第一次分析系统问题（重启）-小结备忘

偏执的太偏执、 2022-06-03 04:28 1106阅读 0赞

本次问题在kernel Log中没有找到任何有用的线索

1.在ZZ\_INTERNAL文件中找到：

Kernel (KE),0,0,99,/data/core/,0,,KE at \_\_schedule\_bug+0x98/0xd8,Wed Dec 6 17:55:16 CST 2017,1

可以确定可能内核代码有关，即驱动代码

2.使用GAT打开mtklog\\aee\_exp\_backup\\db.fatal.00.KE\\db.fatal.00.KE.dbg

需要LogViewer才能打开该文件，打开Logviewer的方法（两种）如下：

\*.打开GAT工具 -> Window -> Open LogViewer

\*.运行脚本：GAT工具目录\\tools\\MediatekLogView.bat

运行GAT ：jvm.dll cann't find 的问题，可能是版本不兼容的问题，就可能GAT是32位的，而jdk是64位的。必须要同时是32位或64位

打开db.fatal.00.KE.dbg，只有几个文件：

ZZ\_INTERNAL

SYS\_KERNEL\_LOG

SYS\_VERSION\_INFO

\_\_exp\_main.txt

在\_\_exp\_main.txt得到以下信息：需要有经验的人才能判断出问题。

Exception Class: Kernel (KE)  
PC is at \[<ffffffc0000baefc>\] \_\_schedule\_bug+0x98/0xd8  
LR is at \[<ffffffc0000baef4>\] \_\_schedule\_bug+0x90/0xd8  
  
Current Executing Process:  
\[d.process.media, 1068\]\[main, 214\]  
  
Backtrace:  
\[<ffffffc00093a728>\] \_\_do\_kernel\_fault.part.5+0x70/0x84  
\[<ffffffc000091fd4>\] do\_page\_fault+0x250/0x254  
\[<ffffffc000092094>\] do\_translation\_fault+0xbc/0xf0  
\[<ffffffc000081290>\] do\_mem\_abort+0x38/0x9c  
\[<ffffffc000083c50>\] el1\_da+0x14/0x80  
\[<ffffffc000941054>\] \_\_schedule+0x63c/0x70c  
\[<ffffffc000941148>\] schedule+0x24/0x74  
\[<ffffffc0009411a8>\] schedule\_preempt\_disabled+0x10/0x24  
\[<ffffffc0000d9474>\] mutex\_optimistic\_spin+0x184/0x1c8  
\[<ffffffc000942910>\] \_\_mutex\_lock\_slowpath+0x38/0x164  
\[<ffffffc000942a80>\] mutex\_lock+0x44/0x64  
\[<ffffffc000321bd4>\] pinctrl\_get\_device\_gpio\_range+0x4c/0xf8  
\[<ffffffc000321c9c>\] pinctrl\_gpio\_direction+0x1c/0x8c  
\[<ffffffc000323120>\] pinctrl\_gpio\_direction\_input+0xc/0x18  
\[<ffffffc000327720>\] mtk\_gpio\_direction\_input+0x10/0x1c  
\[<ffffffc00032b780>\] gpiod\_direction\_input+0x44/0x18c  
\[<ffffffc0005c279c>\] i2c\_transfer\_byte.isra.2+0xa4/0x118  
\[<ffffffc0005c2c28>\] i2c\_write\_buf.constprop.9+0x34/0x78  
\[<ffffffc0005c2ddc>\] led\_time\_hrtimer\_func+0x60/0x108  
\[<ffffffc0000f35a4>\] \_\_run\_hrtimer+0x78/0x260  
\[<ffffffc0000f4318>\] hrtimer\_interrupt+0x108/0x2a0  
\[<ffffffc0006e1488>\] arch\_timer\_handler\_phys+0x28/0x38  
\[<ffffffc0000e72b8>\] handle\_percpu\_devid\_irq+0xa4/0x1a8  
\[<ffffffc0000e354c>\] generic\_handle\_irq+0x30/0x4c  
\[<ffffffc0000e35ec>\] \_\_handle\_domain\_irq+0x84/0xf0  
\[<ffffffc000081418>\] gic\_handle\_irq+0x34/0x80

