[Bug]: Crash when run jepsen test #322
Description
mongod log:
2025-11-19T20:28:45.481+0800 I COMMAND [thread_group_1] command tpcc.$cmd command: update { update: "STOCK", ordered: true, lsid: { id: UUID("107e90ac-acd3-4f2a-83dc-faa3003fb501") }, txnNumber: 784, autocommit: false, $db: "tpcc" } numYields:0 reslen:60 locks:{} proto
col:op_msg 191ms
2025-11-19T20:28:45.557+0800 I TXN [thread_group_0] transaction parameters:{ lsid: { id: UUID("18aa718e-0a2b-4c78-b92e-27b931ee7261"), uid: BinData(0, E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855) }, txnNumber: 818, autocommit: false, readConcer
n: { level: "snapshot" } }, readTimestamp:Timestamp(0, 0), keysExamined:3 docsExamined:3 nMatched:2 nModified:2 ninserted:1 keysInserted:1 terminationCause:committed timeActiveMicros:2282098 timeInactiveMicros:27960 numYields:0 locks:{} 2310ms
2025-11-19T20:28:45.558+0800 I COMMAND [thread_group_0] command admin.$cmd command: commitTransaction { commitTransaction: 1, lsid: { id: UUID("18aa718e-0a2b-4c78-b92e-27b931ee7261") }, txnNumber: 818, autocommit: false, writeConcern: { w: 1 }, $db: "admin" } numYields
:0 reslen:38 locks:{} protocol:op_msg 189ms
2025-11-19T20:28:45.559+0800 I TXN [thread_group_3] transaction parameters:{ lsid: { id: UUID("c171548c-4579-44c5-bfe7-f1d3efd98ea1"), uid: BinData(0, E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855) }, txnNumber: 966, autocommit: false, readConcer
n: { level: "snapshot" } }, readTimestamp:Timestamp(0, 0), keysExamined:43 docsExamined:22 nMatched:1 nModified:1 ninserted:2 keysInserted:6 keysDeleted:1 terminationCause:committed timeActiveMicros:3321019 timeInactiveMicros:29747 numYields:0 locks:{} 3350ms
2025-11-19T20:28:45.559+0800 I COMMAND [thread_group_3] command admin.$cmd command: commitTransaction { commitTransaction: 1, lsid: { id: UUID("c171548c-4579-44c5-bfe7-f1d3efd98ea1") }, txnNumber: 966, autocommit: false, writeConcern: { w: 1 }, $db: "admin" } numYields
:0 reslen:38 locks:{} protocol:op_msg 1150ms
2025-11-19T20:28:45.562+0800 I COMMAND [thread_group_1] command tpcc.CUSTOMER command: find { find: "CUSTOMER", filter: { C_W_ID: 356, C_D_ID: 9, $comment: "PAYMENT", C_LAST: "PRESPRIPRI" }, projection: { C_BALANCE: 0, C_YTD_PAYMENT: 0, C_PAYMENT_CNT: 0 }, lsid: { id:
UUID("91c4a852-ecb7-41da-9c92-018a35a713b2") }, txnNumber: 784, autocommit: false, $db: "tpcc" } planSummary: IXSCAN { C_W_ID: 1, C_D_ID: 1, C_LAST: 1 } keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nreturned:1 reslen:962 locks:{} protocol:op_msg 2077ms
2025-11-19T20:28:45.564+0800 I COMMAND [thread_group_1] command tpcc.$cmd command: update { update: "STOCK", ordered: true, lsid: { id: UUID("5cabdf65-d2a7-4a75-b240-8a167fb83226") }, txnNumber: 815, autocommit: false, $db: "tpcc" } numYields:0 reslen:60 locks:{} proto
col:op_msg 171ms
2025-11-19T20:28:45.573+0800 I COMMAND [thread_group_0] command tpcc.CUSTOMER command: find { find: "CUSTOMER", filter: { C_W_ID: 330, C_D_ID: 2, $comment: "PAYMENT", C_LAST: "BARESEBAR" }, projection: { C_BALANCE: 0, C_YTD_PAYMENT: 0, C_PAYMENT_CNT: 0 }, lsid: { id: U
UID("eb8a1495-2ef1-4000-9839-c2514a0fbc09") }, txnNumber: 796, autocommit: false, $db: "tpcc" } planSummary: IXSCAN { C_W_ID: 1, C_D_ID: 1, C_LAST: 1 } keysExamined:1 docsExamined:1 cursorExhausted:1 numYields:0 nreturned:1 reslen:873 locks:{} protocol:op_msg 2155ms
