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  1. WiredTiger
  2. WT-2402

Misaligned structure accesses lead to undefined behavior

    Details

    • # Replies:
      25
    • Last comment by Customer:
      true
    • Sprint:
      Storage 2016-12-12, Storage 2017-01-23

      Description

      Running the MongoDB core JS tests under undefined behavior sanitizer leads to many errors of the following form:

      [MongoDFixture:job0] src/third_party/wiredtiger/src/session/session_api.c:1405:21: runtime error: member access within misaligned address 0x7f8331082010 for type 'WT_SESSION_IMPL' (aka 'struct __wt_session_impl'), which requires 64 byte alignment
      [MongoDFixture:job0] 0x7f8331082010: note: pointer points here
      [MongoDFixture:job0]  00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00
      [MongoDFixture:job0]               ^
      [MongoDFixture:job0]     #0 0x2901369 in __open_session /home/andrew/Documents/10gen/dev/src/mongodb/src/third_party/wiredtiger/src/session/session_api.c:1405:8
      [MongoDFixture:job0]     #1 0x2901369 in __wt_open_session /home/andrew/Documents/10gen/dev/src/mongodb/src/third_party/wiredtiger/src/session/session_api.c:1514
      [MongoDFixture:job0]     #2 0x29015f1 in __wt_open_internal_session /home/andrew/Documents/10gen/dev/src/mongodb/src/third_party/wiredtiger/src/session/session_api.c:1552:2
      [MongoDFixture:job0]     #3 0x284463e in __wt_connection_open /home/andrew/Documents/10gen/dev/src/mongodb/src/third_party/wiredtiger/src/conn/conn_open.c:40:2
      [MongoDFixture:job0]     #4 0x2831943 in wiredtiger_open /home/andrew/Documents/10gen/dev/src/mongodb/src/third_party/wiredtiger/src/conn/conn_api.c:2019:2
      [MongoDFixture:job0]     #5 0x1ac3702 in mongo::WiredTigerKVEngine::WiredTigerKVEngine(std::string const&, std::string const&, std::string const&, unsigned long, bool, bool, bool) /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp:239:15
      [MongoDFixture:job0]     #6 0x1ac22f4 in mongo::(anonymous namespace)::WiredTigerFactory::create(mongo::StorageGlobalParams const&, mongo::StorageEngineLockFile const&) const /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/db/storage/wiredtiger/wiredtiger_init.cpp:79:34
      [MongoDFixture:job0]     #7 0x196f7b9 in mongo::ServiceContextMongoD::initializeGlobalStorageEngine() /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/db/service_context_d.cpp:160:22
      [MongoDFixture:job0]     #8 0x1004412 in mongo::_initAndListen(int) /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/db/db.cpp:481:5
      [MongoDFixture:job0]     #9 0x100380a in mongo::initAndListen(int) /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/db/db.cpp:668:9
      [MongoDFixture:job0]     #10 0x1007b3f in mongoDbMain(int, char**, char**) /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/db/db.cpp:893:25
      [MongoDFixture:job0]     #11 0x1007b3f in main /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/db/db.cpp:713
      [MongoDFixture:job0] Waiting to connect to mongod on port 20000.
      [MongoDFixture:job0]     #12 0x7f8332b16a3f in __libc_start_main /build/buildd/glibc-2.21/csu/libc-start.c:289
      [MongoDFixture:job0]     #13 0xfeb3c8 in _start (/home/andrew/Documents/10gen/dev/src/mongodb/mongod+0xfeb3c8)
      [MongoDFixture:job0]
      

      This is not the only error, there are many others, but they are generally of this form, where a structure member is read out of a structure that is not aligned.

      This is undefined behavior unless the member is copied to/from an aligned temporary with memcpy. On architectures where unaligned access is legal, the memcpy will be elided.

