/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/mysql_adapter.rb:319: [BUG] Segmentation fault
ruby 1.9.1p243 (2009-07-16 revision 24175) [i686-linux]

-- control frame ----------
c:0110 p:---- s:0490 b:0490 l:000489 d:000489 CFUNC  :query
c:0109 p:0013 s:0486 b:0486 l:001ed0 d:000485 BLOCK  /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/mysql_adapter.rb:319
c:0108 p:0005 s:0484 b:0484 l:000cdc d:000483 BLOCK  /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract_adapter.rb:204
c:0107 p:0005 s:0482 b:0482 l:000c04 d:000481 BLOCK  /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-2.3.4/lib/active_support/core_ext/benchmark.rb:17
c:0106 p:0024 s:0480 b:0480 l:000479 d:000479 METHOD /usr/local/lib/ruby/1.9.1/benchmark.rb:309
c:0105 p:0013 s:0474 b:0473 l:000c04 d:000c04 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-2.3.4/lib/active_support/core_ext/benchmark.rb:17
c:0104 p:0033 s:0470 b:0470 l:000cdc d:000cdc METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract_adapter.rb:204
c:0103 p:0018 s:0461 b:0461 l:001ed0 d:001ed0 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/mysql_adapter.rb:319
c:0102 p:0031 s:0455 b:0455 l:000454 d:000454 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/mysql_adapter.rb:604
c:0101 p:0018 s:0448 b:0448 l:000447 d:000447 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract/database_statements.rb:7
c:0100 p:0012 s:0443 b:0443 l:000432 d:000442 BLOCK  /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract/query_cache.rb:60
c:0099 p:0051 s:0441 b:0438 l:000437 d:000437 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract/query_cache.rb:81
c:0098 p:0025 s:0433 b:0433 l:000432 d:000432 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract/query_cache.rb:60
c:0097 p:0040 s:0429 b:0429 l:000428 d:000428 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/base.rb:661
c:0096 p:0085 s:0425 b:0425 l:000424 d:000424 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/base.rb:1548
c:0095 p:0144 s:0419 b:0419 l:000418 d:000418 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/base.rb:615
c:0094 p:0370 s:0414 b:0414 l:000413 d:000413 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_collection.rb:60
c:0093 p:0048 s:0403 b:0403 l:000402 d:000402 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_collection.rb:400
c:0092 p:0101 s:0399 b:0399 l:000398 d:000398 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_collection.rb:354
c:0091 p:0011 s:0396 b:0396 l:000395 d:000395 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_collection.rb:288
c:0090 p:0104 s:0393 b:0392 l:0020e8 d:000391 BLOCK  /deployment/pangea/releases/20091027192005/lib/deployer.rb:327
c:0089 p:---- s:0389 b:0389 l:000388 d:000388 FINISH
c:0088 p:---- s:0387 b:0387 l:000386 d:000386 CFUNC  :each
c:0087 p:0025 s:0384 b:0384 l:0020e8 d:000383 BLOCK  /deployment/pangea/releases/20091027192005/lib/deployer.rb:322
c:0086 p:---- s:0380 b:0380 l:000379 d:000379 FINISH
c:0085 p:---- s:0378 b:0378 l:000377 d:000377 CFUNC  :call
c:0084 p:0022 s:0374 b:0374 l:000373 d:000373 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:134
c:0083 p:0150 s:0370 b:0370 l:000369 d:000369 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:58
c:0082 p:---- s:0362 b:0362 l:000361 d:000361 FINISH
