(gdb) bt full
#0  0x00007f124fa19337 in __bsd_signal (sig=113561, handler=0x1bbb3) at ../sysdeps/posix/signal.c:50
        act = {__sigaction_handler = {sa_handler = 0x7f1213ff4090, sa_sigaction = 0x7f1213ff4090}, sa_mask = {__val = {4478999, 5893488, 0, 5893488, 0, 5893488, 0, 139716615274968, 139715286138885, 1592140615516212433, 113587, 5796648, 
              139716622887385, 0, 139716622406163, 7022344672792685098}}, sa_flags = 22943632, sa_restorer = 0x468}
        oact = {__sigaction_handler = {sa_handler = 0x7f124fda7380 <__GI__IO_file_jumps>, sa_sigaction = 0x7f124fda7380 <__GI__IO_file_jumps>}, sa_mask = {__val = {139716622412334, 1431655764, 1179670597, 685, 139715621680896, 0, 
              139716622420693, 0, 0, 0, 139716622948441, 4611686018427387904, 0, 0, 139715017705760, 139716637076184}}, sa_flags = 1347986672, sa_restorer = 0x7f1213ff4050}
#1  0x00007f124fa1aa28 in __GI_abort () at abort.c:79
        act = {__sigaction_handler = {sa_handler = 0x1d, sa_sigaction = 0x1d}, sa_mask = {__val = {29, 139716634716582, 139716622408368, 29, 0, 0, 139716625871296, 29, 1, 29, 139716634716582, 139716625855360, 139716622362370, 0, 
              139715017705760, 139716637076184}}, sa_flags = 1347986672, sa_restorer = 0x7f1213ff4050}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f125057715d in __gnu_cxx::__verbose_terminate_handler () at /tmp/deploy/gcc-7.3.0/libstdc++-v3/libsupc++/vterminate.cc:50
        terminating = false
        t = <optimized out>
#3  0x000000000054c032 in backtrace_terminate_handler () at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/utilities/terminate_handler.cc:86
No locals.
#4  0x00007f1250574f86 in __cxxabiv1::__terminate (handler=<optimized out>) at /tmp/deploy/gcc-7.3.0/libstdc++-v3/libsupc++/eh_terminate.cc:47
No locals.
#5  0x00007f1250574fd1 in std::terminate () at /tmp/deploy/gcc-7.3.0/libstdc++-v3/libsupc++/eh_terminate.cc:57
No locals.
#6  0x00007f1250575213 in __cxxabiv1::__cxa_throw (obj=obj@entry=0x7f11f0000940, tinfo=0x7f125085aad8 <typeinfo for std::underflow_error>, dest=0x7f125058a4f0 <std::underflow_error::~underflow_error()>)
    at /tmp/deploy/gcc-7.3.0/libstdc++-v3/libsupc++/eh_throw.cc:93
        globals = <optimized out>
        header = 0x7f11f00008c0
#7  0x00007f1253c88344 in cb::ThrowExceptionUnderflowPolicy<unsigned long>::underflow (this=<optimized out>, desired=<optimized out>, current=<optimized out>, arg=<optimized out>)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/include/platform/non_negative_counter.h:48
No locals.
#8  0x00007f1253e5c06e in fetch_add (arg=-91, this=<optimized out>) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/include/platform/non_negative_counter.h:125
        current = <optimized out>
        desired = 18446744073709551525
#9  operator+= (rhs=18446744073709551525, this=<optimized out>) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/include/platform/non_negative_counter.h:182
No locals.
#10 updateDiskSize (delta=-91, this=<optimized out>) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/collections/vbucket_manifest_entry.h:107
No locals.
#11 updateDiskSize (delta=-91, entry=..., this=<optimized out>) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/collections/vbucket_manifest.h:1055
No locals.
#12 updateDiskSize (delta=-91, this=0x7f1213ff4110) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/collections/vbucket_manifest.h:393
No locals.
#13 Collections::VB::Flush::updateDiskSize (this=<optimized out>, key=..., delta=-91) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/collections/flush.cc:58
No locals.