2025-11-19T20:28:45.573+0800 I COMMAND [thread_group_1] command tpcc.$cmd command: update { update: "STOCK", ordered: true, lsid: { id: UUID("eabbf6bc-de3d-4801-bd4f-711b891f6494") }, txnNumber: 764, autocommit: false, $db: "tpcc" } numYields:0 reslen:60 locks:{} proto
col:op_msg 284ms
2025-11-19T20:28:45.581+0800 F - [thread_group_1] Invalid access at address: 0
2025-11-19T20:28:45.584+0800 I COMMAND [thread_group_0] command jepsendb.jepsencoll command: create { create: "jepsencoll", capped: false, writeConcern: { w: "majority" }, $db: "jepsendb", lsid: { id: UUID("7e75646c-b481-435b-823c-1ee4a6e7bd52") } } numYields:0 ok:0 er
rMsg:"a collection 'jepsendb.jepsencoll' already exists" errName:NamespaceExists errCode:48 reslen:140 locks:{} protocol:op_msg 495017ms
2025-11-19T20:28:45.584+0800 I NETWORK [thread_group_0] Error sending response to client: SocketException: Broken pipe. Ending connection from 192.168.122.31:57592 (connection id: 239)
2025-11-19T20:28:45.584+0800 I NETWORK [thread_group_0] end connection 192.168.122.31:57592 (243 connections now open)
2025-11-19T20:28:45.585+0800 I COMMAND [thread_group_2] command jepsendb.jepsencoll command: create { create: "jepsencoll", capped: false, writeConcern: { w: "majority" }, $db: "jepsendb", lsid: { id: UUID("d512efe8-a02c-469b-822f-96363ab9719d") } } numYields:0 ok:0 er
rMsg:"a collection 'jepsendb.jepsencoll' already exists" errName:NamespaceExists errCode:48 reslen:140 locks:{} protocol:op_msg 515113ms
2025-11-19T20:28:45.585+0800 I NETWORK [thread_group_2] Error sending response to client: SocketException: Broken pipe. Ending connection from 192.168.122.31:46388 (connection id: 235)
2025-11-19T20:28:45.585+0800 I NETWORK [thread_group_2] end connection 192.168.122.31:46388 (242 connections now open)
2025-11-19T20:28:45.587+0800 I TXN [thread_group_0] transaction parameters:{ lsid: { id: UUID("97a67bb9-f879-4f8a-b833-b4c6f90b6f70"), uid: BinData(0, E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855) }, txnNumber: 735, autocommit: false, readConcer
n: { level: "snapshot" } }, readTimestamp:Timestamp(0, 0), keysExamined:47 docsExamined:24 nMatched:1 nModified:1 ninserted:2 keysInserted:6 keysDeleted:1 terminationCause:committed timeActiveMicros:3211198 timeInactiveMicros:24311 numYields:0 locks:{} 3235ms
2025-11-19T20:28:45.587+0800 I COMMAND [thread_group_0] command admin.$cmd command: commitTransaction { commitTransaction: 1, lsid: { id: UUID("97a67bb9-f879-4f8a-b833-b4c6f90b6f70") }, txnNumber: 735, autocommit: false, writeConcern: { w: 1 }, $db: "admin" } numYields
:0 reslen:38 locks:{} protocol:op_msg 379ms
2025-11-19T20:28:45.588+0800 I COMMAND [thread_group_2] command jepsendb.jepsencoll command: create { create: "jepsencoll", capped: false, writeConcern: { w: "majority" }, $db: "jepsendb", lsid: { id: UUID("1547b995-7a0c-4e4e-9221-eea708fe958a") } } numYields:0 ok:0 er
rMsg:"a collection 'jepsendb.jepsencoll' already exists" errName:NamespaceExists errCode:48 reslen:140 locks:{} protocol:op_msg 475003ms
2025-11-19T20:28:45.588+0800 I COMMAND [thread_group_0] command jepsendb.jepsencoll command: create { create: "jepsencoll", capped: false, writeConcern: { w: "majority" }, $db: "jepsendb", lsid: { id: UUID("d1456bff-9d21-4d34-9130-4512722b3dda") } } numYields:0 ok:0 er
