sessions -i n ; ctrl+z; make the session back have error.

[gleader at gmail.com (gleader)]

sessions -i 1
meterpreter >  ctrl+z   make  back but have error.
-------------   the error
message---------------------------------------------------------------
Background session 1? [y/N]
Background session 1? [y/N]  [-] Session manipulation failed: Interrupted
system call ["./lib/rex/ui/text/input/readline.rb:63:in `sysread'",
"./lib/rex/ui/text/input/readline.rb:63:in `sysread'",
"./lib/rex/ui/interactive.rb:238:in `prompt'",
"./lib/rex/ui/interactive.rb:246:in `prompt_yesno'",
"./lib/msf/core/session/interactive.rb:106:in `_suspend'",
"./lib/rex/ui/interactive.rb:209:in `handle_suspend'",
"./lib/rex/sync/thread_safe.rb:30:in `call'",
"./lib/rex/sync/thread_safe.rb:30:in `select'",
"./lib/rex/sync/thread_safe.rb:30:in `select'", "(eval):3:in `select'",
"./lib/rex/ui/text/input/readline.rb:102:in `pgets'",
"./lib/rex/ui/text/shell.rb:115:in `run'",
"./lib/rex/post/meterpreter/ui/console.rb:58:in `interact'",
"./lib/msf/base/sessions/meterpreter.rb:181:in `_interact'",
"./lib/rex/ui/interactive.rb:48:in `interact'",
"./lib/msf/ui/console/command_dispatcher/core.rb:738:in `cmd_sessions'",
"./lib/rex/ui/text/dispatcher_shell.rb:234:in `send'",
"./lib/rex/ui/text/dispatcher_shell.rb:234:in `run_command'",
"./lib/rex/ui/text/dispatcher_shell.rb:196:in `run_single'",
"./lib/rex/ui/text/dispatcher_shell.rb:191:in `each'",
"./lib/rex/ui/text/dispatcher_shell.rb:191:in `run_single'",
"./lib/rex/ui/text/shell.rb:125:in `run'", "./msfconsole:78"]
------------------------------------------------------------------------------------------------------------
the console exit meterpreter is ok but the console is not right.
the input IO will have question.some input char miss.
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