InnoDB: Failing assertion: *len in row_upd_ext_fetch

2020-08-23 15:35:09 0x7f517bcff700  InnoDB: Assertion failure in file /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0upd.cc line 1146

InnoDB: Failing assertion: *len

#1  0x00007f51c25b88b1 in __GI_abort () at abort.c:79

#2  0x000055f859ab1d10 in ut_dbg_assertion_failed (expr=0x55f85a20ecb5 "*len", file=0x55f85a20e9b8 "/home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0upd.cc", line=1146)

    at /home/mdbe/MDEV-23547/10.4/storage/innobase/ut/ut0dbg.cc:60

#3  0x000055f859a307f9 in row_upd_ext_fetch (data=0x7f517000c4a0 "", local_len=20, zip_size=0, len=0x7f517bcfcde8, heap=0x7f517000c3f0)

    at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0upd.cc:1146

#4  0x000055f859a3090a in row_upd_index_replace_new_col_val (dfield=0x7f517000c678, field=0x7f514c0749d8, col=0x7f514c0736d0, uf=0x7f517000c560, heap=0x7f517000c3f0, 

    zip_size=0) at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0upd.cc:1192

#5  0x000055f859a315df in row_upd_index_replace_new_col_vals (entry=0x7f517000c640, index=0x7f514c06d140, update=0x7f517000c4d0, heap=0x7f517000c3f0)

    at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0upd.cc:1401

#6  0x000055f859a8d2c2 in trx_undo_prev_version_build (index_rec=0x7f51b79a4081 "2222222222", index_mtr=0x7f517bcfdb30, rec=0x7f51b79a4081 "2222222222", index=0x7f514c06d140, 

    offsets=0x7f5170008e90, heap=0x7f517000c3f0, old_vers=0x7f517bcfd210, v_heap=0x0, vrow=0x7f517bcfd758, v_status=3)

    at /home/mdbe/MDEV-23547/10.4/storage/innobase/trx/trx0rec.cc:2479

#7  0x000055f859a40477 in row_vers_vc_matches_cluster (rec=0x7f51b79a4081 "2222222222", icentry=0x7f517000aae0, clust_index=0x7f514c06d140, clust_offsets=0x7f5170008e90, 

    index=0x7f514c06c6c0, ientry=0x7f5170008980, roll_ptr=8162774346308341, trx_id=0, v_heap=0x0, vrow=0x7f517bcfd758, mtr=0x7f517bcfdb30)

    at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0vers.cc:702

#8  0x000055f859a41007 in row_vers_old_has_index_entry (also_curr=true, rec=0x7f51b79a4081 "2222222222", mtr=0x7f517bcfdb30, index=0x7f514c06c6c0, ientry=0x7f5170008980, 

    roll_ptr=8162774346308341, trx_id=0, vcol_info=0x55f85c76ca70) at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0vers.cc:986

#9  0x000055f8599fc3c6 in row_purge_poss_sec (node=0x55f85c76c8c0, index=0x7f514c06c6c0, entry=0x7f5170008980, sec_pcur=0x7f517bcfe080, sec_mtr=0x7f517bcfe320, is_tree=false)

    at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0purge.cc:320

#10 0x000055f8599fd2d8 in row_purge_remove_sec_if_poss_leaf (node=0x55f85c76c8c0, index=0x7f514c06c6c0, entry=0x7f5170008980)

    at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0purge.cc:582

#11 0x000055f8599fd7f3 in row_purge_remove_sec_if_poss (node=0x55f85c76c8c0, index=0x7f514c06c6c0, entry=0x7f5170008980)

    at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0purge.cc:695

#12 0x000055f8599fda18 in row_purge_del_mark (node=0x55f85c76c8c0) at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0purge.cc:769

#13 0x000055f8599ff637 in row_purge_record_func (node=0x55f85c76c8c0, undo_rec=0x7f5180012b48 "", thr=0x55f85c76c450, updated_extern=false)

    at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0purge.cc:1195

#14 0x000055f8599ff93e in row_purge (node=0x55f85c76c8c0, undo_rec=0x7f5180012b48 "", thr=0x55f85c76c450) at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0purge.cc:1261

