Description
When granting a role with many privileges the total size of the user document might overshoot the maximum BSONObj size 16MB. Actually the error happens when retrieving the user information in getUserDescription.
The enclosed test was run on mongod but I would assume the crash applies to mongos as well.
2014-02-12T19:31:17.531-0500 [conn2] Assertion: 10334:BSONObj size: 16839711 (0x100F41F) is invalid. Size must be between 0 and 16793600(16MB) First element: _id: "admin.admin"
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2014-02-12T19:31:17.535-0500 [conn2] 0x100766510 0x10070e15b 0x1006fc89a 0x1006fc73c 0x10000b150 0x10000818c 0x1000ced24 0x1000b31de 0x1000b2769 0x1001b9515 0x1001cdf66 0x1001f0cf5 0x1001f1bb5 0x1001f2e6b 0x100432395 0x1002e2560 0x10000f0c7 0x10071c8e1 0x1007a0491 0x7fff9111d899
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0 mongod 0x0000000100766510 _ZN5mongo15printStackTraceERSo + 64
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1 mongod 0x000000010070e15b _ZN5mongo10logContextEPKc + 155
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2 mongod 0x00000001006fc89a _ZN5mongo11msgassertedEiPKc + 346
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3 mongod 0x00000001006fc73c _ZN5mongo11msgassertedEiRKSs + 12
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4 mongod 0x000000010000b150 _ZNK5mongo7BSONObj14_assertInvalidEv + 1536
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5 mongod 0x000000010000818c _ZN5mongo14BSONObjBuilder3objEv + 156
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6 mongod 0x00000001000ced24 _ZN5mongo30AuthzManagerExternalStateLocal18getUserDescriptionERKNS_8UserNameEPNS_7BSONObjE + 4452
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7 mongod 0x00000001000b31de _ZN5mongo20AuthorizationManager12_fetchUserV2ERKNS_8UserNameEPSt8auto_ptrINS_4UserEE + 78
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8 mongod 0x00000001000b2769 _ZN5mongo20AuthorizationManager11acquireUserERKNS_8UserNameEPPNS_4UserE + 1065
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9 mongod 0x00000001001b9515 _ZN5mongoL19getCurrentUserRolesEPNS_20AuthorizationManagerERKNS_8UserNameEPNSt3tr113unordered_setINS_8RoleNameENS5_4hashIS7_EESt8equal_toIS7_ESaIS7_ELb0EEE + 37
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10 mongod 0x00000001001cdf66 _ZN5mongo19CmdGrantRolesToUser3runERKSsRNS_7BSONObjEiRSsRNS_14BSONObjBuilderEb + 982
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11 mongod 0x00000001001f0cf5 _ZN5mongo12_execCommandEPNS_7CommandERKSsRNS_7BSONObjEiRSsRNS_14BSONObjBuilderEb + 37
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12 mongod 0x00000001001f1bb5 _ZN5mongo7Command11execCommandEPS0_RNS_6ClientEiPKcRNS_7BSONObjERNS_14BSONObjBuilderEb + 2629
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13 mongod 0x00000001001f2e6b _ZN5mongo12_runCommandsEPKcRNS_7BSONObjERNS_11_BufBuilderINS_16TrivialAllocatorEEERNS_14BSONObjBuilderEbi + 875
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14 mongod 0x0000000100432395 _ZN5mongo11newRunQueryERNS_7MessageERNS_12QueryMessageERNS_5CurOpES1_ + 741
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15 mongod 0x00000001002e2560 _ZN5mongo16assembleResponseERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortE + 1696
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16 mongod 0x000000010000f0c7 _ZN5mongo16MyMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortEPNS_9LastErrorE + 183
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17 mongod 0x000000010071c8e1 _ZN5mongo17PortMessageServer17handleIncomingMsgEPv + 913
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