Bug #51815 SQL Editor crashes on syntax checking: Sql_editor::check_sql()

Description:
Opened a text file that was opened in notepad, then saved as utf-8 text. The conversion was because original file would not even open in sql editor - got an error that the file encoding was Latin1 and could not be opened.
Workbench showed an error near the first line of comments marked with -- . I clicked on the first position and hit enter once to add code, and the error occured.

I am new to MySQL but I think, from what I have read, I may be able to run this script from the command prompt, once I figure the syntax out. I am submitting this report because the error dialog requested it. I have run Memtest86+ and it reports no memory errors.

From MySQL Workbench Unexpected Error dialog....

Exception = System.AccessViolationException
Message = Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
FullText = System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
   at Sql_editor.check_sql(Sql_editor* , shared_ptr<Sql_editor>* , Boolean )
   at MySQL.Grt.Db.Sql.Sql_editor.check_sql()
   at MySQL.Grt.Db.Sql.SqlEditor.CheckSyntax()
   at MySQL.Grt.Db.Sql.SqlEditor.BackgroundActionTimer(Object obj, EventArgs args)
   at System.Windows.Forms.Timer.OnTick(EventArgs e)
   at System.Windows.Forms.Timer.TimerNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

How to repeat:
Opened a text file that was opened in notepad, then saved as utf-8 text. The conversion was because original file would not even open in sql editor - got an error that the file encoding was Latin1 and could not be opened.
Workbench showed an error near the first line of comments marked with -- . I clicked on the first position and hit enter once to add code, and the error occured.

After closing the reported error dialog, I typed in use test on the first line of the sql window and got another error message show in the jpg screen snip added in the files section.

2nd error dialog

Attachment: addedUseTest db then this error.JPG (image/pjpeg, text), 69.50 KiB.

As this happens after first linebreak my guess is that WB expects Unix linebreaks (\n) and the file created by Notepad has Windows linebreaks (\r\n). I think there is a similar or maybe even identical report already.

Also a utf8-file saved by Notepad has BOM's (Byte Order marks) what I do not know if WB handles properly.

Peter
(not a MySQL person)

Besides WB should handle ANSI-encoded files smoothly (if it does not).  Most .sql/.txt files generated by (Microsoft or non-Microsoft) Windows programs will be ANSI encoded.

Bug #51308 does deal with the issue of line endings, if that is the cause of the error messages described here, as Peter Laursen suggests.

I have strong reasons to blame a threading issue related to missing mutex quarder. Fix for that was pushed to repository.
Let me know if this bug reoccur in next version.

fix confirmed in repository

An entry has been added to the 5.2.17 changelog:

MySQL Workbench crashed while attempting to edit code in the SQL Editor.

I have at least one crash a day where the SQL parser looses it. Good fix would be the ability to turn the parser off and avoid the libwpublic.be.dylib Sql_edit::check_sql crashes.