# MongoDB crashed by null pointer referencing

**URL:** <https://forums.percona.com/t/mongodb-crashed-by-null-pointer-referencing/15029>\
**Category:** Percona Server for MongoDB\
**Created:** [April 1, 2022, 10:23am UTC](https://forums.percona.com/t/mongodb-crashed-by-null-pointer-referencing/15029 "2022-04-01T10:23:03Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![chadr](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/chadr/32/3923_2.png) [@chadr](https://forums.percona.com/u/chadr)\
**Post date:** [April 1, 2022, 10:23am UTC](https://forums.percona.com/t/mongodb-crashed-by-null-pointer-referencing/15029/1 "2022-04-01T10:23:03Z")

</div>

Hello, I’m using 4.4.10-11 version of the Percona MongoDB with InMemory storage Engine. Sometimes, I can observed that the MongoDB had been crashed by null pointer referencing.

Here are details of that.

1. One member for single replicaset not sharding.

2. Options that used:  
{“t”:{“$date”:“2022-04-01T09:13:36.199+00:00”},“s”:“I”, “c”:“CONTROL”, “id”:21951, “ctx”:“initandlisten”,“msg”:“Options set by command line”,“attr”:{“options”:{“net”:{“bindIp”:“\*”,“compression”:{“compressors”:“snappy,zlib”},“port”:27017,“tls”:{“CAFile”:“/etc/mongodb-tls-internal/ca.crt”,“allowInvalidCertificates”:true,“certificateKeyFile”:“/etc/mongodb-tls-internal/client.crt”,“mode”:“preferTLS”}},“replication”:{“replSet”:“db-0-0”},“security”:{“keyFile”:“/etc/mongodb-internal/mongodb.key”,“relaxPermChecks”:true,“transitionToAuth”:true},“setParameter”:{“enableFlowControl”:“false”},“storage”:{“dbPath”:“/data/db”,“engine”:“inMemory”,“inMemory”:{“engineConfig”:{“inMemorySizeGB”:49.531648}}}}}}