#15 0x000055f8599ffb9c in row_purge_step (thr=0x55f85c76c450) at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0purge.cc:1320

#16 0x000055f85996ace8 in que_thr_step (thr=0x55f85c76c450) at /home/mdbe/MDEV-23547/10.4/storage/innobase/que/que0que.cc:1039

#17 0x000055f85996af7f in que_run_threads_low (thr=0x55f85c76c450) at /home/mdbe/MDEV-23547/10.4/storage/innobase/que/que0que.cc:1101

#18 0x000055f85996b1cd in que_run_threads (thr=0x55f85c76c450) at /home/mdbe/MDEV-23547/10.4/storage/innobase/que/que0que.cc:1141

#19 0x000055f859a4a71e in srv_task_execute (slot=0x55f85aa33db0 <srv_sys+560>) at /home/mdbe/MDEV-23547/10.4/storage/innobase/srv/srv0srv.cc:2471

#20 0x000055f859a4a94e in srv_worker_thread (arg=0x0) at /home/mdbe/MDEV-23547/10.4/storage/innobase/srv/srv0srv.cc:2519

#21 0x00007f51c3c0b6db in start_thread (arg=0x7f517bcff700) at pthread_create.c:463

#22 0x00007f51c2699a3f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

--source include/have_innodb.inc

CREATE TABLE t1 (col1 INT, col2 INT, col3 INT, col4 TEXT) ENGINE=InnoDB;

INSERT INTO t1 VALUES (2, 2, 1, REPEAT('2',8193));

ALTER TABLE t1 ADD UNIQUE s (col4), ALGORITHM=COPY;

ALTER TABLE t1 ADD PRIMARY KEY (col4(10));

DELETE FROM t1 WHERE col2 = 2 OR col2 IS NULL;

INSERT INTO t1 VALUES (2, 1, 2, REPEAT('2',8193));

--source include/restart_mysqld.inc

DROP TABLE t1;

(rr) bt

#0  innobase_get_computed_value (row=0x7fc6b8009080, col=0x7fc6d001f0b0, index=0x7fc6d00203a0, local_heap=0x7fc6cbffd6b0, heap=0x7fc6b8008fd0, ifield=0x0, thd=0x7fc6b8000d50, 

    mysql_table=0x7fc6b800aa00, mysql_rec=0x7fc6b800f0e0 "", old_table=0x0, parent_update=0x0, foreign=0x0)

    at /home/mdbe/MDEV-23547/10.4/storage/innobase/handler/ha_innodb.cc:20757

#1  0x000056219702abfc in row_vers_build_clust_v_col (row=0x7fc6b8009080, clust_index=0x7fc6d00203a0, index=0x7fc6d0020e20, heap=0x7fc6b8008fd0, vcol_info=0x562199be8da0)

    at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0vers.cc:490

#2  0x000056219702bf1a in row_vers_old_has_index_entry (also_curr=true, rec=0x7fc707d44081 "2222222222", mtr=0x7fc6cbffdb30, index=0x7fc6d0020e20, ientry=0x7fc6b80088a0, 

    roll_ptr=7318349415973136, trx_id=0, vcol_info=0x562199be8da0) at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0vers.cc:959

#3  0x0000562196fe73c6 in row_purge_poss_sec (node=0x562199be8bf0, index=0x7fc6d0020e20, entry=0x7fc6b80088a0, sec_pcur=0x7fc6cbffe080, sec_mtr=0x7fc6cbffe320, is_tree=false)

    at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0purge.cc:320

#4  0x0000562196fe82d8 in row_purge_remove_sec_if_poss_leaf (node=0x562199be8bf0, index=0x7fc6d0020e20, entry=0x7fc6b80088a0)

    at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0purge.cc:582

#5  0x0000562196fe87f3 in row_purge_remove_sec_if_poss (node=0x562199be8bf0, index=0x7fc6d0020e20, entry=0x7fc6b80088a0)

    at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0purge.cc:695

#6  0x0000562196fe8a18 in row_purge_del_mark (node=0x562199be8bf0) at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0purge.cc:769