        Issue Links

          Activity

          Hide
          xgen-internal-githook Githook User added a comment -

          Author:

          {u'username': u'daveh86', u'name': u'David Hows', u'email': u'howsdav@gmail.com'}

          Message: Import wiredtiger: d48181f6f4db08761ed7b80b0332908b272ad0d0 from branch mongodb-3.2

          ref: 040e3d6f76..d48181f6f4
          for: 3.2.12

          SERVER-26545 Remove fixed-size limitation on WiredTiger hazard pointers
          WT-2336 Add a test validating schema operations via file system call monitoring
          WT-2402 Misaligned structure accesses lead to undefined behavior
          WT-2670 Inefficient I/O when read full DB (poor readahead)
          WT-283 Add a way to change persistent object settings
          WT-2960 Inserting multi-megabyte values can cause pathological lookaside usage
          WT-2969 Possible snapshot corruption during compaction
          WT-3014 Add GCC/clang support for ELF symbol visibility.
          WT-3021 Fixes needed for Java log cursor example, Java raw mode cursors, log cursors in raw mode
          WT-3025 fix error path in log_force_sync
          WT-3028 Workloads with all dirty pages could trigger diagnostic stuck check
          WT-3030 Test failure indicating invalid key order during traversal
          WT-3034 Add support for single-writer named snapshots.
          WT-3037 Fix some outdated comments in logging
          WT-3048 WiredTiger maximum size warning uses the wrong format.
          WT-3051 Remove external __wt_hex symbol.
          WT-3052 Improve search if an index hint is wrong
          WT-3053 Review Python and Java calls to internal WiredTiger functions
          WT-3054 Java PackTest, PackTest03 do not compile
          WT-3055 Java AsyncTest faults
          WT-3056 For cursors with projections, keys should be allowed
          WT-3057 WiredTiger hazard pointers should use the WT_REF, not the WT_PAGE.
          WT-3061 syscall test runs with checkpoint_sync=false and doesn't acknowledge pwrite64
          WT-3064 minor tree cleanups: .gitignore, NEWS misspelling
          WT-3066 lint
          WT-3068 Copy wtperf artifacts when running Jenkins tests
          WT-3069 Fix build failures in LevelDB APIs
          WT-3070 Fix search_near() for index cursor
          WT-3071 Java: fix build with -Werror=sign-conversion
          WT-3075 Document and enforce that WiredTiger now depends on Python 2.7
          WT-3078 Fix a hang in the reconfiguration test.
          WT-3084 Fix Coverity resource leak complaint.
          Branch: v3.2
          https://github.com/mongodb/mongo/commit/52b68fa86ea43e909ad42c901d0579bced6b205f

          Show
          xgen-internal-githook Githook User added a comment - Author: {u'username': u'daveh86', u'name': u'David Hows', u'email': u'howsdav@gmail.com'} Message: Import wiredtiger: d48181f6f4db08761ed7b80b0332908b272ad0d0 from branch mongodb-3.2 ref: 040e3d6f76..d48181f6f4 for: 3.2.12 SERVER-26545 Remove fixed-size limitation on WiredTiger hazard pointers WT-2336 Add a test validating schema operations via file system call monitoring WT-2402 Misaligned structure accesses lead to undefined behavior WT-2670 Inefficient I/O when read full DB (poor readahead) WT-283 Add a way to change persistent object settings WT-2960 Inserting multi-megabyte values can cause pathological lookaside usage WT-2969 Possible snapshot corruption during compaction WT-3014 Add GCC/clang support for ELF symbol visibility. WT-3021 Fixes needed for Java log cursor example, Java raw mode cursors, log cursors in raw mode WT-3025 fix error path in log_force_sync WT-3028 Workloads with all dirty pages could trigger diagnostic stuck check WT-3030 Test failure indicating invalid key order during traversal WT-3034 Add support for single-writer named snapshots. WT-3037 Fix some outdated comments in logging WT-3048 WiredTiger maximum size warning uses the wrong format. WT-3051 Remove external __wt_hex symbol. WT-3052 Improve search if an index hint is wrong WT-3053 Review Python and Java calls to internal WiredTiger functions WT-3054 Java PackTest, PackTest03 do not compile WT-3055 Java AsyncTest faults WT-3056 For cursors with projections, keys should be allowed WT-3057 WiredTiger hazard pointers should use the WT_REF, not the WT_PAGE. WT-3061 syscall test runs with checkpoint_sync=false and doesn't acknowledge pwrite64 WT-3064 minor tree cleanups: .gitignore, NEWS misspelling WT-3066 lint WT-3068 Copy wtperf artifacts when running Jenkins tests WT-3069 Fix build failures in LevelDB APIs WT-3070 Fix search_near() for index cursor WT-3071 Java: fix build with -Werror=sign-conversion WT-3075 Document and enforce that WiredTiger now depends on Python 2.7 WT-3078 Fix a hang in the reconfiguration test. WT-3084 Fix Coverity resource leak complaint. Branch: v3.2 https://github.com/mongodb/mongo/commit/52b68fa86ea43e909ad42c901d0579bced6b205f
          Hide
          xgen-internal-githook Githook User added a comment -