3. Last crash log.  
{“t”:{“$date”:“2022-04-01T09:56:27.358+00:00”},“s”:“I”, “c”:“NETWORK”, “id”:22943, “ctx”:“listener”,“msg”:“Connection accepted”,“attr”:{“remote”:“10.128.16.2:45638”,“connectionId”:892,“connectionCount”:18}}  
{“t”:{“$date”:“2022-04-01T09:56:27.358+00:00”},“s”:“I”, “c”:“NETWORK”, “id”:22944, “ctx”:“conn892”,“msg”:“Connection ended”,“attr”:{“remote”:“10.128.16.2:45638”,“connectionId”:892,“connectionCount”:17}}  
{“t”:{“$date”:“2022-04-01T09:56:28.669+00:00”},“s”:“I”, “c”:“STORAGE”, “id”:22402, “ctx”:“OplogCapMaintainerThread-local.oplog.rs”,“msg”:“WiredTiger record store oplog truncation finished”,“attr”:{“durationMillis”:29}}  
{“t”:{“$date”:“2022-04-01T09:56:28.678+00:00”},“s”:“F”, “c”:“CONTROL”, “id”:4757800, “ctx”:“thread893”,“msg”:“Writing fatal message”,“attr”:{“message”:“Invalid access at address: 0”}}  
{“t”:{“$date”:“2022-04-01T09:56:28.678+00:00”},“s”:“F”, “c”:“CONTROL”, “id”:4757800, “ctx”:“thread893”,“msg”:“Writing fatal message”,“attr”:{“message”:“Got signal: 11 (Segmentation fault).\n”}}  
{“t”:{“$date”:“2022-04-01T09:56:28.709+00:00”},“s”:“I”, “c”:“CONTROL”, “id”:31431, “ctx”:“thread893”,“msg”:“BACKTRACE: {bt}”,“attr”:{“bt”:{“backtrace”:[{“a”:“558D1DAAD4CA”,“b”:“558D1AB9F000”,“o”:“2F0E4CA”,“s”:“\_ZN5mongo34StackTraceAddressMetadataGenerator4loadEPv”,“s+”:“62A”},{“a”:“558D1DAAEF59”,“b”:“558D1AB9F000”,“o”:“2F0FF59”,“s”:“\_ZN5mongo15printStackTraceEv”,“s+”:“29”},{“a”:“558D1DAAC42C”,“b”:“558D1AB9F000”,“o”:“2F0D42C”,“s”:“\_ZN5mongo16stackTraceSignalEv”,“s+”:“4BC”},{“a”:“7F2890200B20”,“b”:“7F28901EE000”,“o”:“12B20”,“s”:“funlockfile”,“s+”:“50”},{“a”:“558D1DC2CE5B”,“b”:“558D1AB9F000”,“o”:“308DE5B”,“s”:“\_ZN8tcmalloc11ThreadCache21ReleaseToCentralCacheEPNS0\_8FreeListEji”,“s+”:“EB”},{“a”:“558D1DC2D085”,“b”:“558D1AB9F000”,“o”:“308E085”,“s”:“\_ZN8tcmalloc11ThreadCache11ListTooLongEPNS0\_8FreeListEj”,“s+”:“35”},{“a”:“558D1BE121F0”,“b”:“558D1AB9F000”,“o”:“12731F0”,“s”:“\_\_wt\_page\_out”,“s+”:“6F0”},{“a”:“558D1BD6D0C3”,“b”:“558D1AB9F000”,“o”:“11CE0C3”,“s”:“\_\_wt\_evict”,“s+”:“1493”},{“a”:“558D1BD640BB”,“b”:“558D1AB9F000”,“o”:“11C50BB”,“s”:“\_\_wt\_evict\_thread\_chk”,“s+”:“D1B”},{“a”:“558D1BD64548”,“b”:“558D1AB9F000”,“o”:“11C5548”,“s”:“\_\_wt\_evict\_thread\_chk”,“s+”:“11A8”},{“a”:“558D1BD693B4”,“b”:“558D1AB9F000”,“o”:“11CA3B4”,“s”:“\_\_wt\_evict\_thread\_run”,“s+”:“74”},{“a”:“558D1BDCE4A9”,“b”:“558D1AB9F000”,“o”:“122F4A9”,“s”:“\_\_wt\_stat\_session\_clear\_single”,“s+”:“79”},{“a”:“7F28901F614A”,“b”:“7F28901EE000”,“o”:“814A”,“s”:“start\_thread”,“s+”:“EA”},{“a”:“7F288FF25DC3”,“b”:“7F288FE29000”,“o”:“FCDC3”,“s”:“clone”,“s+”:“43”}],“processInfo”:{“mongodbVersion”:“4.4.10-11”,“gitVersion”:“17077507fedd996277adb88715c384329950898b”,“compiledModules”:,“uname”:{“sysname”:“Linux”,“release”:“4.18.0-305.34.2.el8\_4.x86\_64”,“version”:“#1 SMP Mon Jan 17 09:42:23 EST 2022”,“machine”:“x86\_64”},“somap”:[{“b”:“558D1AB9F000”,“elfType”:3,“buildId”:“9D05E13AE7BD1F7956720B391A84EBE9FAB5AE0B”},{“b”:“7F28901EE000”,“path”:“/lib64/libpthread.so.0”,“elfType”:3,“buildId”:“CF6D86CF965B129EC9DFDCD756741E43233684AB”},{“b”:“7F288FE29000”,“path”:“/lib64/libc.so.6”,“elfType”:3,“buildId”:“A91D7B51B23A64E86B82A91511C446C137D3EC8E”}]}}}}  
