[torqueusers] PBS: X11 forwarding init failed from start_exec

Eva Hocks hocks at sdsc.edu
Mon Feb 24 14:53:48 MST 2014



Found a peculiar problem when using X11 forwarding via qsub:

all nodes work off a new install, some nodes after some run time show
the error "PBS: X11 forwarding init failed"  and pbs job start does not
set X11 forwarding (display variable is not set).

netstat does not show any of those ports allocated and a reboot of the
system does NOT solve it!


A working connection looks like:

$ qsub -I -X -l nodes=hpc-0-6
qsub: waiting for job 359.hpcdev-005.local to start
qsub: job 359.hpcdev-005.local ready

x11_create_display: Socket family 2 is supported
x11_create_display: Socket family 10 is supported
listening on fd 3
successful x11 init, returning display 50
entering port_forwarder

and the port 6050 is allocated
tcp        0      0 127.0.0.1:6010              0.0.0.0:*                   LISTEN
tcp        0      0 127.0.0.1:6050              0.0.0.0:*        LISTEN

A non working connection:

$ qsub -X -I -l nodes=tscc-1-61 -q condo
qsub: waiting for job 1177312.tscc-mgr.local to start
qsub: job 1177312.tscc-mgr.local ready


x11_create_display: Socket family 2 is supported
x11_create_display: Socket family 10 is supported
bind port 6050: Cannot assign requested address
x11_create_display: Socket family 2 is supported
x11_create_display: Socket family 10 is supported
bind port 6051: Cannot assign requested address
........
........
x11_create_display: Socket family 2 is supported
x11_create_display: Socket family 10 is supported
bind port 6498: Cannot assign requested address
x11_create_display: Socket family 2 is supported
x11_create_display: Socket family 10 is supported
bind port 6499: Cannot assign requested address
Failed to allocate internet-domain X11 display socket.
PBS: X11 forwarding init failed

and the port is not allocated on tose systems.
tcp        0      0 localhost.lo:x11-ssh-offset *:*                         LISTEN




Any hint?
Thanks
Eva






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