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Bug#419720: apache2.2-common: unaligned trap in mod_ssl on alpha

Package: apache2.2-common
Version: 2.2.3-4
Severity: minor

mod_ssl is causing unaligned traps on alpha (backtrace is below). Here's the
offending section of code:

     1153     shmcb_safe_clear(idx, sizeof(SHMCBIndex));
     1154     shmcb_set_safe_time(&(idx->expires), expiry_time);
     1155     shmcb_set_safe_uint(&(idx->offset), new_offset);
     1156 
     1157     /* idx->removed = (unsigned char)0; */ /* Not needed given the memset above. */
     1158     idx->s_id2 = session_id[1];
     1159     ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
     1160                  "session_id[0]=%u, idx->s_id2=%u",
     1161                  session_id[0], session_id[1]);

I'm pretty new to the alpha, but I'm guessing the access to session_id[1] is
causing the trap, since session_id is an unsigned char * and idx->s_id2 seems
to be aligned on a 4- or 8-byte boundary.

I'm not sure of the best way to fix this. If there is anything I can do
(patch testing, etc.), please let me know!

Also, there seem to be a couple other less-frequent unaligned traps in
apache2 that I'm also trying to track down. Should I append them to this
bug, or is a separate one for each trap better?

Thanks!

#0  0x00000200017ffe54 in shmcb_insert_encoded_session (s=0x12023e428,
    queue=0x11fef8b00, cache=0x11fef8b20,
    encoded=0x11fef8b40 "0\201\221\002\001\001\002\002\003\001\004\002",
    encoded_len=148,
    session_id=0x1205e6b28 "\217\236�\234\210��߭u�\020����!w�6�taaй\024rU|G� ", expiry_time=1176822685)
    at /home/jwm/apache2-2.2.3/modules/ssl/ssl_scache_shmcb.c:1158
#1  0x00000200017fe8a0 in shmcb_store_session (s=0x12023e428,
    shm_segment=0x20003c94008,
    id=0x1205e6b28 "\217\236�\234\210��߭u�\020����!w�6�taaй\024rU|G� ",
    idlen=32, pSession=0x1205e6ae0, timeout=1176822685)
    at /home/jwm/apache2-2.2.3/modules/ssl/ssl_scache_shmcb.c:697
#2  0x00000200017fd68c in ssl_scache_shmcb_store (s=0x12023e428,
    id=0x1205e6b28 "\217\236�\234\210��߭u�\020����!w�6�taaй\024rU|G� ",
    idlen=32, timeout=1176822685, pSession=0x1205e6ae0)
    at /home/jwm/apache2-2.2.3/modules/ssl/ssl_scache_shmcb.c:411
#3  0x00000200017fb4e4 in ssl_scache_store (s=0x12023e428,
    id=0x1205e6b28 "\217\236�\234\210��߭u�\020����!w�6�taaй\024rU|G� ",
    idlen=32, expiry=1176822685, sess=0x1205e6ae0)
    at /home/jwm/apache2-2.2.3/modules/ssl/ssl_scache.c:99
#4  0x00000200017f0294 in ssl_callback_NewSessionCacheEntry (ssl=0x1205cbbe0,
    session=0x1205e6ae0)
    at /home/jwm/apache2-2.2.3/modules/ssl/ssl_engine_kernel.c:1638
#5  0x000002000080af98 in ssl_update_cache () from /usr/lib/libssl.so.0.9.8
#6  0x00000200007f0e20 in ssl3_accept () from /usr/lib/libssl.so.0.9.8
#7  0x000002000080a890 in SSL_accept () from /usr/lib/libssl.so.0.9.8
#8  0x00000200007fbb18 in ssl23_get_client_hello ()
   from /usr/lib/libssl.so.0.9.8
#9  0x00000200007fc750 in ssl23_accept () from /usr/lib/libssl.so.0.9.8
#10 0x000002000080a890 in SSL_accept () from /usr/lib/libssl.so.0.9.8
#11 0x00000200017ea408 in ssl_io_filter_connect (filter_ctx=0x120506490)
    at /home/jwm/apache2-2.2.3/modules/ssl/ssl_engine_io.c:1047
#12 0x00000200017eaeac in ssl_io_filter_input (f=0x1205d1308, bb=0x1205c71c0, 
    mode=AP_MODE_GETLINE, block=APR_BLOCK_READ, readbytes=0)
    at /home/jwm/apache2-2.2.3/modules/ssl/ssl_engine_io.c:1292
#13 0x000000012005bb98 in ap_get_brigade (next=0x1205d1308, bb=0x1205c71c0, 
    mode=AP_MODE_GETLINE, block=APR_BLOCK_READ, readbytes=0)
    at /home/jwm/apache2-2.2.3/server/util_filter.c:489
#14 0x000000012002f458 in ap_rgetline_core (s=0x1205c5c78, n=8192, 
    read=0x11fefb868, r=0x1205c5c48, fold=0, bb=0x1205c71c0)
    at /home/jwm/apache2-2.2.3/server/protocol.c:231
#15 0x000000012002ff0c in read_request_line (r=0x1205c5c48, bb=0x1205c71c0)
    at /home/jwm/apache2-2.2.3/server/protocol.c:596
#16 0x0000000120030e04 in ap_read_request (conn=0x120505b88)
    at /home/jwm/apache2-2.2.3/server/protocol.c:891
#17 0x0000000120061468 in ap_process_http_connection (c=0x120505b88)
    at /home/jwm/apache2-2.2.3/modules/http/http_core.c:177
#18 0x0000000120055918 in ap_run_process_connection (c=0x120505b88)
    at /home/jwm/apache2-2.2.3/server/connection.c:43
#19 0x0000000120055fa8 in ap_process_connection (c=0x120505b88, 
    csd=0x120505998) at /home/jwm/apache2-2.2.3/server/connection.c:178
#20 0x000000012006d894 in child_main (child_num_arg=0)
    at /home/jwm/apache2-2.2.3/server/mpm/prefork/prefork.c:640
#21 0x000000012006db58 in make_child (s=0x1200a6970, slot=0)
    at /home/jwm/apache2-2.2.3/server/mpm/prefork/prefork.c:736
#22 0x000000012006dc00 in startup_children (number_to_start=5)
    at /home/jwm/apache2-2.2.3/server/mpm/prefork/prefork.c:754
#23 0x000000012006e2dc in ap_mpm_run (_pconf=0x1200a0208, plog=0x1200d43a8, 
    s=0x1200a6970) at /home/jwm/apache2-2.2.3/server/mpm/prefork/prefork.c:975
#24 0x0000000120022e28 in main (argc=3, argv=0x11fefbcb8)
    at /home/jwm/apache2-2.2.3/server/main.c:717

-- System Information:
Debian Release: 4.0
  APT prefers testing
  APT policy: (500, 'testing'), (500, 'stable')
Architecture: alpha
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-4-alpha-smp
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)

Versions of packages apache2.2-common depends on:
ii  apache2-utils                2.2.3-4     utility programs for webservers
ii  libmagic1                    4.17-5etch1 File type determination library us
ii  lsb-base                     3.1-23.1    Linux Standard Base 3.1 init scrip
ii  mime-support                 3.39-1      MIME files 'mime.types' & 'mailcap
ii  net-tools                    1.60-17     The NET-3 networking toolkit
ii  procps                       1:3.2.7-3   /proc file system utilities

apache2.2-common recommends no packages.

-- no debconf information
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