After upgrading to 1.600 I am getting build errors on all jobs that has a "Execute shell" build step

I tried downgrading to 1.599 and everything works there.
I tried with both sh and bash
It looks like the shell commands are terminated randomly in the middle of the run

I tested with a very simple script like :

sleep 59
echo "sleep done"

and got :

Started by timer
[EnvInject] - Loading node environment variables.
Building remotely on cis01.coolsmsc.dk (swarm) in workspace /home/jenkinsslave/workspace/cron - test - test-no-php
[cron - test - test-no-php] $ /bin/bash -xe /tmp/hudson4904788725429931154.sh
+ sleep 59
/tmp/hudson4904788725429931154.sh: line 2: 19627 Terminated sleep 59
Build step 'Execute shell' marked build as failure
Finished: FAILURE