#0  0x00000000008efce0 in pread_bin_internal (max_header_size=0, ret_ptr=0x7f88fe7e9ba8, pos=<optimized out>, file=0x7f88d588ec60)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/couch_file_read.cc:185
185	/home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/couch_file_read.cc: No such file or directory.
warning: File "/opt/couchbase/lib/libstdc++.so.6.0.28-gdb.py" auto-loading has been declined by your `auto-load safe-path' set to "$debugdir:$datadir/auto-load:/usr/bin/mono-gdb.py".
Missing separate debuginfos, use: debuginfo-install glibc-2.17-260.el7_6.3.x86_64
(gdb) bt full
#0  0x00000000008efce0 in pread_bin_internal (max_header_size=0, ret_ptr=0x7f88fe7e9ba8, pos=<optimized out>, file=0x7f88d588ec60)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/couch_file_read.cc:185
        info = {chunk_len = 61, crc32 = 2536876271}
        err = COUCHSTORE_SUCCESS
        buf = 0x7f88d54942c0 <Address 0x7f88d54942c0 out of bounds>
#1  pread_bin (file=file@entry=0x7f88d588ec60, pos=<optimized out>, ret_ptr=ret_ptr@entry=0x7f88fe7e9ba8)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/couch_file_read.cc:239
No locals.
#2  0x00000000008e8669 in bp_to_doc (options=<optimized out>, bp=<optimized out>, db=0x7f88d588ec60, pDoc=0x7f88fe7e9c60)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/couch_db.cc:850
        bodylen = 0
        errcode = COUCHSTORE_SUCCESS
        docbody = 0x0
        docbuf = 0x0
#3  couchstore_open_doc_with_docinfo () at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/couch_db.cc:996
        CL_item = {_M_t = {<std::__uniq_ptr_impl<CouchLatencyItem, std::default_delete<CouchLatencyItem> >> = {
              _M_t = {<std::_Tuple_impl<0, CouchLatencyItem*, std::default_delete<CouchLatencyItem> >> = {<std::_Tuple_impl<1, std::default_delete<CouchLatencyItem> >> = {<std::_Head_base<1, std::default_delete<CouchLatencyItem>, true>> = {<std::default_delete<CouchLatencyItem>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0, CouchLatencyItem*, false>> = {
                    _M_head_impl = 0x0}, <No data fields>}, <No data fields>}}, <No data fields>}}
        CL_item_ptr = {value = {_M_b = {_M_p = 0x0}, static is_always_lock_free = <optimized out>}}
        CL_lat_collector = <optimized out>
        CL_timer = {blockTimer = {dest = 0x0, start = {__d = {__r = 0}}, name = 0x0, out = 0x0}}
        errcode = <optimized out>
#4  0x000000000082ef9f in bySeqnoScanCallback(Db*, DocInfo*, void*) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/couch-kvstore/couch-kvstore.cc:2740
        openOptions = 0
        errCode = <optimized out>
        sctx = 0x7f88d5874380
        cb = @0x7f88d564aec0: <error reading variable>
        cl = <optimized out>
        doc = 0x0
        byseqno = 52
        vbucketId = {vbid = 502}
        key = <optimized out>
        diskKey = {keydata = {static npos = 18446744073709551615, 
            _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
              _M_p = 0x7f88fe7e9ce0 "\001"}, _M_string_length = 14, {_M_local_buf = "\001\000\032_collection\000", 
              _M_allocated_capacity = 7812741926168952833}}}
        docKey = {<DocKeyInterface<DocKey>> = {<No data fields>}, buffer = {static npos = <optimized out>, buf = 0x7f88fe7e9ce0 "\001", len = 14}, 
          encoding = Yes}
---Type <return> to continue, or q <return> to quit---
        metadata = {_M_t = {<std::__uniq_ptr_impl<MetaData, std::default_delete<MetaData> >> = {
              _M_t = {<std::_Tuple_impl<0, MetaData*, std::default_delete<MetaData> >> = {<std::_Tuple_impl<1, std::default_delete<MetaData> >> = {<std::_Head_base<1, std::default_delete<MetaData>, true>> = {<std::default_delete<MetaData>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0, MetaData*, false>> = {_M_head_impl = 0x7f88d584b000}, <No data fields>}, <No data fields>}}, <No data fields>}}
        fetchCompressed = <optimized out>
        keysOnly = <optimized out>
        isSystemEvent = <optimized out>
        it = {_M_t = {<std::__uniq_ptr_impl<Item, std::default_delete<Item> >> = {