#7  0x0000562196fea637 in row_purge_record_func (node=0x562199be8bf0, undo_rec=0x7fc6d0013330 "", thr=0x562199be8780, updated_extern=false)

    at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0purge.cc:1195

#8  0x0000562196fea93e in row_purge (node=0x562199be8bf0, undo_rec=0x7fc6d0013330 "", thr=0x562199be8780) at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0purge.cc:1261

#9  0x0000562196feab9c in row_purge_step (thr=0x562199be8780) at /home/mdbe/MDEV-23547/10.4/storage/innobase/row/row0purge.cc:1320

#10 0x0000562196f55ce8 in que_thr_step (thr=0x562199be8780) at /home/mdbe/MDEV-23547/10.4/storage/innobase/que/que0que.cc:1039

#11 0x0000562196f55f7f in que_run_threads_low (thr=0x562199be8780) at /home/mdbe/MDEV-23547/10.4/storage/innobase/que/que0que.cc:1101

#12 0x0000562196f561cd in que_run_threads (thr=0x562199be8780) at /home/mdbe/MDEV-23547/10.4/storage/innobase/que/que0que.cc:1141

#13 0x000056219703571e in srv_task_execute (slot=0x56219801edb0 <srv_sys+560>) at /home/mdbe/MDEV-23547/10.4/storage/innobase/srv/srv0srv.cc:2471

#14 0x000056219703594e in srv_worker_thread (arg=0x0) at /home/mdbe/MDEV-23547/10.4/storage/innobase/srv/srv0srv.cc:2519

#15 0x00007fc7144dc6db in start_thread (arg=0x7fc6cbfff700) at pthread_create.c:463

#16 0x00007fc712f6aa3f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

mariadbd: /data/src/10.5/storage/innobase/sync/sync0rw.cc:764: void rw_lock_sx_lock_func(rw_lock_t*, ulint, const char*, unsigned int): Assertion `!rw_lock_own(lock, RW_LOCK_S)' failed.

200823 19:22:29 [ERROR] mysqld got signal 6 ;

#3  0x00007f09dd851f12 in __GI___assert_fail (assertion=0x55a7acaa5375 "!rw_lock_own(lock, RW_LOCK_S)", 

    file=0x55a7acaa51e0 "/data/src/10.5/storage/innobase/sync/sync0rw.cc", line=764, 

    function=0x55a7acaa5ee0 <rw_lock_sx_lock_func(rw_lock_t*, unsigned long, char const*, unsigned int)::__PRETTY_FUNCTION__> "void rw_lock_sx_lock_func(rw_lock_t*, ulint, const char*, unsigned int)") at assert.c:101

#4  0x000055a7ac335ab3 in rw_lock_sx_lock_func (lock=0x7f09d311c680, pass=0, file_name=0x55a7acac9528 "/data/src/10.5/storage/innobase/btr/btr0btr.cc", line=227)

    at /data/src/10.5/storage/innobase/sync/sync0rw.cc:764

#5  0x000055a7ac3ff609 in pfs_rw_lock_sx_lock_func (lock=0x7f09d311c680, pass=0, file_name=0x55a7acac9528 "/data/src/10.5/storage/innobase/btr/btr0btr.cc", line=227)

    at /data/src/10.5/storage/innobase/include/sync0rw.ic:678

#6  0x000055a7ac406c16 in buf_page_mtr_lock (block=0x7f09d311c600, rw_latch=4, mtr=0x7f09d1ff5250, file=0x55a7acac9528 "/data/src/10.5/storage/innobase/btr/btr0btr.cc", 

    line=227) at /data/src/10.5/storage/innobase/buf/buf0buf.cc:2994

#7  0x000055a7ac408829 in buf_page_get_low (page_id=..., zip_size=0, rw_latch=4, guess=0x0, mode=10, file=0x55a7acac9528 "/data/src/10.5/storage/innobase/btr/btr0btr.cc", 

    line=227, mtr=0x7f09d1ff5250, err=0x7f09d1ff514c, allow_ibuf_merge=false) at /data/src/10.5/storage/innobase/buf/buf0buf.cc:3573

