefx patch indeed fixes the problem:

https://github.com/dotnet/corefx/commit/60d1b3d22eca28ca3dfe375d0cefd2bd16059261

[tester@rhel7-x64 hello-world2]$ cat Program.cs  || [tester@rhel7-x64 hello-world]$ cat Program.cs 

using System;
using System.IO;

namespace ConsoleApplication
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
File.WriteAllText(@"/mnt/nfs_share/tetest.txt", "TextToWrite");
            Console.WriteLine("Hello World!");
        }
    }
}


[tester@rhel7-x64 hello-world2]$ rpm -qa | grep dotnet
rh-dotnetcore10-dotnetcore-1.0.3-3.el7.x86_64
rh-dotnetcore10-runtime-1.0-4.el7.x86_64
rh-dotnetcore10-libuv-1.9.0-1.el7.x86_64
rh-dotnetcore10-1.0-4.el7.x86_64
rh-dotnetcore10-libcurl-7.47.1-4.el7.x86_64

[tester@rhel7-x64 hello-world2]$ scl enable rh-dotnetcore10 -- dotnet run
Project hello-world2 (.NETCoreApp,Version=v1.0) will be compiled because expected outputs are missing
Compiling hello-world2 for .NETCoreApp,Version=v1.0

Compilation succeeded.
    0 Warning(s)
    0 Error(s)

Time elapsed 00:00:00.8768346
 

Hello World!

Unhandled Exception: System.UnauthorizedAccessException: Access to the path '/mnt/nfs_share/tetest.txt' is denied. ---> System.IO.IOException: Bad file descriptor
   --- End of inner exception stack trace ---
   at System.IO.UnixFileStream.CheckFileCall(Int64 result, Boolean ignoreNotSupported)
   at System.IO.UnixFileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, FileStream parent)
   at System.IO.UnixFileSystem.Open(String fullPath, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, FileStream parent)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options)
   at System.IO.File.InternalWriteAllText(String path, String contents, Encoding encoding)
   at System.IO.File.WriteAllText(String path, String contents)
   at ConsoleApplication.Program.Main(String[] args)




[tester@rhel7-x64 ~]$ rpm -qa | grep dotnet
rh-dotnetcore10-1.0-4.el7.x86_64
rh-dotnetcore10-libuv-1.9.0-1.el7.x86_64
rh-dotnetcore10-dotnetcore-1.0.4-1.el7.x86_64
rh-dotnetcore10-runtime-1.0-4.el7.x86_64
rh-dotnetcore10-libcurl-7.47.1-4.el7.x86_64
[tester@rhel7-x64 ~]$ scl enable rh-dotnetcore10 -- dotnet --version
1.0.0-preview2-003157


[tester@rhel7-x64 hello-world]$ scl enable rh-dotnetcore10 -- dotnet run
Project hello-world (.NETCoreApp,Version=v1.0) will be compiled because inputs were modified
Compiling hello-world for .NETCoreApp,Version=v1.0

Compilation succeeded.
    0 Warning(s)
    0 Error(s)

Time elapsed 00:00:00.8816610
 

Hello World!
Hello World!





Where /mnt/nfs_share/ is:

[tester@rhel7-x64 hello-world2]$ df -h
Filesystem             Size  Used Avail Use% Mounted on
...
tmpfs                  1.0G  4.0K  1.0G   1% /mnt/export
localhost:/mnt/export  1.0G     0  1.0G   0% /mnt/nfs_share

[tester@rhel7-x64 hello-world2]$ cat /etc/exports
/mnt/export *(fsid=25,rw,sync)

and mnt/export is mount --bind ramdisk at /mnt/rmadisk2  accessible as 777:

-rw-rw-r-- 1 tester tester 5 Mar 14 12:32 aaa
-rwxrw-r-- 1 tester tester 0 Mar 14 12:42 tetest.txt
[tester@rhel7-x64 hello-world2]$ ll /mnt/nfs_share/
total 4
-rw-rw-r-- 1 tester tester 5 Mar 14 12:32 aaa
-rwxrw-r-- 1 tester tester 0 Mar 14 12:42 tetest.txt
[tester@rhel7-x64 hello-world2]$ ll /mnt/ramdisk2/
total 4
-rw-rw-r-- 1 tester tester 5 Mar 14 12:32 aaa
-rwxrw-r-- 1 tester tester 0 Mar 14 12:42 tetest.txt


[tester@rhel7-x64 hello-world2]$ ll /mnt
total 0
drwxrwxrwt 2 root   root  80 Mar 14 12:42 export
drwxrwxrwt 2 root   root  80 Mar 14 12:42 nfs_share
drwxrwxrwt 2 root   root  80 Mar 14 12:42 ramdisk2

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2017-0519.html