c:0081 p:0047 s:0360 b:0360 l:0020e8 d:001f94 BLOCK  /deployment/pangea/releases/20091027192005/lib/deployer.rb:320
c:0080 p:---- s:0358 b:0358 l:000357 d:000357 FINISH
c:0079 p:---- s:0356 b:0356 l:000355 d:000355 CFUNC  :call
c:0078 p:0022 s:0352 b:0352 l:000351 d:000351 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:134
c:0077 p:0150 s:0348 b:0348 l:000347 d:000347 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:58
c:0076 p:---- s:0340 b:0340 l:000339 d:000339 FINISH
c:0075 p:0251 s:0338 b:0338 l:0020e8 d:000550 BLOCK  /deployment/pangea/releases/20091027192005/lib/deployer.rb:262
c:0074 p:---- s:0335 b:0335 l:000334 d:000334 FINISH
c:0073 p:---- s:0333 b:0333 l:000332 d:000332 CFUNC  :each
c:0072 p:0035 s:0330 b:0330 l:0020e8 d:00059c BLOCK  /deployment/pangea/releases/20091027192005/lib/deployer.rb:257
c:0071 p:---- s:0326 b:0326 l:000325 d:000325 FINISH
c:0070 p:---- s:0324 b:0324 l:000323 d:000323 CFUNC  :call
c:0069 p:0022 s:0320 b:0320 l:000319 d:000319 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:134
c:0068 p:0150 s:0316 b:0316 l:000315 d:000315 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:58
c:0067 p:---- s:0308 b:0308 l:000307 d:000307 FINISH
c:0066 p:0023 s:0306 b:0306 l:0020e8 d:001f74 BLOCK  /deployment/pangea/releases/20091027192005/lib/deployer.rb:255
c:0065 p:---- s:0304 b:0304 l:000303 d:000303 FINISH
c:0064 p:---- s:0302 b:0302 l:000301 d:000301 CFUNC  :call
c:0063 p:0022 s:0298 b:0298 l:000297 d:000297 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:134
c:0062 p:0150 s:0294 b:0294 l:000293 d:000293 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:58
c:0061 p:---- s:0286 b:0286 l:000285 d:000285 FINISH
c:0060 p:0247 s:0284 b:0284 l:0020e8 d:0020e8 METHOD /deployment/pangea/releases/20091027192005/lib/deployer.rb:235
c:0059 p:0013 s:0278 b:0278 l:000277 d:000277 METHOD /deployment/pangea/releases/20091027192005/lib/deployer.rb:158
c:0058 p:0015 s:0269 b:0269 l:000268 d:000268 METHOD /deployment/pangea/releases/20091027192005/lib/deployer.rb:148
c:0057 p:0015 s:0264 b:0264 l:000236 d:000263 BLOCK  /deployment/pangea/releases/20091027192005/lib/deployer.rb:118
c:0056 p:0008 s:0261 b:0261 l:000243 d:000260 BLOCK  /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_collection.rb:369
c:0055 p:0008 s:0258 b:0258 l:000249 d:000257 BLOCK  /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_proxy.rb:219
c:0054 p:---- s:0255 b:0255 l:000254 d:000254 FINISH
c:0053 p:---- s:0253 b:0253 l:000252 d:000252 CFUNC  :each
c:0052 p:0110 s:0250 b:0250 l:000249 d:000249 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_proxy.rb:219
c:0051 p:0076 s:0244 b:0244 l:000243 d:000243 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_collection.rb:369
c:0050 p:---- s:0239 b:0239 l:000238 d:000238 FINISH
c:0049 p:0076 s:0237 b:0237 l:000236 d:000236 METHOD /deployment/pangea/releases/20091027192005/lib/deployer.rb:117
c:0048 p:0052 s:0230 b:0230 l:000229 d:000229 METHOD /deployment/pangea/releases/20091027192005/app/controllers/lessons_controller.rb:282
c:0047 p:0042 s:0225 b:0225 l:000224 d:000224 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/base.rb:1331
c:0046 p:0047 s:0221 b:0221 l:000220 d:000220 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/filters.rb:617
