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Date: Mon, 17 Jan 2011 15:45:55 +0100
From: Rainer Jung <rainer.jung@kippdata.de>
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To: "dev@httpd.apache.org" <dev@httpd.apache.org>
Subject: Startup crash for trunk on Solaris after proxy refactoring
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Hi,

I get a crash on Solaris Sparc during startup in the test suite after 
the proxy refactoring. Since it is a "Bus error" I wildly guess the root 
cause is an alignment issue in the shared memory. Sparc ist sensible to 
that and the only other Bus error or httpd I remember was wrong 
alignment in shm for mod_ssl shmcb (long ago).

GDB output:

#0  0xfdfdd028 in ap_proxy_initialize_worker (worker=0x3cf6f8, 
s=0x3ceb90, p=0x8a9a8)
     at 
/shared/build/dev/httpd/sources/httpd/trunk/r1059644/modules/proxy/proxy_util.c:1760
1760                worker->s->retry = 
apr_time_from_sec(PROXY_WORKER_DEFAULT_RETRY);
(gdb) bt full
#0  0xfdfdd028 in ap_proxy_initialize_worker (worker=0x3cf6f8, 
s=0x3ceb90, p=0x8a9a8)
     at 
/shared/build/dev/httpd/sources/httpd/trunk/r1059644/modules/proxy/proxy_util.c:1760
         rv = 0
         mpm_threads = -27836648
#1  0xfdef4b54 in balancer_child_init (p=0x50e040, s=0x3ceb90) at 
/shared/build/dev/httpd/sources/httpd/trunk/r1059644/modules/proxy/mod_proxy_balancer.c:122
         size = 472
         num = 2
         balancer = (proxy_balancer *) 0x3e8d58
         i = 0
         sconf = (void *) 0x0
         conf = (proxy_server_conf *) 0x3e8c48
         rv = 0
#2  0x000448d8 in ap_run_child_init (pchild=0x50e040, s=0x8f478) at 
/shared/build/dev/httpd/sources/httpd/trunk/r1059644/server/config.c:160
         pHook = (ap_LINK_child_init_t *) 0xfdef6370
         n = 10
#3  0xfdb625b8 in child_main (child_num_arg=0) at 
/shared/build/dev/httpd/sources/httpd/trunk/r1059644/server/mpm/prefork/prefork.c:509
         thd = (apr_thread_t *) 0x50e080
         osthd = 1
         ptrans = (apr_pool_t *) 0x510050
         allocator = (apr_allocator_t *) 0x4d7fa8
         status = 0
         i = -38310956
         lr = (ap_listen_rec *) 0xfdb76be4
         pollset = (apr_pollset_t *) 0x0
         sbh = (ap_sb_handle_t *) 0x0
         bucket_alloc = (apr_bucket_alloc_t *) 0x0
         last_poll_idx = 0
         lockfile = 0x0
#4  0xfdb62d7c in make_child (s=0x0, slot=0) at 
/shared/build/dev/httpd/sources/httpd/trunk/r1059644/server/mpm/prefork/prefork.c:708
         pid = -38394916
#5  0xfdb639e0 in prefork_run (_pconf=0x7f33c, plog=0xbb288, s=0x8f478) 
at 
/shared/build/dev/httpd/sources/httpd/trunk/r1059644/server/mpm/prefork/prefork.c:932
         status = -27184100
         pid = {pid = 520952, in = 0x6, out = 0xffbff698, err = 0x44c10}
         child_slot = 586872
         exitwhy = 4267715968
         processed_status = 766600
         index = 766600
         remaining_children_to_start = -4196752
#6  0x00030cd4 in ap_run_mpm (pconf=0x8a9a8, plog=0xbb288, s=0x8f478) at 
/shared/build/dev/httpd/sources/httpd/trunk/r1059644/server/mpm_common.c:90
         pHook = (ap_LINK_mpm_t *) 0x0
         n = 0
         rv = 567720
#7  0x0002bb74 in main (argc=8, argv=0xffbff82c) at 
/shared/build/dev/httpd/sources/httpd/trunk/r1059644/server/main.c:737
         exit_status = 0
         c = 88 'X'
         configtestonly = 387072
         showcompile = 389800
         confname = 0xffbffa03 
"/shared/build/dev/httpd/test/httpd/trunk/r1059644/prefork-solaris10.sparc-1.4.2-1-1.3.10-2-all-default/t/conf/httpd.conf"
         def_server_root = 0xffbff997 
"/shared/build/dev/httpd/test/httpd/trunk/r1059644/prefork-solaris10.sparc-1.4.2-1-1.3.10-2-all-default/t"
         temp_error_log = 0x7ec00 ""
         error = 0x8a9a8 ""
         pconf = (apr_pool_t *) 0x8a9a8
         plog = (apr_pool_t *) 0xbb288
         ptemp = (apr_pool_t *) 0xbfca0
         pcommands = (apr_pool_t *) 0x8c9b0
         opt = (apr_getopt_t *) 0x8ca50
         rv = 520192
         mod = (module **) 0x7f000
         opt_arg = 0x0
         signal_server = (apr_OFN_ap_signal_server_t *) 0x2
(gdb) print worker->s
$1 = (proxy_worker_shared *) 0xfe49000c


Regards,

Rainer