#14 0x00007f1253e23952 in saveDocsCallback (oldInfo=0x7f11f5e70a40, newInfo=0x7f11f5e70ab0, context=0x7f1213ff4a30) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/couch-kvstore/couch-kvstore.cc:2113
        cbCtx = 0x7f1213ff4a30
        newKey = {keydata = {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
              _M_p = 0x7f11f60e57a0 <Address 0x7f11f60e57a0 out of bounds>}, _M_string_length = 22, {_M_local_buf = "\026\000\000\000\000\000\000\000\022\000\000\000\000\000\000", _M_allocated_capacity = 22}}}
        onDiskMutationType = <optimized out>
        docKey = {<DocKeyInterface<DocKey>> = {<No data fields>}, buffer = {static npos = <optimized out>, buf = 0x7f11f60e57a0 <Address 0x7f11f60e57a0 out of bounds>, len = 22}, encoding = Yes}
        oldSize = <optimized out>
        newSize = <optimized out>
        delta = <optimized out>
#15 0x00007f12539dea5b in do_save_callback (valueNew=<optimized out>, valueOld=0x7f1213ff42c0, key=0x7f11f61600f0, rq=0x7f1213ff4630) at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/btree_modify.cc:431
        infoNew = 0x7f11f5e70ab0
        infoOld = 0x7f11f5e70a40
#16 modify_node (rq=rq@entry=0x7f1213ff4630, nptr=nptr@entry=0x7f1201879338, start=start@entry=14, end=end@entry=18, dst=dst@entry=0x7f12018781b0)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/btree_modify.cc:537
        cmp_val = <optimized out>
        cmp_key = {buf = 0x7f12408a1706 <Address 0x7f12408a1706 out of bounds>, size = 22}
        val_buf = {buf = 0x7f12408a171c <Address 0x7f12408a171c out of bounds>, size = 41}
        advance = 1
        nodebuf = 0x7f12408a1700 <Address 0x7f12408a1700 out of bounds>
        bufpos = 69
        nodebuflen = 749
        errcode = <optimized out>
        local_result = 0x7f1201879368
---Type <return> to continue, or q <return> to quit---
#17 0x00007f12539de431 in modify_node (rq=rq@entry=0x7f1213ff4630, nptr=nptr@entry=0x7f1201878180, start=14, start@entry=0, end=end@entry=27, dst=dst@entry=0x7f12018780c8)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/btree_modify.cc:647
        range_end = 18
        cmp_key = {buf = 0x7f124089fae9 <Address 0x7f124089fae9 out of bounds>, size = 22}
        val_buf = {buf = 0x7f124089faff <Address 0x7f124089faff out of bounds>, size = 30}
        cmp_val = <optimized out>
        nodebuf = 0x7f124089f900 <Address 0x7f124089f900 out of bounds>
        bufpos = 541
        nodebuflen = 714
        errcode = <optimized out>
        local_result = 0x7f12018781b0
#18 0x00007f12539de431 in modify_node (rq=rq@entry=0x7f1213ff4630, nptr=nptr@entry=0x7f123befcbc0, start=start@entry=0, end=256, dst=dst@entry=0x7f1201878010)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/btree_modify.cc:647
        range_end = 27
        cmp_key = {buf = 0x7f121173e786 <Address 0x7f121173e786 out of bounds>, size = 23}
        val_buf = {buf = 0x7f121173e79d <Address 0x7f121173e79d out of bounds>, size = 30}
        cmp_val = <optimized out>
        nodebuf = 0x7f121173e780 <Address 0x7f121173e780 out of bounds>
        bufpos = 59
        nodebuflen = 522
        errcode = <optimized out>
        local_result = 0x7f12018780c8
#19 0x00007f12539df3c9 in modify_btree (rq=rq@entry=0x7f1213ff4630, root=0x7f123befcbc0, errcode=errcode@entry=0x7f1213ff4564) at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/btree_modify.cc:809
        a = 0x7f1211645a40
        ret_ptr = 0x7f123befcbc0
#20 0x00007f12539f3490 in update_indexes (save_callback_ctx=<optimized out>, save_callback=<optimized out>, numdocs=<optimized out>, idvals=<optimized out>, ids=<optimized out>, seqvals=<optimized out>, seqs=0x7f11f615f010, 
    db=<optimized out>, this=<optimized out>, this=<optimized out>) at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/couch_save.cc:238
        size = 70