c:0045 p:0028 s:0214 b:0214 l:000213 d:000213 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/filters.rb:610
c:0044 p:0009 s:0211 b:0211 l:000eb4 d:000210 BLOCK  /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/benchmarking.rb:68
c:0043 p:0005 s:0209 b:0209 l:0008dc d:000208 BLOCK  /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-2.3.4/lib/active_support/core_ext/benchmark.rb:17
c:0042 p:0024 s:0207 b:0207 l:000206 d:000206 METHOD /usr/local/lib/ruby/1.9.1/benchmark.rb:309
c:0041 p:0013 s:0201 b:0200 l:0008dc d:0008dc METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-2.3.4/lib/active_support/core_ext/benchmark.rb:17
c:0040 p:0028 s:0197 b:0197 l:000eb4 d:000eb4 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/benchmarking.rb:68
c:0039 p:0011 s:0190 b:0190 l:000189 d:000189 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/rescue.rb:160
c:0038 p:0011 s:0186 b:0186 l:000185 d:000185 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/flash.rb:146
c:0037 p:0088 s:0183 b:0183 l:000182 d:000182 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/base.rb:532
c:0036 p:0029 s:0176 b:0176 l:000175 d:000175 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/filters.rb:606
c:0035 p:0021 s:0169 b:0169 l:000168 d:000168 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/base.rb:391
c:0034 p:0097 s:0164 b:0164 l:000163 d:000163 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/base.rb:386
c:0033 p:0054 s:0158 b:0158 l:000157 d:000157 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/routing/route_set.rb:437
c:0032 p:0035 s:0152 b:0152 l:000151 d:000151 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/dispatcher.rb:87
c:0031 p:0017 s:0147 b:0147 l:000146 d:000146 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/dispatcher.rb:121
c:0030 p:0018 s:0143 b:0143 l:000e3c d:000142 LAMBDA /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/dispatcher.rb:130
c:0029 p:---- s:0140 b:0140 l:000139 d:000139 FINISH
c:0028 p:---- s:0138 b:0138 l:000137 d:000137 CFUNC  :call
c:0027 p:0013 s:0134 b:0134 l:000220 d:000133 BLOCK  /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/query_cache.rb:29
c:0026 p:0038 s:0132 b:0132 l:000131 d:000131 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract/query_cache.rb:34
c:0025 p:0051 s:0128 b:0128 l:000127 d:000127 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/query_cache.rb:9
c:0024 p:0019 s:0124 b:0124 l:000220 d:000220 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/query_cache.rb:28
c:0023 p:0014 s:0120 b:0120 l:000119 d:000119 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:361
c:0022 p:0014 s:0116 b:0116 l:000115 d:000115 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.0.1/lib/rack/head.rb:9
c:0021 p:0150 s:0109 b:0109 l:000108 d:000108 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.0.1/lib/rack/methodoverride.rb:24
c:0020 p:0045 s:0103 b:0103 l:000102 d:000102 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/params_parser.rb:15
c:0019 p:0076 s:0098 b:0098 l:000097 d:000097 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/session/cookie_store.rb:93
c:0018 p:0014 s:0088 b:0088 l:000087 d:000087 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/failsafe.rb:26
c:0017 p:0013 s:0083 b:0083 l:000077 d:000082 BLOCK  /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.0.1/lib/rack/lock.rb:11
