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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 40372] - SEGV in ap_mpm_pod_check, Line 32 at read(fd, &c, 1);
Date Tue, 12 Sep 2006 22:48:02 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=40372


jgg@dolby.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW




------- Additional Comments From jgg@dolby.com  2006-09-12 22:48 -------
I just rebuilt this on Solaris 10-x86_64 again, and in 64-bit mode again, this 
time with --with-mpm=prefork. It still core dumps with the same php file where 
simple php pages seem to work fine.
However, it now dies in a different location. Here’s the output from dbx, 
ptrace, and pflags. It looks like this might be a libxml issue. I'll try to get 
someone from that project's attention.

####### output from dbx #######
t@null (l@1) program terminated by signal SEGV (Segmentation Fault)
Current function is xmlXPathCacheNewString
 2131               (cache->stringObjs->number != 0))
(dbx) where                                                                  
=>[1] xmlXPathCacheNewString(ctxt = 0xfffffd7fffdfdae0, val = 0x745370 ""), 
line 2131 in "xpath.c"
  [2] xmlXPathCompLiteral(ctxt = 0x7a90d0), line 9889 in "xpath.c"
  [3] xmlXPathCompPrimaryExpr(ctxt = 0x7a90d0), line 10060 in "xpath.c"
  [4] xmlXPathCompFilterExpr(ctxt = 0x7a90d0), line 10084 in "xpath.c"
  [5] xmlXPathCompPathExpr(ctxt = 0x7a90d0), line 10286 in "xpath.c"
  [6] xmlXPathCompUnionExpr(ctxt = 0x7a90d0), line 10316 in "xpath.c"
  [7] xmlXPathCompUnaryExpr(ctxt = 0x7a90d0), line 10356 in "xpath.c"
  [8] xmlXPathCompMultiplicativeExpr(ctxt = 0x7a90d0), line 10381 in "xpath.c"
  [9] xmlXPathCompAdditiveExpr(ctxt = 0x7a90d0), line 10422 in "xpath.c"
  [10] xmlXPathCompRelationalExpr(ctxt = 0x7a90d0), line 10460 in "xpath.c"
  [11] xmlXPathCompEqualityExpr(ctxt = 0x7a90d0), line 10514 in "xpath.c"
  [12] xmlXPathCompAndExpr(ctxt = 0x7a90d0), line 10533 in "xpath.c"
  [13] xmlXPathCompileExpr(ctxt = 0x7a90d0, sort = 1), line 10559 in "xpath.c"
  [14] xmlXPathCtxtCompile(ctxt = 0xfffffd7fffdfdae0, str = 
0x7d6f6e "$BACKGROUND != ''"), line 14113 in "xpath.c"
  [15] xsltXPathCompile(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfffffd7ffdd057f0 
  [16] xsltIfComp(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfffffd7ffdd18561 
  [17] xsltStylePreCompute(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfffffd7ffdd18c7e 
  [18] xsltPrecomputeStylesheet(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 
0xfffffd7ffdd008eb 
  [19] xsltParseStylesheetProcess(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 
0xfffffd7ffdd01de4 
  [20] xsltParseStylesheetImportedDoc(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 
0xfffffd7ffdd02060 
  [21] xsltParseStylesheetDoc(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 
0xfffffd7ffdd020d4 
  [22] zif_xsl_xsltprocessor_import_stylesheet(ht = 1, return_value = 0x74a2b8, 
return_value_ptr = (nil), this_ptr = 0x74a1f8, return_value_used = 1), line 365 
in "xsltprocessor.c"
  [23] zend_do_fcall_common_helper_SPEC(execute_data = 0xfffffd7fffdfe678), 
line 200 in "zend_vm_execute.h"
  [24] ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER(execute_data = 0xfffffd7fffdfe678), 
line 322 in "zend_vm_execute.h"
  [25] execute(op_array = 0x7400b8), line 92 in "zend_vm_execute.h"
  [26] zend_execute_scripts(type = 8, retval = (nil), file_count = 3, ... = 
0x741f90, ...), line 1109 in "zend.c"
  [27] php_execute_script(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfffffd7ffc9f5514 
  [28] php_handler(r = 0x72a228), line 586 in "sapi_apache2.c"
  [29] ap_run_handler(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0x459a51 
  [30] ap_invoke_handler(r = 0x72a228), line 371 in "config.c"
  [31] ap_process_request(r = 0x72a228), line 258 in "http_request.c"
  [32] ap_process_http_connection(c = 0x724098), line 184 in "http_core.c"
  [33] ap_run_process_connection(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0x466351 
  [34] ap_process_connection(c = 0x724098, csd = 0x723da8), line 178 
in "connection.c"
  [35] child_main(child_num_arg = 0), line 640 in "prefork.c"
  [36] make_child(s = 0x4c1b60, slot = 0), line 736 in "prefork.c"
  [37] startup_children(number_to_start = 5), line 754 in "prefork.c"
  [38] ap_mpm_run(_pconf = 0x4bc4f8, plog = 0x4ec678, s = 0x4c1b60), line 975 
in "prefork.c"
  [39] main(argc = 3, argv = 0xfffffd7fffdff318), line 717 in "main.c"

