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The "undef" return value means that the command script_run timed out so it returned neither "0" for success nor a non-zero exit code for failure. But of course I agree that the call should not timeout as the ping itself looks completely fine. https://openqa.nue.suse.com/tests/6939481#step/esxi_open_vm_tools/57 shows that after the ping command the token "LHroM" should have been written to /dev/ttyS0 but https://openqa.nue.suse.com/tests/6939481/logfile?filename=serial0.txt does not show that token. So the token was never received and hence the command times out.

As this is running on "vmware" I assume it is an issue specific to that backend.

It would help us if you could fill the ticket according to the ticket template for defects https://progress.opensuse.org/projects/openqav3/wiki/#Defects . Could you please try that and especially fill the information about reproducibility.

I see. So the impact seems to be limited to the vmware backend. Good that you could reproduce it on another vmware host. Within the QE Tools team I doubt we won't be able to help more. You are on your own, sorry.

I've found a solution. After shutting down and booting up VM, it is required to re-setup the serial channel to the VM before switch to SUT console.

Just adding the following line in my test code.
console('svirt')->start_serial_grab;