c:0016 p:0019 s:0081 b:0081 l:000080 d:000080 METHOD <internal:prelude>:8
c:0015 p:0052 s:0078 b:0078 l:000077 d:000077 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.0.1/lib/rack/lock.rb:11
c:0014 p:0020 s:0073 b:0073 l:000072 d:000072 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/dispatcher.rb:106
c:0013 p:0278 s:0069 b:0069 l:000068 d:000068 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/cgi_process.rb:44
c:0012 p:0022 s:0059 b:0059 l:000058 d:000058 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/dispatcher.rb:101
c:0011 p:0041 s:0054 b:0054 l:000053 d:000053 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/dispatcher.rb:27
c:0010 p:0063 s:0048 b:0048 l:000042 d:000047 BLOCK  /usr/local/lib/ruby/gems/1.9.1/gems/mongrel-1.1.6/lib/mongrel/rails.rb:76
c:0009 p:0019 s:0046 b:0046 l:000045 d:000045 METHOD <internal:prelude>:8
c:0008 p:0335 s:0043 b:0043 l:000042 d:000042 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/mongrel-1.1.6/lib/mongrel/rails.rb:74
c:0007 p:0017 s:0032 b:0032 l:000023 d:000031 BLOCK  /usr/local/lib/ruby/gems/1.9.1/gems/mongrel-1.1.6/lib/mongrel.rb:165
c:0006 p:---- s:0029 b:0029 l:000028 d:000028 FINISH
c:0005 p:---- s:0027 b:0027 l:000026 d:000026 CFUNC  :each
c:0004 p:0410 s:0024 b:0024 l:000023 d:000023 METHOD /usr/local/lib/ruby/gems/1.9.1/gems/mongrel-1.1.6/lib/mongrel.rb:164
c:0003 p:0012 s:0007 b:0007 l:0016dc d:000006 BLOCK  /usr/local/lib/ruby/gems/1.9.1/gems/mongrel-1.1.6/lib/mongrel.rb:291
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:---- s:0002 b:0002 l:000001 d:000001 TOP   
---------------------------
-- Ruby level backtrace information-----------------------------------------
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/mysql_adapter.rb:319:in `query'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/mysql_adapter.rb:319:in `block in execute'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract_adapter.rb:204:in `block in log'
/usr/local/lib/ruby/gems/1.9.1/gems/activesupport-2.3.4/lib/active_support/core_ext/benchmark.rb:17:in `block in ms'
/usr/local/lib/ruby/1.9.1/benchmark.rb:309:in `realtime'
/usr/local/lib/ruby/gems/1.9.1/gems/activesupport-2.3.4/lib/active_support/core_ext/benchmark.rb:17:in `ms'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract_adapter.rb:204:in `log'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/mysql_adapter.rb:319:in `execute'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/mysql_adapter.rb:604:in `select'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract/database_statements.rb:7:in `select_all'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract/query_cache.rb:60:in `block in select_all_with_query_cache'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract/query_cache.rb:81:in `cache_sql'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract/query_cache.rb:60:in `select_all_with_query_cache'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/base.rb:661:in `find_by_sql'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/base.rb:1548:in `find_every'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/base.rb:615:in `find'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_collection.rb:60:in `find'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_collection.rb:400:in `find_target'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_collection.rb:354:in `load_target'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_collection.rb:288:in `length'
