#0  0x00007f9937bba4bd in __wt_row_modify (cbt=cbt@entry=0x2805ed00, key=key@entry=0x2805ee18, value=value@entry=0x2805ee40,
    upd_arg=upd_arg@entry=0x0, modify_type=modify_type@entry=3, exclusive=exclusive@entry=false, restore=false)
    at ../src/btree/row_modify.c:113
#1  0x00007f9937b47c33 in __cursor_row_modify (modify_type=3, value=0x2805ee40, cbt=0x2805ed00) at ../src/btree/bt_cursor.c:1146
#2  __wt_btcur_insert (cbt=cbt@entry=0x2805ed00) at ../src/btree/bt_cursor.c:1146
#3  0x00007f9937bf9001 in __curfile_insert (cursor=0x2805ed00) at ../src/cursor/cur_file.c:380
#4  0x0000000000401517 in op (session=<optimized out>, rnd=rnd@entry=0x7f992aaeadc8, cpp=cpp@entry=0x7f992aaeae18)
    at ../test/csuite/wt4333_handle_locks/main.c:143
#5  0x0000000000401885 in wthread (arg=<optimized out>) at ../test/csuite/wt4333_handle_locks/main.c:180
#6  0x00007f9937ab1609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007f99379c6133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
(gdb) p mod->u2.row_leaf.update[0]
Cannot access memory at address 0x28241600