          Author:

          {u'username': u'daveh86', u'name': u'David Hows', u'email': u'howsdav@gmail.com'}

          Message: Import wiredtiger: 8d2324943364286056ae399043f70b8a937de312 from branch mongodb-3.4

          ref: ca6eee06ff..8d23249433
          for: 3.4.2

          SERVER-26545 Remove fixed-size limitation on WiredTiger hazard pointers
          WT-2336 Add a test validating schema operations via file system call monitoring
          WT-2402 Misaligned structure accesses lead to undefined behavior
          WT-2670 Inefficient I/O when read full DB (poor readahead)
          WT-283 Add a way to change persistent object settings
          WT-2960 Inserting multi-megabyte values can cause pathological lookaside usage
          WT-2969 Possible snapshot corruption during compaction
          WT-3014 Add GCC/clang support for ELF symbol visibility.
          WT-3021 Fixes needed for Java log cursor example, Java raw mode cursors, log cursors in raw mode
          WT-3025 fix error path in log_force_sync
          WT-3028 Workloads with all dirty pages could trigger diagnostic stuck check
          WT-3030 Test failure indicating invalid key order during traversal
          WT-3034 Add support for single-writer named snapshots.
          WT-3037 Fix some outdated comments in logging
          WT-3048 WiredTiger maximum size warning uses the wrong format.
          WT-3051 Remove external __wt_hex symbol.
          WT-3052 Improve search if an index hint is wrong
          WT-3053 Review Python and Java calls to internal WiredTiger functions
          WT-3054 Java PackTest, PackTest03 do not compile
          WT-3055 Java AsyncTest faults
          WT-3056 For cursors with projections, keys should be allowed
          WT-3057 WiredTiger hazard pointers should use the WT_REF, not the WT_PAGE.
          WT-3061 syscall test runs with checkpoint_sync=false and doesn't acknowledge pwrite64
          WT-3064 minor tree cleanups: .gitignore, NEWS misspelling
          WT-3066 lint
          WT-3068 Copy wtperf artifacts when running Jenkins tests
          WT-3069 Fix build failures in LevelDB APIs
          WT-3070 Fix search_near() for index cursor
          WT-3071 Java: fix build with -Werror=sign-conversion
          WT-3075 Document and enforce that WiredTiger now depends on Python 2.7
          WT-3078 Fix a hang in the reconfiguration test.
          WT-3084 Fix Coverity resource leak complaint.
          Branch: v3.4
          https://github.com/mongodb/mongo/commit/d2c64ac8c526b70eadeb859ec41370a5f03a64aa

