Debug assertion failure w == MAYBE_NOP in mtr_t::memcpy(), trx_undo_write_xid()

#0  __GI_raise (sig=sig@entry=6) at raise.c:51

#1  0x00007ffff4b467f1 in __GI_abort () at abort.c:79

#2  0x00007ffff4b363fa in __assert_fail_base (fmt=0x7ffff4cbd6c0 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x555556fff6d9 "w == MAYBE_NOP", file=file@entry=0x555556ffb7a0 "/home2/me/MEP/WTs/10.6/A0/storage/innobase/include/mtr0log.h", line=line@entry=503, function=function@entry=0x555556fff978 "void mtr_t::memcpy(const buf_block_t&, void*, const void*, ulint) [with mtr_t::write_type w = mtr_t::NORMAL; ulint = long unsigned int]") at assert.c:92

#3  0x00007ffff4b36472 in __GI___assert_fail (assertion=0x555556fff6d9 "w == MAYBE_NOP", file=0x555556ffb7a0 "/home2/me/MEP/WTs/10.6/A0/storage/innobase/include/mtr0log.h", line=503, function=0x555556fff978 "void mtr_t::memcpy(const buf_block_t&, void*, const void*, ulint) [with mtr_t::write_type w = mtr_t::NORMAL; ulint = long unsigned int]") at assert.c:101

#4  0x0000555556803e64 in mtr_t::memcpy<(mtr_t::write_type)0> (this=0x7fffe8c704a0, b=..., dest=0x7fffea32d3f5, str=0x7fffb403d928, len=2) at mtr0log.h:503

#5  0x000055555694a218 in trx_undo_write_xid (block=0x7fffe9c74bc0, offset=5051, xid=..., mtr=0x7fffe8c704a0) at trx0undo.cc:642

#6  0x000055555694ceed in trx_undo_set_state_at_prepare (trx=0x7fffeac72980, undo=0x7fffb403d8f8, rollback=false, mtr=0x7fffe8c704a0) at trx0undo.cc:1539

#7  0x000055555693f653 in trx_prepare_low (trx=0x7fffeac72980) at trx0trx.cc:1848

#8  0x000055555693f788 in trx_prepare (trx=0x7fffeac72980) at trx0trx.cc:1869

#9  0x000055555693f9a7 in trx_prepare_for_mysql (trx=0x7fffeac72980) at trx0trx.cc:1922

#10 0x00005555566e6d69 in innobase_xa_prepare (hton=0x55555859d768, thd=0x7fffb0016c08, prepare_trx=true) at ha_innodb.cc:17061

#11 0x00005555562a6d6f in prepare_or_error (ht=0x55555859d768, thd=0x7fffb0016c08, all=true) at handler.cc:1458

#12 0x00005555562a6f38 in ha_prepare (thd=0x7fffb0016c08) at handler.cc:1504

#13 0x00005555561d4b7d in trans_xa_prepare (thd=0x7fffb0016c08) at xa.cc:547

#14 0x0000555555eec1ee in mysql_execute_command (thd=0x7fffb0016c08, is_called_from_prepared_stmt=false) at sql_parse.cc:5874

#15 0x0000555555ef2e37 in mysql_parse (thd=0x7fffb0016c08, rawbuf=0x7fffb0025a10 "XA PREPARE '9','5',1", length=20, parser_state=0x7fffe8c71310) at sql_parse.cc:8063