Bug #73668 [NEW]: "SIGFPE Arithmetic exception" in opcache when divide by minus 1
From: richardh at channelgrabber dot com
Operating system: Ubuntu 14.04.1 LTS
PHP version: 7.1.0
Package: opcache
Bug Type: Bug
Bug description:"SIGFPE Arithmetic exception" in opcache when divide by minus 1
Description:
------------
We recently switched to PHP 7.1.0 and noticed that when
https://github.com/Setasign/FPDF/blob/master/fpdf.php
was included it
caused PHP to exit with SIGFPE.
We installed the debug symbols and ran it through GDB a few times,
reducing the issue down to lines 901 and 902
(https://github.com/Setasign/FPDF/blob/master/fpdf.php#L901).
From this we created the reduced test case attached below.
The backtrace from the error is:
#0 0x00007ffff5b069a7 in zend_inference_calc_range
(op_array=op_array@entry=0x7ffff6075008, ssa=ssa@entry=0x7ffff6097028,
var=var@entry=1,
widening=widening@entry=0, narrowing=narrowing@entry=1,
tmp=tmp@entry=0x7fffffffa7f0)
at
/build/php7.1-kMIlXM/php7.1-7.1.0/ext/opcache/Optimizer/zend_inference.c:727
#1 0x00007ffff5b0c21f in zend_infer_ranges
(op_array=op_array@entry=0x7ffff6075008, ssa=ssa@entry=0x7ffff6097028)
at
/build/php7.1-kMIlXM/php7.1-7.1.0/ext/opcache/Optimizer/zend_inference.c:1954
#2 0x00007ffff5b133f3 in zend_ssa_inference
(arena=arena@entry=0x7fffffffa960,
op_array=op_array@entry=0x7ffff6075008, script=0x7ffff6075000,
ssa=ssa@entry=0x7ffff6097028) at
/build/php7.1-kMIlXM/php7.1-7.1.0/ext/opcache/Optimizer/zend_inference.c:4181
#3 0x00007ffff5afb7f7 in zend_dfa_analyze_op_array
(op_array=0x7ffff6075008, ctx=ctx@entry=0x7fffffffa960,
ssa=0x7ffff6097028, flags=0x7ffff6097024)
at
/build/php7.1-kMIlXM/php7.1-7.1.0/ext/opcache/Optimizer/dfa_pass.c:106
#4 0x00007ffff5aef7e7 in zend_optimize_script
(script=script@entry=0x7ffff6075000, optimization_level=2147467263,
debug_level=0)
at
/build/php7.1-kMIlXM/php7.1-7.1.0/ext/opcache/Optimizer/zend_optimizer.c:967
#5 0x00007ffff5adf1c4 in cache_script_in_shared_memory
(from_shared_memory=<synthetic pointer>, key_length=22,
key=0x7ffff5d2e6cc <accel_globals+556> "test.php:223344:223384",
new_persistent_script=0x7ffff6075000)
at
/build/php7.1-kMIlXM/php7.1-7.1.0/ext/opcache/ZendAccelerator.c:1271
#6 persistent_compile_file (file_handle=<optimized out>, type=8) at
/build/php7.1-kMIlXM/php7.1-7.1.0/ext/opcache/ZendAccelerator.c:1863
#7 0x00007ffff589ff9d in xdebug_compile_file (file_handle=<optimized
out>, type=<optimized out>) at
/build/xdebug-_hXbf9/xdebug-2.5.0/build-7.1/xdebug.c:2153
#8 0x00005555557b469d in zend_execute_scripts ()
#9 0x0000555555754b18 in php_execute_script ()
#10 0x000055555584e1c9 in ?? ()
#11 0x000055555563d92f in main ()
Test script:
---------------
<?php
$a/-1;
--
Edit bug report at https://bugs.php.net/bug.php?id=73668&edit=1
--
Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=73668&r=trysnapshot54
Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=73668&r=trysnapshot55
Try a snapshot (trunk): https://bugs.php.net/fix.php?id=73668&r=trysnapshottrunk
Fixed in SVN: https://bugs.php.net/fix.php?id=73668&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=73668&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=73668&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=73668&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=73668&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=73668&r=support
Expected behavior: https://bugs.php.net/fix.php?id=73668&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=73668&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=73668&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=73668&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=73668&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=73668&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=73668&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=73668&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=73668&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=73668&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=73668&r=mysqlcfg
Thread (3 messages)
- richardh at channelgrabber dot com