When add two unsigned long long fields to the tx_thread structure，then create some threads, run some time, The system（cortex-m4） will enter a hardware failure.

[alwdev2019]

Describe the bug hardware environment: cortex-m4 When add two unsigned long long fields to the tx_thread structure，then create some threads, run some time, The system（cortex-m4） will enter a hardware failure. A thread uses the function vsnprintf to format a variable of type double into a buffer。but this thread formats variables of other types, such as int, there is hardware failure in the system。

Please also mention any information which could help others to understand the problem you're facing:

• What target device are you using?: cortex-m4
• Which version of Azure RTOS?: 6.1.9
• What toolchain and environment? : gcc,cortex-m4
• What have you tried to diagnose or workaround this issue?
• the caller of the function hardfault_handler is _tx_thread_schedule.
• the procedure go to some abnormal address like 0xFFFFFFF1
• when i change the type of the fields to unsigned long ,the bug will disappear. registers infor

To Reproduce Steps to reproduce the behavior:

1. Build my project in IAR Workbench.
2. See error

Expected behavior A clear and concise description of what you expected to happen.

Impact What impact does this issue have on your progress (e.g., annoyance, showstopper)

Logs and console output If applicable, add console logs or other types of debug information like Wireshark capture as .zip file.

Additional context Add any other context about the problem here.

[xiuwencai]

Hi @alwdev2019, it seems the stack pointer was corrupted. Where are these unsigned long long fields added?

[TiejunMS]

Closing.