Hi, I'm trying to resolve memcached segfault that hit me recently. I'm using small instance of memcached (64MB) on Unix socket to collect some statistics (counters). It was working great, but recently, some new counters were added and memcached started to segfault after every couple of minutes. Removing those counters makes it work again, so it is rather strange. I've been able to catch Valgrind stack trace of the crash:
==12825== Invalid write of size 1 ==12825== at 0x4A1C979: memset (mc_replace_strmem.c:479) ==12825== by 0x40336D: do_add_delta (memcached.c:1535) ==12825== by 0x403A36: process_arithmetic_command (memcached.c:1487) ==12825== by 0x405EB4: try_read_command (memcached.c:1689) ==12825== by 0x40642F: event_handler (memcached.c:2136) ==12825== by 0x4B230E1: event_base_loop (in /usr/lib/libevent-1.1a.so.1.0.2) ==12825== by 0x404862: main (memcached.c:3131) ==12825== Address 0x559A000 is 0 bytes after a block of size 1,048,528 alloc'd ==12825== at 0x4A1B858: malloc (vg_replace_malloc.c:149) ==12825== by 0x406FEA: do_slabs_alloc (slabs.c:399) ==12825== by 0x407A51: do_item_alloc (items.c:98) ==12825== by 0x404DBB: process_update_command (memcached.c:1420) ==12825== by 0x405BAB: try_read_command (memcached.c:1681) ==12825== by 0x40642F: event_handler (memcached.c:2136) ==12825== by 0x4B230E1: event_base_loop (in /usr/lib/libevent-1.1a.so.1.0.2) ==12825== by 0x404862: main (memcached.c:3131) I've been looking in the code myself, but function do_add_delta() seems ok in the part given by Valgrind. I've been also trying to look into memcached memory allocation functions, to search for anything there, but that wasn't successful either. I'm running Debian Etch AMD64 with hand compiled memcached 1.2.5 with applied patch fixing another crash (http://github.com/dustin/memcached/commit/6ec16c4). Process is run by the command: memcached -m 64 -s path -u nobody -M Maybe someone could give me any advice on this one? -- Janusz Dziemidowicz Administrator nasza-klasa.pl phone: +48500298526 email: [EMAIL PROTECTED] Nasza Klasa Sp. z o.o., ul. Dembowskiego 57/5, 51-670 Wrocław Sąd Rejonowy dla Wrocławia-Fabrycznej we Wrocławiu, VI Wydział Gospodarczy Krajowego Rejestru Sądowego, nr KRS:0000289629, NIP:898-21-22-104, REGON:020586020 Kapitał zakładowy: 67850 PLN