#8  0x000055a7ac408ba7 in buf_page_get_gen (page_id=..., zip_size=0, rw_latch=4, guess=0x0, mode=10, file=0x55a7acac9528 "/data/src/10.5/storage/innobase/btr/btr0btr.cc", 

    line=227, mtr=0x7f09d1ff5250, err=0x7f09d1ff514c, allow_ibuf_merge=false) at /data/src/10.5/storage/innobase/buf/buf0buf.cc:3642

#9  0x000055a7ac15877e in btr_block_get_func (index=..., page=3, mode=4, merge=false, file=0x55a7acac9528 "/data/src/10.5/storage/innobase/btr/btr0btr.cc", line=227, 

    mtr=0x7f09d1ff5250) at /data/src/10.5/storage/innobase/include/btr0btr.h:240

#10 0x000055a7ac39bd5d in btr_root_block_get (index=0x7f09c8016248, mode=RW_SX_LATCH, mtr=0x7f09d1ff5250) at /data/src/10.5/storage/innobase/btr/btr0btr.cc:226

#11 0x000055a7ac39cbcc in btr_get_size (index=0x7f09c8016248, flag=2, mtr=0x7f09d1ff5250) at /data/src/10.5/storage/innobase/btr/btr0btr.cc:603

#12 0x000055a7ac47edcd in dict_stats_update_transient_for_index (index=0x7f09c8016248) at /data/src/10.5/storage/innobase/dict/dict0stats.cc:858

#13 0x000055a7ac47f0fb in dict_stats_update_transient (table=0x7f09c801b288) at /data/src/10.5/storage/innobase/dict/dict0stats.cc:945

#14 0x000055a7ac484f2a in dict_stats_update (table=0x7f09c801b288, stats_upd_option=DICT_STATS_RECALC_TRANSIENT) at /data/src/10.5/storage/innobase/dict/dict0stats.cc:3328

#15 0x000055a7ac0ee16e in dict_stats_init (table=0x7f09c801b288) at /data/src/10.5/storage/innobase/include/dict0stats.ic:165

#16 0x000055a7ac0f7a46 in ha_innobase::open (this=0x7f09c80200a0, name=0x7f09c8016048 "./test/t1") at /data/src/10.5/storage/innobase/handler/ha_innodb.cc:5676

#17 0x000055a7abc9db38 in handler::ha_open (this=0x7f09c80200a0, table_arg=0x7f09c801cf18, name=0x7f09c8016048 "./test/t1", mode=2, test_if_locked=18, mem_root=0x0, 

    partitions_to_open=0x0) at /data/src/10.5/sql/handler.cc:2977

#18 0x000055a7aba7f128 in open_table_from_share (thd=0x7f09c8000c98, share=0x7f09c8015ab0, alias=0x7f09c80196e8, db_stat=33, prgflag=8, ha_open_flags=18, 

    outparam=0x7f09c801cf18, is_create_table=false, partitions_to_open=0x0) at /data/src/10.5/sql/table.cc:4208

#19 0x000055a7ab891e6a in open_table (thd=0x7f09c8000c98, table_list=0x7f09c80196a0, ot_ctx=0x7f09d1ff6450) at /data/src/10.5/sql/sql_base.cc:1988

#20 0x000055a7ab8c8c16 in open_purge_table (thd=0x7f09c8000c98, db=0x7f09d1ff64e0 "test", dblen=4, tb=0x7f09d1ff65b0 "t1", tblen=2) at /data/src/10.5/sql/sql_class.cc:4749

#21 0x000055a7ac115030 in innodb_find_table_for_vc (thd=0x7f09c8000c98, table=0x7f09c801b288) at /data/src/10.5/storage/innobase/handler/ha_innodb.cc:20391

