$ mongod --dbpath db --repair
2016-11-06T23:50:43.427-0500 I CONTROL  [initandlisten] MongoDB starting : pid=15289 port=27017 dbpath=db 64-bit host=cryoem
2016-11-06T23:50:43.432-0500 I CONTROL  [initandlisten] db version v3.2.9
2016-11-06T23:50:43.432-0500 I CONTROL  [initandlisten] git version: 22ec9e93b40c85fc7cae7d56e7d6a02fd811088c
2016-11-06T23:50:43.432-0500 I CONTROL  [initandlisten] allocator: tcmalloc
2016-11-06T23:50:43.432-0500 I CONTROL  [initandlisten] modules: none
2016-11-06T23:50:43.432-0500 I CONTROL  [initandlisten] build environment:
2016-11-06T23:50:43.432-0500 I CONTROL  [initandlisten]     distarch: x86_64
2016-11-06T23:50:43.432-0500 I CONTROL  [initandlisten]     target_arch: x86_64
2016-11-06T23:50:43.432-0500 I CONTROL  [initandlisten] options: { repair: true, storage: { dbPath: "db" } }
2016-11-06T23:50:43.518-0500 I -        [initandlisten] Detected data files in db created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.
2016-11-06T23:50:43.518-0500 I STORAGE  [initandlisten] wiredtiger_open config: create,cache_size=37G,session_max=20000,eviction=(threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),checkpoint=(wait=60,log_size=2GB),statistics_log=(wait=0),,log=(enabled=false),
2016-11-06T23:50:43.535-0500 E STORAGE  [initandlisten] WiredTiger (0) [1478494243:535100][15289:0x7f652cdcccc0], file:WiredTiger.wt, connection: read checksum error for 4096B block at offset 24576: block header checksum of 1970325808 doesn't match expected checksum of 3338308183
2016-11-06T23:50:43.535-0500 E STORAGE  [initandlisten] WiredTiger (0) [1478494243:535188][15289:0x7f652cdcccc0], file:WiredTiger.wt, connection: WiredTiger.wt: encountered an illegal file format or internal value
2016-11-06T23:50:43.535-0500 E STORAGE  [initandlisten] WiredTiger (-31804) [1478494243:535214][15289:0x7f652cdcccc0], file:WiredTiger.wt, connection: the process must exit and restart: WT_PANIC: WiredTiger library panic
2016-11-06T23:50:43.535-0500 I -        [initandlisten] Fatal Assertion 28558
2016-11-06T23:50:43.535-0500 I -        [initandlisten]

***aborting after fassert() failure


2016-11-06T23:50:43.573-0500 F -        [initandlisten] Got signal: 6 (Aborted).

