MySQL Bugs: #109928: Test crashes on Mac M1 chip

Bug #109928	Test crashes on Mac M1 chip
Submitted:	3 Feb 21:35	Modified:	11 May 12:40
Reporter:	Justin Gossett	Email Updates:
Status:	Need Feedback	Impact on me:	None
Category:	Connector / ODBC	Severity:	S3 (Non-critical)
Version:	8.0.32	OS:	MacOS
Assigned to:	MySQL Verification Team	CPU Architecture:	ARM (M1 Chip)

Description:
Running the test t_bug34429 inside test module my_result1 using a Mac with an M1 chip will result in a crash.

The test t_bug34429 actually passes but then crashes after the test returns to the test framework.

I've observed that if you simply do not copy over the last byte during SQLGetData(), the crash goes away. The test will fail (because it's expecting that last byte) but the crash no longer happens. 
To verify this, edit driver/utility.cc line 621 and change it from `if (result && result == result_end)` to `if (result && result == result_end-1)`.
That -1 will cause the buffer copy to stop one byte sooner and the crash won't happen. Obviously this is not a solution but it's a clue for what's going on here.

How to repeat:
1. Edit test/my_result1.c and comment out lines 2257-2288 so that t_bug34429 is the only test that runs.
2. Run my_result1 and observe it crash.

Hello Justin,

Thank you for the bug report.
Could you please provide more information to reproduce this issue at our end?

Regards,
Ashwini Patil

Hello Ashwini,

Initially I saw this bug on a Mac M1 VM and it was reliably reproducible there. We just tried reproducing this bug on a different Mac M1 machine and we were unable to reproduce it. If you are also unable to reproduce the bug on a M1 machine, then I was probably mistaken thinking this was a M1 issue.

Regards,
Justin

Hello Justin,

Thank you for the details.
Could you please provide detailed steps to reproduce this issue at our end?

Regards,
Ashwini Patil