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Bug #79932 PHP 8.0 beta1 crashes when used as apache module
Submitted: 2020-08-05 10:45 UTC Modified: 2020-08-06 13:06 UTC
From: buschmann at nidsa dot net Assigned:
Status: Open Package: JIT
PHP Version: 8.0.0beta1 OS: Windows Server 2019 64bit
Private report: No CVE-ID: None
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From: buschmann at nidsa dot net
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 [2020-08-05 10:45 UTC] buschmann at nidsa dot net
Description:
------------
For testing I recently switched from PHP 8.0 alpha3 to 8.0beta1 in an otherwise unchanged environment under Windows Server 64 bit.

When trying to show a page or prewarm any script, the following error is shown in Apache error log (the whole sequence of server start and crash):

[Wed Aug 05 11:20:57.000616 2020] [ssl:warn] [pid 2332:tid 588] AH01873: Init: Session Cache is not configured [hint: SSLSessionCache]
[Wed Aug 05 11:20:57.000616 2020] [mpm_winnt:notice] [pid 2332:tid 588] AH00455: Apache/2.4.43 (Win64) OpenSSL/1.1.1g PHP/8.0.0beta1 configured -- resuming normal operations
[Wed Aug 05 11:20:57.000616 2020] [mpm_winnt:notice] [pid 2332:tid 588] AH00456: Apache Lounge VS16 Server built: Apr 21 2020 16:23:13
[Wed Aug 05 11:20:57.000616 2020] [core:notice] [pid 2332:tid 588] AH00094: Command line: 'N:\\Apache\\Apache24\\bin\\httpd.exe -d N:/Apache/Apache24'
[Wed Aug 05 11:20:57.016614 2020] [mpm_winnt:notice] [pid 2332:tid 588] AH00418: Parent: Created child process 1312
[Wed Aug 05 11:20:57.344367 2020] [ssl:warn] [pid 1312:tid 512] AH01873: Init: Session Cache is not configured [hint: SSLSessionCache]
[Wed Aug 05 11:20:57.359992 2020] [mpm_winnt:notice] [pid 1312:tid 512] AH00354: Child: Starting 64 worker threads.
[Wed Aug 05 11:20:58.453743 2020] [mpm_winnt:notice] [pid 2332:tid 588] AH00428: Parent: child process 1312 exited with status 3221225477 -- Restarting.


This sequence is repeated multiple times, always exited with status 3221225477.

PHP is unusable, no further testing possible.

When switching back to 8.0 alpha3, everything works again as before.
Environment:
- Windows server 2019 64bit Standard in a VM under HyperV
- Apache 2.43 64bit from apachelounge
- php 8 beta1 64bit thread safe from php.net QA download
- php loaded as a module with php_module

Download address:

https://windows.php.net/downloads/qa/php-8.0.0beta1-Win32-vs16-x64.zip



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 [2020-08-05 17:07 UTC] cmb@php.net
-Status: Open +Status: Feedback -Assigned To: +Assigned To: cmb
 [2020-08-05 17:07 UTC] cmb@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 for *NIX and
http://bugs.php.net/bugs-generating-backtrace-win32.php for Win32

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.
 [2020-08-06 10:03 UTC] buschmann at nidsa dot net
-Status: Feedback +Status: Assigned -PHP Version: 8.0.0alpha3 +PHP Version: 8.0.0beta1
 [2020-08-06 10:03 UTC] buschmann at nidsa dot net
Crash dump as requested (when loading opcache_gui.php or prewarm with our application):


Report for httpd__PID__4300__Date__08_06_2020__Time_11_43_01AM__275__Second_Chance_Exception_C0000005.dmp





Type of Analysis Performed Crash Analysis 
Machine Name SAM_DEV_HB 
Operating System Windows Server - 17763 
Number Of Processors 2 
Process ID 4300 
Process Image N:\Apache\Apache24\bin\httpd.exe 
Command Line httpd -X 
System Up-Time 18 day(s) 18:08:55 
Process Up-Time 00:10:02 
Processor Type X64 
Process Bitness 64-Bit 



Faulting Thread




Entry point   libhttpd!ap_run_generate_log_id+3ab0 
Create time   06.08.2020 11:32:59 
Time spent in user mode   0 Days 0:0:0.421 
Time spent in kernel mode   0 Days 0:0:0.234 






