openssh unix dev - Sep 2003 - SCO 3.2v4.2 and OpenSSH -current --> connection hangs and does no t close

Greetings,

I have a problem with OpenSSH -current and SCO 3.2v4.2,
when I execute a remote command or exit from a session,
the connection hangs, ( line 326 of serverloop.c).

This problem only exists when using ssh2.

server side debug (-d -d -d ):
debug1: Received SIGCHLD.
debug2: channel 0: read failed
debug2: channel 0: close_read
debug2: channel 0: input open -> drain
debug2: channel 0: ibuf_empty delayed efd 12/(0)
debug2: notify_done: reading
debug2: channel 0: read 0 from efd 12
debug2: channel 0: closing read-efd 12
debug2: channel 0: ibuf empty
debug2: channel 0: send eof
debug2: channel 0: input drain -> closed
-------------------

I have tried my hand at gdb, and this is the output and backtrace
before the session hangs.

(gdb)
wait_until_can_do_something (readsetp=0x7ffff8e4, writesetp=0x7ffff8e0,
    maxfdp=0x7ffff8dc, nallocp=0x7ffff8d8, max_time_milliseconds=0)
    at serverloop.c:313
313             if (child_terminated &&
packet_not_very_much_data_to_write())
(gdb)
317             if (max_time_milliseconds == 0)
(gdb)
318                     tvp = NULL;
(gdb)
326             ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
(gdb) p connection_closed
$1 = 0
(gdb) bt
#0  wait_until_can_do_something (readsetp=0x7ffff8e4, writesetp=0x7ffff8e0,
    maxfdp=0x7ffff8dc, nallocp=0x7ffff8d8, max_time_milliseconds=0)
    at serverloop.c:326
#1  0x8bfc in server_loop2 (authctxt=0x42f91c) at serverloop.c:771
#2  0x1030f in do_authenticated2 (authctxt=0x42f91c) at session.c:2086
#3  0xcc19 in do_authenticated (authctxt=0x42f91c) at session.c:216
#4  0x2eaa in main (ac=6, av=0x7ffffe28) at sshd.c:1506
(gdb) s

at this point the connection this hangs.

I do not know how to process from here, please advise

Vikash

- (bal) redo how we handle 'mysignal()'.  Move it to
   openbsd-compat/bsd-misc.c, s/mysignal/signal/ and #define signal to
   be our 'mysignal' by default.  OK djm@

go into bsd-misc.c and comment out the define and try it again.  We should
be using mysignal by default now, but it may have disagreeable results.

- Ben

On Mon, 15 Sep 2003, Vikash Badal - PCS wrote:
> Greetings,
>
> I have a problem with OpenSSH -current and SCO 3.2v4.2,
> when I execute a remote command or exit from a session,
> the connection hangs, ( line 326 of serverloop.c).
>
> This problem only exists when using ssh2.
>
> server side debug (-d -d -d ):
> debug1: Received SIGCHLD.
> debug2: channel 0: read failed
> debug2: channel 0: close_read
> debug2: channel 0: input open -> drain
> debug2: channel 0: ibuf_empty delayed efd 12/(0)
> debug2: notify_done: reading
> debug2: channel 0: read 0 from efd 12
> debug2: channel 0: closing read-efd 12
> debug2: channel 0: ibuf empty
> debug2: channel 0: send eof
> debug2: channel 0: input drain -> closed
> -------------------
>
> I have tried my hand at gdb, and this is the output and backtrace
> before the session hangs.
>
> (gdb)
> wait_until_can_do_something (readsetp=0x7ffff8e4, writesetp=0x7ffff8e0,
>     maxfdp=0x7ffff8dc, nallocp=0x7ffff8d8, max_time_milliseconds=0)
>     at serverloop.c:313
> 313             if (child_terminated &&
> packet_not_very_much_data_to_write())
> (gdb)
> 317             if (max_time_milliseconds == 0)
> (gdb)
> 318                     tvp = NULL;
> (gdb)
> 326             ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL,
tvp);
> (gdb) p connection_closed
> $1 = 0
> (gdb) bt
> #0  wait_until_can_do_something (readsetp=0x7ffff8e4, writesetp=0x7ffff8e0,
>     maxfdp=0x7ffff8dc, nallocp=0x7ffff8d8, max_time_milliseconds=0)
>     at serverloop.c:326
> #1  0x8bfc in server_loop2 (authctxt=0x42f91c) at serverloop.c:771
> #2  0x1030f in do_authenticated2 (authctxt=0x42f91c) at session.c:2086
> #3  0xcc19 in do_authenticated (authctxt=0x42f91c) at session.c:216
> #4  0x2eaa in main (ac=6, av=0x7ffffe28) at sshd.c:1506
> (gdb) s
>
> at this point the connection this hangs.
>
> I do not know how to process from here, please advise
>
> Vikash
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