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[原创]新人贴，记录工作中解决bug用到的逆向知识

发表于: 2025-10-8 16:11 4188

[原创]新人贴，记录工作中解决bug用到的逆向知识

hexdeep

2025-10-8 16:11

4188

在使用rk3588开发云手机过程中，有部分核心板随机出现hostserver进程占用cpu过高问题

因为golang编译时候去除了调试信息，没有加上pprof，无法看到goroutine的工作状态，同时hostserver进程为服务进程

无法使用上面命令打印堆栈
同时环境不容易复现，无法通过反复修改代码来验证问题，只能在不破坏环境的情况下，尽可能多收集信息，然后定位问题。

打开ida，导入goparser

太清晰了，简直就是明文[呲牙]，以后用golang写程序要上加壳了

如果出现以上错误执行以下命令：

运行查看结果

现在我们已经知道消耗cpu的代码地址，0x0000000000086ba4 0x00000000004309f0 0x00000000003ab5ac

0x0000000000086ba4 代码：

0x00000000004309f0 代码：

0x00000000003ab5ac 代码：

从以上片段可以得出以下结论

runtime_goexit1 是 Go runtime 在销毁 goroutine 时的内部函数，说明有大量的goroutine创建和销毁

问题应该出在github_com_vishvananda_netlink__Handle_LinkByIndex这个函数

找到我们自己的代码

应该是上面这行代码导致的

用strace工具再次验证下

满屏的输出

基本可以肯定是上面这行代码导致的

case addrUpdate := <-addrCh:
link, err = netlink.LinkByIndex(addrUpdate.LinkIndex)

addrCh应该在什么场景下被close了，golang select 一个close的channel会导致立即返回，导致netlink.LinkByIndex(addrUpdate.LinkIndex)被无限调用，知道原因就好办了。

问题现象
分析过程
分析工具
环境配置
验证
结论

kill -QUIT $(pidof host_server)

perf record -F 99 -p $(pidof host_server) -g -- sleep 30

echo 1 > /proc/sys/kernel/kptr_restrict

perf report

Samples: 1K of event 'cycles:P', Event count (approx.): 24575912110
  Children      Self  Command      Shared Object      Symbol
+   50.49%     0.00%  host_server  host_server        [.] 0x0000000000086ba4
+   42.66%     0.00%  host_server  host_server        [.] 0x00000000004309f0
+   42.25%     0.00%  host_server  host_server        [.] 0x00000000003ab5ac
+   42.07%     0.00%  host_server  host_server        [.] 0x00000000003ab5f4
+   41.87%     0.00%  host_server  host_server        [.] 0x00000000003a5f2c
+   37.75%     0.00%  host_server  [kernel.kallsyms]  [k] el0t_64_sync
+   37.75%     0.00%  host_server  [kernel.kallsyms]  [k] el0t_64_sync_handler
+   36.42%     0.00%  host_server  host_server        [.] 0x000000000008485c
+   30.67%     0.00%  host_server  [kernel.kallsyms]  [k] el0_svc
+   27.78%     0.00%  host_server  [kernel.kallsyms]  [k] do_el0_svc
+   27.72%     1.95%  host_server  [kernel.kallsyms]  [k] el0_svc_common.constprop.0
+   25.63%     0.06%  host_server  [kernel.kallsyms]  [k] invoke_syscall
+   25.23%     0.00%  host_server  host_server        [.] 0x00000000000190a0
+   17.42%     0.00%  host_server  host_server        [.] 0x00000000000ca99b
+   15.47%     0.00%  host_server  host_server        [.] 0x000000000002d914
+   15.28%     0.00%  host_server  host_server        [.] 0x00000000003a63c8
+   14.77%     0.00%  host_server  host_server        [.] 0x0000000000031884
+   11.29%     0.00%  host_server  host_server        [.] 0x00000000000548c4
+   11.11%     0.00%  host_server  host_server        [.] 0x00000000003a6248
+   11.01%     0.00%  host_server  host_server        [.] 0x000000000002445c
+   10.55%     0.00%  host_server  host_server        [.] 0x00000000000847c4
+    9.54%     0.00%  host_server  host_server        [.] 0x00000000003a765c
+    9.54%     0.00%  host_server  host_server        [.] 0x000000000007ce70
+    9.46%     0.00%  host_server  host_server        [.] 0x0000000000054dc0
+    8.59%     0.00%  host_server  host_server        [.] 0x0000000000024018
+    8.53%     0.00%  host_server  host_server        [.] 0x00000000000243d3
+    8.50%     0.00%  host_server  host_server        [.] 0x00000000003a62fc
+    8.23%     0.00%  host_server  host_server        [.] 0x00000000000cb4fc
+    7.97%     0.00%  host_server  host_server        [.] 0x000000000002d8e8
+    7.70%     0.00%  host_server  host_server        [.] 0x00000000000caa7c
+    7.52%     0.00%  host_server  host_server        [.] 0x0000000000087430
+    7.01%     0.18%  host_server  [kernel.kallsyms]  [k] el0_da
+    6.89%     0.00%  host_server  host_server        [.] 0x0000000000031ae4
+    6.73%     0.07%  host_server  [kernel.kallsyms]  [k] do_mem_abort
+    6.72%     0.00%  host_server  host_server        [.] 0x00000000003a741c
+    6.72%     0.00%  host_server  host_server        [.] 0x00000000000ee794
+    6.71%     0.00%  host_server  host_server        [.] 0x000000000002aff8
+    6.66%     0.10%  host_server  [kernel.kallsyms]  [k] do_translation_fault
+    6.50%     0.00%  host_server  host_server        [.] 0x00000000000e54d4
+    6.50%     0.00%  host_server  host_server        [.] 0x00000000003a752c
+    6.46%     0.08%  host_server  [kernel.kallsyms]  [k] do_page_fault
+    6.44%     0.00%  host_server  host_server        [.] 0x0000000000163d94
+    6.44%     0.00%  host_server  host_server        [.] 0x000000000016522c
+    6.07%     0.07%  host_server  [kernel.kallsyms]  [k] __arm64_sys_sendto
+    6.00%     0.00%  host_server  [kernel.kallsyms]  [k] __sys_sendto