rMsg:"a collection 'jepsendb.jepsencoll' already exists" errName:NamespaceExists errCode:48 reslen:140 locks:{} protocol:op_msg 421969ms
2025-11-19T20:28:45.588+0800 I NETWORK [thread_group_2] Error sending response to client: SocketException: Broken pipe. Ending connection from 192.168.122.31:53016 (connection id: 243)
2025-11-19T20:28:45.588+0800 I NETWORK [thread_group_0] Error sending response to client: SocketException: Broken pipe. Ending connection from 192.168.122.31:41242 (connection id: 255)
2025-11-19T20:28:45.588+0800 I NETWORK [thread_group_2] end connection 192.168.122.31:53016 (241 connections now open)
2025-11-19T20:28:45.588+0800 I NETWORK [thread_group_0] end connection 192.168.122.31:41242 (240 connections now open)
2025-11-19T20:28:45.590+0800 I COMMAND [thread_group_0] command jepsendb.jepsencoll command: create { create: "jepsencoll", capped: false, writeConcern: { w: "majority" }, $db: "jepsendb", lsid: { id: UUID("eefbdf66-4651-4761-af1a-c1fcabb27a5e") } } numYields:0 ok:0 er
rMsg:"a collection 'jepsendb.jepsencoll' already exists" errName:NamespaceExists errCode:48 reslen:140 locks:{} protocol:op_msg 234865ms
2025-11-19T20:28:45.590+0800 I NETWORK [thread_group_0] end connection 192.168.122.31:54334 (239 connections now open)
2025-11-19T20:28:45.592+0800 I COMMAND [thread_group_2] command jepsendb.jepsencoll command: create { create: "jepsencoll", capped: false, writeConcern: { w: "majority" }, $db: "jepsendb", lsid: { id: UUID("58cc38ff-e769-41ae-a0cb-844223989452") } } numYields:0 ok:0 er
rMsg:"a collection 'jepsendb.jepsencoll' already exists" errName:NamespaceExists errCode:48 reslen:140 locks:{} protocol:op_msg 401925ms
2025-11-19T20:28:45.592+0800 I NETWORK [thread_group_2] Error sending response to client: SocketException: Broken pipe. Ending connection from 192.168.122.31:45706 (connection id: 259)
2025-11-19T20:28:45.592+0800 I NETWORK [thread_group_2] end connection 192.168.122.31:45706 (238 connections now open)
2025-11-19T20:28:45.593+0800 I COMMAND [thread_group_2] command jepsendb.jepsencoll command: create { create: "jepsencoll", capped: false, writeConcern: { w: "majority" }, $db: "jepsendb", lsid: { id: UUID("e6aa21a7-9800-40ac-9618-d639efd680f8") } } numYields:0 ok:0 er
rMsg:"a collection 'jepsendb.jepsencoll' already exists" errName:NamespaceExists errCode:48 reslen:140 locks:{} protocol:op_msg 348753ms
2025-11-19T20:28:45.593+0800 I NETWORK [thread_group_2] Error sending response to client: SocketException: Broken pipe. Ending connection from 192.168.122.31:47388 (connection id: 271)
2025-11-19T20:28:45.593+0800 I NETWORK [thread_group_2] end connection 192.168.122.31:47388 (237 connections now open)
2025-11-19T20:28:45.595+0800 I COMMAND [thread_group_2] command jepsendb.jepsencoll command: create { create: "jepsencoll", capped: false, writeConcern: { w: "majority" }, $db: "jepsendb", lsid: { id: UUID("aeccbf85-df96-4e2f-8afe-0d0a17db4278") } } numYields:0 ok:0 er
rMsg:"a collection 'jepsendb.jepsencoll' already exists" errName:NamespaceExists errCode:48 reslen:140 locks:{} protocol:op_msg 308652ms
2025-11-19T20:28:45.595+0800 I NETWORK [thread_group_2] end connection 192.168.122.31:37712 (236 connections now open)
2025-11-19T20:28:45.595+0800 F - [thread_group_1] Got signal: 11 (Segmentation fault).