####### output from pstack ########
#>sudo pstack core.httpd.14439 
core 'core.httpd.14439' of 14439:       /usr/local/apache2/bin/httpd -k start
 fffffd7ffd960d9e xmlXPathCacheNewString () + 7e
 fffffd7ffd977e8a xmlXPathCompLiteral () + 56a
 fffffd7ffd978f9e xmlXPathCompPrimaryExpr () + 4ce
 fffffd7ffd9790ca xmlXPathCompFilterExpr () + 1a
 fffffd7ffd979fde xmlXPathCompPathExpr () + 72e
 fffffd7ffd97a34a xmlXPathCompUnionExpr () + 1a
 fffffd7ffd97aa54 xmlXPathCompUnaryExpr () + 2a4
 fffffd7ffd97ab7a xmlXPathCompMultiplicativeExpr () + 1a
 fffffd7ffd97b11a xmlXPathCompAdditiveExpr () + 1a
 fffffd7ffd97b58a xmlXPathCompRelationalExpr () + 1a
 fffffd7ffd97be46 xmlXPathCompEqualityExpr () + 346
 fffffd7ffd97c01a xmlXPathCompAndExpr () + 1a
 fffffd7ffd97c45d xmlXPathCompileExpr () + 1d
 fffffd7ffd9890aa xmlXPathCtxtCompile () + 8a
 fffffd7ffdd057f0 xsltXPathCompile () + 50
 fffffd7ffdd18561 xsltIfComp () + 71
 fffffd7ffdd18c7e xsltStylePreCompute () + 13e
 fffffd7ffdd008eb xsltPrecomputeStylesheet () + eb
 fffffd7ffdd01de4 xsltParseStylesheetProcess () + 54
 fffffd7ffdd02060 xsltParseStylesheetImportedDoc () + b0
 fffffd7ffdd020d4 xsltParseStylesheetDoc () + 14
 fffffd7ffc9e9be8 zif_xsl_xsltprocessor_import_stylesheet () + 1f8
 fffffd7ffcb0764c zend_do_fcall_common_helper_SPEC () + 55c
 fffffd7ffcb07e6a ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER () + 2a
 fffffd7ffcb06fa4 execute () + 344
 fffffd7ffcab32e8 zend_execute_scripts () + 258
 fffffd7ffc9f5514 php_execute_script () + 4d4
 fffffd7ffcb7fec9 php_handler () + 7b9
 0000000000459a51 ap_run_handler () + 81
 000000000045a6c5 ap_invoke_handler () + 1b5
 000000000047113b ap_process_request () + 7b
 000000000046cd3c ap_process_http_connection () + cc
 0000000000466351 ap_run_process_connection () + 81
 000000000046694a ap_process_connection () + 7a
 0000000000479058 child_main () + 5b8
 00000000004792b3 make_child () + 1d3
 0000000000479359 startup_children () + 69
 000000000047991b ap_mpm_run () + 2ab
 0000000000437633 main () + fd3
 000000000043588c ???????? ()

####### output from pflags #######
#>sudo pflags core.httpd.14439 
core 'core.httpd.14439' of 14439:       /usr/local/apache2/bin/httpd -k start
        data model = _LP64  flags = ORPHAN|MSACCT|MSFORK
 /1:    flags = 0
        sigmask = 0xffffbefc,0x0000ffff  cursig = SIGSEGV
#######

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