在SYS\_KERNEL\_LOG没有找到有用的信息

在SYS\_VERSION\_INFO没有找到有用的信息

在mtklog\\mobilelog\\APLog\_2017\_1206\_175544\\last\_kmsg中找到比较直接的提示

\[ 2133.862246\] -(2)\[1068:d.process.media\]BUG: scheduling while atomic: d.process.media/1068/0x00010001================================================================================================  
\[ 2133.863368\] Preemption disabled at:\[<ffffffc0000e35c4>\] \_\_handle\_domain\_irq+0x5c/0xf0  
\[ 2133.864344\] -(2)\[1068:d.process.media\]  
\[ 2133.864815\] -(2)\[1068:d.process.media\]CPU: 2 PID: 1068 Comm: d.process.media Tainted: G W 3.18.22+ \#1  
\[ 2133.866091\] -(2)\[1068:d.process.media\]Hardware name: MT8163 (DT)  
\[ 2133.866839\] -(2)\[1068:d.process.media\]Call trace:  
\[ 2133.867431\] -(2)\[1068:d.process.media\]\[<ffffffc000087c28>\] dump\_backtrace+0x0/0x124  
\[ 2133.868382\] -(2)\[1068:d.process.media\]\[<ffffffc000087d5c>\] show\_stack+0x10/0x1c  
\[ 2133.869294\] -(2)\[1068:d.process.media\]\[<ffffffc00093ba40>\] dump\_stack+0x74/0xb8  
\[ 2133.870205\] -(2)\[1068:d.process.media\]\[<ffffffc0000baec0>\] \_\_schedule\_bug+0x5c/0xd8  
\[ 2133.871159\] -(2)\[1068:d.process.media\]\[<ffffffc000941054>\] \_\_schedule+0x63c/0x70c  
\[ 2133.872092\] -(2)\[1068:d.process.media\]\[<ffffffc000941148>\] schedule+0x24/0x74  
\[ 2133.872981\] -(2)\[1068:d.process.media\]\[<ffffffc0009411a8>\] schedule\_preempt\_disabled+0x10/0x24  
\[ 2133.874055\] -(2)\[1068:d.process.media\]\[<ffffffc0000d9474>\] mutex\_optimistic\_spin+0x184/0x1c8  
\[ 2133.875106\] -(2)\[1068:d.process.media\]\[<ffffffc000942910>\] \_\_mutex\_lock\_slowpath+0x38/0x164  
\[ 2133.876146\] -(2)\[1068:d.process.media\]\[<ffffffc000942a80>\] mutex\_lock+0x44/0x64  
\[ 2133.877059\] -(2)\[1068:d.process.media\]\[<ffffffc000321bd4>\] pinctrl\_get\_device\_gpio\_range+0x4c/0xf8  
\[ 2133.878176\] -(2)\[1068:d.process.media\]\[<ffffffc000321c9c>\] pinctrl\_gpio\_direction+0x1c/0x8c  
\[ 2133.879217\] -(2)\[1068:d.process.media\]\[<ffffffc000323120>\] pinctrl\_gpio\_direction\_input+0xc/0x18  
\[ 2133.880314\] -(2)\[1068:d.process.media\]\[<ffffffc000327720>\] mtk\_gpio\_direction\_input+0x10/0x1c  
\[ 2133.881375\] -(2)\[1068:d.process.media\]\[<ffffffc00032b780>\] gpiod\_direction\_input+0x44/0x18c  
\[ 2133.882418\] -(2)\[1068:d.process.media\]\[<ffffffc0005c279c>\] i2c\_transfer\_byte.isra.2+0xa4/0x118  
\[ 2133.883491\] -(2)\[1068:d.process.media\]\[<ffffffc0005c2c28>\] i2c\_write\_buf.constprop.9+0x34/0x78  
\[ 2133.884565\] -(2)\[1068:d.process.media\]\[<ffffffc0005c2ddc>\] led\_time\_hrtimer\_func+0x60/0x108  
\[ 2133.885608\] -(2)\[1068:d.process.media\]\[<ffffffc0000f35a4>\] \_\_run\_hrtimer+0x78/0x260  
\[ 2133.886561\] -(2)\[1068:d.process.media\]\[<ffffffc0000f4318>\] hrtimer\_interrupt+0x108/0x2a0  
\[ 2133.887572\] -(2)\[1068:d.process.media\]\[<ffffffc0006e1488>\] arch\_timer\_handler\_phys+0x28/0x38  
\[ 2133.888624\] -(2)\[1068:d.process.media\]\[<ffffffc0000e72b8>\] handle\_percpu\_devid\_irq+0xa4/0x1a8  
\[ 2133.889685\] -(2)\[1068:d.process.media\]\[<ffffffc0000e354c>\] generic\_handle\_irq+0x30/0x4c  
\[ 2133.890682\] -(2)\[1068:d.process.media\]\[<ffffffc0000e35ec>\] \_\_handle\_domain\_irq+0x84/0xf0  
\[ 2133.891690\] -(2)\[1068:d.process.media\]\[<ffffffc000081418>\] gic\_handle\_irq+0x34/0x80  
\[ 2133.892643\] -(2)\[1068:d.process.media\]Exception stack(0xffffffc04c5ebeb0 to 0xffffffc04c5ebfd0)  
  