0x7f5fc35d6de5 0x7f5fc35d6440 0x7f5fc35d6a04 0x7f5fc1920520 0x7f5fc1a77df9 0x7f5fc0bec8d0 0x7f5fc0be52fb 0x7f5fc0be6481 0x7f5fc0bea901 0x7f5fc112044a 0x7f5fc1120bf2 0x7f5fc1120e5d 0x7f5fbbca637c 0x7f5fbf2ff53d 0x7f5fbdea172c 0x7f5fbdea27b0 0x7f5fbdea3fb2 0x7f5fbdea4921
0x7f5fc17ec3d4 0x7f5fbfd109b6 0x7f5fbfd0ea55 0x7f5fbe7d724fcore stack:
(gdb) bt
#0 0x00007f5fc1a77df9 in ?? () from /mnt/ssd/eloq/jepsen-eloqdoc-test/eloqdoc-cloud/bin/../lib/libc.so.6
#1 0x00007f5fc0bec8d0 in std::char_traits<char>::compare (__n=<optimized out>, __s2=<optimized out>, __s1=<optimized out>) at /usr/include/c++/11/bits/char_traits.h:389
#2 std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::compare (this=0x330467527e0, __str=..., this=0x330467527e0, __str=...) at /usr/include/c++/11/bits/basic_string.h:2879
#3 std::operator< <char, std::char_traits<char>, std::allocator<char> > (__rhs=..., __lhs=...) at /usr/include/c++/11/bits/basic_string.h:6343
#4 std::less<void>::_S_cmp<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&> (__u=..., __t=...) at /usr/include/c++/11/bits/stl_function.h:615
#5 std::less<void>::operator()<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&> (__u=..., __t=..., this=<optimized out>)
at /usr/include/c++/11/bits/stl_function.h:600
#6 std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::unique_ptr<mongo::Collection, std::default_delete<mongo::Collection> > >, std::_Select1st<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::unique_ptr<mongo::Collection, std::default_delete<mongo::Collection> > > >, std::less<void>, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::unique_ptr<mongo::Collection, std::default_delete<mongo::Collection> > > > >::_M_lower_bound (this=0x3304618a8a8, __k=..., __y=0x3304618a8b0, __x=0x330467527c0) at /usr/include/c++/11/bits/stl_tree.h:1905
#7 std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::unique_ptr<mongo::Collection, std::default_delete<mongo::Collection> > >, std::_Select1st<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::unique_ptr<mongo::Collection, std::default_delete<mongo::Collection> > > >, std::less<void>, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::unique_ptr<mongo::Collection, std::default_delete<mongo::Collection> > > > >::find (this=this@entry=0x3304618a8a8, __k=...) at /usr/include/c++/11/bits/stl_tree.h:2523
#8 0x00007f5fc0be52fb in std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::unique_ptr<mongo::Collection, std::default_delete<mongo::Collection> >, std::less<void>, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::unique_ptr<mongo::Collection, std::default_delete<mongo::Collection> > > > >::find (__x=..., this=0x3304618a8a8) at /usr/include/c++/11/bits/stl_map.h:1170
#9 mongo::DatabaseImpl::getCollection (this=0x3304618a800, opCtx=0x33046072080, nss=..., isForWrite=<optimized out>) at src/mongo/db/catalog/database_impl.cpp:810