              _M_t = {<std::_Tuple_impl<0, Item*, std::default_delete<Item> >> = {<std::_Tuple_impl<1, std::default_delete<Item> >> = {<std::_Head_base<1, std::default_delete<Item>, true>> = {<std::default_delete<Item>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0, Item*, false>> = {_M_head_impl = 0x0}, <No data fields>}, <No data fields>}}, <No data fields>}}
        rv = {item = {_M_t = {<std::__uniq_ptr_impl<Item, std::default_delete<Item> >> = {
                _M_t = {<std::_Tuple_impl<0, Item*, std::default_delete<Item> >> = {<std::_Tuple_impl<1, std::default_delete<Item> >> = {<std::_Head_base<1, std::default_delete<Item>, true>> = {<std::default_delete<Item>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0, Item*, false>> = {_M_head_impl = 0x7f88fe7e9d00}, <No data fields>}, <No data fields>}}, <No data fields>}}, id = 14, status = 1595539457, partial = 99}
#5  0x00000000008e7519 in lookup_callback (rq=<optimized out>, k=0x7f88fe7e9df0, v=0x7f88fe7e9e00)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/couch_db.cc:1095
        context = 0x7f88fe7e9f60
        docinfo = 0x7f88d5868ff0
        errcode = <optimized out>
#6  0x00000000008fc349 in btree_lookup_inner(couchfile_lookup_request*, unsigned long, int, int) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/btree_read.cc:122
        errcode_local = <optimized out>
        cmp_val = <optimized out>
        cmp_key = {buf = 0x7f88d597d8fa <Address 0x7f88d597d8fa out of bounds>, size = 6}
        val_buf = {buf = 0x7f88d597d900 <Address 0x7f88d597d900 out of bounds>, size = 50}
        next_key = <optimized out>
        bufpos = 306
        nodebuflen = 1160
        errcode = COUCHSTORE_SUCCESS
        nodebuf = 0x7f88d597d800 <Address 0x7f88d597d800 out of bounds>
#7  0x00000000008fc04e in btree_lookup_inner(couchfile_lookup_request*, unsigned long, int, int) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/btree_read.cc:75
        pointer = <optimized out>
        last_item = <optimized out>
        raw = <optimized out>
        errcode_local = <optimized out>
        cmp_key = {buf = 0x7f88d54b0360 <Address 0x7f88d54b0360 out of bounds>, size = 6}
        val_buf = {buf = 0x7f88d54b0366 <Address 0x7f88d54b0366 out of bounds>, size = 19}
        bufpos = 121
        nodebuflen = 121
---Type <return> to continue, or q <return> to quit---
        errcode = COUCHSTORE_SUCCESS
        nodebuf = 0x7f88d54b0300 <Address 0x7f88d54b0300 out of bounds>
#8  0x00000000008fc4b1 in btree_lookup (rq=rq@entry=0x7f88fe7e9f90, root_pointer=<optimized out>)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/btree_read.cc:162
No locals.
#9  0x00000000008e9726 in couchstore_changes_since () at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/couch_db.cc:1148
        CL_item = {_M_t = {<std::__uniq_ptr_impl<CouchLatencyItem, std::default_delete<CouchLatencyItem> >> = {
              _M_t = {<std::_Tuple_impl<0, CouchLatencyItem*, std::default_delete<CouchLatencyItem> >> = {<std::_Tuple_impl<1, std::default_delete<CouchLatencyItem> >> = {<std::_Head_base<1, std::default_delete<CouchLatencyItem>, true>> = {<std::default_delete<CouchLatencyItem>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0, CouchLatencyItem*, false>> = {
                    _M_head_impl = 0x0}, <No data fields>}, <No data fields>}}, <No data fields>}}
        CL_item_ptr = {value = {_M_b = {_M_p = 0x0}, static is_always_lock_free = <optimized out>}}
        CL_lat_collector = <optimized out>
        CL_timer = {blockTimer = {dest = 0x0, start = {__d = {__r = 0}}, name = 0x0, out = 0x0}}
        since_termbuf = "\000\000\000\000\000\001"
        since_term = {buf = 0x7f88fe7e9f22 "", size = 6}
        keylist = 0x7f88fe7e9f30
        cbctx = {db = 0x7f88d588ec60, options = 0, callback = 0x82ec10 <bySeqnoScanCallback(Db*, DocInfo*, void*)>, callback_context = 0x7f88d5874380, 
          tree = lookup_context::BySeqno, depth = 0, walk_callback = 0x0}
        rq = {cmp = {compare = 0x8f89d0 <seq_cmp(sized_buf const*, sized_buf const*)>}, file = 0x7f88d588ec60, num_keys = 1, fold = 1, in_fold = 1, 