        seqrq = {cmp = {compare = 0x7f1213ff46e4}, file = 0x7f1251a84c6e <arena_bin_malloc_hard+798>, num_actions = 1092654648, actions = 0x1, fetch_callback = 0x18, fetch_callback_ctx = 0x7f12412008c0, 
          reduce = 0x7f1251d2b480 <je_bin_infos+960>, rereduce = 0x7f1251a84cf4 <arena_bin_malloc_hard+932>, user_reduce_ctx = 0x7f1251f36118 <je_tcache_bin_info>, purge_kp = 0x7f1213ff5a90, purge_kv = 0x7f1241336f80, 
          enable_purging = 1082984448, guided_purge_ctx = 0x7f12408d0ba8, compacting = 138, kv_chunk_threshold = 0, kp_chunk_threshold = 335497264, save_callback = 0x1, save_callback_ctx = 0x7f1213ff49b0, 
          docinfo_callback = 0x7f12408d0800}
        errcode = 32530
        new_id_root = <optimized out>
        actbuf = {_M_t = {
            _M_t = {<std::_Tuple_impl<0, fatbuf*, cb::couchstore::FatbufDeletor>> = {<std::_Tuple_impl<1, cb::couchstore::FatbufDeletor>> = {<std::_Head_base<1, cb::couchstore::FatbufDeletor, true>> = {<cb::couchstore::FatbufDeletor> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0, fatbuf*, false>> = {_M_head_impl = 0x7f11f616b000}, <No data fields>}, <No data fields>}}}
        seqacts = 0x7f11f616b010
        idacts = <optimized out>
        fetcharg = {seqacts = 0x7f11f616b010, actpos = 15, valpos = 0, deltermbuf = @0x7f11f616b000}
        idrq = {cmp = {compare = 0x7f1253a01dc0 <ebin_cmp(sized_buf const*, sized_buf const*)>}, file = 0x7f1210d462a0, num_actions = 256, actions = 0x7f11f616c810, 
          fetch_callback = 0x7f12539f2af0 <idfetch_update_cb(couchfile_modify_request*, sized_buf*, sized_buf*, void*)>, fetch_callback_ctx = 0x7f1213ff45a0, reduce = 0x7f1253a01450
     <by_id_reduce(char*, size_t*, nodelist const*, int, void*)>, rereduce = 0x7f1253a01520 <by_id_rereduce(char*, size_t*, nodelist const*, int, void*)>, user_reduce_ctx = 0x0, purge_kp = 0x0, purge_kv = 0x0, enable_purging = 0, 
          guided_purge_ctx = 0x0, compacting = 0, kv_chunk_threshold = 1279, kp_chunk_threshold = 1279, save_callback = 0x7f1253e23840 <saveDocsCallback(DocInfo const*, DocInfo const*, void*)>, save_callback_ctx = 0x7f1213ff4a30, 
          docinfo_callback = 0x7f12539e4eb0 <by_id_read_docinfo(_docinfo**, _sized_buf const*, _sized_buf const*)>}
        new_seq_root = <optimized out>
#21 couchstore_save_documents_and_callback (db=<optimized out>, docs=<optimized out>, infos=<optimized out>, numdocs=<optimized out>, options=options@entry=3, 
    save_cb=save_cb@entry=0x7f1253e23840 <saveDocsCallback(DocInfo const*, DocInfo const*, void*)>, save_cb_ctx=<optimized out>) at /home/couchbase/jenkins/workspace/couchbase-server-unix/couchstore/src/couch_save.cc:424
        CL_item = {_M_t = {
            _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>}}}
        CL_item_ptr = {value = {_M_b = {_M_p = 0x0}, static is_always_lock_free = <error reading variable: No global symbol "std::atomic<CouchLatencyItem*>::is_always_lock_free".>}}
        CL_lat_collector = <optimized out>
        CL_timer = {blockTimer = {dest = 0x0, start = {__d = {__r = 0}}, name = 0x0, out = 0x0}}
        term_meta_size = <optimized out>
        fb = {_M_t = {
            _M_t = {<std::_Tuple_impl<0, fatbuf*, cb::couchstore::FatbufDeletor>> = {<std::_Tuple_impl<1, cb::couchstore::FatbufDeletor>> = {<std::_Head_base<1, cb::couchstore::FatbufDeletor, true>> = {<cb::couchstore::FatbufDeletor> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0, fatbuf*, false>> = {_M_head_impl = 0x7f11f615f000}, <No data fields>}, <No data fields>}}}
        seqklist = 0x7f11f615f010
        idklist = <optimized out>
        seqvlist = <optimized out>
---Type <return> to continue, or q <return> to quit---
        idvlist = <optimized out>
        seq = <optimized out>
#22 0x00007f1253e2fa78 in CouchKVStore::saveDocs (this=this@entry=0x7f12408d0800, vbid=..., docs=..., docinfos=..., kvctx=...)