  
  
  
\[ 2133.910735\] -(2)\[1068:d.process.media\]Internal error: Oops: 96000046 \[\#1\] PREEMPT SMP=====================================================================================================  
\[ 2133.911711\] disable aee kernel api  
\[ 2133.912116\] -(2)\[1068:d.process.media\]CPU: 2 PID: 1068 Comm: d.process.media Tainted: G W 3.18.22+ \#1  
\[ 2133.913413\] -(2)\[1068:d.process.media\]Hardware name: MT8163 (DT)  
\[ 2133.914164\] -(2)\[1068:d.process.media\]task: ffffffc04c6aae00 ti: ffffffc04c5e8000 task.ti: ffffffc04c5e8000  
\[ 2133.915383\] -(2)\[1068:d.process.media\]PC is at \_\_schedule\_bug+0x98/0xd8======================================================================  
\[ 2133.916204\] -(2)\[1068:d.process.media\]LR is at \_\_schedule\_bug+0x90/0xd8======================================================================  
\[ 2133.917028\] -(2)\[1068:d.process.media\]pc : \[<ffffffc0000baefc>\] lr : \[<ffffffc0000baef4>\] pstate: 800001c5  
\[ 2133.918229\] -(2)\[1068:d.process.media\]sp : ffffffc04c5eb9d0  
  
  
  
