As the count of memcached's slabs has changed in version 1.4.23 (from 200 to 64) the function ascii_dump (libmemcached/dump.cc) of dev-libs/libmemcached is no longer compatible with >=net-misc/memcached-1.4.23. This function produces a SIGABRT because there (always) fails a libc-assert for the 65th (non-existing) slab. You can see this assertion in libmemcached/dump.cc on line 126 (current libmemcached-1.0.18) where this is happening in a for loop with a fixed count of 200 slabs. Steps to reproduce: * Use dev-php/pecl-memcached with PHP * Call PHP's Memcached::getAllKeys() with a memcached server >=1.4.23 * PHP-FPM child will make a SIGABRT, nginx's returning 502 Expected behavior: * Get all keys (non-atomic) in PHP and not a SIGABRT There is also a corresponding bug on launchpad for libmemcached: https://bugs.launchpad.net/libmemcached/+bug/1534062 Output of CLI: php: libmemcached/dump.cc:126: memcached_return_t ascii_dump(Memcached*, memcached_return_t (**)(const memcached_st*, const char*, size_t, void*), void*, uint32_t): Assertion `response_rc == MEMCACHED_SUCCESS' failed GDB backtrace from php-fpm: (gdb) bt #0 0x00007f7cf77171f7 in raise () from /lib64/libc.so.6 #1 0x00007f7cf771864a in abort () from /lib64/libc.so.6 #2 0x00007f7cf771027d in ?? () from /lib64/libc.so.6 #3 0x00007f7cf7710332 in __assert_fail () from /lib64/libc.so.6 #4 0x00007f7cf224336d in ascii_dump (memc=0x2e2eed0, callback=0x7ffe5044dbf0, context=0x3006838, number_of_callbacks=1) at libmemcached/dump.cc:126 #5 0x00007f7cf22434b3 in memcached_dump (shell=0x2e2eed0, callback=0x7ffe5044dbf0, context=0x3006838, number_of_callbacks=1) at libmemcached/dump.cc:158 #6 0x00007f7cf24c994d in zim_Memcached_getAllKeys () from /usr/lib64/php5.6/lib/extensions/debug-non-zts-20131226/memcached.so #7 0x000000000097e3f6 in execute_internal (execute_data_ptr=0x7f7cfbcdcb10, fci=0x0, return_value_used=1) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_execute.c:1527 #8 0x00007f7cf433a7b7 in xdebug_execute_internal () from /usr/lib64/php5.6/lib/extensions/debug-non-zts-20131226/xdebug.so #9 0x000000000097f847 in zend_do_fcall_common_helper_SPEC (execute_data=0x7f7cfbcdcb10) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:560 #10 0x000000000097ffeb in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (execute_data=0x7f7cfbcdcb10) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:693 #11 0x000000000098247a in ZEND_USER_OPCODE_SPEC_HANDLER (execute_data=0x7f7cfbcdcb10) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:1330 #12 0x000000000097ee80 in execute_ex (execute_data=0x7f7cfbcdcb10) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:363 #13 0x00007f7cf433a1b2 in xdebug_execute_ex () from /usr/lib64/php5.6/lib/extensions/debug-non-zts-20131226/xdebug.so #14 0x000000000097ef09 in zend_execute (op_array=0x2eb0bd0) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:388 #15 0x000000000097fa33 in zend_do_fcall_common_helper_SPEC (execute_data=0x7f7cfbcdc9a8) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:592 #16 0x000000000097ffeb in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (execute_data=0x7f7cfbcdc9a8) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:693 #17 0x000000000098247a in ZEND_USER_OPCODE_SPEC_HANDLER (execute_data=0x7f7cfbcdc9a8) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:1330 #18 0x000000000097ee80 in execute_ex (execute_data=0x7f7cfbcdc9a8) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:363 #19 0x00007f7cf433a1b2 in xdebug_execute_ex () from /usr/lib64/php5.6/lib/extensions/debug-non-zts-20131226/xdebug.so #20 0x000000000097ef09 in zend_execute (op_array=0x2eb0000) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:388 #21 0x000000000097fa33 in zend_do_fcall_common_helper_SPEC (execute_data=0x7f7cfbcdc888) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:592 #22 0x000000000097ffeb in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (execute_data=0x7f7cfbcdc888) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:693 #23 0x000000000098247a in ZEND_USER_OPCODE_SPEC_HANDLER (execute_data=0x7f7cfbcdc888) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:1330 #24 0x000000000097ee80 in execute_ex (execute_data=0x7f7cfbcdc888) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:363 #25 0x00007f7cf433a1b2 in xdebug_execute_ex () from /usr/lib64/php5.6/lib/extensions/debug-non-zts-20131226/xdebug.so #26 0x000000000097ef09 in zend_execute (op_array=0x2eaf6d0) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:388 #27 0x000000000097fa33 in zend_do_fcall_common_helper_SPEC (execute_data=0x7f7cfbcdc5d8) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:592 #28 0x000000000097ffeb in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (execute_data=0x7f7cfbcdc5d8) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:693 #29 0x000000000098247a in ZEND_USER_OPCODE_SPEC_HANDLER (execute_data=0x7f7cfbcdc5d8) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:1330 #30 0x000000000097ee80 in execute_ex (execute_data=0x7f7cfbcdc5d8) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:363 #31 0x00007f7cf433a1b2 in xdebug_execute_ex () from /usr/lib64/php5.6/lib/extensions/debug-non-zts-20131226/xdebug.so #32 0x000000000097ef09 in zend_execute (op_array=0x2e42498) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend_vm_execute.h:388 #33 0x00000000009371fa in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/Zend/zend.c:1341 #34 0x0000000000899ad7 in php_execute_script (primary_file=0x7ffe50450870) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/main/main.c:2613 #35 0x0000000000a01b3b in main (argc=5, argv=0x7ffe50452d68) at /var/tmp/portage/dev-lang/php-5.6.20/work/sapis-build/fpm/sapi/fpm/fpm/fpm_main.c:1989
I can confirm this, the memdump tool will also make a SIGABRT.
Does this happen with newer versions (1.4.39 is now stable, 1.5.1 is the next target)?
1.5.2 is stable for some now, and 1.5.5 was just added, does this occur in either of these? I'm going to close this bug in a month if no response.
closing, feel free to reopen if still applicable.