    at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/couch-kvstore/couch-kvstore.cc:2163
        cs_begin = <optimized out>
        flags = 3
        maxDBSeqno = 1471
        state = <optimized out>
        cs_begin = <optimized out>
        stats = <optimized out>
        info = {version = 1, timestamp = 139716669775205, updateSeqNum = 72340168861763936, purgeSeqNum = 2048, headerPosition = 3149312, filename = 0x800 <Address 0x800 out of bounds>, docCount = 2048, deletedCount = 139716292333568, 
          spaceUsed = 256, fileSize = 139715621637648}
        docsLogicalBytes = <optimized out>
        errCode = <optimized out>
        db = {kvstore = @0x7f12408d0800, db = 0x7f1210d462a0, fileRev = 12}
#23 0x00007f1253e309aa in CouchKVStore::commit2couchstore (this=0x7f12408d0800, commitData=...) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/couch-kvstore/couch-kvstore.cc:2018
        success = true
        vbucket2flush = {vbid = 138}
        phosphor_internal_category_enabled_2005 = {_M_b = {_M_p = 0x0}, static is_always_lock_free = <error reading variable: No global symbol "std::atomic<std::atomic<phosphor::CategoryStatus> const*>::is_always_lock_free".>}
        phosphor_internal_category_enabled_temp_2005 = <optimized out>
        phosphor_internal_tpi_2005 = {category = 0x2ba281 <Address 0x2ba281 out of bounds>, name = 0x2ba39b <Address 0x2ba39b out of bounds>, type = phosphor::Complete, argument_names = {_M_elems = {
              0x2977da <Address 0x2977da out of bounds>, 0x2ba3ad <Address 0x2ba3ad out of bounds>}}, argument_types = {_M_elems = {phosphor::is_uint, phosphor::is_uint}}}
        phosphor_internal_guard_2005 = {tpi = 0x7f1254186fe0 <CouchKVStore::commit2couchstore(VB::Commit&)::phosphor_internal_tpi_2005>, enabled = true, arg1 = 138, arg2 = 256, start = {__d = {__r = 1144942381723320}}}
        docs = {<std::_Vector_base<_doc*, std::allocator<_doc*> >> = {_M_impl = {<std::allocator<_doc*>> = {<__gnu_cxx::new_allocator<_doc*>> = {<No data fields>}, <No data fields>}, _M_start = 0x7f123bf94800, 
              _M_finish = 0x7f123bf95000, _M_end_of_storage = 0x7f123bf95000}}, <No data fields>}
        docinfos = {<std::_Vector_base<_docinfo*, std::allocator<_docinfo*> >> = {_M_impl = {<std::allocator<_docinfo*>> = {<__gnu_cxx::new_allocator<_docinfo*>> = {<No data fields>}, <No data fields>}, _M_start = 0x7f1210d71800, 
              _M_finish = 0x7f1210d72000, _M_end_of_storage = 0x7f1210d72000}}, <No data fields>}
        kvctx = {keyWasOnDisk = {
            _M_h = {<std::__detail::_Hashtable_base<DiskDocKey, DiskDocKey, std::__detail::_Identity, std::equal_to<DiskDocKey>, std::hash<DiskDocKey>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, true, true> >> = {<std::__detail::_Hash_code_base<DiskDocKey, DiskDocKey, std::__detail::_Identity, std::hash<DiskDocKey>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>> = {<std::__detail::_Hashtable_ebo_helper<0, std::__detail::_Identity, true>> = {<std::__detail::_Identity> = {<No data fields>}, <No data fields>}, <std::__detail::_Hashtable_ebo_helper<1, std::hash<DiskDocKey>, true>> = {<std::hash<DiskDocKey>> = {<No data fields>}, <No data fields>}, <std::__detail::_Hashtable_ebo_helper<2, std::__detail::_Mod_range_hashing, true>> = {<std::__detail::_Mod_range_hashing> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::__detail::_Hashtable_ebo_helper<0, std::equal_to<DiskDocKey>, true>> = {<std::equal_to<DiskDocKey>> = {<std::binary_function<DiskDocKey, DiskDocKey, bool>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, <std::__detail::_Map_base<DiskDocKey, DiskDocKey, std::allocator<DiskDocKey>, std::__detail::_Identity, std::equal_to<DiskDocKey>, std::hash<DiskDocKey>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, true, true>, true>> = {<No