#10 0x00007f5fc0be6481 in mongo::DatabaseImpl::getCollection (this=0x3304618a800, opCtx=0x33046072080, ns=..., isForWrite=<optimized out>) at src/mongo/db/catalog/database_impl.cpp:789
#11 0x00007f5fc0bea901 in mongo::Database::getCollection (isForWrite=true, ns=..., opCtx=<optimized out>, this=0x3304675fda0) at src/mongo/db/catalog/database.h:336
#12 mongo::(anonymous namespace)::shim_namespace1541::Implementation::implementation (this=<optimized out>, opCtx=<optimized out>, db=0x3304675fda0, ns=..., collectionOptions=..., createDefaultIndexes=true, idIndex=...) at src/mongo/db/catalog/database_impl.cpp:1556
#13 0x00007f5fc112044a in _ZNK5mongo8Database13ShimBasis_149clIJRPNS_16OperationContextEPS0_RKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEENS_17CollectionOptionsERKbRKNS_7BSONObjEEEEDTclptclptclptL_ZN11shim_detail7storageIPNS1_17MongoShimImplGutsESt5tupleIJFNS_6StatusES4_S6_NS_10StringDataESF_bSK_ENSN_12AbiCheckTypeILb0EEENSN_13LibTUHookTypeILb1EEENSN_14ImplTUHookTypeILb0EEEEEE4dataEEL_ZNSN_3abiEPKSU_ELDnEEL_ZNSN_3libEPKSW_ELDnEEL_ZNSN_14implementationES4_S6_SR_SF_bSK_Espcl7forwardIT_Efp_EEEDpOS15_ (this=<optimized out>)
at src/mongo/db/catalog/database.h:149
#14 operator() (__closure=<optimized out>) at src/mongo/db/catalog/create_collection.cpp:118
#15 0x00007f5fc1120bf2 in mongo::writeConflictRetry<mongo::(anonymous namespace)::createCollection(mongo::OperationContext*, const mongo::NamespaceString&, const mongo::BSONObj&, const mongo::BSONObj&, mongo::CollectionOptions::ParseKind)::<lambda()> > (f=..., ns=...,
opStr=..., opCtx=0x33046072080) at src/mongo/db/concurrency/write_conflict_exception.h:91
#16 mongo::(anonymous namespace)::createCollection (opCtx=<optimized out>, nss=..., cmdObj=..., idIndex=..., kind=<optimized out>) at src/mongo/db/catalog/create_collection.cpp:128
#17 0x00007f5fc1120e5d in mongo::createCollection (opCtx=opCtx@entry=0x33046072080, dbName=..., cmdObj=..., idIndex=...) at src/mongo/db/catalog/create_collection.cpp:140
#18 0x00007f5fbbca637c in mongo::(anonymous namespace)::CmdCreate::run (this=<optimized out>, opCtx=0x33046072080, dbname=..., cmdObj=..., result=...) at src/mongo/db/commands/dbcommands.cpp:431
#19 0x00007f5fbf2ff53d in mongo::BasicCommand::Invocation::run (this=0x330461c9400, opCtx=0x33046072080, result=<optimized out>) at src/mongo/db/commands.cpp:449
#20 0x00007f5fbdea172c in mongo::(anonymous namespace)::runCommandImpl (opCtx=0x33046072080, invocation=0x330461c9400, request=..., replyBuilder=0x330469d47d0, startOperationTime=..., behaviors=..., extraFieldsBuilder=0x7f575665f460, sessionOptions=...,
atomicCmd=false) at src/mongo/db/service_entry_point_common.cpp:568
#21 0x00007f5fbdea27b0 in mongo::(anonymous namespace)::execCommandDatabase (opCtx=0x33046072080, command=0x7f5fbbd08780 <mongo::(anonymous namespace)::cmdCreate>, request=..., replyBuilder=0x330469d47d0, behaviors=...) at /usr/include/c++/11/bits/unique_ptr.h:173
