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Bug #71712 Segmentation fault on ReflectionClass::newInstanceArgs
Submitted: 2016-03-04 13:00 UTC Modified: 2016-03-07 14:40 UTC
From: bashofmann at gmail dot com Assigned:
Status: Closed Package: memcached (PECL)
PHP Version: 7.0.4 OS: Ubuntu 14.04
Private report: No CVE-ID: None
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 [2016-03-04 13:00 UTC] bashofmann at gmail dot com 
Description:
------------
We get the following reproducible segmentation fault when running a unit test that is mocking some class which results in a ReflectionClass::newInstanceArgs. Unfortunately I was not able to reproduce this with a smaller sample script.

Is this backtrace enough to find the cause and fix it?


GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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and "show warranty" for details.
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Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
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For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /home/researchgate/.phpbrew/php/php-7.0.4/bin/php...done.
[New LWP 16027]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `php bin/phpunit test/unit/modules/literature/classes/ClaimingServiceTest.php'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x000000000084ad49 in zend_mm_alloc_small (heap=0x7fd514800040, size=40, bin_num=4, __zend_filename=0xe9ec78 "/home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_opcode.c", __zend_lineno=59,
    __zend_orig_filename=0x0, __zend_orig_lineno=0) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_alloc.c:1291
1291			heap->free_slot[bin_num] = p->next_free_slot;
Traceback (most recent call last):
  File "/usr/share/gdb/auto-load/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19-gdb.py", line 63, in <module>
    from libstdcxx.v6.printers import register_libstdcxx_printers
ImportError: No module named 'libstdcxx'
(gdb) bt
#0  0x000000000084ad49 in zend_mm_alloc_small (heap=0x7fd514800040, size=40, bin_num=4, __zend_filename=0xe9ec78 "/home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_opcode.c", __zend_lineno=59,
    __zend_orig_filename=0x0, __zend_orig_lineno=0) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_alloc.c:1291
#1  0x000000000084afa0 in zend_mm_alloc_heap (heap=0x7fd514800040, size=40, __zend_filename=0xe9ec78 "/home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_opcode.c", __zend_lineno=59, __zend_orig_filename=0x0,
    __zend_orig_lineno=0) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_alloc.c:1358
#2  0x000000000084da03 in _emalloc (size=4, __zend_filename=0xe9ec78 "/home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_opcode.c", __zend_lineno=59, __zend_orig_filename=0x0, __zend_orig_lineno=0)
    at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_alloc.c:2442
#3  0x000000000086d2ca in init_op_array (op_array=0x7fd50ff73040, type=2 '\002', initial_ops_size=64) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_opcode.c:59
#4  0x000000000085c724 in zend_compile_func_decl (result=0x0, ast=0x7fd51181ba00) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_compile.c:4858
#5  0x000000000086335d in zend_compile_stmt (ast=0x7fd51181ba00) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_compile.c:7065
#6  0x000000000085ac80 in zend_compile_stmt_list (ast=0x7fd51181bb48) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_compile.c:4358
#7  0x0000000000863226 in zend_compile_stmt (ast=0x7fd51181bb48) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_compile.c:7009
#8  0x000000000085db91 in zend_compile_class_decl (ast=0x7fd51181bb98) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_compile.c:5305
#9  0x000000000086339e in zend_compile_stmt (ast=0x7fd51181bb98) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_compile.c:7077
#10 0x0000000000862fd5 in zend_compile_top_stmt (ast=0x7fd51181bb98) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_compile.c:6983
#11 0x0000000000862fb7 in zend_compile_top_stmt (ast=0x7fd51181bbe0) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_compile.c:6978
#12 0x0000000000827fa6 in compile_file (file_handle=0x7ffd37faa370, type=2) at Zend/zend_language_scanner.l:607
#13 0x00000000006864f8 in phar_compile_file (file_handle=0x7ffd37faa370, type=2) at /home/researchgate/.phpbrew/build/php-7.0.4/ext/phar/phar.c:3311
#14 0x0000000000828155 in compile_filename (type=2, filename=0x7fd514821640) at Zend/zend_language_scanner.l:647
#15 0x000000000091852e in ZEND_INCLUDE_OR_EVAL_SPEC_CV_HANDLER () at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_vm_execute.h:29135
#16 0x00000000008dc2cc in execute_ex (ex=0x7fd514821530) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_vm_execute.h:414
#17 0x0000000000869b52 in zend_call_function (fci=0x7ffd37faa770, fci_cache=0x7ffd37faa740) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_execute_API.c:860
#18 0x00000000008a6df6 in zend_call_method (object=0x7fd511a6cbe8, obj_ce=0x7fd514802620, fn_proxy=0x7fd511a6cbe0, function_name=0x7fd511e025c8 "composer\\autoload\\classloader::loadclass\001",
    function_name_len=44, retval_ptr=0x0, param_count=1, arg1=0x7fd514821520, arg2=0x0) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_interfaces.c:104
#19 0x00000000006dc1c3 in zif_spl_autoload_call (execute_data=0x7fd5148214c0, return_value=0x7ffd37faaa40) at /home/researchgate/.phpbrew/build/php-7.0.4/ext/spl/php_spl.c:429
#20 0x0000000000869c79 in zend_call_function (fci=0x7ffd37faaa80, fci_cache=0x7ffd37faaa50) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_execute_API.c:879
#21 0x000000000086a3f7 in zend_lookup_class_ex (name=0x7fd511ed8850, key=0x7fd510f88540, use_autoload=1) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_execute_API.c:1041
#22 0x000000000086af40 in zend_fetch_class_by_name (class_name=0x7fd511ed8850, key=0x7fd510f88540, fetch_type=512) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_execute_API.c:1387
#23 0x00000000008e3b3a in ZEND_NEW_SPEC_CONST_HANDLER () at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_vm_execute.h:3354
#24 0x00000000008dc2cc in execute_ex (ex=0x7fd514820a60) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_vm_execute.h:414
#25 0x0000000000869b52 in zend_call_function (fci=0x7ffd37faade0, fci_cache=0x7ffd37faadb0) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_execute_API.c:860
#26 0x00000000006b1c3b in zim_reflection_class_newInstanceArgs (execute_data=0x7fd5148209f0, return_value=0x7fd5148207c0) at /home/researchgate/.phpbrew/build/php-7.0.4/ext/reflection/php_reflection.c:4743
#27 0x00000000008dd44a in ZEND_DO_FCALL_SPEC_HANDLER () at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_vm_execute.h:842
#28 0x00000000008dc2cc in execute_ex (ex=0x7fd514813030) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_vm_execute.h:414
#29 0x00000000008dc3de in zend_execute (op_array=0x7fd514877100, return_value=0x0) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend_vm_execute.h:458
#30 0x0000000000881214 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /home/researchgate/.phpbrew/build/php-7.0.4/Zend/zend.c:1427
#31 0x00000000007ee5cd in php_execute_script (primary_file=0x7ffd37fad430) at /home/researchgate/.phpbrew/build/php-7.0.4/main/main.c:2484
#32 0x0000000000940756 in do_cli (argc=3, argv=0x1b0e010) at /home/researchgate/.phpbrew/build/php-7.0.4/sapi/cli/php_cli.c:974
#33 0x000000000094191a in main (argc=3, argv=0x1b0e010) at /home/researchgate/.phpbrew/build/php-7.0.4/sapi/cli/php_cli.c:1345