Samples: 1K of event 'cycles:P', Event count (approx.): 24575912110

Children Self Command Shared Object Symbol

+ 50.49% 0.00% host_server host_server [.] 0x0000000000086ba4

+ 42.66% 0.00% host_server host_server [.] 0x00000000004309f0

+ 42.25% 0.00% host_server host_server [.] 0x00000000003ab5ac

+ 42.07% 0.00% host_server host_server [.] 0x00000000003ab5f4

+ 41.87% 0.00% host_server host_server [.] 0x00000000003a5f2c

+ 37.75% 0.00% host_server [kernel.kallsyms] [k] el0t_64_sync

+ 37.75% 0.00% host_server [kernel.kallsyms] [k] el0t_64_sync_handler

+ 36.42% 0.00% host_server host_server [.] 0x000000000008485c

+ 30.67% 0.00% host_server [kernel.kallsyms] [k] el0_svc

+ 27.78% 0.00% host_server [kernel.kallsyms] [k] do_el0_svc

+ 27.72% 1.95% host_server [kernel.kallsyms] [k] el0_svc_common.constprop.0

+ 25.63% 0.06% host_server [kernel.kallsyms] [k] invoke_syscall

+ 25.23% 0.00% host_server host_server [.] 0x00000000000190a0

+ 17.42% 0.00% host_server host_server [.] 0x00000000000ca99b

+ 15.47% 0.00% host_server host_server [.] 0x000000000002d914

+ 15.28% 0.00% host_server host_server [.] 0x00000000003a63c8

+ 14.77% 0.00% host_server host_server [.] 0x0000000000031884

+ 11.29% 0.00% host_server host_server [.] 0x00000000000548c4

+ 11.11% 0.00% host_server host_server [.] 0x00000000003a6248

+ 11.01% 0.00% host_server host_server [.] 0x000000000002445c

+ 10.55% 0.00% host_server host_server [.] 0x00000000000847c4

+ 9.54% 0.00% host_server host_server [.] 0x00000000003a765c

+ 9.54% 0.00% host_server host_server [.] 0x000000000007ce70

+ 9.46% 0.00% host_server host_server [.] 0x0000000000054dc0

+ 8.59% 0.00% host_server host_server [.] 0x0000000000024018

+ 8.53% 0.00% host_server host_server [.] 0x00000000000243d3

+ 8.50% 0.00% host_server host_server [.] 0x00000000003a62fc

+ 8.23% 0.00% host_server host_server [.] 0x00000000000cb4fc

+ 7.97% 0.00% host_server host_server [.] 0x000000000002d8e8

+ 7.70% 0.00% host_server host_server [.] 0x00000000000caa7c

+ 7.52% 0.00% host_server host_server [.] 0x0000000000087430

+ 7.01% 0.18% host_server [kernel.kallsyms] [k] el0_da

+ 6.89% 0.00% host_server host_server [.] 0x0000000000031ae4

+ 6.73% 0.07% host_server [kernel.kallsyms] [k] do_mem_abort

+ 6.72% 0.00% host_server host_server [.] 0x00000000003a741c

+ 6.72% 0.00% host_server host_server [.] 0x00000000000ee794

+ 6.71% 0.00% host_server host_server [.] 0x000000000002aff8

+ 6.66% 0.10% host_server [kernel.kallsyms] [k] do_translation_fault

+ 6.50% 0.00% host_server host_server [.] 0x00000000000e54d4

+ 6.50% 0.00% host_server host_server [.] 0x00000000003a752c

+ 6.46% 0.08% host_server [kernel.kallsyms] [k] do_page_fault

+ 6.44% 0.00% host_server host_server [.] 0x0000000000163d94

+ 6.44% 0.00% host_server host_server [.] 0x000000000016522c

+ 6.07% 0.07% host_server [kernel.kallsyms] [k] __arm64_sys_sendto

+ 6.00% 0.00% host_server [kernel.kallsyms] [k] __sys_sendto

.text:0000000000086BA0 ; =============== S U B R O U T I N E =======================================
.text:0000000000086BA0
.text:0000000000086BA0 ; Attributes: noreturn
.text:0000000000086BA0
.text:0000000000086BA0 runtime_goexit                          ; DATA XREF: runtime_oneNewExtraM+38↑o
.text:0000000000086BA0                                         ; runtime_newproc1+E0↑o
.text:0000000000086BA0                 MOV             X0, X0
.text:0000000000086BA4
