2 messages in com.mysql.lists.bugsRe: Procedure for Debugging?| From | Sent On | Attachments |
|---|---|---|
| Matthew Boehm | 29 Mar 2005 07:45 | |
| Matthew Boehm | 31 Mar 2005 12:08 |
| Subject: | Re: Procedure for Debugging? |
|---|---|
| From: | Matthew Boehm (mbo...@cytelcom.com) |
| Date: | 03/31/2005 12:08:04 PM |
| List: | com.mysql.lists.bugs |
Ben Johnson wrote:
looks like the app died during a mysql_reconnect(). maybe it does this during every ping, but I doubt it. I think the reason the problem is intermittent is that it only happens after your app has lost its connection to the database.
I've got two things here. First, I didn't realize mysql_reconnect was a real function in the mysql library. I had written my own function for my module called mysql_reconnect. Shouldn't this have cause some kind of compiler warning?
Secondly, yes, this crash is happening after a loss of connection to the database. I started my app yesterday morning, didn't do anything with it and this morning I tried to check the status of its connection to mysql and it segfaulted again.
What's causing it isn't entirely clear, but it should be fairly easy to track down. my_strcasecomp_8bit() is being passed a pointer
Here is the code segment from get_charset_number which calls my_strcasecmp, which then calls my_strcasecomp_8bit:
444 if ( cs[0] && cs[0]->csname && (cs[0]->state & cs_flags) && 445 !my_strcasecmp(&my_charset_latin1, cs[0]->csname, charset_name))
my_strcasecmp is just an alias:
include/m_ctype.h:#define my_strcasecmp(s, a, b) ((s)->coll->strcasecmp((s), (a), (b)))
Somehow, "cs[0]->csname" has a value of 1, which is bad.
Seeing as how my module only calls mysql_ping, I don't see how this segfault is being cause by my app. Any ideas?
oh... btw, you just showed everyone your password, so you better change
it.
I had changed it and the IP before I posted, so everyone saw a fake one. ;)
Thanks, Matthew