          Show
          xgen-internal-githook Githook User added a comment - Author: {u'username': u'daveh86', u'name': u'David Hows', u'email': u'howsdav@gmail.com'} Message: Import wiredtiger: 8d2324943364286056ae399043f70b8a937de312 from branch mongodb-3.4 ref: ca6eee06ff..8d23249433 for: 3.4.2 SERVER-26545 Remove fixed-size limitation on WiredTiger hazard pointers WT-2336 Add a test validating schema operations via file system call monitoring WT-2402 Misaligned structure accesses lead to undefined behavior WT-2670 Inefficient I/O when read full DB (poor readahead) WT-283 Add a way to change persistent object settings WT-2960 Inserting multi-megabyte values can cause pathological lookaside usage WT-2969 Possible snapshot corruption during compaction WT-3014 Add GCC/clang support for ELF symbol visibility. WT-3021 Fixes needed for Java log cursor example, Java raw mode cursors, log cursors in raw mode WT-3025 fix error path in log_force_sync WT-3028 Workloads with all dirty pages could trigger diagnostic stuck check WT-3030 Test failure indicating invalid key order during traversal WT-3034 Add support for single-writer named snapshots. WT-3037 Fix some outdated comments in logging WT-3048 WiredTiger maximum size warning uses the wrong format. WT-3051 Remove external __wt_hex symbol. WT-3052 Improve search if an index hint is wrong WT-3053 Review Python and Java calls to internal WiredTiger functions WT-3054 Java PackTest, PackTest03 do not compile WT-3055 Java AsyncTest faults WT-3056 For cursors with projections, keys should be allowed WT-3057 WiredTiger hazard pointers should use the WT_REF, not the WT_PAGE. WT-3061 syscall test runs with checkpoint_sync=false and doesn't acknowledge pwrite64 WT-3064 minor tree cleanups: .gitignore, NEWS misspelling WT-3066 lint WT-3068 Copy wtperf artifacts when running Jenkins tests WT-3069 Fix build failures in LevelDB APIs WT-3070 Fix search_near() for index cursor WT-3071 Java: fix build with -Werror=sign-conversion WT-3075 Document and enforce that WiredTiger now depends on Python 2.7 WT-3078 Fix a hang in the reconfiguration test. WT-3084 Fix Coverity resource leak complaint. Branch: v3.4 https://github.com/mongodb/mongo/commit/d2c64ac8c526b70eadeb859ec41370a5f03a64aa
          Hide
          xgen-internal-githook Githook User added a comment -

          Author:

          {u'username': u'daveh86', u'name': u'David Hows', u'email': u'howsdav@gmail.com'}

          Message: Import wiredtiger: 48a3cbc17fa902528217287fd075c87efb44aebc from branch mongodb-3.6

          ref: 8d23249433..48a3cbc17f
          for: 3.5.2

          SERVER-16796 Increase logging activity for journal recovery operations
          WT-2 What does metadata look like?
          WT-2402 Misaligned structure accesses lead to undefined behavior
          WT-2771 Add a statistic to track per-btree dirty cache usage
          WT-2833 improvement: add projections to wt dump utility
          WT-2898 Improve performance of eviction-heavy workloads by dynamically controlling the number of eviction threads
          WT-2994 Create documentation describing page sizes and relationships
          WT-3080 Python test suite: add timestamp or elapsed time for tests
          WT-3082 Python test suite: shorten default run to avoid pull request timeouts.
          WT-3083 Fix a bug in wtperf config dump
          WT-3086 Add transaction state information to cache stuck diagnostic information
          WT-3091 Add stats to test_perf0001
          WT-3092 Quiet a warning from autogen.sh
          WT-3093 Padding the WT_RWLOCK structure grew the WT_PAGE structure.
          WT-3099 lint: static function declarations, non-text characters in documentation
          WT-3100 test bug: format is weighted to delete, insert, then write operations.
          WT-3104 Fix wtperf configs for eviction tests
          WT-3105 Fix a deadlock caused by allocating eviction thread sessions dynamically
          WT-3106 Add truncate support to command line wt utility
          WT-3108 Also dump disk page size as part of metadata information
          WT-3109 wording fix in transaction doc
          WT-3110 Add more test cases for the WT command line utility
          WT-3112 Handle list lock statistic not incremented in eviction server
          WT-3114 Avoid archiving log files immediately after recovery
          WT-3116 Python style testing in s_all may not execute correctly
          WT-3118 Protect random-abort test against unexpectedly slow child start
          WT-3121 In test suite create standard way to load extensions
          WT-3127 bug: CPU yield calls don't necessarily imply memory barriers
          WT-3134 Coverity scan reports 1368529 and 1368528
          Branch: master
          https://github.com/mongodb/mongo/commit/c91b93d2786342505fd9e151c8aa6b68ee03a1fb

