Wind River Support Network

Description

When trying to login using ssh or scp with compression enabled, the connection is closed by the remote server and the following logs are found in /var/log/message: 

Aug 16 11:11:23 overwidth auth.info sshd[9834]: Accepted publickey for overwidth from 192.168.0.126 port 41038 ssh2 
Aug 16 11:11:23 overwidth auth.crit sshd[9836]: fatal: buffer_uncompress: inflate returned -3 
(when I use ssh or scp client in Linux with -C option to enable compression) 

Aug 16 11:26:05 overwidth auth.info sshd[9967]: Accepted publickey for overwidth from 192.168.0.110 port 49949 ssh2 
Aug 16 11:26:05 overwidth user.info kernel: sshd[9969]: segfault at 8d8bb0 ip 00000037baa07eeb sp 00007ffc0fa5e200 error 4 in libz.so.1.2.8[37baa00000+15000] 
(when I use putty and check the Enable compression option) 

Workaround

No workaround. Just stop using compression.

Steps to Reproduce

Configure a new WRL6 RCPL34 project with the following parameters and the attached custom template template.conf added into the /layers/local/templates/default/ directory:
$ /opt/data1/installs/WRL_60x_CGP_LATEST/wrlinux-6/wrlinux/configure --enable-board=intel-x86-64 --enable-kernel=standard --enable-rootfs=glibc_small --enable-parallel-pkgbuilds=32 --enable-jobs=32 --with-template=feature/initramfs-integrated --enable-sdkmachine=i686 --enable-reconfig=yes
$make
$make export-sdk
$make fs

Start Quemu to test on the local host and login with root/root:
$make start-target
root@qemu0:~# uname -a
Linux qemu0 3.10.62-ltsi-WR6.0.0.34_standard #4 SMP PREEMPT Fri Sep 22 10:58:22 CEST 2017 x86_64 x86_64 x86_64 GNU/Linux


On a different console on the same host, connect via SSH to the local host:
$ ssh -vvv -p 4440 root@localhost
It works. Now disconnect and reconnect again with compression enabled:
$ssh -vvv -C -p 4440 root@localhost 

We can observe in the verbose log that before the remote server closes the SSH connection, compression does get enabled
....debug1: Enabling compression at level 6.
but later the server closes the connection:
....debug1: Exit status -1
debug1: compress outgoing: raw data 91, compressed 84, factor 0.92
debug1: compress incoming: raw data 0, compressed 0, factor 0.00

Here is a tail of /var/log/messages on my Quemu instance:
Oct  9 14:42:50 qemu0 authpriv.notice sshd[287]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=10.0.2.2  user=root
Oct  9 14:43:05 qemu0 auth.info sshd[287]: Accepted password for root from 10.0.2.2 port 54739 ssh2
Oct  9 14:43:05 qemu0 authpriv.info sshd[287]: pam_unix(sshd:session): session opened for user root by (uid=0)
Oct  9 14:43:05 qemu0 auth.crit sshd[287]: fatal: buffer_uncompress: inflate returned -2
Oct  9 14:43:05 qemu0 authpriv.info sshd[287]: pam_unix(sshd:session): session closed for user root

Other Downloads

• Wind River Linux 6.0.0.36
• Wind River Linux 6.0.0.37
• Wind River Linux 6.0.0.38