#22 0x00007f5fbdea3fb2 in operator() (__closure=0x7f575665fa90) at src/mongo/db/service_entry_point_common.cpp:1069
#23 0x00007f5fbdea4921 in mongo::(anonymous namespace)::receivedCommands (behaviors=..., message=..., opCtx=0x33046072080) at src/mongo/db/service_entry_point_common.cpp:1017
#24 mongo::ServiceEntryPointCommon::handleRequest (opCtx=0x33046072080, m=..., behaviors=...) at src/mongo/db/service_entry_point_common.cpp:1390
#25 0x00007f5fc17ec3d4 in mongo::ServiceEntryPointMongod::handleRequest (this=<optimized out>, opCtx=<optimized out>, m=...) at src/mongo/db/service_entry_point_mongod.cpp:123
#26 0x00007f5fbfd109b6 in mongo::ServiceStateMachine::_processMessage (this=0x3304412a800, guard=...) at /usr/include/c++/11/bits/unique_ptr.h:173
#27 0x00007f5fbfd0ea55 in operator() (sink=..., __closure=<optimized out>) at src/mongo/transport/service_state_machine.cpp:141
#28 std::__invoke_impl<boost::context::continuation, mongo::ServiceStateMachine::_runNextInGuard(mongo::ServiceStateMachine::ThreadGuard)::<lambda(boost::context::continuation&&)>&, boost::context::continuation> (__f=...) at /usr/include/c++/11/bits/invoke.h:61
#29 std::__invoke<mongo::ServiceStateMachine::_runNextInGuard(mongo::ServiceStateMachine::ThreadGuard)::<lambda(boost::context::continuation&&)>&, boost::context::continuation> (__fn=...) at /usr/include/c++/11/bits/invoke.h:97
#30 std::invoke<mongo::ServiceStateMachine::_runNextInGuard(mongo::ServiceStateMachine::ThreadGuard)::<lambda(boost::context::continuation&&)>&, boost::context::continuation> (__fn=...) at /usr/include/c++/11/functional:98
#31 boost::context::detail::record<boost::context::continuation, mongo::ServiceStateMachine::NoopAllocator, mongo::ServiceStateMachine::_runNextInGuard(mongo::ServiceStateMachine::ThreadGuard)::<lambda(boost::context::continuation&&)> >::run (fctx=<optimized out>,
this=<optimized out>) at /usr/include/boost/context/continuation_fcontext.hpp:146
#32 boost::context::detail::context_entry<boost::context::detail::record<boost::context::continuation, mongo::ServiceStateMachine::NoopAllocator, mongo::ServiceStateMachine::_runNextInGuard(mongo::ServiceStateMachine::ThreadGuard)::<lambda(boost::context::continuation&&)> > >(boost::context::detail::transfer_t) (t=...) at /usr/include/boost/context/continuation_fcontext.hpp:80
#33 0x00007f5fbe7d724f in make_fcontext () from /mnt/ssd/eloq/jepsen-eloqdoc-test/eloqdoc-cloud/bin/../lib/libboost_context.so.1.74.0
#34 0x0000000000000000 in ?? ()
(gdb) f 9
#9 mongo::DatabaseImpl::getCollection (this=0x3304618a800, opCtx=0x33046072080, nss=..., isForWrite=<optimized out>) at src/mongo/db/catalog/database_impl.cpp:810
810 src/mongo/db/catalog/database_impl.cpp: No such file or directory.
