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From Henri Gomez <henri.go...@gmail.com>
Subject mod_jk 1.2.28 on i5/OS
Date Tue, 12 May 2009 10:43:02 GMT
Hi to all,

I rebuild the mod_jk 1.2.28 on our i5/OS and Apache instance failed.

Here is the stack trace :

00000009:259448 Stack:  Library    / Program     Module      Stmt
Procedure
00000009:259488 Stack:  QSYS       / QCMD                    455   :
00000009:259520 Stack:  QHTTPSVR   / QZHBMAIN    ZHBMAIN     0     :
_CXX_PEP__Fv
00000009:259552 Stack:  QHTTPSVR   / QZHBMAIN    ZHBMAIN     18    :
main
00000009:259576 Stack:  QHTTPSVR   / QZHBMAIN    ZHBMAIN     234   :
BigSwitch__FiPPc
00000009:259608 Stack:  QHTTPSVR   / QZSRHTTP    QZSRMAIN    0     :
_CXX_PEP__Fv
00000009:259640 Stack:  QHTTPSVR   / QZSRHTTP    QZSRMAIN    2     :
main
00000009:267440 Stack:  QHTTPSVR   / QZSRCORE    MAIN        868   :
apache_main
00000009:287992 Stack:  QHTTPSVR   / QZSRCORE    HTTP_CONFI  5     :
ap_run_post_config
00000009:288288 Stack:  QHTTPSVR   / MOD_JK1228  MOD_JK      60    :
jk_post_config
00000009:288320 Stack:  QHTTPSVR   / MOD_JK1228  MOD_JK      35    :
init_jk
00000009:288688 Stack:  QHTTPSVR   / MOD_JK1228  JK_WORKER   34    :
wc_open
00000009:288720 Stack:  QHTTPSVR   / MOD_JK1228  JK_WORKER   9     :
build_worker_map
00000009:296848 Stack:  QHTTPSVR   / MOD_JK1228  JK_WORKER   28    :
wc_create_worker
00000009:298192 Stack:  QHTTPSVR   / MOD_JK1228  JK_AJP13_W  5     :
validate
00000009:298208 Stack:  QHTTPSVR   / MOD_JK1228  JK_AJP_COM  29    :
ajp_validate
00000009:298216 Stack:  QHTTPSVR   / MOD_JK1228  JK_CONNECT  19    :
jk_resolve
00000009:316840 Stack:  QHTTPSVR   / QZSRAPR     APR_POOLS   13    :
apr_pool_clear
00000009:316864 Stack:  QHTTPSVR   / QZSRAPR     APR_POOLS   8     :
allocator_free
00000009:316880 Stack:  QHTTPSVR   / QZSRCORE    MAIN        18    :
Main_Excp_Handler
00000009:316888 Stack:  QHTTPSVR   / QZSRAPR     OS400TRACE  7     :
apr_dstack_CCSID
00000009:326912 Stack:  QSYS       / QP0ZCPA     QP0ZUDBG    3     :
Qp0zDumpStack
00000009:346808 Stack:  QSYS       / QP0ZSCPA    QP0ZSDBG    2     :
Qp0zSUDumpStack
00000009:346824 Stack:  QSYS       / QP0ZSCPA    QP0ZSDBG    12    :
Qp0zSUDumpTargetStack
00000009:346824 Stack:  Completed
00000009:407280 apr_dump_trace(): dump for job
678302/QTMHHTTP/DAPSERVER
                                                 TRCTCPAPP Output

The problem appears in jk_resolve just after apr_pool_create.

What happen if 2 threads goes in jk_resolve at the same time ?

        if (!jk_apr_pool) {
            if (apr_pool_create(&jk_apr_pool, (apr_pool_t *)pool) !=
APR_SUCCESS) {
                JK_TRACE_EXIT(l);
                return JK_FALSE;
            }
        }
        apr_pool_clear(jk_apr_pool);
        if (apr_sockaddr_info_get
            (&remote_sa, host, APR_UNSPEC, (apr_port_t) port, 0, jk_apr_pool)
            != APR_SUCCESS) {
            JK_TRACE_EXIT(l);
            return JK_FALSE;
        }

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