/deployment/pangea/releases/20091027192005/lib/deployer.rb:327:in `block (6 levels) in get_learning_object_xml'
/deployment/pangea/releases/20091027192005/lib/deployer.rb:322:in `each'
/deployment/pangea/releases/20091027192005/lib/deployer.rb:322:in `block (5 levels) in get_learning_object_xml'
/usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:134:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:134:in `_nested_structures'
/usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:58:in `method_missing'
/deployment/pangea/releases/20091027192005/lib/deployer.rb:320:in `block (4 levels) in get_learning_object_xml'
/usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:134:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:134:in `_nested_structures'
/usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:58:in `method_missing'
/deployment/pangea/releases/20091027192005/lib/deployer.rb:262:in `block (3 levels) in get_learning_object_xml'
/deployment/pangea/releases/20091027192005/lib/deployer.rb:257:in `each'
/deployment/pangea/releases/20091027192005/lib/deployer.rb:257:in `block (2 levels) in get_learning_object_xml'
/usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:134:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:134:in `_nested_structures'
/usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:58:in `method_missing'
/deployment/pangea/releases/20091027192005/lib/deployer.rb:255:in `block in get_learning_object_xml'
/usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:134:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:134:in `_nested_structures'
/usr/local/lib/ruby/gems/1.9.1/gems/builder-2.1.2/lib/builder/xmlbase.rb:58:in `method_missing'
/deployment/pangea/releases/20091027192005/lib/deployer.rb:235:in `get_learning_object_xml'
/deployment/pangea/releases/20091027192005/lib/deployer.rb:158:in `deploy_learning_object_xml'
/deployment/pangea/releases/20091027192005/lib/deployer.rb:148:in `deploy_learning_object'
/deployment/pangea/releases/20091027192005/lib/deployer.rb:118:in `block in deploy_lesson'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_collection.rb:369:in `block in method_missing'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_proxy.rb:219:in `block in method_missing'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_proxy.rb:219:in `each'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_proxy.rb:219:in `method_missing'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/associations/association_collection.rb:369:in `method_missing'
/deployment/pangea/releases/20091027192005/lib/deployer.rb:117:in `deploy_lesson'
/deployment/pangea/releases/20091027192005/app/controllers/lessons_controller.rb:282:in `deploy'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/base.rb:1331:in `perform_action'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/filters.rb:617:in `call_filters'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/filters.rb:610:in `perform_action_with_filters'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/benchmarking.rb:68:in `block in perform_action_with_benchmark'