          Show
          xgen-internal-githook Githook User added a comment - Author: {u'username': u'daveh86', u'name': u'David Hows', u'email': u'howsdav@gmail.com'} Message: Import wiredtiger: 48a3cbc17fa902528217287fd075c87efb44aebc from branch mongodb-3.6 ref: 8d23249433..48a3cbc17f for: 3.5.2 SERVER-16796 Increase logging activity for journal recovery operations WT-2 What does metadata look like? WT-2402 Misaligned structure accesses lead to undefined behavior WT-2771 Add a statistic to track per-btree dirty cache usage WT-2833 improvement: add projections to wt dump utility WT-2898 Improve performance of eviction-heavy workloads by dynamically controlling the number of eviction threads WT-2994 Create documentation describing page sizes and relationships WT-3080 Python test suite: add timestamp or elapsed time for tests WT-3082 Python test suite: shorten default run to avoid pull request timeouts. WT-3083 Fix a bug in wtperf config dump WT-3086 Add transaction state information to cache stuck diagnostic information WT-3091 Add stats to test_perf0001 WT-3092 Quiet a warning from autogen.sh WT-3093 Padding the WT_RWLOCK structure grew the WT_PAGE structure. WT-3099 lint: static function declarations, non-text characters in documentation WT-3100 test bug: format is weighted to delete, insert, then write operations. WT-3104 Fix wtperf configs for eviction tests WT-3105 Fix a deadlock caused by allocating eviction thread sessions dynamically WT-3106 Add truncate support to command line wt utility WT-3108 Also dump disk page size as part of metadata information WT-3109 wording fix in transaction doc WT-3110 Add more test cases for the WT command line utility WT-3112 Handle list lock statistic not incremented in eviction server WT-3114 Avoid archiving log files immediately after recovery WT-3116 Python style testing in s_all may not execute correctly WT-3118 Protect random-abort test against unexpectedly slow child start WT-3121 In test suite create standard way to load extensions WT-3127 bug: CPU yield calls don't necessarily imply memory barriers WT-3134 Coverity scan reports 1368529 and 1368528 Branch: master https://github.com/mongodb/mongo/commit/c91b93d2786342505fd9e151c8aa6b68ee03a1fb
          Hide
          xgen-internal-githook Githook User added a comment -

          Author:

          {u'username': u'daveh86', u'name': u'David Hows', u'email': u'howsdav@gmail.com'}

          Message: WT-2402 Fix setting the Autoconf options too late for strict checking (#3209)

          Fix setting the Autoconf options too late for strict checking.
          Branch: mongodb-3.4
          https://github.com/wiredtiger/wiredtiger/commit/7742cd7a80a7ce76c6ab1cc5eb62ac2d1f4f0afd

          Show
          xgen-internal-githook Githook User added a comment - Author: {u'username': u'daveh86', u'name': u'David Hows', u'email': u'howsdav@gmail.com'} Message: WT-2402 Fix setting the Autoconf options too late for strict checking (#3209) Fix setting the Autoconf options too late for strict checking. Branch: mongodb-3.4 https://github.com/wiredtiger/wiredtiger/commit/7742cd7a80a7ce76c6ab1cc5eb62ac2d1f4f0afd
          Hide
          xgen-internal-githook Githook User added a comment -

          Author:

          {u'username': u'agorrod', u'name': u'Alex Gorrod', u'email': u'alexander.gorrod@mongodb.com'}

          Message: Import wiredtiger: d6659de8d742b9562d08c1ba5138be881f8e24fa from branch mongodb-3.4