data fields>}, <std::__detail::_Insert<DiskDocKey, DiskDocKey, std::allocator<DiskDocKey>, std::__detail::_Identity, std::equal_to<DiskDocKey>, std::hash<DiskDocKey>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, true, true>, true>> = {<std::__detail::_Insert_base<DiskDocKey, DiskDocKey, std::allocator<DiskDocKey>, std::__detail::_Identity, std::equal_to<DiskDocKey>, std::hash<DiskDocKey>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, true, true> >> = {<No data fields>}, <No data fields>}, <std::__detail::_Rehash_base<DiskDocKey, DiskDocKey, std::allocator<DiskDocKey>, std::__detail::_Identity, std::equal_to<DiskDocKey>, std::hash<DiskDocKey>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, true, true>, std::integral_constant<bool, true> >> = {<No data fields>}, <std::__detail::_Equality<DiskDocKey, DiskDocKey, std::allocator<DiskDocKey>, std::__detail::_Identity, std::equal_to<DiskDocKey>, std::hash<DiskDocKey>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, true, true>, true>> = {<No data fields>}, <std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<DiskDocKey, true> > >> = {<std::__detail::_Hashtable_ebo_helper<0, std::allocator<std::__detail::_Hash_node<DiskDocKey, true> >, true>> = {<std::allocator<std::__detail::_Hash_node<DiskDocKey, true> >> = {<__gnu_cxx::new_allocator<std::__detail::_Hash_node<DiskDocKey, true> >> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, _M_buckets = 0x7f1210d463e0, _M_bucket_count = 17, _M_before_begin = {_M_nxt = 0x7f123bf1f1b0}, _M_element_count = 15, _M_rehash_policy = {static _S_growth_factor = 2, _M_max_load_factor = 1, 
                _M_next_resize = 17}, _M_single_bucket = 0x0}}, commitData = @0x7f1213ff4e10, onDiskPrepareDelta = 0}
        errCode = <optimized out>
#24 0x00007f1253e31045 in CouchKVStore::commit (this=0x7f12408d0800, commitData=...) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/couch-kvstore/couch-kvstore.cc:1297
No locals.
#25 0x00007f1253d1aa22 in EPBucket::commit (this=this@entry=0x7f124089f000, vbid=..., kvstore=..., commitData=...) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_bucket.cc:875
        timer = {dest = 0x7f12407ff4f0, start = {__d = {__r = 1144942381720681}}, name = 0x7f1253ed4f61 "disk_commit", out = 0x0}
        commit_start = <optimized out>
        res = <optimized out>
        commit_end = <optimized out>
#26 0x00007f1253d1e559 in EPBucket::flushVBucket (this=0x7f124089f000, vbid=...) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/ep_bucket.cc:744
        vb = {vb = {<std::__shared_ptr<VBucket, (__gnu_cxx::_Lock_policy)2>> = {<std::__shared_ptr_access<VBucket, (__gnu_cxx::_Lock_policy)2, false, false>> = {<No data fields>}, _M_ptr = 0x7f123826f100, _M_refcount = {
                _M_pi = 0x7f123bfaaa40}}, <No data fields>}, lock = {_M_device = 0x7f123bd47590, _M_owns = true}}
        toFlush = {items = {<std::_Vector_base<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> >, std::allocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > > >> = {
              _M_impl = {<std::allocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > >> = {<__gnu_cxx::new_allocator<SingleThreadedRCPtr<Item, Item*, std::default_delete<Item> > >> = {<No data fields>}, <No data fields>}, _M_start = 0x0, _M_finish = 0x0, _M_end_of_storage = 0x0}}, <No data fields>}, ranges = {<std::_Vector_base<CheckpointSnapshotRange, std::allocator<CheckpointSnapshotRange> >> = {
              _M_impl = {<std::allocator<CheckpointSnapshotRange>> = {<__gnu_cxx::new_allocator<CheckpointSnapshotRange>> = {<No data fields>}, <No data fields>}, _M_start = 0x0, _M_finish = 0x0, 
