When using "dis -lr xxx+0x1", it is not correctly shown, for example: crash> dis -lr rb_next+0x1 /kernel/lib/rbtree.c: 445 0xffffffff8133ff60 <rb_next>: push %rbp However, dis -lr rb+next+0x4 is correctly shown, crash> dis -lr rb_next+0x4 /kernel/lib/rbtree.c: 445 0xffffffff8133ff60 <rb_next>: push %rbp /kernel/lib/rbtree.c: 448 0xffffffff8133ff61 <rb_next+0x1>: mov (%rdi),%rdx /kernel/lib/rbtree.c: 445 0xffffffff8133ff64 <rb_next+0x4>: mov %rsp,%rbp The reverse mode only disassembled (target - function_start) bytes, which was insufficient to reach the target instruction. Signed-off-by: neilfsun <neilfsun(a)tencent.com&gt; Signed-off-by: Feng Sun <loyou85(a)gmail.com&gt; --- kernel.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel.c b/kernel.c index bb148d0..93ea7a6 100644 --- a/kernel.c +++ b/kernel.c @@ -2120,7 +2120,7 @@ cmd_dis(void) if (reverse) sprintf(buf5, "x/%ldi 0x%lx", - (target - req->addr) ? target - req->addr : 1, + req->addr2 - req->addr, req->addr); else sprintf(buf5, "x/%ldi 0x%lx", -- 2.50.1