{“t”:{“$date”:“2022-04-01T09:56:28.709+00:00”},“s”:“I”, “c”:“CONTROL”, “id”:31427, “ctx”:“thread893”,“msg”:" Frame: {frame}“,“attr”:{“frame”:{“a”:“558D1DAAD4CA”,“b”:“558D1AB9F000”,“o”:“2F0E4CA”,“s”:”\_ZN5mongo34StackTraceAddressMetadataGenerator4loadEPv",“s+”:“62A”}}}  
{“t”:{“$date”:“2022-04-01T09:56:28.709+00:00”},“s”:“I”, “c”:“CONTROL”, “id”:31427, “ctx”:“thread893”,“msg”:" Frame: {frame}“,“attr”:{“frame”:{“a”:“558D1DAAEF59”,“b”:“558D1AB9F000”,“o”:“2F0FF59”,“s”:”\_ZN5mongo15printStackTraceEv",“s+”:“29”}}}  
{“t”:{“$date”:“2022-04-01T09:56:28.709+00:00”},“s”:“I”, “c”:“CONTROL”, “id”:31427, “ctx”:“thread893”,“msg”:" Frame: {frame}“,“attr”:{“frame”:{“a”:“558D1DAAC42C”,“b”:“558D1AB9F000”,“o”:“2F0D42C”,“s”:”\_ZN5mongo16stackTraceSignalEv",“s+”:“4BC”}}}  
{“t”:{“$date”:“2022-04-01T09:56:28.709+00:00”},“s”:“I”, “c”:“CONTROL”, “id”:31427, “ctx”:“thread893”,“msg”:" Frame: {frame}“,“attr”:{“frame”:{“a”:“7F2890200B20”,“b”:“7F28901EE000”,“o”:“12B20”,“s”:“funlockfile”,“s+”:“50”}}}  
{“t”:{”$date":“2022-04-01T09:56:28.709+00:00”},“s”:“I”, “c”:“CONTROL”, “id”:31427, “ctx”:“thread893”,“msg”:" Frame: {frame}“,“attr”:{“frame”:{“a”:“558D1DC2CE5B”,“b”:“558D1AB9F000”,“o”:“308DE5B”,“s”:”\_ZN8tcmalloc11ThreadCache21ReleaseToCentralCacheEPNS0\_8FreeListEji",“s+”:“EB”}}}  
{“t”:{“$date”:“2022-04-01T09:56:28.709+00:00”},“s”:“I”, “c”:“CONTROL”, “id”:31427, “ctx”:“thread893”,“msg”:" Frame: {frame}“,“attr”:{“frame”:{“a”:“558D1DC2D085”,“b”:“558D1AB9F000”,“o”:“308E085”,“s”:”\_ZN8tcmalloc11ThreadCache11ListTooLongEPNS0\_8FreeListEj",“s+”:“35”}}}  
{“t”:{“$date”:“2022-04-01T09:56:28.709+00:00”},“s”:“I”, “c”:“CONTROL”, “id”:31427, “ctx”:“thread893”,“msg”:" Frame: {frame}“,“attr”:{“frame”:{“a”:“558D1BE121F0”,“b”:“558D1AB9F000”,“o”:“12731F0”,“s”:”\_\_wt\_page\_out",“s+”:“6F0”}}}  
{“t”:{“$date”:“2022-04-01T09:56:28.709+00:00”},“s”:“I”, “c”:“CONTROL”, “id”:31427, “ctx”:“thread893”,“msg”:" Frame: {frame}“,“attr”:{“frame”:{“a”:“558D1BD6D0C3”,“b”:“558D1AB9F000”,“o”:“11CE0C3”,“s”:”\_\_wt\_evict",“s+”:“1493”}}}  
{“t”:{“$date”:“2022-04-01T09:56:28.709+00:00”},“s”:“I”, “c”:“CONTROL”, “id”:31427, “ctx”:“thread893”,“msg”:" Frame: {frame}“,“attr”:{“frame”:{“a”:“558D1BD640BB”,“b”:“558D1AB9F000”,“o”:“11C50BB”,“s”:”\_\_wt\_evict\_thread\_chk",“s+”:“D1B”}}}  
{“t”:{“$date”:“2022-04-01T09:56:28.709+00:00”},“s”:“I”, “c”:“CONTROL”, “id”:31427, “ctx”:“thread893”,“msg”:" Frame: {frame}“,“attr”:{“frame”:{“a”:“558D1BD64548”,“b”:“558D1AB9F000”,“o”:“11C5548”,“s”:”\_\_wt\_evict\_thread\_chk",“s+”:“11A8”}}}  
{“t”:{“$date”:“2022-04-01T09:56:28.709+00:00”},“s”:“I”, “c”:“CONTROL”, “id”:31427, “ctx”:“thread893”,“msg”:" Frame: {frame}“,“attr”:{“frame”:{“a”:“558D1BD693B4”,“b”:“558D1AB9F000”,“o”:“11CA3B4”,“s”:”\_\_wt\_evict\_thread\_run",“s+”:“74”}}}  
{“t”:{“$date”:“2022-04-01T09:56:28.709+00:00”},“s”:“I”, “c”:“CONTROL”, “id”:31427, “ctx”:“thread893”,“msg”:" Frame: {frame}“,“attr”:{“frame”:{“a”:“558D1BDCE4A9”,“b”:“558D1AB9F000”,“o”:“122F4A9”,“s”:”\_\_wt\_stat\_session\_clear\_single",“s+”:“79”}}}  
{“t”:{“$date”:“2022-04-01T09:56:28.709+00:00”},“s”:“I”, “c”:“CONTROL”, “id”:31427, “ctx”:“thread893”,“msg”:" Frame: {frame}“,“attr”:{“frame”:{“a”:“7F28901F614A”,“b”:“7F28901EE000”,“o”:“814A”,“s”:“start\_thread”,“s+”:“EA”}}}  
{“t”:{”$date":“2022-04-01T09:56:28.709+00:00”},“s”:“I”, “c”:“CONTROL”, “id”:31427, “ctx”:“thread893”,“msg”:" Frame: {frame}",“attr”:{“frame”:{“a”:“7F288FF25DC3”,“b”:“7F288FE29000”,“o”:“FCDC3”,“s”:“clone”,“s+”:“43”}}}

