Description:
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Using mysql_pconnect appears to stop SHOW SLAVE STATUS queries working properly. If I change the first line in the supplied snippet to mysql_connect, it works fine.

Additionally, this bug doesn't appear to show up when using the script called from commandline.
But it does, reproducibly, when executing it inside a FastCGI daemon.

Even if I explicitly provide the connection object as a reference to mysql_query, the same behaviour is still observed.

Reproduce code:
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mysql_pconnect('some_host', 'some_user', 'some_pass');
$R = mysql_query("SHOW SLAVE STATUS");

print_r(mysql_fetch_assoc($R));

print mysql_result($R, 0, 'Seconds_Behind_Master');

Expected result:
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The appropriate result set I asked for would be just peachy :)

Actual result:
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If I use mysql_result:
PHP Warning:  mysql_result(): Unable to jump to row 0 on MySQL result index 4 in foo.php on line 4

Or mysql_fetch_assoc:
PHP Warning:  mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource in foo.php on line 3