  
\[ 2134.074609\] -(2)\[1068:d.process.media\]Exception stack(0xffffffc04c5eb810 to 0xffffffc04c5eb930)  
\[ 2134.075696\] -(2)\[1068:d.process.media\]b800: 7e791800 ffffffc0 4c5e8000 ffffffc0  
\[ 2134.076998\] -(2)\[1068:d.process.media\]b820: 4c5eb9d0 ffffffc0 000baefc ffffffc0 000161f1 00000000 000e1370 ffffffc0  
\[ 2134.078299\] -(2)\[1068:d.process.media\]b840: 4c5eb8a0 ffffffc0 000e1940 ffffffc0 00dc5000 ffffffc0 00000001 00000000  
\[ 2134.079601\] -(2)\[1068:d.process.media\]b860: 00cef000 ffffffc0 00000000 00000000 000001c0 00000000 0000005c 00000000  
\[ 2134.080902\] -(2)\[1068:d.process.media\]b880: 00000000 00000000 00000076 00000000 4c5eb8a0 ffffffc0 000e1950 ffffffc0  
\[ 2134.082204\] -(2)\[1068:d.process.media\]b8a0: 4c5eb940 ffffffc0 0093aa04 ffffffc0 0000dead 00000000 00000aee 00000000  
\[ 2134.083505\] -(2)\[1068:d.process.media\]b8c0: 00010001 00000000 00000002 00000000 00000001 00000000 00dc2be0 ffffffc0  
\[ 2134.084807\] -(2)\[1068:d.process.media\]b8e0: 0000d124 00000000 00000086 00000000 000161f1 00000000 00002aa2 00000000  
\[ 2134.086109\] -(2)\[1068:d.process.media\]b900: 756c6961 61206572 682f2074 2f656d6f 65646f63 38746d2f 5f333631 2f302e33  
\[ 2134.087409\] -(2)\[1068:d.process.media\]b920: 6e72656b 332d6c65 00000020 00000000  
\[ 2134.088321\] -(2)\[1068:d.process.media\]\[<ffffffc000083c50>\] el1\_da+0x14/0x80  
\[ 2134.089190\] -(2)\[1068:d.process.media\]\[<ffffffc000941054>\] \_\_schedule+0x63c/0x70c  
\[ 2134.090122\] -(2)\[1068:d.process.media\]\[<ffffffc000941148>\] schedule+0x24/0x74  
\[ 2134.091011\] -(2)\[1068:d.process.media\]\[<ffffffc0009411a8>\] schedule\_preempt\_disabled+0x10/0x24  
\[ 2134.092084\] -(2)\[1068:d.process.media\]\[<ffffffc0000d9474>\] mutex\_optimistic\_spin+0x184/0x1c8  
\[ 2134.093136\] -(2)\[1068:d.process.media\]\[<ffffffc000942910>\] \_\_mutex\_lock\_slowpath+0x38/0x164  
\[ 2134.094177\] -(2)\[1068:d.process.media\]\[<ffffffc000942a80>\] mutex\_lock+0x44/0x64  
\[ 2134.095090\] -(2)\[1068:d.process.media\]\[<ffffffc000321bd4>\] pinctrl\_get\_device\_gpio\_range+0x4c/0xf8  
\[ 2134.096207\] -(2)\[1068:d.process.media\]\[<ffffffc000321c9c>\] pinctrl\_gpio\_direction+0x1c/0x8c  
\[ 2134.097248\] -(2)\[1068:d.process.media\]\[<ffffffc000323120>\] pinctrl\_gpio\_direction\_input+0xc/0x18  
\[ 2134.098345\] -(2)\[1068:d.process.media\]\[<ffffffc000327720>\] mtk\_gpio\_direction\_input+0x10/0x1c  
\[ 2134.099406\] -(2)\[1068:d.process.media\]\[<ffffffc00032b780>\] gpiod\_direction\_input+0x44/0x18c  
\[ 2134.100448\] -(2)\[1068:d.process.media\]\[<ffffffc0005c279c>\] i2c\_transfer\_byte.isra.2+0xa4/0x118  
\[ 2134.101521\] -(2)\[1068:d.process.media\]\[<ffffffc0005c2c28>\] i2c\_write\_buf.constprop.9+0x34/0x78  
\[ 2134.102595\] -(2)\[1068:d.process.media\]\[<ffffffc0005c2ddc>\] led\_time\_hrtimer\_func+0x60/0x108  
\[ 2134.103637\] -(2)\[1068:d.process.media\]\[<ffffffc0000f35a4>\] \_\_run\_hrtimer+0x78/0x260  
\[ 2134.104591\] -(2)\[1068:d.process.media\]\[<ffffffc0000f4318>\] hrtimer\_interrupt+0x108/0x2a0  
\[ 2134.105602\] -(2)\[1068:d.process.media\]\[<ffffffc0006e1488>\] arch\_timer\_handler\_phys+0x28/0x38  
\[ 2134.106653\] -(2)\[1068:d.process.media\]\[<ffffffc0000e72b8>\] handle\_percpu\_devid\_irq+0xa4/0x1a8  
\[ 2134.107715\] -(2)\[1068:d.process.media\]\[<ffffffc0000e354c>\] generic\_handle\_irq+0x30/0x4c  
\[ 2134.108712\] -(2)\[1068:d.process.media\]\[<ffffffc0000e35ec>\] \_\_handle\_domain\_irq+0x84/0xf0  
\[ 2134.109721\] -(2)\[1068:d.process.media\]\[<ffffffc000081418>\] gic\_handle\_irq+0x34/0x80  
  
  
  