/usr/local/lib/ruby/gems/1.9.1/gems/activesupport-2.3.4/lib/active_support/core_ext/benchmark.rb:17:in `block in ms'
/usr/local/lib/ruby/1.9.1/benchmark.rb:309:in `realtime'
/usr/local/lib/ruby/gems/1.9.1/gems/activesupport-2.3.4/lib/active_support/core_ext/benchmark.rb:17:in `ms'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/benchmarking.rb:68:in `perform_action_with_benchmark'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/rescue.rb:160:in `perform_action_with_rescue'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/flash.rb:146:in `perform_action_with_flash'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/base.rb:532:in `process'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/filters.rb:606:in `process_with_filters'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/base.rb:391:in `process'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/base.rb:386:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/routing/route_set.rb:437:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/dispatcher.rb:87:in `dispatch'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/dispatcher.rb:121:in `_call'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/dispatcher.rb:130:in `block in build_middleware_stack'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/query_cache.rb:29:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/query_cache.rb:29:in `block in call'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/query_cache.rb:9:in `cache'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/query_cache.rb:28:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.0.1/lib/rack/head.rb:9:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.0.1/lib/rack/methodoverride.rb:24:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/params_parser.rb:15:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/session/cookie_store.rb:93:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/failsafe.rb:26:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.0.1/lib/rack/lock.rb:11:in `block in call'
<internal:prelude>:8:in `synchronize'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.0.1/lib/rack/lock.rb:11:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/dispatcher.rb:106:in `call'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/cgi_process.rb:44:in `dispatch_cgi'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/dispatcher.rb:101:in `dispatch_cgi'
/usr/local/lib/ruby/gems/1.9.1/gems/actionpack-2.3.4/lib/action_controller/dispatcher.rb:27:in `dispatch'
/usr/local/lib/ruby/gems/1.9.1/gems/mongrel-1.1.6/lib/mongrel/rails.rb:76:in `block in process'
<internal:prelude>:8:in `synchronize'
/usr/local/lib/ruby/gems/1.9.1/gems/mongrel-1.1.6/lib/mongrel/rails.rb:74:in `process'
/usr/local/lib/ruby/gems/1.9.1/gems/mongrel-1.1.6/lib/mongrel.rb:165:in `block in process_client'
/usr/local/lib/ruby/gems/1.9.1/gems/mongrel-1.1.6/lib/mongrel.rb:164:in `each'
/usr/local/lib/ruby/gems/1.9.1/gems/mongrel-1.1.6/lib/mongrel.rb:164:in `process_client'
/usr/local/lib/ruby/gems/1.9.1/gems/mongrel-1.1.6/lib/mongrel.rb:291:in `block (2 levels) in run'

-- C level backtrace information -------------------------------------------
0x6d4ec8 /usr/local/lib/libruby.so.1.9(rb_vm_bugreport+0x48) [0x6d4ec8]