#22 0x000055a7ac1155ff in innobase_allocate_row_for_vcol (thd=0x7f09c8000c98, index=0x7f09c8016d08, heap=0x7f09d1ff6720, table=0x7f09d1ff6730, record=0x7f09d1ff6738, 

    storage=0x7f09d1ff6728) at /data/src/10.5/storage/innobase/handler/ha_innodb.cc:20534

#23 0x000055a7ac319331 in row_vers_build_clust_v_col (row=0x7f09c800e2a8, clust_index=0x7f09c8016248, index=0x7f09c8016d08, heap=0x7f09c800e1f8)

    at /data/src/10.5/storage/innobase/row/row0vers.cc:465

#24 0x000055a7ac31a592 in row_vers_old_has_index_entry (also_curr=true, rec=0x7f09d3630081 "2222222222", mtr=0x7f09d1ff6880, index=0x7f09c8016d08, ientry=0x7f09c800b2b8, 

    roll_ptr=8162774346171468, trx_id=0) at /data/src/10.5/storage/innobase/row/row0vers.cc:929

#25 0x000055a7ac2d93b4 in row_purge_poss_sec (node=0x55a7afaffe20, index=0x7f09c8016d08, entry=0x7f09c800b2b8, sec_pcur=0x7f09d1ff6db0, sec_mtr=0x7f09d1ff7050, 

    ) at /data/src/10.5/storage/innobase/row/row0purge.cc:245

#26 0x000055a7ac2d9d54 in row_purge_remove_sec_if_poss_leaf (node=0x55a7afaffe20, index=0x7f09c8016d08, entry=0x7f09c800b2b8)

    at /data/src/10.5/storage/innobase/row/row0purge.cc:466

#27 0x000055a7ac2da240 in row_purge_remove_sec_if_poss (node=0x55a7afaffe20, index=0x7f09c8016d08, entry=0x7f09c800b2b8)

    at /data/src/10.5/storage/innobase/row/row0purge.cc:568

#28 0x000055a7ac2da451 in row_purge_del_mark (node=0x55a7afaffe20) at /data/src/10.5/storage/innobase/row/row0purge.cc:638

#29 0x000055a7ac2dbe74 in row_purge_record_func (node=0x55a7afaffe20, undo_rec=0x7f09c800f898 "", thr=0x55a7afaffd78, updated_extern=false)

    at /data/src/10.5/storage/innobase/row/row0purge.cc:1048

#30 0x000055a7ac2dc136 in row_purge (node=0x55a7afaffe20, undo_rec=0x7f09c800f898 "", thr=0x55a7afaffd78) at /data/src/10.5/storage/innobase/row/row0purge.cc:1109

#31 0x000055a7ac2dc2b5 in row_purge_step (thr=0x55a7afaffd78) at /data/src/10.5/storage/innobase/row/row0purge.cc:1158

#32 0x000055a7ac247bc8 in que_thr_step (thr=0x55a7afaffd78) at /data/src/10.5/storage/innobase/que/que0que.cc:947

#33 0x000055a7ac247e5f in que_run_threads_low (thr=0x55a7afaffd78) at /data/src/10.5/storage/innobase/que/que0que.cc:1009

#34 0x000055a7ac2480af in que_run_threads (thr=0x55a7afaffd78) at /data/src/10.5/storage/innobase/que/que0que.cc:1049

#35 0x000055a7ac354f13 in trx_purge (n_tasks=4, truncate=false) at /data/src/10.5/storage/innobase/trx/trx0purge.cc:1301

#36 0x000055a7ac322b0d in srv_do_purge (n_total_purged=0x7f09d1ff7c68) at /data/src/10.5/storage/innobase/srv/srv0srv.cc:2103

#37 0x000055a7ac323012 in purge_coordinator_callback_low () at /data/src/10.5/storage/innobase/srv/srv0srv.cc:2190

#38 0x000055a7ac3230f3 in purge_coordinator_callback () at /data/src/10.5/storage/innobase/srv/srv0srv.cc:2219

