bug reproduced, happens pretty quickly once I stressed httpd2 with siege ...
On 16 January 2016 at 19:48, Pedro de Oliveira <falsov...@gmail.com> wrote: > Ignore what I said in the earlier email about "mpm_prefork", I wasnt > using it. Sorry. > > It still crashes after a few requests. This is the backtrace from > apache build with -O0 and -ggdb. > > # gdb --args httpd2 -X > (gdb) run > Starting program: /usr/local/sbin/httpd2 -X > ... > Program received signal SIGSEGV, Segmentation fault. > 0x000018a9b2875638 in ap_mpm_pod_check (pod=0x0) at mpm_unix.c:459 > 459 rv = apr_file_read(pod->pod_in, &c, &len); > (gdb) bt full > #0 0x000018a9b2875638 in ap_mpm_pod_check (pod=0x0) at mpm_unix.c:459 > c = -1 '▒' > len = 1 > rv = 2 > #1 0x000018ac9892d3bb in child_main (child_num_arg=0, child_bucket=0) > at prefork.c:732 > current_conn = (conn_rec *) 0x18abbed08f00 > csd = (void *) 0x18abb4508000 > thd = (apr_thread_t *) 0x18ac9e058b40 > osthd = 0x18abeee85920 > ptrans = (apr_pool_t *) 0x18abc3acce00 > allocator = (apr_allocator_t *) 0x18abe0001700 > status = 0 > i = -1 > lr = (ap_listen_rec *) 0x18abfdd7be00 > pollset = (apr_pollset_t *) 0x18abb4509e00 > sbh = (ap_sb_handle_t *) 0x18abed2a6e40 > bucket_alloc = (apr_bucket_alloc_t *) 0x18ac537a7028 > last_poll_idx = 1 > lockfile = 0x7f7ffffd4d20 "▒▒▒▒" > #2 0x000018ac9892d4d5 in make_child (s=0x18ac45b90d00, slot=0, > bucket=0) at prefork.c:767 > pid = 1 > #3 0x000018ac9892dc2d in prefork_run (_pconf=0x18abc7307d00, > plog=0x18abc7307700, s=0x18ac45b90d00) at prefork.c:979 > index = 6316 > remaining_children_to_start = 2134903585 > i = 6315 > #4 0x000018a9b283a8b7 in ap_run_mpm (pconf=0x18abc7307d00, > plog=0x18abc7307700, s=0x18ac45b90d00) at mpm_common.c:94 > pHook = (ap_LINK_mpm_t *) 0x18abd5664000 > n = 0 > rv = -1 > #5 0x000018a9b28324a3 in main (argc=2, argv=0x7f7ffffd5158) at main.c:777 > c = 88 'X' > showcompile = 0 > showdirectives = 0 > confname = 0x18a9b299083b "/etc/apache2/httpd2.conf" > def_server_root = 0x18a9b2990854 "/var/www" > temp_error_log = 0x0 > error = 0x0 > process = (process_rec *) 0x18ac9cb312c0 > pconf = (apr_pool_t *) 0x18abc7307d00 > plog = (apr_pool_t *) 0x18abc7307700 > ptemp = (apr_pool_t *) 0x18abbb0bb800 > pcommands = (apr_pool_t *) 0x18ac5cf89500 > opt = (apr_getopt_t *) 0x18ac48aed600 > rv = 0 > mod = (module **) 0x18a9b2cac518 > opt_arg = 0x0 > signal_server = (apr_OFN_ap_signal_server_t *) 0x18a9b2875ee5 > <ap_signal_server> > > > > On Sat, Jan 16, 2016 at 7:28 PM, Michael McConville <mm...@mykolab.com> wrote: >> Pedro de Oliveira wrote: >>> Following your tips I built Apache with -O0 and the segfaults in >>> "mpm_prefork" no longer happen. Maybe its a gcc optimization issue. I >>> dont know which -O OpenBSD uses by default, but I will try it also >>> with -O1 and report back. >> >> Remember, compiler optimizations can worsen the impact of undefined >> behavior. That seems more likely than a compiler bug to me. >
