MySQL Bugs: #84470: mysql_stmt_close hangs when the statement is canceled with KILL QUERY

Bug #84470	mysql_stmt_close hangs when the statement is canceled with KILL QUERY
Submitted:	11 Jan 2017 11:20	Modified:	24 Sep 2022 6:26
Reporter:	Sebastien FLAESCH	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server: C API (client library)	Severity:	S1 (Critical)
Version:	8.0.19	OS:	Debian (11)
Assigned to:		CPU Architecture:	Any
Tags:	KILL QUERY mysql_stmt_prepare mysql_stmt_close hangs

File:	Maximum allowed size is 50MB.
Description:
Privacy:

If the data you need to attach is more than 50MB, you should create a compressed archive of the data, split it to 50MB chunks, and upload each of them as a separate attachment.

To split a large file:

On *nix platforms use the split command e.g. split -b 50MB <my_large_archive> <my_split_archive_prefix>
On windows use WinZip or a similar utility to split the large file

C sample to reproduce the problem

Attachment: kill_prepared_query.c (text/x-csrc), 3.47 KiB.

Second C sample, using mysql_query() instead of prepared statements (works)

Attachment: kill_query.c (text/x-csrc), 2.71 KiB.