#39 0x000055a7ac53bcd4 in tpool::task_group::execute (this=0x55a7add95e40 <purge_coordinator_task_group>, t=0x55a7add95ee0 <purge_coordinator_task>)

    at /data/src/10.5/tpool/task_group.cc:55

#40 0x000055a7ac53c08a in tpool::task::execute (this=0x55a7add95ee0 <purge_coordinator_task>) at /data/src/10.5/tpool/task.cc:47

#41 0x000055a7ac535872 in tpool::thread_pool_generic::worker_main (this=0x55a7af95ae00, thread_var=0x55a7af96a910) at /data/src/10.5/tpool/tpool_generic.cc:518

#42 0x000055a7ac53bae5 in std::__invoke_impl<void, void (tpool::thread_pool_generic::* const&)(tpool::worker_data*), tpool::thread_pool_generic*, tpool::worker_data*>(std::__invoke_memfun_deref, void (tpool::thread_pool_generic::* const&)(tpool::worker_data*), tpool::thread_pool_generic*&&, tpool::worker_data*&&) (__f=

    @0x7f09d4001ee8: (void (tpool::thread_pool_generic::*)(tpool::thread_pool_generic * const, tpool::worker_data *)) 0x55a7ac5357da <tpool::thread_pool_generic::worker_main(tpool::worker_data*)>, __t=<unknown type in /data/bld/10.5-debug/bin/mariadbd, CU 0x826aa6e, DIE 0x827c1e6>, 

    __args#0=<unknown type in /data/bld/10.5-debug/bin/mariadbd, CU 0x826aa6e, DIE 0x827c1f2>) at /usr/include/c++/6/functional:227

#43 0x000055a7ac53ba57 in std::__invoke<void (tpool::thread_pool_generic::* const&)(tpool::worker_data*), tpool::thread_pool_generic*, tpool::worker_data*>(void (tpool::thread_pool_generic::* const&)(tpool::worker_data*), tpool::thread_pool_generic*&&, tpool::worker_data*&&) (__fn=

    @0x7f09d4001ee8: (void (tpool::thread_pool_generic::*)(tpool::thread_pool_generic * const, tpool::worker_data *)) 0x55a7ac5357da <tpool::thread_pool_generic::worker_main(tpool::worker_data*)>, __args#0=<unknown type in /data/bld/10.5-debug/bin/mariadbd, CU 0x826aa6e, DIE 0x827c1e6>, 

    __args#1=<unknown type in /data/bld/10.5-debug/bin/mariadbd, CU 0x826aa6e, DIE 0x827c1f2>) at /usr/include/c++/6/functional:251

#44 0x000055a7ac53b9eb in std::_Mem_fn_base<void (tpool::thread_pool_generic::*)(tpool::worker_data*), true>::operator()<tpool::thread_pool_generic*, tpool::worker_data*>(tpool::thread_pool_generic*&&, tpool::worker_data*&&) const (this=0x7f09d4001ee8, __args#0=<unknown type in /data/bld/10.5-debug/bin/mariadbd, CU 0x826aa6e, DIE 0x827c1e6>, 

    __args#1=<unknown type in /data/bld/10.5-debug/bin/mariadbd, CU 0x826aa6e, DIE 0x827c1f2>) at /usr/include/c++/6/functional:604

#45 0x000055a7ac53b99d in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::_M_invoke<0ul, 1ul>(std::_Index_tuple<0ul, 1ul>) (this=0x7f09d4001ed8) at /usr/include/c++/6/functional:1391

#46 0x000055a7ac53b89b in std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)>::operator()() (this=0x7f09d4001ed8) at /usr/include/c++/6/functional:1380

#47 0x000055a7ac53b87a in std::thread::_State_impl<std::_Bind_simple<std::_Mem_fn<void (tpool::thread_pool_generic::*)(tpool::worker_data*)> (tpool::thread_pool_generic*, tpool::worker_data*)> >::_M_run() (this=0x7f09d4001ed0) at /usr/include/c++/6/thread:197

#48 0x00007f09de199e6f in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6

#49 0x00007f09df7da4a4 in start_thread (arg=0x7f09d1ff8700) at pthread_create.c:456

#50 0x00007f09dd90ed0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97