Bug #74526 [NEW]: Segfault generating phar.php

From: coypu at sdf dot org Operating system: NetBSD PHP version: 7.1.4 Package: Compile Failure Bug Type: Bug Bug description:Segfault generating phar.php Description: ------------ Hi, NetBSD 7.0 i386 builds are consistently segfaulting generating phar.php Example build log: http://nyftp.netbsd.org/pub/pkgsrc/packages/reports/2017Q1/NetBSD-7.0-i386/20170430.0103/php-7.1.3nb1/build.log (Sorry for reporting a bug against 7.1.3, I didn't notice as I was experimenting, and this is in an extremely slow VM - I don't see relevant changes in 7.1.4) We have some local modifications to the package, you can view them here: https://github.com/NetBSD/pkgsrc/tree/trunk/lang/php71 (None of them touch deep PHP internals) A backtrace of such a segfault is: (gdb) core ./work/php-7.1.3/php.core [New process 1] Core was generated by `php'. Program terminated with signal SIGSEGV, Segmentation fault. #0 0x0857b17b in zval_get_type (pz=0x7ae11780) at /pkgsrc/lang/php71/work/php-7.1.3/Zend/zend_types.h:332 332 return pz->u1.v.type; (gdb) bt #0 0x0857b17b in zval_get_type (pz=0x7ae11780) at /pkgsrc/lang/php71/work/php-7.1.3/Zend/zend_types.h:332 #1 ZEND_UNSET_DIM_SPEC_CV_CONST_HANDLER () at /pkgsrc/lang/php71/work/php-7.1.3/Zend/zend_vm_execute.h:39969 #2 0x084f5b20 in execute_ex (ex=0xbb214020) at /pkgsrc/lang/php71/work/php-7.1.3/Zend/zend_vm_execute.h:429 #3 0x084f6237 in zend_execute (op_array=0xbb26d080, return_value=0x0) at /pkgsrc/lang/php71/work/php-7.1.3/Zend/zend_vm_execute.h:474 #4 0x0847b116 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /pkgsrc/lang/php71/work/php-7.1.3/Zend/zend.c:1476 #5 0x083ec7e0 in php_execute_script (primary_file=0xbfbfdce0) at /pkgsrc/lang/php71/work/php-7.1.3/main/main.c:2537 #6 0x085c034c in do_cli (argc=14, argv=0xbfbfded8) at /pkgsrc/lang/php71/work/php-7.1.3/sapi/cli/php_cli.c:993 #7 0x085c1228 in main (argc=14, argv=0xbfbfded8) at /pkgsrc/lang/php71/work/php-7.1.3/sapi/cli/php_cli.c:1381 I personally attempted to build the package in qemu-system-i386, using GCC 4.8.5. I've made the following change that made me able to build it: --- configure.orig 2017-04-11 15:37:37.000000000 +0000 +++ configure @@ -5737,10 +5737,7 @@ if test "$ZEND_GCC_GLOBAL_REGS" != "no"; #else # define ZEND_GCC_VERSION 0 #endif -#if defined(__GNUC__) && ZEND_GCC_VERSION >= 4008 && defined(i386) -# define ZEND_VM_FP_GLOBAL_REG "%esi" -# define ZEND_VM_IP_GLOBAL_REG "%edi" -#elif defined(__GNUC__) && ZEND_GCC_VERSION >= 4008 && defined(__x86_64__) +#if defined(__GNUC__) && ZEND_GCC_VERSION >= 4008 && defined(__x86_64__) # define ZEND_VM_FP_GLOBAL_REG "%r14" # define ZEND_VM_IP_GLOBAL_REG "%r15" #elif defined(__GNUC__) && ZEND_GCC_VERSION >= 4008 && defined(__powerpc64__) Disabling the use of a global register for i386 (I think). I don't have a rationale for it, I just found it unbelievable that such a thing works, and disabling it did the trick. This may be a GCC bug if you believe it should work. -- Edit bug report at https://bugs.php.net/bug.php?id=74526&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=74526&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=74526&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=74526&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=74526&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=74526&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=74526&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=74526&r=needscript Try newer version: https://bugs.php.net/fix.php?id=74526&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=74526&r=support Expected behavior: https://bugs.php.net/fix.php?id=74526&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=74526&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=74526&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=74526&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=74526&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=74526&r=dst IIS Stability: https://bugs.php.net/fix.php?id=74526&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=74526&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=74526&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=74526&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=74526&r=mysqlcfg