 0x1307192 0x13060b9 0x13068c2 0x7f652c097330 0x7f652bcf8c37 0x7f652bcfc028 0x1299422 0x108a733 0x1a7e13c 0x1a7e5bd 0x1a7e9a4 0x19a9c3c 0x19aa193 0x19a6e65 0x19ab1f9 0x19c888c 0x1a00700 0x1a7d087 0x1a7d5c9 0x1a7d6eb 0x1a0f2e8 0x1a7a225 0x1a43f0f 0x1a4400e 0x19fc4e3 0x1071baf 0x106dcf3 0xf91de8 0x95f6fe 0x961c90 0x964ead 0x7f652bce3f45 0x95c0b9
----- BEGIN BACKTRACE -----
{"backtrace":[{"b":"400000","o":"F07192","s":"_ZN5mongo15printStackTraceERSo"},{"b":"400000","o":"F060B9"},{"b":"400000","o":"F068C2"},{"b":"7F652C087000","o":"10330"},{"b":"7F652BCC2000","o":"36C37","s":"gsignal"},{"b":"7F652BCC2000","o":"3A028","s":"abort"},{"b":"400000","o":"E99422","s":"_ZN5mongo13fassertFailedEi"},{"b":"400000","o":"C8A733"},{"b":"400000","o":"167E13C","s":"__wt_eventv"},{"b":"400000","o":"167E5BD","s":"__wt_err"},{"b":"400000","o":"167E9A4","s":"__wt_panic"},{"b":"400000","o":"15A9C3C","s":"__wt_block_extlist_read"},{"b":"400000","o":"15AA193","s":"__wt_block_extlist_read_avail"},{"b":"400000","o":"15A6E65","s":"__wt_block_checkpoint_load"},{"b":"400000","o":"15AB1F9"},{"b":"400000","o":"15C888C","s":"__wt_btree_open"},{"b":"400000","o":"1600700","s":"__wt_conn_btree_open"},{"b":"400000","o":"167D087","s":"__wt_session_get_btree"},{"b":"400000","o":"167D5C9","s":"__wt_session_get_btree"},{"b":"400000","o":"167D6EB","s":"__wt_session_get_btree_ckpt"},{"b":"400000","o":"160F2E8","s":"__wt_curfile_open"},{"b":"400000","o":"167A225"},{"b":"400000","o":"1643F0F","s":"__wt_metadata_cursor_open"},{"b":"400000","o":"164400E","s":"__wt_metadata_cursor"},{"b":"400000","o":"15FC4E3","s":"wiredtiger_open"},{"b":"400000","o":"C71BAF","s":"_ZN5mongo18WiredTigerKVEngineC2ERKSsS2_S2_mbbb"},{"b":"400000","o":"C6DCF3"},{"b":"400000","o":"B91DE8","s":"_ZN5mongo20ServiceContextMongoD29initializeGlobalStorageEngineEv"},{"b":"400000","o":"55F6FE"},{"b":"400000","o":"561C90","s":"_ZN5mongo13initAndListenEi"},{"b":"400000","o":"564EAD","s":"main"},{"b":"7F652BCC2000","o":"21F45","s":"__libc_start_main"},{"b":"400000","o":"55C0B9"}],"processInfo":{ "mongodbVersion" : "3.2.9", "gitVersion" : "22ec9e93b40c85fc7cae7d56e7d6a02fd811088c", "compiledModules" : [], "uname" : { "sysname" : "Linux", "release" : "3.16.0-76-generic", "version" : "#98~14.04.1-Ubuntu SMP Fri Jun 24 17:04:54 UTC 2016", "machine" : "x86_64" }, "somap" : [ { "elfType" : 2, "b" : "400000" }, { "b" : "7FFFB59F4000", "elfType" : 3 }, { "b" : "7F652C9C5000", "path" : "/lib/x86_64-linux-gnu/librt.so.1", "elfType" : 3 }, { "b" : "7F652C7C1000", "path" : "/lib/x86_64-linux-gnu/libdl.so.2", "elfType" : 3 }, { "b" : "7F652C4BB000", "path" : "/lib/x86_64-linux-gnu/libm.so.6", "elfType" : 3 }, { "b" : "7F652C2A5000", "path" : "/lib/x86_64-linux-gnu/libgcc_s.so.1", "elfType" : 3 }, { "b" : "7F652C087000", "path" : "/lib/x86_64-linux-gnu/libpthread.so.0", "elfType" : 3 }, { "b" : "7F652BCC2000", "path" : "/lib/x86_64-linux-gnu/libc.so.6", "elfType" : 3 }, { "b" : "7F652CBCD000", "path" : "/lib64/ld-linux-x86-64.so.2", "elfType" : 3 } ] }}
 mongod(_ZN5mongo15printStackTraceERSo+0x32) [0x1307192]
 mongod(+0xF060B9) [0x13060b9]
 mongod(+0xF068C2) [0x13068c2]
 libpthread.so.0(+0x10330) [0x7f652c097330]
 libc.so.6(gsignal+0x37) [0x7f652bcf8c37]
 libc.so.6(abort+0x148) [0x7f652bcfc028]
 mongod(_ZN5mongo13fassertFailedEi+0x82) [0x1299422]
 mongod(+0xC8A733) [0x108a733]
 mongod(__wt_eventv+0x42C) [0x1a7e13c]
 mongod(__wt_err+0x8D) [0x1a7e5bd]
 mongod(__wt_panic+0x24) [0x1a7e9a4]
 mongod(__wt_block_extlist_read+0x6C) [0x19a9c3c]
 mongod(__wt_block_extlist_read_avail+0x33) [0x19aa193]
 mongod(__wt_block_checkpoint_load+0x3C5) [0x19a6e65]
 mongod(+0x15AB1F9) [0x19ab1f9]
 mongod(__wt_btree_open+0xC7C) [0x19c888c]
 mongod(__wt_conn_btree_open+0x140) [0x1a00700]
 mongod(__wt_session_get_btree+0xE7) [0x1a7d087]
 mongod(__wt_session_get_btree+0x629) [0x1a7d5c9]
 mongod(__wt_session_get_btree_ckpt+0xAB) [0x1a7d6eb]
 mongod(__wt_curfile_open+0x218) [0x1a0f2e8]
 mongod(+0x167A225) [0x1a7a225]
 mongod(__wt_metadata_cursor_open+0x5F) [0x1a43f0f]
 mongod(__wt_metadata_cursor+0x7E) [0x1a4400e]
 mongod(wiredtiger_open+0x1433) [0x19fc4e3]
 mongod(_ZN5mongo18WiredTigerKVEngineC2ERKSsS2_S2_mbbb+0x77F) [0x1071baf]
 mongod(+0xC6DCF3) [0x106dcf3]
 mongod(_ZN5mongo20ServiceContextMongoD29initializeGlobalStorageEngineEv+0x598) [0xf91de8]
 mongod(+0x55F6FE) [0x95f6fe]
 mongod(_ZN5mongo13initAndListenEi+0x10) [0x961c90]
 mongod(main+0x15D) [0x964ead]
 libc.so.6(__libc_start_main+0xF5) [0x7f652bce3f45]
 mongod(+0x55C0B9) [0x95c0b9]
-----  END BACKTRACE  -----
Aborted (core dumped)