                _M_end_of_storage = 0x0}}, <No data fields>}, moreAvailable = false, maxDeletedRevSeqno = {<std::_Optional_base<unsigned long>> = {_M_payload = {{_M_empty = {<No data fields>}, _M_payload = 2}, 
                _M_engaged = true}}, <std::_Enable_copy_move<true, true, true, true, std::optional<unsigned long> >> = {<No data fields>}, <No data fields>}, checkpointType = Disk, flushHandle = {_M_t = {
---Type <return> to continue, or q <return> to quit---
              _M_t = {<std::_Tuple_impl<0, FlushHandle*, std::default_delete<FlushHandle> >> = {<std::_Tuple_impl<1, std::default_delete<FlushHandle> >> = {<std::_Head_base<1, std::default_delete<FlushHandle>, true>> = {<std::default_delete<FlushHandle>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0, FlushHandle*, false>> = {_M_head_impl = 0x7f1211244f60}, <No data fields>}, <No data fields>}}}}
        moreAvailable = EPBucket::No
        wakeupCheckpointRemover = EPBucket::No
        range = {<std::_Optional_base<snapshot_range_t>> = {_M_payload = {{_M_empty = {<No data fields>}, _M_payload = {start = 1471, end = 1471}}, 
              _M_engaged = true}}, <std::_Enable_copy_move<true, true, true, true, std::optional<snapshot_range_t> >> = {<No data fields>}, <No data fields>}
        prev = 0x7f1201955970
        persistedVbState = <optimized out>
        vbstate = {static CurrentVersion = 3, maxDeletedSeqno = {counter = {_M_elems = "\002\000\000\000\000"}}, highSeqno = 1215, purgeSeqno = 0, lastSnapStart = 1215, lastSnapEnd = 1215, maxCas = 1592132834304786432, 
          hlcCasEpochSeqno = 1, mightContainXattrs = false, supportsNamespaces = true, version = 3, persistedCompletedSeqno = 0, persistedPreparedSeqno = 0, highPreparedSeqno = 0, maxVisibleSeqno = 1215, onDiskPrepares = 0, 
          checkpointType = Disk, transition = {failovers = {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                _M_p = 0x7f12033ad800 <Address 0x7f12033ad800 out of bounds>}, _M_string_length = 840, {_M_local_buf = "H\003\000\000\000\000\000\000\037\000\000\000\000\000\000", _M_allocated_capacity = 840}}, replicationTopology = {
              m_type = nlohmann::detail::null, m_value = {object = 0x0, array = 0x0, string = 0x0, boolean = false, number_integer = 0, number_unsigned = 0, number_float = 0}}, state = vbucket_state_replica}}
        commitData = {collections = {needsPurge = false, mutated = {
              _M_h = {<std::__detail::_Hashtable_base<CollectionID, CollectionID, std::__detail::_Identity, std::equal_to<CollectionID>, std::hash<CollectionID>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, true, true> >> = {<std::__detail::_Hash_code_base<CollectionID, CollectionID, std::__detail::_Identity, std::hash<CollectionID>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>> = {<std::__detail::_Hashtable_ebo_helper<0, std::__detail::_Identity, true>> = {<std::__detail::_Identity> = {<No data fields>}, <No data fields>}, <std::__detail::_Hashtable_ebo_helper<1, std::hash<CollectionID>, true>> = {<std::hash<CollectionID>> = {<No data fields>}, <No data fields>}, <std::__detail::_Hashtable_ebo_helper<2, std::__detail::_Mod_range_hashing, true>> = {<std::__detail::_Mod_range_hashing> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::__detail::_Hashtable_ebo_helper<0, std::equal_to<CollectionID>, true>> = {<std::equal_to<CollectionID>> = {<std::binary_function<CollectionID, CollectionID, bool>> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, <std::__detail::_Map_base<CollectionID, CollectionID, std::allocator<CollectionID>, std::__detail::_Identity, std::equal_to<CollectionID>, std::hash<CollectionID>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, true, true>, true>> = {<No data