  
  
\[ 2134.126112\] -(2)\[1068:d.process.media\]has\_mt\_dump\_support: no mt\_dump support!======================================================================================================  
\[ 2134.127011\] -(1)\[1709:Thread-1365\]CPU1: stopping  
\[ 2134.127585\] -(1)\[1709:Thread-1365\]CPU: 1 PID: 1709 Comm: Thread-1365 Tainted: G W 3.18.22+ \#1  
\[ 2134.128774\] -(1)\[1709:Thread-1365\]Hardware name: MT8163 (DT)  
\[ 2134.129479\] -(1)\[1709:Thread-1365\]Call trace:  
\[ 2134.130029\] -(1)\[1709:Thread-1365\]\[<ffffffc000087c28>\] dump\_backtrace+0x0/0x124  
\[ 2134.130935\] -(1)\[1709:Thread-1365\]\[<ffffffc000087d5c>\] show\_stack+0x10/0x1c  
\[ 2134.131804\] -(1)\[1709:Thread-1365\]\[<ffffffc00093ba40>\] dump\_stack+0x74/0xb8  
\[ 2134.132670\] -(1)\[1709:Thread-1365\]\[<ffffffc00008fb90>\] handle\_IPI+0x278/0x288  
\[ 2134.133559\] -(1)\[1709:Thread-1365\]\[<ffffffc00008145c>\] gic\_handle\_irq+0x78/0x80  
\[ 2134.134469\] -(1)\[1709:Thread-1365\]Exception stack(0xffffffc03766feb0 to 0xffffffc03766ffd0)  
  
  
  
  
  
\[ 2134.176268\] -(0)\[0:swapper/0\]Call trace:  
\[ 2134.176760\] -(0)\[0:swapper/0\]\[<ffffffc000087c28>\] dump\_backtrace+0x0/0x124  
\[ 2134.177616\] -(0)\[0:swapper/0\]\[<ffffffc000087d5c>\] show\_stack+0x10/0x1c  
\[ 2134.178430\] -(0)\[0:swapper/0\]\[<ffffffc00093ba40>\] dump\_stack+0x74/0xb8  
\[ 2134.179243\] -(0)\[0:swapper/0\]\[<ffffffc00008fb90>\] handle\_IPI+0x278/0x288  
\[ 2134.180077\] -(0)\[0:swapper/0\]\[<ffffffc00008145c>\] gic\_handle\_irq+0x78/0x80  
\[ 2134.180934\] -(0)\[0:swapper/0\]Exception stack(0xffffffc000cd7d60 to 0xffffffc000cd7e80)  
\[ 2134.192757\] -(0)\[0:swapper/0\]\[<ffffffc000083de8>\] el1\_irq+0x68/0xdc  
\[ 2134.193539\] -(0)\[0:swapper/0\]\[<ffffffc0006c6cd8>\] cpuidle\_enter+0x14/0x20  
\[ 2134.194385\] -(0)\[0:swapper/0\]\[<ffffffc0000d21a0>\] cpu\_startup\_entry+0x258/0x300  
\[ 2134.195295\] -(0)\[0:swapper/0\]\[<ffffffc00093783c>\] rest\_init+0x80/0x8c  
\[ 2134.196100\] -(0)\[0:swapper/0\]\[<ffffffc000c5f96c>\] start\_kernel+0x380/0x398  
  
