SSH connection hanging on logout

[Markus Friedl]

On Fri, May 18, 2001 at 05:18:22AM -0000, John Bowman wrote:
> > > > 	debug3: channel 0: channel data: 16384
> > > > 	debug3: channel 0: read rfd 10 len 16384
> > > > 	debug3: channel 0: channel data: 15907
> > > > 	debug2: channel 0: rcvd adjust 16861
> > > > 	debug3: channel 0: channel data: 477
> > > > 	debug3: channel 0: read rfd 10 len 16384
> > > > 	debug3: channel 0: channel data: 16384
> > > > 	debug2: channel 0: rcvd adjust 65536
> > > > 	debug3: channel 0: read rfd 10 len 16384
> > > > 	debug3: channel 0: channel data: 16384
> > > > 	debug3: channel 0: read rfd 10 len 16384
> > > > 	debug3: channel 0: channel data: 16384
> > > > 	debug1: Received SIGCHLD.
> > > > ^^ shell dies
> > > > 	debug1: session_by_pid: pid 29873
> > > > 	debug1: session_exit_message: session 0 channel 0 pid 29873
> > > > 	debug1: session_exit_message: release channel 0
> > > > 	debug1: channel 0: write failed
> > > > 	debug1: channel 0: output open -> closed
> > > > 	debug1: channel 0: close_write
> > > > 	debug1: session_free: session 0 pid 29873
> > > > 	debug3: channel 0: read rfd 10 len 16384
> > > > ^^ more reads from the shell.
> > > > 
> > > > if you shutdown at the SIGCHLD, you can no longer read
> > > > at this point!
> > > > 
> > > > 	debug2: channel 0: read 84 from efd 12
> > > > 	debug3: channel 0: channel data: 16384
> > > > 	debug2: channel 0: rwin 16384 elen 84 euse 1
> > > > 	debug2: channel 0: sent ext data 84
> > > > 	debug1: channel 0: read<=0 rfd 10 len 0
> > > > 	debug1: channel 0: read failed
> > > > 	debug1: channel 0: input open -> drain
> > > > 	debug1: channel 0: close_read
> > > > 	debug1: channel 0: input: no drain shortcut
> > > > 	debug1: channel 0: ibuf empty
> > > > 	debug1: channel 0: input drain -> closed
> > > > 	debug1: channel 0: send eof

> Here is the debugging output, with my latest patch (which fixes the -N
> problem you pointed out today) and your debug patch applied to 2.9p1:

these are still not the traces i'm looking for.
you need to make sure that SSHD still does
reads after the SIGCLD:

	debug1: Received SIGCHLD.
	...
	debug3: channel 0: read rfd 10 len 16384