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Bug #17193 calling getenv after register_shutdown causes apache to crash
Submitted: 2002-05-13 19:25 UTC Modified: 2002-07-11 10:19 UTC
Votes:1
Avg. Score:3.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: jtate@php.net Assigned:
Status: Closed Package: Scripting Engine problem
PHP Version: 4.1.2/PHP_4_2_0 OS: RH Linux 7.2/Apach 1.3.22
Private report: No CVE-ID: None
View Developer Edit
 [2002-05-13 19:25 UTC] jtate@php.net 
If you call register_shutdown_function, and then in the registered function make a call to getenv, Apache segfaults.  

Here's a sample script:

<?PHP
function shutdowner()
{
    $out = fopen("/tmp/env.out", "at");
    fwrite($out, "getenv returned " . getenv("HOME") . "\n");
    fclose($out);
}

echo "Getenv returned " . getenv("HOME") . "\n";
register_shutdown_function("shutdowner");

?>

Please note.  This only happens when running as an apache module.  CLI works fine, and I'd assume that CGI does too.

I'll post a back trace if some kind soul will explain how to do it under RH linux using the messed up !apachectl method that they use to start apache.

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 [2002-05-14 01:19 UTC] derick@php.net 
Thank you for this bug report. To properly diagnose the problem, we
need a backtrace to see what is happening behind the scenes. To
find out how to generate a backtrace, please read
http://bugs.php.net/bugs-generating-backtrace.php

Once you have generated a backtrace, please submit it to this bug
report and change the status back to "Open". Thank you for helping
us make PHP better.

You can find ho wto make a backtrace on the location mentioned above.

Derick
 [2002-05-14 16:26 UTC] jtate@php.net 
Here's the back trace.  Still happens with current 4_2_0 CVS.  I'm checking HEAD right now.

(gdb) bt
#0  0x00000000 in ?? ()
#1  0x403d03d6 in apache_php_module_shutdown_wrapper () at mod_php4.c:795
#2  0x08051148 in run_cleanups (c=0x8107e04) at alloc.c:1713
#3  0x0804f681 in ap_clear_pool (a=0x80903d4) at alloc.c:538
#4  0x08062f70 in standalone_main (argc=1, argv=0xbfffea94) at http_main.c:5030
#5  0x08063b24 in main (argc=1, argv=0xbfffea94) at http_main.c:5417
#6  0x401af647 in __libc_start_main (main=0x8063640 <main>, argc=1,
    ubp_av=0xbfffea94, init=0x804e3f0 <_init>, fini=0x807c770 <_fini>,
    rtld_fini=0x4000dcd4 <_dl_fini>, stack_end=0xbfffea8c)
    at ../sysdeps/generic/libc-start.c:129

It looks like register_shutdown_function is no longer performing as it has in the past.  I'll follow up this in another bug report.
 [2002-05-14 16:37 UTC] jtate@php.net 
Doesn't seem to happen with HEAD.
 [2002-07-11 02:59 UTC] sniper@php.net 
If it doesn't happen with HEAD..why is this report still open? :)
 [2002-07-11 10:19 UTC] jtate@php.net 
As long as there isn't another 4.2 release we're fine.  Otherwise, there's still an open bug.
 
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