[erlang-bugs] ssh_sftp:stop_channel/1 tampers trap_exit flag

Ali Yakout <>
Sun Jun 19 09:33:53 CEST 2011


Hi,

I was facing a problem with ssh_sftp:stop_channel/1, while checking the code I noticed that it changes the trap_exit to be always true!

> stop_channel(Pid) ->
>    case process_info(Pid, [trap_exit]) of
>	[{trap_exit, Bool}] ->
>	    ...
>	    process_flag(trap_exit, Bool),


I think 'Pid' should have been self() instead.

> stop_channel(Pid) ->
>    case process_info(self(), [trap_exit]) of



Beside this issue, I'm getting a 'gen_server' noproc crash when trying to close the sftp channel...
The server complains with a strange message "Received oclose for nonexistent channel 0."


Any idea?

/Ali


Crash report below:
===================

14> {ok,Pid,Conn}=ssh_sftp:start_channel("myhost",22,[{user,"myuser"},{password,"mypass"}]).
{ok,<0.76.0>,<0.73.0>}
15> ssh_sftp:stop_channel(Pid).                                                                 
ok
16> 
=ERROR REPORT==== 18-Jun-2011::22:37:04 ===
** Generic server <0.73.0> terminating 
** Last message in was {ssh_msg,<0.74.0>,
                           {ssh_msg_disconnect,2,
                               "Received oclose for nonexistent channel 0.",
                               []}}
** When Server state == {state,client,<0.32.0>,undefined,<0.74.0>,
                            {connection,[],32784,[],[],1,undefined,undefined,
                                undefined,undefined,undefined,undefined},
                            0,
                            [{address,"myhost"},
                             {port,22},
                             {role,client},
                             {channel_pid,<0.32.0>},
                             {socket_opts,[inet6]},
                             {ssh_opts,
                                 [{host,"myhost"},
                                  {password,"mypass"},
                                  {user,"myuser"}]}],
                            undefined,true}
** Reason for termination == 
** {noproc,{gen_server,call,[undefined,which_children,infinity]}}

=ERROR REPORT==== 18-Jun-2011::22:37:04 ===
** Generic server <0.72.0> terminating 
** Last message in was {'EXIT',<0.73.0>,
                           {noproc,
                               {gen_server,call,
                                   [undefined,which_children,infinity]}}}
** When Server state == {state,client,<0.73.0>,<0.74.0>,undefined}
** Reason for termination == 
** {noproc,{gen_server,call,[undefined,which_children,infinity]}}



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