0x608478 /usr/local/lib/libruby.so.1.9 [0x608478]
0x6084fb /usr/local/lib/libruby.so.1.9(rb_bug+0x2b) [0x6084fb]
0x6868e6 /usr/local/lib/libruby.so.1.9 [0x6868e6]
0xf8c440 [0xf8c440]
0x1a391d /lib/i686/nosegneg/libc.so.6 [0x1a391d]
0x1a5772 /lib/i686/nosegneg/libc.so.6(__libc_malloc+0x82) [0x1a5772]
0xfc8bfd /usr/lib/mysql/libmysqlclient.so.15(my_malloc+0x2d) [0xfc8bfd]
0xfcbd7a /usr/lib/mysql/libmysqlclient.so.15(alloc_root+0x7a) [0xfcbd7a]
0xfeeaf0 /usr/lib/mysql/libmysqlclient.so.15(cli_read_rows+0xd0) [0xfeeaf0]
0xfeee21 /usr/lib/mysql/libmysqlclient.so.15 [0xfeee21]
0xfed214 /usr/lib/mysql/libmysqlclient.so.15(mysql_real_query+0x44) [0xfed214]
0xd7d886 /usr/local/lib/ruby/gems/1.9.1/gems/mysql-2.8.1/lib/mysql_api.so [0xd7d886]
0x6c7657 /usr/local/lib/libruby.so.1.9 [0x6c7657]
0x6c84c4 /usr/local/lib/libruby.so.1.9 [0x6c84c4]
0x6caab4 /usr/local/lib/libruby.so.1.9 [0x6caab4]
0x6cece3 /usr/local/lib/libruby.so.1.9 [0x6cece3]
0x6cf206 /usr/local/lib/libruby.so.1.9 [0x6cf206]
0x6cfb27 /usr/local/lib/libruby.so.1.9(rb_yield+0x47) [0x6cfb27]
0x5e669a /usr/local/lib/libruby.so.1.9(rb_ary_each+0x3a) [0x5e669a]
0x6c7657 /usr/local/lib/libruby.so.1.9 [0x6c7657]
0x6c84c4 /usr/local/lib/libruby.so.1.9 [0x6c84c4]
0x6caab4 /usr/local/lib/libruby.so.1.9 [0x6caab4]
0x6cece3 /usr/local/lib/libruby.so.1.9 [0x6cece3]
0x6cf206 /usr/local/lib/libruby.so.1.9 [0x6cf206]
0x6cf6a1 /usr/local/lib/libruby.so.1.9(rb_vm_invoke_proc+0x81) [0x6cf6a1]
0x60e474 /usr/local/lib/libruby.so.1.9 [0x60e474]
0x6c6076 /usr/local/lib/libruby.so.1.9 [0x6c6076]
0x6c7657 /usr/local/lib/libruby.so.1.9 [0x6c7657]
0x6c84c4 /usr/local/lib/libruby.so.1.9 [0x6c84c4]
0x6caab4 /usr/local/lib/libruby.so.1.9 [0x6caab4]
0x6cece3 /usr/local/lib/libruby.so.1.9 [0x6cece3]
0x6d0d7a /usr/local/lib/libruby.so.1.9 [0x6d0d7a]
0x6c7efa /usr/local/lib/libruby.so.1.9(rb_funcall2+0x10a) [0x6c7efa]
0x6c81c9 /usr/local/lib/libruby.so.1.9 [0x6c81c9]
0x6c845b /usr/local/lib/libruby.so.1.9 [0x6c845b]
0x6caab4 /usr/local/lib/libruby.so.1.9 [0x6caab4]
0x6cece3 /usr/local/lib/libruby.so.1.9 [0x6cece3]
0x6cf206 /usr/local/lib/libruby.so.1.9 [0x6cf206]
0x6cf6a1 /usr/local/lib/libruby.so.1.9(rb_vm_invoke_proc+0x81) [0x6cf6a1]
0x60e474 /usr/local/lib/libruby.so.1.9 [0x60e474]
0x6c6076 /usr/local/lib/libruby.so.1.9 [0x6c6076]
0x6c7657 /usr/local/lib/libruby.so.1.9 [0x6c7657]
0x6c84c4 /usr/local/lib/libruby.so.1.9 [0x6c84c4]
0x6caab4 /usr/local/lib/libruby.so.1.9 [0x6caab4]
0x6cece3 /usr/local/lib/libruby.so.1.9 [0x6cece3]
0x6d0d7a /usr/local/lib/libruby.so.1.9 [0x6d0d7a]
0x6c7efa /usr/local/lib/libruby.so.1.9(rb_funcall2+0x10a) [0x6c7efa]
0x6c81c9 /usr/local/lib/libruby.so.1.9 [0x6c81c9]
0x6c845b /usr/local/lib/libruby.so.1.9 [0x6c845b]
0x6caab4 /usr/local/lib/libruby.so.1.9 [0x6caab4]
0x6cece3 /usr/local/lib/libruby.so.1.9 [0x6cece3]
0x6cf206 /usr/local/lib/libruby.so.1.9 [0x6cf206]
0x6cfb27 /usr/local/lib/libruby.so.1.9(rb_yield+0x47) [0x6cfb27]
0x5e669a /usr/local/lib/libruby.so.1.9(rb_ary_each+0x3a) [0x5e669a]
0x6c7657 /usr/local/lib/libruby.so.1.9 [0x6c7657]
0x6c84c4 /usr/local/lib/libruby.so.1.9 [0x6c84c4]
0x6caab4 /usr/local/lib/libruby.so.1.9 [0x6caab4]
0x6cece3 /usr/local/lib/libruby.so.1.9 [0x6cece3]
0x6cf206 /usr/local/lib/libruby.so.1.9 [0x6cf206]
0x6cf6a1 /usr/local/lib/libruby.so.1.9(rb_vm_invoke_proc+0x81) [0x6cf6a1]