fields>}, <std::__detail::_Insert<CollectionID, CollectionID, std::allocator<CollectionID>, std::__detail::_Identity, std::equal_to<CollectionID>, std::hash<CollectionID>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, true, true>, true>> = {<std::__detail::_Insert_base<CollectionID, CollectionID, std::allocator<CollectionID>, std::__detail::_Identity, std::equal_to<CollectionID>, std::hash<CollectionID>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, true, true> >> = {<No data fields>}, <No data fields>}, <std::__detail::_Rehash_base<CollectionID, CollectionID, std::allocator<CollectionID>, std::__detail::_Identity, std::equal_to<CollectionID>, std::hash<CollectionID>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, true, true>, std::integral_constant<bool, true> >> = {<No data fields>}, <std::__detail::_Equality<CollectionID, CollectionID, std::allocator<CollectionID>, std::__detail::_Identity, std::equal_to<CollectionID>, std::hash<CollectionID>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, true, true>, true>> = {<No data fields>}, <std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<CollectionID, true> > >> = {<std::__detail::_Hashtable_ebo_helper<0, std::allocator<std::__detail::_Hash_node<CollectionID, true> >, true>> = {<std::allocator<std::__detail::_Hash_node<CollectionID, true> >> = {<__gnu_cxx::new_allocator<std::__detail::_Hash_node<CollectionID, true> >> = {<No data fields>}, <No data fields>}, <No data fields>}, <No data fields>}, _M_buckets = 0x7f123befcc00, _M_bucket_count = 7, _M_before_begin = {_M_nxt = 0x7f11f60e57e0}, _M_element_count = 3, 
                _M_rehash_policy = {static _S_growth_factor = 2, _M_max_load_factor = 1, _M_next_resize = 7}, _M_single_bucket = 0x0}}, manifest = @0x7f123bfb2d40}, proposedVBState = {static CurrentVersion = 3, maxDeletedSeqno = {
              counter = {_M_elems = "\002\000\000\000\000"}}, highSeqno = 1215, purgeSeqno = 0, lastSnapStart = 1471, lastSnapEnd = 1471, maxCas = 1592140583827275776, hlcCasEpochSeqno = 1, mightContainXattrs = false, 
            supportsNamespaces = true, version = 3, persistedCompletedSeqno = 0, persistedPreparedSeqno = 0, highPreparedSeqno = 0, maxVisibleSeqno = 1471, onDiskPrepares = 0, checkpointType = Disk, transition = {failovers = {
                static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x7f12408b0d80 <Address 0x7f12408b0d80 out of bounds>}, 
                _M_string_length = 840, {_M_local_buf = "H\003\000\000\000\000\000\000\000\253\062N\022\177\000", _M_allocated_capacity = 840}}, replicationTopology = {m_type = nlohmann::detail::null, m_value = {object = 0x0, 
                  array = 0x0, string = 0x0, boolean = false, number_integer = 0, number_unsigned = 0, number_float = 0}}, state = vbucket_state_replica}}}
        proposedVBState = @0x7f1213ff4e58: {static CurrentVersion = 3, maxDeletedSeqno = {counter = {_M_elems = "\002\000\000\000\000"}}, highSeqno = 1215, purgeSeqno = 0, lastSnapStart = 1471, lastSnapEnd = 1471, 
          maxCas = 1592140583827275776, hlcCasEpochSeqno = 1, mightContainXattrs = false, supportsNamespaces = true, version = 3, persistedCompletedSeqno = 0, persistedPreparedSeqno = 0, highPreparedSeqno = 0, maxVisibleSeqno = 1471, 
          onDiskPrepares = 0, checkpointType = Disk, transition = {failovers = {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                _M_p = 0x7f12408b0d80 <Address 0x7f12408b0d80 out of bounds>}, _M_string_length = 840, {_M_local_buf = "H\003\000\000\000\000\000\000\000\253\062N\022\177\000", _M_allocated_capacity = 840}}, replicationTopology = {
              m_type = nlohmann::detail::null, m_value = {object = 0x0, array = 0x0, string = 0x0, boolean = false, number_integer = 0, number_unsigned = 0, number_float = 0}}, state = vbucket_state_replica}}
        maxSeqno = 1471
