Sanitycheck corrupted test case names in test-report.xml files

[maksimmasalski]

Describe the bug
Sometimes during the Sanitycheck I receive test results .xml files with the corrupted test case names. Inside of .xml file among test cases with proper names, can be detected names like that one below.
sys.mutex.nouser.thread_06@119. Failed to take mutex 0x20002288

To Reproduce

1. It was a sanitycheck run for the board qemu_cortex_m3 during the master build master-2019-11-10-53f30bc3ac
2. I was not able to reproduce that bug again using the same commit 53f30bc
   and running the sanitycheck for that test case and the board using $sanitycheck -p qemu_cortex_m3 -T /home/maksim/zephyrproject/zephyr/tests/kernel/mutex/sys_mutex/
   That bug is difficult to catch.
3. Original output test-report.xml file with that error

=========================XML ERROR1 PART START=============================

<testcase classname="qemu_cortex_m3:sys.mutex.nouser" name="sys.mutex.nouser.thread_06@119. Failed to take mutex 0x20002288" time="8.243418"><failure message="failed" type="failure">***** Booting Zephyr OS build zephyr-v2.0.0-1958-g53f30bc3ac24 *****
Running test suite mutex_complex
===================================================================
starting test - test_mutex
starting test - Test kernel Mutex API
===================================================================
Done LOCKING!  Current priority = 5

    Assertion failed at ZEPHYR_BASE/tests/kernel/mutex/sys_mutex/src/main.c:306: test_mutex: (rv not equal to 6)
thread_05 timed out and out priority should drop.

FAIL - test_mutex
===================================================================
starting test - test_user_access
SKIP - test_user_access
===================================================================
starting test - test_supervisor_access
PASS - test_supervisor_access
===================================================================
Test suite mutex_complex failed.
===================================================================
PROJECT EXECUTION FAILED
FAIL - thread_06@119. Failed to take mutex 0x20002288
</failure></testcase>

=========================XML ERROR1 PART END=============================

Additional comments

1. Recently on November 29th the same error happened with the net.trickle for board mimxrt1050_evk.
   net.trickle.Trickle 1 0x80000c88 callback called
   The most recent commit with that error was 42c5b0a
   https://zephyrproject.testrail.io/index.php?/tests/view/14520629&group_by=cases:title&group_order=asc&group_id=-1
   I can't reproduce for that commit that error too using $sanitycheck -p mimxrt1050_evk -T /home/maksim/zephyrproject/zephyr/tests/net
   When I ran sanitycheck, that test passed successfully.

You can try to find more corrupted test case names in the TestRail for the Zephyr RTOS
https://zephyrproject.testrail.io

Expected behavior
In normal conditions I expect even if test case fails to pass, error message in the Sanitycheck can't destroy test case name string in the test-report.xml file. Many other test cases also fail to pass, but their test case names not corrupted with the error message.

Environment:

• OS: Fedora 28
• SDK Zephyr 0.10.3
• 53f30bc or 42c5b0a

[maksimmasalski]

Today I will run full sanitycheck cycle for that boards, to see if the error can be reproduced.

[nashif]

moving up to medium, this bug is causing sanitycheck to produce inconsistent test results when something fails.

[maksimmasalski]

moving up to medium, this bug is causing sanitycheck to produce inconsistent test results when something fails.

I'm in process of checking your fix #21191 , I need time to verify it, to understand if it will help on 100%.