LTP python-runner tests in Publiccloud return SUTError

[m-dati]

A progress.opensuse.org issues has been created, check poo# 119812.

After prepared the LTP test python runner as in poo#116668, the scheduled runltp-python tests in public cloud-Development group 447 started, but some tests initially failed all for the same issue and were restarted 3 times before to pass, so 2 tests failed and last one passed, in 2 different builds.

In particular the first runs of kernel-ec2: syscalls: https://openqa.suse.de/tests/9856819#step/run_ltp/50 cve: https://openqa.suse.de/tests/9856226#step/run_ltp/50 failed both with the same error:

# wait_serial expected: qr/wKYTI-\d+-/u
# Result:

Host information

    System: Linux
    Node: install
    Kernel Release: 5.3.18-150300.59.98-default
    Kernel Version: #1 SMP Thu Oct 13 08:52:00 UTC 2022 (dfcde7e)
    Machine Architecture: x86_64
    Processor: x86_64

    Temporary directory: /tmp/runltp.root/tmpkhgmmrz6

Connecting to SUT: ssh
Error: Can't read return code from reply '\n'

Traceback (most recent call last):
  File "runltp-ng/ltp/session.py", line 278, in run_single
    sut_config)
  File "runltp-ng/ltp/session.py", line 172, in _start_sut
    iobuffer=Printer(sut, False))
  File "runltp-ng/ltp/ssh.py", line 309, in communicate
    iobuffer=iobuffer)
  File "runltp-ng/ltp/ssh.py", line 465, in run_command
    f"Can't read return code from reply {repr(reply)}")
ltp.sut.SUTError: Can't read return code from reply '\n'

wKYTI-1-

That same error was already noted in the past and initially, it was resolved with a patch in the ssh module, adding a sleep time, but it re-occurred now and is not deterministic, test reruns sometime pass: probably related to some sync timing.

Please check more details in the above named poo# 119812.

[m-dati]

For investigation purpose, here is a new Failed test in Build:26669:kernel-ec2

[acerv]

Merged ssh branch inside master with bugfix for this issue.