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From Brandon Fosdick <b...@bfoz.net>
Subject Re: DBD/MySQL crash
Date Fri, 29 Dec 2006 05:58:54 GMT
Nick Kew wrote:
> That 0x0 looks like dbname.  What happens if you pass
> it a dbname in the params string?

Sharp eyes, but no joy. The mysql docs say mysql_real_connect() is safe to call with db==NULL.
But just in case, I checked it...
---
Program received signal SIGSEGV, Segmentation fault.
0x2811c9fe in my_stat (
    path=0xbfbfd1b0 "/usr/local/share/mysql/charsets/Index.xml", 
    stat_area=0xbfbfd110, my_flags=0) at my_lib.c:650
650       my_errno= errno;
(gdb) bt
#0  0x2811c9fe in my_stat (
    path=0xbfbfd1b0 "/usr/local/share/mysql/charsets/Index.xml", 
    stat_area=0xbfbfd110, my_flags=0) at my_lib.c:650
#1  0x28113868 in my_read_charset_file (
    filename=0xbfbfd1b0 "/usr/local/share/mysql/charsets/Index.xml", myflags=0)
    at charset.c:318
#2  0x28113c6c in init_available_charsets (myflags=0) at charset.c:422
#3  0x28114149 in get_charset_by_csname (cs_name=0x8186180 "latin1", 
    cs_flags=2, flags=16) at charset.c:558
#4  0x281283ee in mysql_init_character_set (mysql=0x8136800) at client.c:1704
#5  0x28129c8c in mysql_real_connect (mysql=0x8136800, 
    host=0x814e190 "bfoz.net", user=0x814e1a0 "logger", passwd=0x28135e38 "", 
    db=0x814e1a8 "httpd_log", port=3306, unix_socket=0x0, client_flag=0)
    at client.c:2093
#6  0x280ed86c in dbd_mysql_open (pool=0x80b9018, 
    params=0x80eb64c "host=bfoz.net,user=logger,dbname=httpd_log")
    at /usr/tmp/usr/ports/www/apache22/work/httpd-2.2.3/srclib/apr-util/dbd/apr_dbd_mysql.c:728
#7  0x280ebc3c in apr_dbd_open (driver=0x280ef800, pool=0x80b9018, 
    params=0x80eb64c "host=bfoz.net,user=logger,dbname=httpd_log", 
    handle=0x8175b9c)
    at /usr/tmp/usr/ports/www/apache22/work/httpd-2.2.3/srclib/apr-util/dbd/apr_dbd.c:163
<snip>
---

On the plus side, you led me to find a bug that was preventing dbname from being passed in
the param string. :)

> Do you have anything else that links to MySQL in your apache?

Not that I know of. It's a default install with all the other dbd-related modules commented
out.

For kicks I tried running mysql under gdb with a breakpoint on my_stat() and saw the following
output. It seems that my_stat() has moved to a different line in my_lib.c. That seems odd
to me.
---
Breakpoint 2, my_stat (path=0xbfbfe420 "/etc/my.cnf", stat_area=0xbfbfe425, 
    my_flags=0) at my_lib.c:639
639       DBUG_ENTER("my_stat");
---

A few more breakpoints later and we get something more familiar...
---
Breakpoint 2, my_stat (
    path=0xbfbfd650 "/usr/local/share/mysql/charsets/Index.xml", 
    stat_area=0x0, my_flags=0) at my_lib.c:639
639       DBUG_ENTER("my_stat");
---

But for some reason it doesn't segfault this time.

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