sshd crash

[Ian Lepore]

On Sat, 2013-11-02 at 02:40 +0800, Jia-Shiun Li wrote:
> On Sat, Nov 2, 2013 at 1:53 AM, Ian Lepore <ian at freebsd.org> wrote:
> > On Sat, 2013-11-02 at 01:44 +0800, Jia-Shiun Li wrote:
> >> may I add: putty causes this to happen. mine 0.62. But ssh from another
> >> FreeBSD host has no problem.
> >>
> >> I suspect it to be some issues related to memory or malloc issues
> >> specific to bbb. 'tmux a -d' without existing detached sessions
> >> causes tmux client to core dump. But sshd and it are both fine on rpi.
> >>
> >> -Jia-Shiun.
> >
> > This is the first I've heard of being able to ssh to an arm platform
> > that doesn't have PrivSep disabled, since about July or so.  I've never
> > heard a report yet that anything on the client side could make a
> > difference.
> >
> > It's definitely not a beaglebone thing, it happens on every arm board
> > I've got... dreamplug, rpi, bbw, imx53, wandboard.
> 
> 
> Ok let me make sure I did not mix things up. ;)
> 
> IIRC  I once saw similar issue on rpi shortly. But after another
> weekly update it was gone. I did not pay too much attention on rpi,
> and thought it was bbb specific.
> 
> I did not change sshd_config, UsePrivilegeSeparation supposed
> remaining on as default is.
> 
> sshd logs attached initiating ssh to bbb from:
>  - PuTTY on Windows w/ key auth,
>  - PuTTY on Windows w/ password auth, and
>  - (open)ssh on rpi
> 
> Both rpi & bbb are now running r257094:
> --- 8< ---
> jsli at beaglebone:~ % uname -a
> FreeBSD beaglebone 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r257094: Sat
> Oct 26 03:06:24 CST 2013
> jsli at 4cbsd:/root/crochet-freebsd/work/obj/arm.armv6/usr/src/sys/BEAGLEBONE
>  arm
> jsli at beaglebone:~ %
> 
> jsli at raspberry-pi:~ % uname -a
> FreeBSD raspberry-pi 11.0-CURRENT FreeBSD 11.0-CURRENT #2 r257094: Sat
> Oct 26 00:16:37 CST 2013
> jsli at 4cbsd:/rpi/obj/arm.armv6/usr/src/sys/RPI-B  arm
> jsli at raspberry-pi:~ %
> --- 8< ---
> 
> -Jia-Shiun.

Okay, I can confirm that the client you use makes a difference in some
way.  With privsep enabled on my BBW I get the jemalloc assert on the
server when connecting from an older client, including both of these:

x86 - OpenSSH_5.4p1 FreeBSD-20100308, OpenSSL 0.9.8q 2 Dec 2010
arm - OpenSSH_5.4p1_hpn13v11 FreeBSD-20100308, OpenSSL 0.9.8q 2 Dec 2010

The x86 system is running 8.3 and the arm system 8.2.

When using my rpi to connect to the bb, it works.  Its version is:

OpenSSH_6.3p1, OpenSSL 1.0.1e-freebsd 11 Feb 2013

I have no idea what all this means, but it is the first new datapoint
we've had for a while.

-- Ian