          ref: 8d23249433..d6659de8d7
          for: 3.4.3

          SERVER-16796 Increase logging activity for journal recovery operations
          WT-2402 Misaligned structure accesses lead to undefined behavior
          WT-2771 Add a statistic to track per-btree dirty cache usage
          WT-2790 Fix a text case false positive in test_sweep01
          WT-2833 improvement: add projections to wt dump utility
          WT-2898 Improve performance of eviction-heavy workloads by dynamically controlling the number of eviction threads
          WT-2909 Create automatable test verifying checkpoint integrity after errors
          WT-2994 Create documentation describing page sizes and relationships
          WT-3080 Python test suite: add timestamp or elapsed time for tests
          WT-3082 Python test suite: shorten default run to avoid pull request timeouts.
          WT-3083 Fix a bug in wtperf config dump
          WT-3086 Add transaction state information to cache stuck diagnostic information
          WT-3088 bug: Don't evict a page with refs visible to readers after a split
          WT-3091 Add stats to test_perf0001
          WT-3092 Quiet a warning from autogen.sh
          WT-3093 Padding the WT_RWLOCK structure grew the WT_PAGE structure.
          WT-3097 Race on reconfigure or shutdown can lead to waiting for statistics log server
          WT-3099 lint: static function declarations, non-text characters in documentation
          WT-3100 test bug: format is weighted to delete, insert, then write operations.
          WT-3104 Fix wtperf configs for eviction tests
          WT-3105 Fix a deadlock caused by allocating eviction thread sessions dynamically
          WT-3106 Add truncate support to command line wt utility
          WT-3108 Also dump disk page size as part of metadata information
          WT-3109 wording fix in transaction doc
          WT-3110 Add more test cases for the WT command line utility
          WT-3111 util_create() doesnt free memory assigned to "uri"
          WT-3112 Handle list lock statistic not incremented in eviction server
          WT-3113 Add a verbose mode to dump the cache when eviction is stuck
          WT-3114 Avoid archiving log files immediately after recovery
          WT-3115 Change the dhandle lock to a read/write lock
          WT-3116 Python style testing in s_all may not execute correctly
          WT-3118 Protect random-abort test against unexpectedly slow child start
          WT-3120 Fix ordering problem in connection_close for filesystem loaded in an extension
          WT-3121 In test suite create standard way to load extensions
          WT-3126 Fix a bug in dist/s_all script
          WT-3127 bug: CPU yield calls don't necessarily imply memory barriers
          WT-3128 Fix a bug where wt printlog returns operation-not-supported if it doesn't find any log files
          WT-3130 Proposal to change initialization of custom filesystem
          WT-3134 Coverity scan reports 1368529 and 1368528
          WT-3135 search_near() for index with custom collator
          WT-3137 Hang in _log_slot_join/_log_slot_switch_internal
          WT-3139 Enhance wtperf to support periodic table scans
          WT-3143 Fix Coverity static analysis complaint in test program
          WT-3144 bug fix: random cursor returns not-found when descending to an empty page
          WT-3148 Improve eviction efficiency with many small trees
          WT-3149 Change eviction to start new walks from a random place in the tree
          WT-3150 Reduce impact of checkpoints on eviction server
          WT-3152 Convert table lock from a spinlock to a read write lock
          WT-3156 Assertion in log_write fires after write failure
          WT-3157 checkpoint/transaction integrity issue when writes fail.
          WT-3159 Incorrect key for index containing multiple variable sized entries
          WT-3161 checkpoint hang after write failure injection.
          WT-3164 Ensure all relevant btree fields are reset on checkpoint error
          WT-3170 Clear the eviction walk point while populating from a tree
          WT-3173 Add runtime detection for s390x CRC32 hardware support
          WT-3174 Coverity/lint cleanup
          WT-3175 New hang in internal page split
          WT-3179 test bug: clang sanitizer failure in fail_fs
          WT-3180 fault injection tests should only run as "long" tests and should not create core files
          WT-3184 Problem duplicating index cursor with custom collator
          WT-3186 Fix error path and panic detection in logging loops
          WT-3187 Hang on shutdown with a busy cache pool
          WT-3188 Fix error handling in logging where fatal errors could lead to a hang
          WT-3189 Fix a segfault in the eviction server random positioning
          Branch: v3.4
          https://github.com/mongodb/mongo/commit/086c21e2b4c87952273fde78ab8fb18f18e8fdc6