.text:0000000000086BA4 loc_86BA4
.text:0000000000086BA4                 BL              runtime_goexit1_0

.text:0000000000086BA0 ; =============== S U B R O U T I N E =======================================

.text:0000000000086BA0

.text:0000000000086BA0 ; Attributes: noreturn

.text:0000000000086BA0

.text:0000000000086BA0 runtime_goexit ; DATA XREF: runtime_oneNewExtraM+38↑o

.text:0000000000086BA0 ; runtime_newproc1+E0↑o

.text:0000000000086BA0 MOV X0, X0

.text:0000000000086BA4

.text:0000000000086BA4 loc_86BA4

.text:0000000000086BA4 BL runtime_goexit1_0

.text:00000000004309D4                 SUB             X29, SP, #0x18
.text:00000000004309D8                 BL              sub_87260
.text:00000000004309DC
.text:00000000004309DC loc_4309DC                              ; DATA XREF: host_server_netlink__Netlink_Init_func1+10C↑o
.text:00000000004309DC                 SUB             X29, SP, #8
.text:00000000004309E0                 LDR             X1, [SP,#0x250+var_150]
.text:00000000004309E4                 ADRP            X27, #off_AD3828@PAGE
.text:00000000004309E8                 LDR             X0, [X27,#off_AD3828@PAGEOFF]
.text:00000000004309EC                 BL              github_com_vishvananda_netlink__Handle_LinkByIndex
.text:00000000004309F0                 CBNZ            X2, loc_4309FC
.text:00000000004309F4                 MOV             X4, XZR

.text:00000000004309D4 SUB X29, SP, #0x18

.text:00000000004309D8 BL sub_87260

.text:00000000004309DC

loc_4309DC                              ; DATA XREF: host_server_netlink__Netlink_Init_func1

+10C↑o

.text:00000000004309DC SUB X29, SP, #8

.text:00000000004309E0 LDR X1, [SP,#0x250+var_150]

.text:00000000004309E4 ADRP X27, #off_AD3828@PAGE

.text:00000000004309E8 LDR X0, [X27,#off_AD3828@PAGEOFF]

.text:00000000004309EC BL github_com_vishvananda_netlink__Handle_LinkByIndex

.text:00000000004309F0 CBNZ X2, loc_4309FC

.text:00000000004309F4 MOV X4, XZR

.text:00000000003AB59C                 STR             X2, [X25,#8]
.text:00000000003AB5A0
.text:00000000003AB5A0 loc_3AB5A0                              ; CODE XREF: github_com_vishvananda_netlink__Handle_LinkByIndex+29C↑j
.text:00000000003AB5A0                 STR             X0, [X1,#8]
.text:00000000003AB5A4                 MOV             X0, X5
.text:00000000003AB5A8                 BL              github_com_vishvananda_netlink_execGetLink
.text:00000000003AB5AC                 LDP             X29, X30, [SP,#0x120+var_128]
.text:00000000003AB5B0                 ADD             SP, SP, #0x120

.text:00000000003AB59C STR X2, [X25,#8]

.text:00000000003AB5A0

loc_3AB5A0                              ; CODE XREF: github_com_vishvananda_netlink__Handle_LinkByIndex

+29C↑j

.text:00000000003AB5A0 STR X0, [X1,#8]

.text:00000000003AB5A4 MOV X0, X5

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qiluword 雪币： 254 活跃值： (624) 能力值： ( LV2，RANK：10 ) 在线值：发帖 52 回帖 226 粉丝 1 关注私信	qiluword 2 楼 2025-10-10 09:36 0
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qiluword 雪币： 254 活跃值： (624) 能力值： ( LV2，RANK：10 ) 在线值：发帖 52 回帖 226 粉丝 1 关注私信	qiluword 2 楼 2025-10-10 09:36 0
IamHuskar 雪币： 1277 活跃值： (6683) 能力值： ( LV13，RANK：240 ) 在线值：发帖 79 回帖 1680 粉丝 87 关注私信	IamHuskar 4 3 楼 2025-10-14 11:06 0
mb_pgemecpo 雪币： 544 活跃值： (500) 能力值： ( LV2，RANK：10 ) 在线值：发帖 0 回帖 4 粉丝 0 关注私信	mb_pgemecpo 4 楼多少有点绕圈了有源码还要动态调试 2025-10-16 20:50 0
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