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 [2016-03-04 13:05 UTC] nikic@php.net 
Can you check whether running the unit test through USE_ZEND_ALLOC=0 valgrind results in any errors?
 [2016-03-04 17:13 UTC] bashofmann at gmail dot com 
You mean like this:

USE_ZEND_ALLOC=0 bin/phpunit test/unit/modules/literature/classes/ClaimingServiceTest.php
PHPUnit 5.2.9 by Sebastian Bergmann and contributors.

Runtime:       PHP 7.0.4-1+deb.sury.org~trusty+1 with Xdebug 2.4.0RC4
Configuration: /home/researchgate/rg_dev/community/phpunit.xml

*** Error in `php': double free or corruption (fasttop): 0x00007fdbd720c5a0 ***
Aborted (core dumped)
 [2016-03-04 17:25 UTC] nikic@php.net 
I mean this:

    USE_ZEND_ALLOC=0 valgrind bin/phpunit test/unit/modules/literature/classes/ClaimingServiceTest.php
 [2016-03-04 17:28 UTC] bashofmann at gmail dot com 
Looks the same:

$ USE_ZEND_ALLOC=0 valgrind bin/phpunit test/unit/modules/literature/classes/ClaimingServiceTest.php
==10358== Memcheck, a memory error detector
==10358== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==10358== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info
==10358== Command: bin/phpunit test/unit/modules/literature/classes/ClaimingServiceTest.php
==10358==
PHPUnit 5.2.9 by Sebastian Bergmann and contributors.