(gdb) info local
it = <optimized out>
exists = true
version = {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x330460e9ea0 "be5bffd7-f8ef-431b-a4c1-4729fa5c8cb3"}, _M_string_length = 36, {
_M_local_buf = "$\000\000\000\000\000\000\000\000\201\005\302\033\344\311", <incomplete sequence \306>, _M_allocated_capacity = 36}}
status = {_error = 0x0}
(gdb) p nss
$1 = (const mongo::NamespaceString &) @0x7f575665e6d0: {static kAdminDb = {_data = 0x7f5fc0ed9855 "admin", _size = 5}, static kLocalDb = {_data = 0x7f5fc0c0c415 "local", _size = 5}, static kConfigDb = {_data = 0x7f5fc0c0c6bf "config", _size = 6},
static kSystemDotViewsCollectionName = {_data = 0x7f5fc0c0c8c7 "system.views", _size = 12}, static kSystemKeysNamespace = {static kAdminDb = <same as static member of an already seen type>, static kLocalDb = <same as static member of an already seen type>,
static kConfigDb = <same as static member of an already seen type>, static kSystemDotViewsCollectionName = <same as static member of an already seen type>, static kOrphanCollectionPrefix = {_data = 0x7f5fbeda2fdc "orphan.", _size = 7},
static kOrphanCollectionDb = {_data = 0x7f5fbeda2f6c "local", _size = 5}, static kServerConfigurationNamespace = {static kAdminDb = <same as static member of an already seen type>, static kLocalDb = <same as static member of an already seen type>,
static kConfigDb = <same as static member of an already seen type>, static kSystemDotViewsCollectionName = <same as static member of an already seen type>, static kOrphanCollectionPrefix = <same as static member of an already seen type>,
static kOrphanCollectionDb = <same as static member of an already seen type>, static kServerConfigurationNamespace = <same as static member of an already seen type>, static kSessionTransactionsTableNamespace = {
static kAdminDb = <same as static member of an already seen type>, static kLocalDb = <same as static member of an already seen type>, static kConfigDb = <same as static member of an already seen type>,
static kSystemDotViewsCollectionName = <same as static member of an already seen type>, static kOrphanCollectionPrefix = <same as static member of an already seen type>, static kOrphanCollectionDb = <same as static member of an already seen type>,
static kServerConfigurationNamespace = <same as static member of an already seen type>, static kSessionTransactionsTableNamespace = <same as static member of an already seen type>, static kShardConfigCollectionsNamespace = {
static kAdminDb = <same as static member of an already seen type>, static kLocalDb = <same as static member of an already seen type>, static kConfigDb = <same as static member of an already seen type>,
static kSystemDotViewsCollectionName = <same as static member of an already seen type>, static kOrphanCollectionPrefix = <same as static member of an already seen type>, static kOrphanCollectionDb = <same as static member of an already seen type>,
static kServerConfigurationNamespace = <same as static member of an already seen type>, static kSessionTransactionsTableNamespace = <same as static member of an already seen type>,
static kShardConfigCollectionsNamespace = <same as static member of an already seen type>, static kShardConfigDatabasesNamespace = {static kAdminDb = <same as static member of an already seen type>,
static kLocalDb = <same as static member of an already seen type>, static kConfigDb = <same as static member of an already seen type>, static kSystemDotViewsCollectionName = <same as static member of an already seen type>,
static kOrphanCollectionPrefix = <same as static member of an already seen type>, static kOrphanCollectionDb = <same as static member of an already seen type>, static kServerConfigurationNamespace = <same as static member of an already seen type>,
static kSessionTransactionsTableNamespace = <same as static member of an already seen type>, static kShardConfigCollectionsNamespace = <same as static member of an already seen type>,
static kShardConfigDatabasesNamespace = <same as static member of an already seen type>, static kSystemKeysNamespace = <same as static member of an already seen type>, static kRsOplogNamespace = {
static kAdminDb = <same as static member of an already seen type>, static kLocalDb = <same as static member of an already seen type>, static kConfigDb = <same as static member of an already seen type>,
static kSystemDotViewsCollectionName = <same as static member of an already seen type>, static kOrphanCollectionPrefix = <same as static member of an already seen type>, static kOrphanCollectionDb = <same as static member of an already seen type>,
static kServerConfigurationNamespace = <same as static member of an already seen type>, static kSessionTransactionsTableNamespace = <same as static member of an already seen type>,
