MySQL Bugs: #25203: Mysql crashes when mysql_kill() is executed in a connection using SSL

Bug #25203	Mysql crashes when mysql_kill() is executed in a connection using SSL
Submitted:	20 Dec 2006 8:43	Modified:	15 Feb 2007 4:30
Reporter:	Bikas Suman	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server	Severity:	S2 (Serious)
Version:	5.14, 5.0.	OS:	Windows (Windows Xp/Linux)
Assigned to:	Magnus Blåudd	CPU Architecture:	Any
Tags:	crash, mysql_kill(), SSL

Description:
I was devloping the software where i was suppose to implement the stop query execution in a SSL connection mode.

For this i decided to make use of mysql_kill(), and it was working fine in normal connection , where i use to kill the thread associated with that query.

While implementing the same using a SSL connection i found that everytime the program executed the mysql_kill() , the server crashes .....

I think u should definately look into this.

How to repeat:
Start a mysql server ( I tested on 5.0.24a-community-nt-log, 5.1.14-beta-community ) with 
" mysqld --ssl-ca=cacert.pem --ssl-cert=server-cert.pem --ssl-key=server-key.pem "
as the starting command.

Then use any program to call mysql_kill(),

Windows Xp returns a crash report with the "send or don't send" options and the mysqld crashes.

Thank you for the bug report. Could you please provide the C code client
test case. Thanks in advance.

I have added the file in zip mode to /pub/mysql/upload.
If u cannot find it plz tell me , i am new to it and not sure if i have done it correctly,

The source is a simple c++ code written on .net platform,
I think it will clear my point.

If u need more info . please feel free to ask
I would be happy to contibute in ur proj.

Thx you
bikas,

Thank you for the feedback. Which is the zip filename? and it is small
you can attach it here using the files tab and private if you want.
Thanks in advance.

Sorry about that , its named  "SSl Sample.zip" in the "upload" folder.
It is a .net project so its kind of big. and the comment on the web site said if it is more then 200 kb , upload it in "upload" folder 

I have also attached only the code part here , u can have a look at that.
hope this time i am doing everything right :-)

thx,
bikas

mysql_kill() crash in ssl connection

Attachment: ssl.cpp (text/plain), 1.18 KiB.

Call stack for Windows and Linux

Attachment: backtrace-25203.txt (text/plain), 4.72 KiB.

Thank you for the bug report. I was able to crash the Windows and Linux
servers with your application (call stack attached for both). However
you need to use the multi-threaded client approach for that kind of
application, anyway the server should not crash disregarding the client
application.

Thx for ur quick response , 

Obviously we are using multi threaded approach for our application 

The prog that i send you is just for demo for the crash and was happy that you could find the crash easily. 

hoping for quick fix ,

bye
Bikas ,

Can reproduce

Related to bug#19209

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/18837

ChangeSet@1.2392, 2007-01-26 11:30:54+01:00, msvensson@shellback.(none) +3 -0
  Bug#25203 Mysql crashes when mysql_kill() is executed in a connection using SSL
   - It's too early to free the SSL object in 'vio_ssl_close'. There
     might still be a thread using or reading from it on platforms
     where we need to close the active connection/socket in order
     to break the read.  
   - Add new function 'vio_ssl_delete' and install it as the viodelete
     function for SSL connections.

Available in 5.0.36 and 5.1.16-beta.

Noted in 5.0.36, 5.1.16 changelogs.

mysql_kill() caused a server crash when used on an SSL connection.