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Hit a new issue with swtpm device attached, if we define snapshot there, the rollback operation will try to kill the current qemu process and then start the VM again with snapshot.

however, the socket file will lost in this case [can reproduce with manual steps]

Let me try to enhance my test code to remove the rollback operation.

[2022-02-09T15:53:56.706039+01:00] [info] ::: consoles::serial_screen::read_until: Matched output from SUT in 2 loops & 0.000853997014928609 seconds: echo JLYr0; bash -oe pipefail /tmp/scriptJLYr0.sh ; echo SCRIPT_FINISHEDJLYr0-$?-
[2022-02-09T15:53:56.707002+01:00] [debug] >>> testapi::wait_serial: echo JLYr0; bash -oe pipefail /tmp/scriptJLYr0.sh ; echo SCRIPT_FINISHEDJLYr0-$?-: ok
[2022-02-09T15:53:56.707308+01:00] [debug] tests/security/tpm2/tpm2_engine/tpm2_engine_info.pm:25 called testapi::validate_script_output
[2022-02-09T15:53:56.707639+01:00] [debug] <<< testapi::wait_serial(timeout=30, record_output=1, no_regex=0, buffer_size=undef, regexp="SCRIPT_FINISHEDJLYr0-\\d+-", quiet=undef, expect_not_found=0)
[2022-02-09T15:53:56.708907+01:00] [debug] <<< consoles::serial_screen::read_until(quiet=undef, expect_not_found=0, buffer_size=undef, regexp="SCRIPT_FINISHEDJLYr0-\\d+-", no_regex=0, record_output=1, cmd="backend_wait_serial", pattern="SCRIPT_FINISHEDJLYr0-\\d+-", timeout=30, json_cmd_token="fZUNWCvl")
[2022-02-09T15:53:56.784924+01:00] [info] ::: consoles::serial_screen::read_until: Matched output from SUT in 5 loops & 0.0762789860018529 seconds: SCRIPT_FINISHEDJLYr0-0-
[2022-02-09T15:53:56.786195+01:00] [debug] >>> testapi::wait_serial: SCRIPT_FINISHEDJLYr0-\d+-: ok
[2022-02-09T15:53:56.792329+01:00] [debug] ||| finished tpm2_engine_info security/tpm2/tpm2_engine (runtime: 0 s)
[2022-02-09T15:53:56.794722+01:00] [debug] Loading a VM snapshot lastgood
[2022-02-09T15:53:56.797029+01:00] [debug] Loading snapshot (Current VM state is running)
[2022-02-09T15:53:56.821459+01:00] [debug] EVENT {"event":"STOP","timestamp":{"microseconds":820989,"seconds":1644418436}}
[2022-02-09T15:53:56.824796+01:00] [info] ::: OpenQA::Qemu::Proc::save_state: Saving QEMU state to qemu_state.json
[2022-02-09T15:53:57.861553+01:00] [debug] QEMU: qemu-system-x86_64: terminating on signal 15 from pid 27271 (/usr/bin/isotovideo: backen)

Error messages:

[2022-02-11T09:53:12.716274+01:00] [debug] The built-in video encoder (pid 21670) terminated
[2022-02-11T09:53:12.716726+01:00] [debug] QEMU: QEMU emulator version 5.2.0 (SUSE Linux Enterprise 15)
[2022-02-11T09:53:12.716893+01:00] [debug] QEMU: Copyright (c) 2003-2020 Fabrice Bellard and the QEMU Project developers
[2022-02-11T09:53:12.717111+01:00] [warn] !!! : qemu-system-x86_64: -chardev socket,id=chrtpm,path=/tmp/mytpm1/swtpm-sock: Failed to connect to '/tmp/mytpm1/swtpm-sock': No such file or directory
[2022-02-11T09:53:12.717600+01:00] [debug] sending magic and exit
[2022-02-11T09:53:12.718430+01:00] [debug] received magic close
Use of uninitialized value $fname in concatenation (.) or string at /usr/lib/os-autoinst/log.pm line 66.
    log::fctwarn("THERE IS NOTHING TO READ 16 5 4") called at /usr/bin/isotovideo line 359
[2022-02-11T09:53:12.720561+01:00] [warn] !!! : THERE IS NOTHING TO READ 16 5 4
[2022-02-11T09:53:12.721023+01:00] [debug] stopping command server 21513 because test execution end

https://openqa.suse.de/tests/8168760#
Regress tests on sle passed