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Bug #59670 chdb crashes when throwing exception on 64-bit platform
Submitted: 2011-03-16 05:37 UTC Modified: 2011-03-19 10:49 UTC
From: php at sagi dot org Assigned:
Status: Closed Package: chdb (PECL)
PHP Version: 5.3.5 OS: Linux 64-bit
Private report: No CVE-ID: None
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 [2011-03-16 05:37 UTC] php at sagi dot org
When I run a script such as:
try {
        $chdb = new chdb('/path/to/non-existing-file');
} catch (Exception $ex) {
        echo "Caught exception: ", $ex;

As a web page (running under Apache httpd) on PHP 5.3.5 64-
bit, the Apache process crashes with the following back-
Program received signal SIGSEGV, Segmentation fault.
0x00002aaab18e3b63 in instanceof_function_ex () from 
(gdb) bt
#0  0x00002aaab18e3b63 in instanceof_function_ex () from 
#1  0x00002aaab18e3b3b in instanceof_function () from 
#2  0x00002aaab1903a19 in zend_throw_exception () from 
#3  0x00002aaab1903bb7 in zend_throw_exception_ex () from 
#4  0x00002aaab6d383a5 in throw_except_errno 
(format=0x2aaab6d38886 "Cannot load '%s': %s",
"/srv/MyHeritage/cache/translations.chdb", _errno=2) at 
#5  0x00002aaab6d38476 in zim_chdb___construct (ht=1, 
return_value=0x2aaab3169738, return_value_ptr=<value 
optimized out>,
    this_ptr=<value optimized out>, return_value_used=<value 
optimized out>) at /home/sagi/rpmbuild/BUILD/chdb-
#6  0x00002aaab193a099 in ?? () from 
#7  0x00002aaab191031b in execute () from 
#8  0x00002aaab18ec3e5 in zend_execute_scripts () from 
#9  0x00002aaab189cee8 in php_execute_script () from 
#10 0x00002aaab19750cd in ?? () from 
#11 0x00002aaaaaad4a4a in ap_run_handler ()
#12 0x00002aaaaaad7ed8 in ap_invoke_handler ()
#13 0x00002aaaaaae2938 in ap_process_request ()
#14 0x00002aaaaaadfb70 in ?? ()
#15 0x00002aaaaaadbcd2 in ap_run_process_connection ()
#16 0x00002aaaaaae6789 in ?? ()
#17 0x00002aaaaaae6989 in ?? ()
#18 0x00002aaaaaae74a7 in ap_mpm_run ()
#19 0x00002aaaaaac1e48 in main ()

This doesn't happen when I run it as a CLI script and it 
also never happens on 32-bit platform (both CLI and httpd).

I am using chdb 0.2.0 but I understand it is identical to 


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 [2011-03-16 09:38 UTC] lorenzo at hyves dot nl
I don't currently have a setup like yours to test on, but the 
stacktrace seems to point to 'default_exception_ce' not being 
correctly initialized in Zend/zend_exceptions.c.

What happens if you replace the chdb line with something like 
'new SimpleXmlElement("-")'?
 [2011-03-16 09:46 UTC] php at sagi dot org
I already tried to test other extensions that throw exceptions 
in their constructor including datetime and simplexmlelement - 
neither of them crashes, I could only experience this with 
 [2011-03-17 04:25 UTC] php at sagi dot org
Just wanted to update that I managed to reproduce the problem on another 
server with identical setup, and also on a virtual server on Amazon EC2 
that I installed from scratch especially for the purpose of debugging this 

Is there anything else I can do to help? If you need access to a 64-bit 
server I will gladly provide access credentials to the EC2 server.
 [2011-03-19 10:49 UTC] lorenzo at hyves dot nl
Thank you for your bug report. This issue has been fixed
in the latest released version of the package, which you can download at

I've reproduced the bug and it should be fixed in the new 
release 1.0.1. Thanks for the report!
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