          tolerate_corruption = 0, keys = 0x7f88fe7e9f28, callback_ctx = 0x7f88fe7e9f60, 
          fetch_callback = 0x8e73a0 <lookup_callback(couchfile_lookup_request*, sized_buf const*, sized_buf const*)>, node_callback = 0x0}
#10 0x000000000082d8c1 in CouchKVStore::scan(BySeqnoScanContext&) ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/couch-kvstore/couch-kvstore-db-holder.h:50
        phosphor_internal_category_enabled_2245 = {_M_b = {_M_p = 0x0}, static is_always_lock_free = <optimized out>}
        phosphor_internal_category_enabled_temp_2245 = <optimized out>
        phosphor_internal_tpi_2245 = {category = 0x0, name = 0x0, type = phosphor::AsyncStart, argument_names = {_M_elems = {0x0, 0x0}}, 
          argument_types = {_M_elems = {phosphor::is_bool, phosphor::is_bool}}}
        couchKvHandle = @0x7f88d564a860: <error reading variable>
        db = @0x7f88d564a868: <error reading variable>
        start = <optimized out>
        errorCode = <optimized out>
        phosphor_internal_category_enabled_2267 = {_M_b = {_M_p = 0x0}, static is_always_lock_free = <optimized out>}
        phosphor_internal_category_enabled_temp_2267 = <optimized out>
        phosphor_internal_tpi_2267 = {category = 0x0, name = 0x0, type = phosphor::AsyncStart, argument_names = {_M_elems = {0x0, 0x0}}, 
          argument_types = {_M_elems = {phosphor::is_bool, phosphor::is_bool}}}

#11 0x000000000088a933 in DCPBackfillBySeqnoDisk::scan() ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/backfill_by_seqno_disk.cc:180
        stream = {<std::__shared_ptr<ActiveStream, (__gnu_cxx::_Lock_policy)2>> = {<std::__shared_ptr_access<ActiveStream, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, _M_ptr = <optimized out>, _M_refcount = {_M_pi = 0x7f88d59f4a80}}, <No data fields>}
        vbid = {vbid = 502}
---Type <return> to continue, or q <return> to quit---
        kvstore = <optimized out>
        error = <optimized out>
#12 0x000000000088d54a in DCPBackfillDisk::run() ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/backfill_disk.cc:134
        lh = {_M_device = @0x7f88d555d408}
#13 0x000000000088f891 in BackfillManager::backfill() ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/backfill-manager.cc:332
        lh = {_M_device = <optimized out>, _M_owns = false}
        backfill = {_M_t = {<std::__uniq_ptr_impl<DCPBackfillIface, std::default_delete<DCPBackfillIface> >> = {
              _M_t = {<std::_Tuple_impl<0, DCPBackfillIface*, std::default_delete<DCPBackfillIface> >> = {<std::_Tuple_impl<1, std::default_delete<DCPBackfillIface> >> = {<std::_Head_base<1, std::default_delete<DCPBackfillIface>, true>> = {<std::default_delete<DCPBackfillIface>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0, DCPBackfillIface*, false>> = {
                    _M_head_impl = 0x7f88d555d460}, <No data fields>}, <No data fields>}}, <No data fields>}}
        source = BackfillManager::Active
        status = <optimized out>
#14 0x000000000088fb04 in BackfillManagerTask::run() ()
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/dcp/backfill-manager.cc:70
        phosphor_internal_category_enabled_59 = {_M_b = {_M_p = 0x0}, static is_always_lock_free = <optimized out>}
        phosphor_internal_category_enabled_temp_59 = <optimized out>
        phosphor_internal_tpi_59 = {category = 0x0, name = 0x0, type = phosphor::AsyncStart, argument_names = {_M_elems = {0x0, 0x0}}, 
          argument_types = {_M_elems = {phosphor::is_bool, phosphor::is_bool}}}
        phosphor_internal_guard_59 = {tpi = 0xf06f40 <BackfillManagerTask::run()::phosphor_internal_tpi_59>, enabled = true, 
          arg1 = {<No data fields>}, arg2 = {<No data fields>}, start = {__d = {__r = 10442337926505327}}}
        manager = {<std::__shared_ptr<BackfillManager, (__gnu_cxx::_Lock_policy)2>> = {<std::__shared_ptr_access<BackfillManager, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, _M_ptr = <optimized out>, _M_refcount = {_M_pi = 0x7f88d57ba780}}, <No data fields>}
        status = <optimized out>
#15 0x000000000069bee7 in GlobalTask::execute() () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/globaltask.cc:68