    Arg 1

    Arg 2

    Arg 3

    Arg 4

  Source

php_opcache!zend_jit_trace_exit_is_hot+68 [C:\php-snap-build\php80\vs16\x64\php-8.0.0beta1-ts\ext\opcache\jit\zend_jit_trace.c @ 5386 + 4]     0000000`00000001     0000072`00000006     00001af`fd3d00d8     0007ff9`55d9490b   C:\php-snap-build\php80\vs16\x64\php-8.0.0beta1-ts\ext\opcache\jit\zend_jit_trace.c @ 5386 + 4 
php_opcache!zend_jit_trace_exit+a76 [C:\php-snap-build\php80\vs16\x64\php-8.0.0beta1-ts\ext\opcache\jit\zend_jit_trace.c @ 5753 + 47]     0001000`00000006     0000072`cebfd4a0     0000000`000000c6     00001af`fd86a500   C:\php-snap-build\php80\vs16\x64\php-8.0.0beta1-ts\ext\opcache\jit\zend_jit_trace.c @ 5753 + 47 
0x00001000`02000613     0000072`cebfd4a0     0000000`000000c6     00001af`fd86a500     0000000`00000003    
0x00001000`00000006     0000000`000000c6     00001af`fd86a500     0000000`00000003     00001af`fd88835c    
0x00000072`cebfd4a0     00001af`fd86a500     0000000`00000003     00001af`fd88835c     0000e50`028ac6b0    
0x000000c6     0000000`00000003     00001af`fd88835c     0000e50`028ac6b0     0000072`cebfd5b0    
0x000001af`fd86a500     00001af`fd88835c     0000e50`028ac6b0     0000072`cebfd5b0     00001af`fd3d00d8    
0x00000003     0000e50`028ac6b0     0000072`cebfd5b0     00001af`fd3d00d8     00001af`fd4a0cf0    
0x000001af`fd88835c     0000072`cebfd5b0     00001af`fd3d00d8     00001af`fd4a0cf0     00001af`fd8123c0    
0x00000e50`028ac6b0     00001af`fd3d00d8     00001af`fd4a0cf0     00001af`fd8123c0     00001af`fd3d00d8    
0x00000072`cebfd5b0     00001af`fd4a0cf0     00001af`fd8123c0     00001af`fd3d00d8     0000000`00000000    
0x000001af`fd3d00d8     00001af`fd8123c0     00001af`fd3d00d8     0000000`00000000     00001af`fd812350    
0x000001af`fd4a0cf0     00001af`fd3d00d8     0000000`00000000     00001af`fd812350     00001af`fab338e0    
0x000001af`fd8123c0     0000000`00000000     00001af`fd812350     00001af`fab338e0     00001af`fd3d00d8    
0x000001af`fd3d00d8     00001af`fd812350     00001af`fab338e0     00001af`fd3d00d8     0000000`00000008    






CLR Information






Exception Information


PHP_OPCACHE!ZEND_JIT_TRACE_EXIT_IS_HOT+68In httpd__PID__4300__Date__08_06_2020__Time_11_43_01AM__275__Second_Chance_Exception_C0000005.dmp the assembly instruction at php_opcache!zend_jit_trace_exit_is_hot+68 in N:\Apache\php8\ext\php_opcache.dll from The PHP Group has caused an access violation exception (0xC0000005) when trying to read from memory location 0x00000006 on thread 97




Module Information 

Image Name: N:\Apache\php8\ext\php_opcache.dll   Symbol Type:  PDB 
Base address: 0x00000003`00905a4d   Time Stamp:  Tue Aug 4 22:51:55 2020  
Checksum: 0x00000000`00000000   Comments:  Thanks to Andi Gutmans, Zeev Suraski, Stanislav Malyshev, Dmitry Stogov, Xinchen Hui 
COM DLL: False   Company Name:  The PHP Group 
ISAPIExtension: False   File Description:  Opcache 
ISAPIFilter: False   File Version:  8.0.0beta1 
Managed DLL: False   Internal Name:  OPCACHE extension 
VB DLL: False   Legal Copyright:  Copyright © The PHP Group 
Loaded Image Name:  php_opcache.dll   Legal Trademarks:  PHP 
Mapped Image Name:     Original filename:  php_opcache.dll 
Module name:  php_opcache   Private Build:   
Single Threaded:  False   Product Name:  PHP 
Module Size:  1,46 MBytes   Product Version:  8.0.0beta1 
Symbol File Name:  n:\apache\php8debug\php_opcache.pdb   Special Build:  &
 [2020-08-06 10:16 UTC] cmb@php.net
-Status: Assigned +Status: Open -Package: Reproducible crash +Package: JIT -Assigned To: cmb +Assigned To:
 [2020-08-06 10:16 UTC] cmb@php.net
Thanks!  This is apparently a tracing JIT issue.  Please try with

  opcache.jit=1205
 [2020-08-06 13:06 UTC] buschmann at nidsa dot net
When set

opcache.jit=1205

the opcache_gui and prewarm and a quick test of the application seem OK now.
(Only tested in httpd -X mode for now)

It seems I cannot provide more info to come to the root cause.

Thanks for investigating.
 
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Last updated: Fri Oct 30 05:02:34 2020 UTC