static kShardConfigCollectionsNamespace = <same as static member of an already seen type>, static kShardConfigDatabasesNamespace = <same as static member of an already seen type>,
static kSystemKeysNamespace = <same as static member of an already seen type>, static kRsOplogNamespace = <same as static member of an already seen type>, _ns = {static npos = 18446744073709551615,
_M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x7f5fbeda6050 <mongo::NamespaceString::kRsOplogNamespace+16> "local.oplog.rs"}, _M_string_length = 14, {
_M_local_buf = "local.oplog.rs\000", _M_allocated_capacity = 8101745297688063852}}, _dotIndex = 5}, _ns = {static npos = 18446744073709551615,
_M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x32fae0544c0 "config.cache.databases"}, _M_string_length = 22, {_M_local_buf = "\026", '\000' <repeats 14 times>,
_M_allocated_capacity = 22}}, _dotIndex = 6}, static kSystemKeysNamespace = <same as static member of an already seen type>, static kRsOplogNamespace = <same as static member of an already seen type>, _ns = {static npos = 18446744073709551615,
_M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x32fae0544a0 "config.cache.collections"}, _M_string_length = 24, {_M_local_buf = "\030", '\000' <repeats 14 times>,
_M_allocated_capacity = 24}}, _dotIndex = 6}, static kShardConfigDatabasesNamespace = <same as static member of an already seen type>, static kSystemKeysNamespace = <same as static member of an already seen type>,
static kRsOplogNamespace = <same as static member of an already seen type>, _ns = {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>},
_M_p = 0x32fae054480 "config.transactions"}, _M_string_length = 19, {_M_local_buf = "\023", '\000' <repeats 14 times>, _M_allocated_capacity = 19}}, _dotIndex = 6}, static kShardConfigCollectionsNamespace = <same as static member of an already seen type>,
static kShardConfigDatabasesNamespace = <same as static member of an already seen type>, static kSystemKeysNamespace = <same as static member of an already seen type>, static kRsOplogNamespace = <same as static member of an already seen type>, _ns = {
static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x32fae054460 "admin.system.version"}, _M_string_length = 20, {
_M_local_buf = "\024", '\000' <repeats 14 times>, _M_allocated_capacity = 20}}, _dotIndex = 5}, static kSessionTransactionsTableNamespace = <same as static member of an already seen type>,
static kShardConfigCollectionsNamespace = <same as static member of an already seen type>, static kShardConfigDatabasesNamespace = <same as static member of an already seen type>, static kSystemKeysNamespace = <same as static member of an already seen type>,
static kRsOplogNamespace = <same as static member of an already seen type>, _ns = {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>},
_M_p = 0x32fae0544e0 "admin.system.keys"}, _M_string_length = 17, {_M_local_buf = "\021", '\000' <repeats 14 times>, _M_allocated_capacity = 17}}, _dotIndex = 5}, _ns = {static npos = 18446744073709551615,
_M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x33046757f40 "jepsendb.jepsencoll"}, _M_string_length = 19, {_M_local_buf = "\023\000\000\000\000\000\000\000 \347eVW\177\000",
_M_allocated_capacity = 19}}, _dotIndex = 8}
(gdb) p this->_collections
$2 = {_M_t = {
_M_impl = {<std::allocator<std::_Rb_tree_node<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::unique_ptr<mongo::Collection, std::default_delete<mongo::Collection> > > > >> = {<__gnu_cxx::new_allocator<std::_Rb_tree_node<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::unique_ptr<mongo::Collection, std::default_delete<mongo::Collection> > > > >> = {<No data fields>}, <No data fields>}, <std::_Rb_tree_key_compare<std::less<void> >> = {_M_key_compare = {<No data fields>}}, <std::_Rb_tree_header> = {_M_header = {_M_color = (unknown: 0x37200000), _M_parent = 0x330467527c0, _M_left = 0x1e, _M_right = 0x1e}, _M_node_count = 2322289995469254255}, <No data fields>}}}
(gdb) f 3
#3 std::operator< <char, std::char_traits<char>, std::allocator<char> > (__rhs=..., __lhs=...) at /usr/include/c++/11/bits/basic_string.h:6343
6343 { return __lhs.compare(__rhs) < 0; }
(gdb) p __lhs
$3 = (const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > &) @0x330467527e0: {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>},
_M_p = 0x315f44495f575f53 <error: Cannot access memory at address 0x315f44495f575f53>}, _M_string_length = 6864692405621183327, {_M_local_buf = "1_S_QUANTITY_1\000", _M_allocated_capacity = 5638882016424582961}}
(gdb) p __rhs
$4 = (const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > &) @0x3304618a8b0: {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>},
_M_p = 0x202c333637200000 <error: Cannot access memory at address 0x202c333637200000>}, _M_string_length = 3505875396544, {_M_local_buf = "\036\000\000\000\000\000\000\000\036\000\000\000\000\000\000", _M_allocated_capacity = 30}}
(gdb)