4. Single document size is about 80kbytes.

Could you check it?

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<div class="post-metadata">

**Author:** ![Igor\_Solodovnikov](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/igor_solodovnikov/32/1265_2.png) [@Igor\_Solodovnikov](https://forums.percona.com/u/Igor_Solodovnikov)\
**Post date:** [April 21, 2022, 2:22pm UTC](https://forums.percona.com/t/mongodb-crashed-by-null-pointer-referencing/15029/2 "2022-04-21T14:22:03Z")

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Tracking this issue here: [[PSMDB-1026] MongoDB crashed by null pointer referencing - Percona JIRA](https://jira.percona.com/browse/PSMDB-1026)

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<div class="post-metadata">

**Author:** ![radoslaw.szulgo](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/radoslaw.szulgo/32/17315_2.png) [@radoslaw.szulgo](https://forums.percona.com/u/radoslaw.szulgo)\
**Post date:** [July 16, 2024, 10:55am UTC](https://forums.percona.com/t/mongodb-crashed-by-null-pointer-referencing/15029/3 "2024-07-16T10:55:41Z")

</div>

Hi @chadr - we’re going to verify this issue on the latest MongoDB release. Version 4.4.10-11 you had back then is already EOL.

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<div class="post-metadata">

**Author:** ![radoslaw.szulgo](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/radoslaw.szulgo/32/17315_2.png) [@radoslaw.szulgo](https://forums.percona.com/u/radoslaw.szulgo)\
**Post date:** [August 7, 2024, 7:53pm UTC](https://forums.percona.com/t/mongodb-crashed-by-null-pointer-referencing/15029/4 "2024-08-07T19:53:36Z")

</div>

The backtrace here looks quite similar to [https://jira.mongodb.org/browse/WT-7570](https://jira.mongodb.org/browse/WT-7570)  
A potential fix should be [https://jira.mongodb.org/browse/WT-11280](https://jira.mongodb.org/browse/WT-11280)

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<div class="post-metadata">

**Author:** ![radoslaw.szulgo](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/radoslaw.szulgo/32/17315_2.png) [@radoslaw.szulgo](https://forums.percona.com/u/radoslaw.szulgo)\
**Post date:** [September 25, 2025, 12:46pm UTC](https://forums.percona.com/t/mongodb-crashed-by-null-pointer-referencing/15029/5 "2025-09-25T12:46:28Z")

</div>

Seems it’s fixed in [4.4.29](https://jira.mongodb.org/issues/?jql=project+%3D+WT+AND+fixVersion+%3D+4.4.29 "4.4.29")

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<div class="post-metadata">

**Author:** ![Ivan\_Groenewold](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/ivan_groenewold/32/6299_2.png) [@Ivan\_Groenewold](https://forums.percona.com/u/Ivan_Groenewold)\
**Post date:** [November 7, 2025, 11:30am UTC](https://forums.percona.com/t/mongodb-crashed-by-null-pointer-referencing/15029/6 "2025-11-07T11:30:42Z")

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