Runtime:       PHP 7.0.4-1+deb.sury.org~trusty+1 with Xdebug 2.4.0RC4
Configuration: /home/researchgate/rg_dev/community/phpunit.xml

*** Error in `php': double free or corruption (fasttop): 0x00007f0d68b4a310 ***
Aborted (core dumped)
 [2016-03-04 17:43 UTC] nikic@php.net 
Ah, likely you need to add --trace-children=yes to the valgrind invocation (bin/phpunit is probably a shell script or something).
 [2016-03-04 17:56 UTC] bashofmann at gmail dot com 
Now I get:

$ USE_ZEND_ALLOC=0 valgrind --trace-children=yes bin/phpunit test/unit/modules/literature/classes/ClaimingServiceTest.php
==11730== Memcheck, a memory error detector
==11730== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==11730== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info
==11730== Command: bin/phpunit test/unit/modules/literature/classes/ClaimingServiceTest.php
==11730==
==11730== Memcheck, a memory error detector
==11730== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==11730== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info
==11730== Command: /usr/bin/php bin/phpunit test/unit/modules/literature/classes/ClaimingServiceTest.php
==11730==
==11738== Memcheck, a memory error detector
==11738== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==11738== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info
==11738== Command: /bin/sh -c stty\ size
==11738==
==11739== Memcheck, a memory error detector
==11739== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==11739== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info
==11739== Command: /bin/stty size
==11739==
==11739==
==11739== HEAP SUMMARY:
==11739==     in use at exit: 0 bytes in 0 blocks
==11739==   total heap usage: 147 allocs, 147 frees, 15,846 bytes allocated
==11739==
==11739== All heap blocks were freed -- no leaks are possible
==11739==
==11739== For counts of detected and suppressed errors, rerun with: -v
==11739== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
==11738==
==11738== HEAP SUMMARY:
==11738==     in use at exit: 1,352 bytes in 38 blocks
==11738==   total heap usage: 40 allocs, 2 frees, 1,456 bytes allocated
==11738==
==11738== LEAK SUMMARY:
==11738==    definitely lost: 0 bytes in 0 blocks
==11738==    indirectly lost: 0 bytes in 0 blocks
==11738==      possibly lost: 0 bytes in 0 blocks
==11738==    still reachable: 1,352 bytes in 38 blocks
==11738==         suppressed: 0 bytes in 0 blocks
==11738== Rerun with --leak-check=full to see details of leaked memory
==11738==
==11738== For counts of detected and suppressed errors, rerun with: -v
==11738== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
PHPUnit 5.2.9 by Sebastian Bergmann and contributors.

Runtime:       PHP 7.0.4-1+deb.sury.org~trusty+1
Configuration: /home/researchgate/rg_dev/community/phpunit.xml

==11730== Invalid free() / delete / delete[] / realloc()
==11730==    at 0x4C2BDEC: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==11730==    by 0x1647A1A4: ??? (in /usr/lib/php/20151012/memcached.so)
==11730==    by 0x1647F51C: ??? (in /usr/lib/php/20151012/memcached.so)
==11730==    by 0x3CFA93: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==  Address 0x23a74070 is 0 bytes inside a block of size 8 free'd
==11730==    at 0x4C2BDEC: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==11730==    by 0x1647A12D: ??? (in /usr/lib/php/20151012/memcached.so)
==11730==    by 0x1647F4DA: ??? (in /usr/lib/php/20151012/memcached.so)
==11730==    by 0x3CFA93: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==
==11730== Invalid free() / delete / delete[] / realloc()
==11730==    at 0x4C2BDEC: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==11730==    by 0x1647A1AD: ??? (in /usr/lib/php/20151012/memcached.so)
==11730==    by 0x1647F51C: ??? (in /usr/lib/php/20151012/memcached.so)
==11730==    by 0x3CFA93: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==  Address 0x20a7a4f0 is 0 bytes inside a block of size 8 free'd
==11730==    at 0x4C2BDEC: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==11730==    by 0x1647A11B: ??? (in /usr/lib/php/20151012/memcached.so)
==11730==    by 0x1647F4DA: ??? (in /usr/lib/php/20151012/memcached.so)
==11730==    by 0x3CFA93: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==
==11730== Invalid free() / delete / delete[] / realloc()
==11730==    at 0x4C2BDEC: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==11730==    by 0x1647F51C: ??? (in /usr/lib/php/20151012/memcached.so)
==11730==    by 0x3CFA93: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==11730==  Address 0x1f102ac0 is 0 bytes inside a block of size 8 free'd
==11730==    at 0x4C2BDEC: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==11730==    by 0x1647A124: ??? (in /usr/lib/php/20151012/memcached.so)
==11730==    by 0x1647F4DA: ??? (in /usr/lib/php/20151012/memcached.so)
==11730==    by 0x3CFA93: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==11730==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==11730==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==11730==
.                                                                   1 / 1 (100%)

