MySQL Bugs: #91805: Kernel segfault in mysql libssl

Bug #91805	Kernel segfault in mysql libssl
Submitted:	26 Jul 2018 15:27	Modified:	27 Jul 2018 4:44
Reporter:	Doug Pedrick	Email Updates:
Status:	Analyzing	Impact on me:	None
Category:	Connector / Python	Severity:	S1 (Critical)
Version:	8.0.11	OS:	Linux (AWS Linux)
Assigned to:	Assigned Account	CPU Architecture:	x86

Description:
Python 3.6.5, using a cherry py web server front end, and MySQL 5.7 backend.  With 8.0.11 after a few minutes of heavy load the process segfaults:

kernel: [154772.269554] python3[22456]: segfault at 1e8 ip 00007fcdd6887f47 sp 00007fcd8afbfd60 error 4 in libssl.so.1.0.0[7fcdd6860000+65000]

The interesting thing is that I am not using SSL to the database (nor HTTPS to the web server).  SSL should not be in play anywhere.

Revert to 2.1.16 and it works fine.

How to repeat:
The SQL being used is a very simple select.  Nothing odd, other than the cursor's connection, which is weakly referenced, apparently gets GC'd every so often, but that's a different issue.

If I restart the server after it dies, it'll handle a few dozen requests and then segfault again.

Suggested fix:
For now, reverting back to 2.1.16, although that is not officially supported on Python 3.6, but at least it does not segfault.

Thank you for the bug report.

Can you test using the latest version of Connector/Python (8.0.29)?
If the issue persists, can you provide some sample code so we can reproduce the problem?