\[ 2134.196954\] -(2)\[1068:d.process.media\]machine\_restart, arm\_pm\_restart( (null))  
\[ 2134.197951\] -(2)\[1068:d.process.media\]ARCH\_RESET happen!!!========================================================================================================================================  
\[ 2134.198634\] -(2)\[1068:d.process.media\]arch\_reset: cmd = NULL  
\[ 2134.199341\] -(2)\[1068:d.process.media\]CPU: 2 PID: 1068 Comm: d.process.media Tainted: G W 3.18.22+ \#1  
\[ 2134.200618\] -(2)\[1068:d.process.media\]Hardware name: MT8163 (DT)  
\[ 2134.201367\] -(2)\[1068:d.process.media\]Call trace:  
\[ 2134.201956\] -(2)\[1068:d.process.media\]\[<ffffffc000087c28>\] dump\_backtrace+0x0/0x124  
\[ 2134.202909\] -(2)\[1068:d.process.media\]\[<ffffffc000087d5c>\] show\_stack+0x10/0x1c  
\[ 2134.203820\] -(2)\[1068:d.process.media\]\[<ffffffc00093ba40>\] dump\_stack+0x74/0xb8  
\[ 2134.204732\] -(2)\[1068:d.process.media\]\[<ffffffc0006a83c4>\] arch\_reset+0xec/0x118  
\[ 2134.205653\] -(2)\[1068:d.process.media\]\[<ffffffc0006a841c>\] mtk\_arch\_reset\_handle+0x2c/0x48  
\[ 2134.206684\] -(2)\[1068:d.process.media\]\[<ffffffc0000b5874>\] notifier\_call\_chain+0x68/0x11c  
\[ 2134.207703\] -(2)\[1068:d.process.media\]\[<ffffffc0000b5ab4>\] atomic\_notifier\_call\_chain+0x30/0x48  
\[ 2134.208788\] -(2)\[1068:d.process.media\]\[<ffffffc0000b6d5c>\] do\_kernel\_restart+0x1c/0x28  
\[ 2134.209775\] -(2)\[1068:d.process.media\]\[<ffffffc0000853fc>\] machine\_restart+0x5c/0x64  
\[ 2134.210740\] -(2)\[1068:d.process.media\]\[<ffffffc0000b6c70>\] emergency\_restart+0x14/0x20  
\[ 2134.211728\] -(2)\[1068:d.process.media\]\[<ffffffc00059a728>\] ipanic\_die+0x54/0xb8  
\[ 2134.212638\] -(2)\[1068:d.process.media\]\[<ffffffc0000b5874>\] notifier\_call\_chain+0x68/0x11c  
\[ 2134.213657\] -(2)\[1068:d.process.media\]\[<ffffffc0000b5ab4>\] atomic\_notifier\_call\_chain+0x30/0x48  
\[ 2134.214742\] -(2)\[1068:d.process.media\]\[<ffffffc0000b6100>\] notify\_die+0x30/0x3c  
\[ 2134.215653\] -(2)\[1068:d.process.media\]\[<ffffffc000087dfc>\] die+0x94/0x1a4  
\[ 2134.216500\] -(2)\[1068:d.process.media\]\[<ffffffc00093a728>\] \_\_do\_kernel\_fault.part.5+0x70/0x84  
\[ 2134.217563\] -(2)\[1068:d.process.media\]\[<ffffffc000091fd4>\] do\_page\_fault+0x250/0x254  
\[ 2134.218528\] -(2)\[1068:d.process.media\]\[<ffffffc000092094>\] do\_translation\_fault+0xbc/0xf0  
\[ 2134.219547\] -(2)\[1068:d.process.media\]\[<ffffffc000081290>\] do\_mem\_abort+0x38/0x9c  
\[ 2134.220479\] -(2)\[1068:d.process.media\]Exception stack(0xffffffc04c5eb810 to 0xffffffc04c5eb930)  
\[ 2134.234189\] -(2)\[1068:d.process.media\]\[<ffffffc000083c50>\] el1\_da+0x14/0x80  
\[ 2134.235058\] -(2)\[1068:d.process.media\]\[<ffffffc000941054>\] \_\_schedule+0x63c/0x70c  
\[ 2134.235990\] -(2)\[1068:d.process.media\]\[<ffffffc000941148>\] schedule+0x24/0x74  
\[ 2134.236880\] -(2)\[1068:d.process.media\]\[<ffffffc0009411a8>\] schedule\_preempt\_disabled+0x10/0x24  
\[ 2134.237954\] -(2)\[1068:d.process.media\]\[<ffffffc0000d9474>\] mutex\_optimistic\_spin+0x184/0x1c8  
\[ 2134.239005\] -(2)\[1068:d.process.media\]\[<ffffffc000942910>\] \_\_mutex\_lock\_slowpath+0x38/0x164  
\[ 2134.240046\] -(2)\[1068:d.process.media\]\[<ffffffc000942a80>\] mutex\_lock+0x44/0x64  
\[ 2134.240959\] -(2)\[1068:d.process.media\]\[<ffffffc000321bd4>\] pinctrl\_get\_device\_gpio\_range+0x4c/0xf8  
\[ 2134.242075\] -(2)\[1068:d.process.media\]\[<ffffffc000321c9c>\] pinctrl\_gpio\_direction+0x1c/0x8c  
\[ 2134.243117\] -(2)\[1068:d.process.media\]\[<ffffffc000323120>\] pinctrl\_gpio\_direction\_input+0xc/0x18  
\[ 2134.244213\] -(2)\[1068:d.process.media\]\[<ffffffc000327720>\] mtk\_gpio\_direction\_input+0x10/0x1c  
\[ 2134.245274\] -(2)\[1068:d.process.media\]\[<ffffffc00032b780>\] gpiod\_direction\_input+0x44/0x18c  
\[ 2134.246316\] -(2)\[1068:d.process.media\]\[<ffffffc0005c279c>\] i2c\_transfer\_byte.isra.2+0xa4/0x118  
\[ 2134.247389\] -(2)\[1068:d.process.media\]\[<ffffffc0005c2c28>\] i2c\_write\_buf.constprop.9+0x34/0x78  
\[ 2134.248463\] -(2)\[1068:d.process.media\]\[<ffffffc0005c2ddc>\] led\_time\_hrtimer\_func+0x60/0x108  
\[ 2134.249505\] -(2)\[1068:d.process.media\]\[<ffffffc0000f35a4>\] \_\_run\_hrtimer+0x78/0x260  
\[ 2134.250459\] -(2)\[1068:d.process.media\]\[<ffffffc0000f4318>\] hrtimer\_interrupt+0x108/0x2a0  
\[ 2134.251469\] -(2)\[1068:d.process.media\]\[<ffffffc0006e1488>\] arch\_timer\_handler\_phys+0x28/0x38  
\[ 2134.252521\] -(2)\[1068:d.process.media\]\[<ffffffc0000e72b8>\] handle\_percpu\_devid\_irq+0xa4/0x1a8  
\[ 2134.253583\] -(2)\[1068:d.process.media\]\[<ffffffc0000e354c>\] generic\_handle\_irq+0x30/0x4c  
\[ 2134.254580\] -(2)\[1068:d.process.media\]\[<ffffffc0000e35ec>\] \_\_handle\_domain\_irq+0x84/0xf0  
\[ 2134.255589\] -(2)\[1068:d.process.media\]\[<ffffffc000081418>\] gic\_handle\_irq+0x34/0x80  
\[ 2134.256542\] -(2)\[1068:d.process.media\]Exception stack(0xffffffc04c5ebeb0 to 0xffffffc04c5ebfd0)