Time: 19.21 seconds, Memory: 0.00Mb

OK (1 test, 1 assertion)
==11730==
==11730== HEAP SUMMARY:
==11730==     in use at exit: 863,801 bytes in 5,088 blocks
==11730==   total heap usage: 1,497,514 allocs, 1,492,429 frees, 2,752,640,474 bytes allocated
==11730==
==11730== LEAK SUMMARY:
==11730==    definitely lost: 7,501 bytes in 51 blocks
==11730==    indirectly lost: 624,079 bytes in 2,886 blocks
==11730==      possibly lost: 212,626 bytes in 2,074 blocks
==11730==    still reachable: 19,595 bytes in 77 blocks
==11730==         suppressed: 0 bytes in 0 blocks
==11730== Rerun with --leak-check=full to see details of leaked memory
==11730==
==11730== For counts of detected and suppressed errors, rerun with: -v
==11730== ERROR SUMMARY: 3 errors from 3 contexts (suppressed: 0 from 0)
 [2016-03-04 18:12 UTC] nikic@php.net
-Package: Reproducible crash +Package: memcached
 [2016-03-04 18:12 UTC] nikic@php.net 
Okay, so this is a double free in the memcached extension. Reassigning package, though I'm not sure if they use this bug tracker (logging an issue on https://github.com/php-memcached-dev/php-memcached/issues probably won't hurt).
 [2016-03-05 02:24 UTC] rasmus@php.net
-Status: Open +Status: Feedback
 [2016-03-05 02:24 UTC] rasmus@php.net 
Where is your memcached extension build from?

Are you using the latest build from this php7 branch?

https://github.com/php-memcached-dev/php-memcached/tree/php7
 [2016-03-05 14:04 UTC] bashofmann at gmail dot com 
I can reproduce this with both the latest php-memcached package (2.2.0-95-g6ace07d+2.2.0-2+deb.sury.org~trusty+6) from https://launchpad.net/~ondrej/+archive/ubuntu/php as well as with the current HEAD of the php7 branch (https://github.com/php-memcached-dev/php-memcached/tree/php7)

When compiling from source I actually get a bit better debug output with line numbers pointing to the memcached source:

==2432== Invalid free() / delete / delete[] / realloc()
==2432==    at 0x4C2BDEC: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==2432==    by 0x1E845104: s_clear_keys (php_memcached.c:1345)
==2432==    by 0x1E84A20C: php_memc_get_impl (php_memcached.c:1409)
==2432==    by 0x3CFA93: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==  Address 0x23b2f6b0 is 0 bytes inside a block of size 8 free'd
==2432==    at 0x4C2BDEC: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==2432==    by 0x1E84508D: s_hash_to_keys (php_memcached.c:1321)
==2432==    by 0x1E84A1CA: s_key_to_keys (php_memcached.c:1334)
==2432==    by 0x1E84A1CA: php_memc_get_impl (php_memcached.c:1407)
==2432==    by 0x3CFA93: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==
==2432== Invalid free() / delete / delete[] / realloc()
==2432==    at 0x4C2BDEC: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==2432==    by 0x1E84510D: s_clear_keys (php_memcached.c:1346)
==2432==    by 0x1E84A20C: php_memc_get_impl (php_memcached.c:1409)
==2432==    by 0x3CFA93: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==  Address 0x6c5d6c0 is 0 bytes inside a block of size 8 free'd
==2432==    at 0x4C2BDEC: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==2432==    by 0x1E84507B: s_hash_to_keys (php_memcached.c:1319)
==2432==    by 0x1E84A1CA: s_key_to_keys (php_memcached.c:1334)
==2432==    by 0x1E84A1CA: php_memc_get_impl (php_memcached.c:1407)
==2432==    by 0x3CFA93: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==
==2432== Invalid free() / delete / delete[] / realloc()
==2432==    at 0x4C2BDEC: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==2432==    by 0x1E84A20C: php_memc_get_impl (php_memcached.c:1409)
==2432==    by 0x3CFA93: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==2432==  Address 0x23746220 is 0 bytes inside a block of size 8 free'd
==2432==    at 0x4C2BDEC: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==2432==    by 0x1E845084: s_hash_to_keys (php_memcached.c:1320)
==2432==    by 0x1E84A1CA: s_key_to_keys (php_memcached.c:1334)
==2432==    by 0x1E84A1CA: php_memc_get_impl (php_memcached.c:1407)
==2432==    by 0x3CFA93: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==    by 0x3CF75F: ??? (in /usr/bin/php7.0)
==2432==    by 0x3920CA: execute_ex (in /usr/bin/php7.0)
==2432==    by 0x347158: dtrace_execute_ex (in /usr/bin/php7.0)
==2432==
 [2016-03-05 14:05 UTC] bashofmann at gmail dot com 
I also just opened a ticket at the memcached github project:

https://github.com/php-memcached-dev/php-memcached/issues/224
 [2016-03-07 14:40 UTC] bashofmann at gmail dot com
-Status: Feedback +Status: Closed
 [2016-03-07 14:40 UTC] bashofmann at gmail dot com 
The bug is fixed in https://github.com/php-memcached-dev/php-memcached/commit/4ee38195289edfa7ae936d2b0a434869c97d8817
 
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