Msf::Post::File: readable? / exists? / read_file methods crash sessions with EOFError on Solaris

Reproduce the failure with a Solaris 10u2 solaris/x86/shell_reverse_tcp session and modules/post/solaris/gather/enum_packages.rb. Trace the calls through lib/msf/core/post/file.rb, lib/msf/core/post/solaris/system.rb, and the command-shell session files named in the stack trace. Done means readable?, exists?, and read_file no longer terminate the Solaris session with EOFError and the module completes.

1. Get a solaris/x86/shell_reverse_tcp session on Solaris (tested on Solaris 10u2)
2. Run a module which reads a file, or create a module which uses readable? / exists? / read_file

msf6 post(solaris/gather/enum_packages) > run
[*] 192.168.200.166 - Command shell session 3 closed.
[-] Post failed: EOFError EOFError
[-] Call stack:
[-]   /var/lib/gems/3.3.0/gems/rex-core-0.1.33/lib/rex/io/stream.rb:224:in `get_once'
[-]   /root/Desktop/metasploit-framework/lib/msf/base/sessions/command_shell.rb:668:in `shell_read'
[-]   /root/Desktop/metasploit-framework/lib/msf/core/session/provider/single_command_shell.rb:64:in `block (2 levels) in shell_read_until_token'
[-]   <internal:kernel>:187:in `loop'
[-]   /root/Desktop/metasploit-framework/lib/msf/core/session/provider/single_command_shell.rb:63:in `block in shell_read_until_token'
[-]   /var/lib/gems/3.3.0/gems/timeout-0.4.3/lib/timeout.rb:185:in `block in timeout'
[-]   /var/lib/gems/3.3.0/gems/timeout-0.4.3/lib/timeout.rb:38:in `handle_timeout'
[-]   /var/lib/gems/3.3.0/gems/timeout-0.4.3/lib/timeout.rb:194:in `timeout'
[-]   /root/Desktop/metasploit-framework/lib/msf/core/session/provider/single_command_shell.rb:60:in `shell_read_until_token'
[-]   /root/Desktop/metasploit-framework/lib/msf/core/session/provider/single_command_shell.rb:158:in `shell_command_token_base'
[-]   /root/Desktop/metasploit-framework/lib/msf/core/session/provider/single_command_shell.rb:130:in `shell_command_token_unix'
[-]   /root/Desktop/metasploit-framework/lib/msf/base/sessions/unix_escaping.rb:4:in `shell_command_token'
[-]   /root/Desktop/metasploit-framework/lib/msf/core/post/common.rb:197:in `cmd_exec'
[-]   /root/Desktop/metasploit-framework/lib/msf/core/post/file.rb:313:in `exist?'
[-]   /root/Desktop/metasploit-framework/lib/msf/core/post/file.rb:279:in `readable?'
[-]   /root/Desktop/metasploit-framework/lib/msf/core/post/file.rb:488:in `read_file'
[-]   /root/Desktop/metasploit-framework/lib/msf/core/post/solaris/system.rb:17:in `get_sysinfo'
[-]   /root/Desktop/metasploit-framework/modules/post/solaris/gather/enum_packages.rb:32:in `run'
[*] Post module execution completed