0x60e474 /usr/local/lib/libruby.so.1.9 [0x60e474]
0x6c6076 /usr/local/lib/libruby.so.1.9 [0x6c6076]
0x6c7657 /usr/local/lib/libruby.so.1.9 [0x6c7657]
0x6c84c4 /usr/local/lib/libruby.so.1.9 [0x6c84c4]
0x6caab4 /usr/local/lib/libruby.so.1.9 [0x6caab4]
0x6cece3 /usr/local/lib/libruby.so.1.9 [0x6cece3]
0x6d0d7a /usr/local/lib/libruby.so.1.9 [0x6d0d7a]
0x6c7efa /usr/local/lib/libruby.so.1.9(rb_funcall2+0x10a) [0x6c7efa]
0x6c81c9 /usr/local/lib/libruby.so.1.9 [0x6c81c9]
0x6c845b /usr/local/lib/libruby.so.1.9 [0x6c845b]
0x6caab4 /usr/local/lib/libruby.so.1.9 [0x6caab4]
0x6cece3 /usr/local/lib/libruby.so.1.9 [0x6cece3]
0x6cf206 /usr/local/lib/libruby.so.1.9 [0x6cf206]
0x6cf6a1 /usr/local/lib/libruby.so.1.9(rb_vm_invoke_proc+0x81) [0x6cf6a1]
0x60e474 /usr/local/lib/libruby.so.1.9 [0x60e474]
0x6c6076 /usr/local/lib/libruby.so.1.9 [0x6c6076]
0x6c7657 /usr/local/lib/libruby.so.1.9 [0x6c7657]
0x6c84c4 /usr/local/lib/libruby.so.1.9 [0x6c84c4]
0x6caab4 /usr/local/lib/libruby.so.1.9 [0x6caab4]
0x6cece3 /usr/local/lib/libruby.so.1.9 [0x6cece3]
0x6d0d7a /usr/local/lib/libruby.so.1.9 [0x6d0d7a]
0x6c7efa /usr/local/lib/libruby.so.1.9(rb_funcall2+0x10a) [0x6c7efa]
0x6c81c9 /usr/local/lib/libruby.so.1.9 [0x6c81c9]
0x6c845b /usr/local/lib/libruby.so.1.9 [0x6c845b]
0x6caab4 /usr/local/lib/libruby.so.1.9 [0x6caab4]
0x6cece3 /usr/local/lib/libruby.so.1.9 [0x6cece3]
0x6cf206 /usr/local/lib/libruby.so.1.9 [0x6cf206]
0x6cfb27 /usr/local/lib/libruby.so.1.9(rb_yield+0x47) [0x6cfb27]
0x5e669a /usr/local/lib/libruby.so.1.9(rb_ary_each+0x3a) [0x5e669a]
0x6c7657 /usr/local/lib/libruby.so.1.9 [0x6c7657]
0x6c84c4 /usr/local/lib/libruby.so.1.9 [0x6c84c4]
0x6caab4 /usr/local/lib/libruby.so.1.9 [0x6caab4]
0x6cece3 /usr/local/lib/libruby.so.1.9 [0x6cece3]
0x6d0d7a /usr/local/lib/libruby.so.1.9 [0x6d0d7a]
0x6c7efa /usr/local/lib/libruby.so.1.9(rb_funcall2+0x10a) [0x6c7efa]
0x6c81c9 /usr/local/lib/libruby.so.1.9 [0x6c81c9]
0x6c845b /usr/local/lib/libruby.so.1.9 [0x6c845b]
0x6caab4 /usr/local/lib/libruby.so.1.9 [0x6caab4]
0x6cece3 /usr/local/lib/libruby.so.1.9 [0x6cece3]
0x6cf206 /usr/local/lib/libruby.so.1.9 [0x6cf206]
0x6cf6a1 /usr/local/lib/libruby.so.1.9(rb_vm_invoke_proc+0x81) [0x6cf6a1]
0x60e474 /usr/local/lib/libruby.so.1.9 [0x60e474]
0x6c6076 /usr/local/lib/libruby.so.1.9 [0x6c6076]
0x6c7657 /usr/local/lib/libruby.so.1.9 [0x6c7657]
0x6c84c4 /usr/local/lib/libruby.so.1.9 [0x6c84c4]
0x6caab4 /usr/local/lib/libruby.so.1.9 [0x6caab4]
0x6cece3 /usr/local/lib/libruby.so.1.9 [0x6cece3]
0x6cf206 /usr/local/lib/libruby.so.1.9 [0x6cf206]
0x6cfb27 /usr/local/lib/libruby.so.1.9(rb_yield+0x47) [0x6cfb27]
0x5e669a /usr/local/lib/libruby.so.1.9(rb_ary_each+0x3a) [0x5e669a]
0x6c7657 /usr/local/lib/libruby.so.1.9 [0x6c7657]
0x6c84c4 /usr/local/lib/libruby.so.1.9 [0x6c84c4]
0x6caab4 /usr/local/lib/libruby.so.1.9 [0x6caab4]
0x6cece3 /usr/local/lib/libruby.so.1.9 [0x6cece3]
0x6cf206 /usr/local/lib/libruby.so.1.9 [0x6cf206]
0x6cf6a1 /usr/local/lib/libruby.so.1.9(rb_vm_invoke_proc+0x81) [0x6cf6a1]
0x6d8867 /usr/local/lib/libruby.so.1.9 [0x6d8867]
0x6d8991 /usr/local/lib/libruby.so.1.9 [0x6d8991]
0xd1a542 /lib/i686/nosegneg/libpthread.so.0 [0xd1a542]
0x20eb6e /lib/i686/nosegneg/libc.so.6(clone+0x5e) [0x20eb6e]

[NOTE]
You may encounter a bug of Ruby interpreter. Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html