        maxVbStateOpCas = 0
        minSeqno = 1216
        flushBatchSize = 256
        mustPersistVBState = false
        hcs = {<std::_Optional_base<unsigned long>> = {_M_payload = {{_M_empty = {<No data fields>}, _M_payload = 0}, 
              _M_engaged = false}}, <std::_Enable_copy_move<true, true, true, true, std::optional<unsigned long> >> = {<No data fields>}, <No data fields>}
        hps = {<std::_Optional_base<unsigned long>> = {_M_payload = {{_M_empty = {<No data fields>}, _M_payload = 0}, 
              _M_engaged = false}}, <std::_Enable_copy_move<true, true, true, true, std::optional<unsigned long> >> = {<No data fields>}, <No data fields>}
        maxVisibleSeqno = {<ThrowExceptionPolicy<unsigned long>> = {label = {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
                _M_p = 0x7f1213ff4ce0 "unlabelled"}, _M_string_length = 10, {_M_local_buf = "unlabelled\000f vb:", _M_allocated_capacity = 7812730926796664437}}}, val = 1471}
        aggStats = {numItems = 0, totalBytes = 0, totalAgeInMicro = 0}
        flushSuccess = <optimized out>
        highSeqno = <optimized out>
#27 0x00007f1253d734cc in Flusher::flushVB (this=this@entry=0x7f124090ad80) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/flusher.cc:306
        vbid = {vbid = 138}
        res = {moreAvailable = EPBucket::No, numFlushed = 0, wakeupCkptRemover = EPBucket::No}
#28 0x00007f1253d74699 in Flusher::step (this=0x7f124090ad80, task=0x7f123bda8210) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/flusher.cc:207
        more = <optimized out>
#29 0x00007f1253d77643 in GlobalTask::execute (this=0x7f123bda8210) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/globaltask.cc:73
        guard = {previous = 0x0}
---Type <return> to continue, or q <return> to quit---
#30 0x00007f1253d6de5f in ExecutorThread::run (this=0x7f124e3e9ce0) at /home/couchbase/jenkins/workspace/couchbase-server-unix/kv_engine/engines/ep/src/executorthread.cc:188
        curTaskDescr = {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
            _M_p = 0x7f1241d178a0 <Address 0x7f1241d178a0 out of bounds>}, _M_string_length = 31, {_M_local_buf = "\037\000\000\000\000\000\000\000\263\273\001\000\000\000\000", _M_allocated_capacity = 31}}
        woketime = <optimized out>
        scheduleOverhead = <optimized out>
        again = <optimized out>
        runtime = <optimized out>
        q = <optimized out>
        tick = 56 '8'
        guard = {engine = 0x0}
#31 0x00007f125277b777 in run (this=0x7f1241e61540) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:58
No locals.
#32 platform_thread_wrap (arg=0x7f1241e61540) at /home/couchbase/jenkins/workspace/couchbase-server-unix/platform/src/cb_pthreads.cc:71
        context = {_M_t = {
            _M_t = {<std::_Tuple_impl<0, CouchbaseThread*, std::default_delete<CouchbaseThread> >> = {<std::_Tuple_impl<1, std::default_delete<CouchbaseThread> >> = {<std::_Head_base<1, std::default_delete<CouchbaseThread>, true>> = {<std::default_delete<CouchbaseThread>> = {<No data fields>}, <No data fields>}, <No data fields>}, <std::_Head_base<0, CouchbaseThread*, false>> = {_M_head_impl = 0x7f1241e61540}, <No data fields>}, <No data fields>}}}
#33 0x00007f124fdb8e65 in start_thread (arg=0x0) at pthread_create.c:282
        pd = 0x0
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139715621680896, 1033773021198315377, 0, 8392704, 0, 139715621680896, -1117854869120061583, -1117969529059512463}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {
              prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
#34 0x00007f124fae188d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:70
No locals.
#35 0x0000000000000000 in ?? ()
No symbol table info available.
(gdb)