samples: drivers: mbox: samples/drivers/mbox/sample.drivers.mbox.real_hw fails at nrf5340

[nordic-piks]

Describe the bug
The samples/drivers/mbox/sample.drivers.mbox.real_hw

Observed for

• nrf5340dk/nrf5340/cpuapp

To Reproduce
Steps to reproduce the behavior:

1. have nrf5340dk/nrf5340/cpuapp connected
2. go to your zephyr dir
3. call ./scripts/twister -T samples/drivers/mbox -p nrf5340dk/nrf5340/cpuapp --device-testing --device-serial /dev/ttyACM0 -v --inline-logs
4. See console output with error

Expected behavior
Valid console output

Impact
Not clear

Logs and console output

[2024-05-13T17:47:11.912Z] *** Booting Zephyr OS build v3.6.0-3768-g961959fc5f2b ***
[2024-05-13T17:47:11.912Z] Hello from APP
[2024-05-13T17:47:11.912Z] Pong (on channel 0)
[2024-05-13T17:47:11.912Z] Ping (on channel 1)
[2024-05-13T17:47:11.912Z] Pong (on channel 0)
[2024-05-13T17:47:11.912Z] Ping (on channel 1)
[2024-05-13T17:47:11.912Z] Ping (on channel 1)
[2024-05-13T17:47:11.912Z] Pong (on channel 0)
[2024-05-13T17:47:11.912Z] Ping (on channel 1)
[2024-05-13T17:47:11.912Z] Pong (on channel 0)
[2024-05-13T17:47:11.912Z] Ping (on channel 1)
[2024-05-13T17:47:11.912Z] Ping (on channel 1)
[2024-05-13T17:47:11.912Z] Pong (on channel 0)
[2024-05-13T17:47:11.912Z] Ping (on channel 1)
[2024-05-13T17:47:11.912Z] Pong (on channel 0)

But there is expected (from sample.yaml):

        - "Ping \\(on channel 0\\)"
        - "Pong \\(on channel 0\\)"
        - "Ping \\(on channel 1\\)"
        - "Pong \\(on channel 1\\)"

So there is missing ping on channel 0 and pong on channel 1

Environment (please complete the following information):

• OS: Ubuntu 20.04.1 LTS
• Toolchain Zephyr SDK 0.16.5
• Commit SHA or Version used: v3.6.0-3768-g961959fc5f2b