\[ 2133.910735\] -(2)\[1068:d.process.media\]Internal error: Oops: 96000046 \[\#1\] PREEMPT SMP

这是提示抢占的错误，跟抢占调度有关。

BUG: scheduling while atomic: d.process.media/1068

这是明显提示：当进行原子操作时，执行了调度程序。而linux规定进行原子操作时不允许进行调度算法。、

原子操作在这里应该指的是需要一直占用cpu直到完成的代码块。

而看这个back trace可以看到栈底应该是一个IRQ中断函数（gic\_handle\_irq），而栈中有调用mutex\_lock函数，

这是一个互斥锁的代码（mutex\_optimistic\_spin，这是自旋锁），互斥锁，就是当锁被持有时就需要进入锁队列，

并进入休眠状态，就是从running状态转换为sleep状态，就是会放弃cpu，然后执行调度算法选择一个进程去运行。

可以看到，mutex\_lock中调用了schedule，肯定是跟调度有关的函数。最终调用了\_\_schedule\_bug，即出现了调度

异常。

\[ 2133.870205\] -(2)\[1068:d.process.media\]\[<ffffffc0000baec0>\] \_\_schedule\_bug+0x5c/0xd8  
\[ 2133.871159\] -(2)\[1068:d.process.media\]\[<ffffffc000941054>\] \_\_schedule+0x63c/0x70c  
\[ 2133.872092\] -(2)\[1068:d.process.media\]\[<ffffffc000941148>\] schedule+0x24/0x74  
\[ 2133.872981\] -(2)\[1068:d.process.media\]\[<ffffffc0009411a8>\] schedule\_preempt\_disabled+0x10/0x24  
\[ 2133.874055\] -(2)\[1068:d.process.media\]\[<ffffffc0000d9474>\] mutex\_optimistic\_spin+0x184/0x1c8  
\[ 2133.875106\] -(2)\[1068:d.process.media\]\[<ffffffc000942910>\] \_\_mutex\_lock\_slowpath+0x38/0x164  
\[ 2133.876146\] -(2)\[1068:d.process.media\]\[<ffffffc000942a80>\] mutex\_lock+0x44/0x64