x/w is a gdb command to dereference and print (x) 1 word-sized data (w) at the address given by the expression. So 0x08001ea1 was the unaligned address stored a

x/w is a gdb command to dereference and print (x) 1 word-sized data (w) at the address given by the expression. So 0x08001ea1 was the unaligned address stored at $rsp + 8, passed as argument to __lll_lock_wait.