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          xgen-internal-githook Githook User added a comment - Author: {u'username': u'agorrod', u'name': u'Alex Gorrod', u'email': u'alexander.gorrod@mongodb.com'} Message: Import wiredtiger: d6659de8d742b9562d08c1ba5138be881f8e24fa from branch mongodb-3.4 ref: 8d23249433..d6659de8d7 for: 3.4.3 SERVER-16796 Increase logging activity for journal recovery operations WT-2402 Misaligned structure accesses lead to undefined behavior WT-2771 Add a statistic to track per-btree dirty cache usage WT-2790 Fix a text case false positive in test_sweep01 WT-2833 improvement: add projections to wt dump utility WT-2898 Improve performance of eviction-heavy workloads by dynamically controlling the number of eviction threads WT-2909 Create automatable test verifying checkpoint integrity after errors WT-2994 Create documentation describing page sizes and relationships WT-3080 Python test suite: add timestamp or elapsed time for tests WT-3082 Python test suite: shorten default run to avoid pull request timeouts. WT-3083 Fix a bug in wtperf config dump WT-3086 Add transaction state information to cache stuck diagnostic information WT-3088 bug: Don't evict a page with refs visible to readers after a split WT-3091 Add stats to test_perf0001 WT-3092 Quiet a warning from autogen.sh WT-3093 Padding the WT_RWLOCK structure grew the WT_PAGE structure. WT-3097 Race on reconfigure or shutdown can lead to waiting for statistics log server WT-3099 lint: static function declarations, non-text characters in documentation WT-3100 test bug: format is weighted to delete, insert, then write operations. WT-3104 Fix wtperf configs for eviction tests WT-3105 Fix a deadlock caused by allocating eviction thread sessions dynamically WT-3106 Add truncate support to command line wt utility WT-3108 Also dump disk page size as part of metadata information WT-3109 wording fix in transaction doc WT-3110 Add more test cases for the WT command line utility WT-3111 util_create() doesnt free memory assigned to "uri" WT-3112 Handle list lock statistic not incremented in eviction server WT-3113 Add a verbose mode to dump the cache when eviction is stuck WT-3114 Avoid archiving log files immediately after recovery WT-3115 Change the dhandle lock to a read/write lock WT-3116 Python style testing in s_all may not execute correctly WT-3118 Protect random-abort test against unexpectedly slow child start WT-3120 Fix ordering problem in connection_close for filesystem loaded in an extension WT-3121 In test suite create standard way to load extensions WT-3126 Fix a bug in dist/s_all script WT-3127 bug: CPU yield calls don't necessarily imply memory barriers WT-3128 Fix a bug where wt printlog returns operation-not-supported if it doesn't find any log files WT-3130 Proposal to change initialization of custom filesystem WT-3134 Coverity scan reports 1368529 and 1368528 WT-3135 search_near() for index with custom collator WT-3137 Hang in _ log_slot_join/ _log_slot_switch_internal WT-3139 Enhance wtperf to support periodic table scans WT-3143 Fix Coverity static analysis complaint in test program WT-3144 bug fix: random cursor returns not-found when descending to an empty page WT-3148 Improve eviction efficiency with many small trees WT-3149 Change eviction to start new walks from a random place in the tree WT-3150 Reduce impact of checkpoints on eviction server WT-3152 Convert table lock from a spinlock to a read write lock WT-3156 Assertion in log_write fires after write failure WT-3157 checkpoint/transaction integrity issue when writes fail. WT-3159 Incorrect key for index containing multiple variable sized entries WT-3161 checkpoint hang after write failure injection. WT-3164 Ensure all relevant btree fields are reset on checkpoint error WT-3170 Clear the eviction walk point while populating from a tree WT-3173 Add runtime detection for s390x CRC32 hardware support WT-3174 Coverity/lint cleanup WT-3175 New hang in internal page split WT-3179 test bug: clang sanitizer failure in fail_fs WT-3180 fault injection tests should only run as "long" tests and should not create core files WT-3184 Problem duplicating index cursor with custom collator WT-3186 Fix error path and panic detection in logging loops WT-3187 Hang on shutdown with a busy cache pool WT-3188 Fix error handling in logging where fatal errors could lead to a hang WT-3189 Fix a segfault in the eviction server random positioning Branch: v3.4 https://github.com/mongodb/mongo/commit/086c21e2b4c87952273fde78ab8fb18f18e8fdc6

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