        guard = {previous = 0x0}
#16 0x0000000000697030 in FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#1}::operator()() const (__closure=0x7f88fe7ea630)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/folly_executorpool.cc:190
        proxy = @0x7f8954356150: <error reading variable>
#17 0x0000000000ad7290 in operator() (this=0x7f88fe7ea630)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:416
        fn = @0x7f88fe7ea630: {<folly::detail::function::FunctionTraits<void()>> = {<No data fields>}, data_ = {big = 0x7f8954356150, tiny = {
              __data = "Pa5T\211\177\000\000\000\000\000\000\000\000\000\000Pa5T\211\177\000\000WN\001\000\000\000\000\000`\000\000\000\000\000\000\000\000\247~\376\210\177\000", __align = {<No data fields>}}}, 
          call_ = 0x6977c0 <folly::detail::function::FunctionTraits<void ()>::callSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#1}>(folly::detail::function::Data&)>, 
          exec_ = 0x694580 <folly::detail::function::execSmall<FollyExecutorPool::TaskProxy::scheduleViaCPUPool()::{lambda()#1}>(folly::detail::function::Op, folly::detail::function::Data*, folly::detail::function::Data)>}
#18 folly::ThreadPoolExecutor::runTask(std::shared_ptr<folly::ThreadPoolExecutor::Thread> const&, folly::ThreadPoolExecutor::Task&&) (
---Type <return> to continue, or q <return> to quit---
    this=0x7f895454b800, thread=..., task=<unknown type in /usr/lib/debug/opt/couchbase/bin/memcached.debug, CU 0x82da4ea, DIE 0x8320944>)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/ThreadPoolExecutor.cpp:97
        rctx = {
          prev_ = {<std::__shared_ptr<folly::RequestContext, (__gnu_cxx::_Lock_policy)2>> = {<std::__shared_ptr_access<folly::RequestContext, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, _M_ptr = 0x0, _M_refcount = {_M_pi = 0x0}}, <No data fields>}}
        startTime = {__d = {__r = 10442337926501939}}
        stats = {expired = false, waitTime = {__r = 9692}, runTime = {__r = 0}, enqueueTime = {__d = {__r = 10442337926492247}}, requestId = 0}
#19 0x0000000000abef6a in folly::CPUThreadPoolExecutor::threadRun (this=0x7f895454b800, thread=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/executors/CPUThreadPoolExecutor.cpp:265
        guard = {list_ = {forbid = true, prev = 0x0, curr = {name = {static npos = <optimized out>, b_ = 0xb6fa5b "CPUThreadPoolExecutor", 
                e_ = 0xb6fa70 ""}}}}
#20 0x0000000000ada249 in __invoke_impl<void, void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__t=<optimized out>, __f=<optimized out>)
    at /usr/local/include/c++/7.3.0/bits/invoke.h:73
No locals.
#21 __invoke<void (folly::ThreadPoolExecutor::*&)(std::shared_ptr<folly::ThreadPoolExecutor::Thread>), folly::ThreadPoolExecutor*&, std::shared_ptr<folly::ThreadPoolExecutor::Thread>&> (__fn=<optimized out>) at /usr/local/include/c++/7.3.0/bits/invoke.h:95
No locals.
#22 __call<void, 0, 1> (__args=<optimized out>, this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:467
No locals.
#23 operator()<> (this=<optimized out>) at /usr/local/include/c++/7.3.0/functional:551
No locals.
#24 folly::detail::function::FunctionTraits<void ()>::callBig<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)> >(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/cbdeps-platform-build-old/deps/packages/build/folly/folly-prefix/src/folly/folly/Function.h:401
        fn = <optimized out>
#25 0x00000000006955bd in folly::detail::function::FunctionTraits<void ()>::callBig<CBRegisteredThreadFactory::newThread(folly::Function<void ()>&&)::{lambda()#1}>(folly::detail::function::Data&) (p=...)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/folly_executorpool.cc:48
        fn = @0x7f89482eb440: <error reading variable>
#26 0x00007f895643cd40 in execute_native_thread_routine () at /tmp/deploy/objdir/../gcc-10.2.0/libstdc++-v3/src/c++11/thread.cc:80
No locals.
#27 0x00007f8955c40dd5 in start_thread () from /lib64/libpthread.so.0
No symbol table info available.
#28 0x00007f8955969ead in clone () from /lib64/libc.so.6
No symbol table info available.