全志R128内存泄露调试案例

只看该作者 · 2023-12-11 11:02

问题背景

[color=rgba(0, 0, 0, 0.87)]硬件：R128 软件：FreeRTOS + rtplayer_test(Cedarx)+ AudioSystem

问题复现

[color=rgba(0, 0, 0, 0.87)]复现步骤：

rtplayer_test /data/boot.mp3
串口输入"l", 循环播放
串口输入"b" , 播放器后台执行

具体表现

[color=rgba(0, 0, 0, 0.87)]rtplayer_test 循环播放老化音频十几分钟后，音乐停止播放，报错如下：

[color=rgba(0, 0, 0, 0.87)][color=var(--md-typeset-a-color)]

问题分析

根据上面报错的log,播放停止时，系统内存不足；在老化过程中出现的内存不足，一般是某处存在内存泄漏
reboot重启，重新执行老化播放流程，串口执行free命令，观察内存的剩余情况：

[color=rgba(0, 0, 0, 0.87)]首次播放时的内存：

code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">c906>free==> Round [1] <==Total Heap Size : 1907128 Bytes ( 1862 KB) Free : 547632 Bytes ( 534 KB) Min Free : 536208 Bytes ( 523 KB) List Task MIN Free Stack(unit: word)Task State Priority Stack #************************************************Name State Pri HWM Idx StkCur StkBotadb-shell X 4 394 44 0x87233a0 0x8722650AudioDecode R 4 3872 49 0x874d2c0 0x87459c0IDLE R 0 52 2 0x863dfe0 0x863de40tcpip B 3 470 12 0x8677ae0 0x8676c30Demux B 6 3126 47 0x87333a0 0x872b960usb-hardware-sc B 6 8018 14 0x871a3a0 0x870a630adbd-input B 5 900 24 0x876eb90 0x876cec0amp-admin B 6 4002 11 0x8675ab0 0x866dda0AudioMT2pb B 4 3882 52 0x8779be0 0x8772050AudioRender B 6 3350 50 0x8756950 0x874ed30amp-ser2 B 6 4006 8 0x865d830 0x8655b00amp-ser3 B 6 4006 9 0x8665910 0x865dbe0amp-ser4 B 6 4006 10 0x866d9f0 0x8665cc0hub-main-thread B 6 8082 13 0x870a2b0 0x86fa620adbd-shell-ser- B 4 906 45 0x8726330 0x8724660XPlayer B 4 3912 48 0x8744e10 0x873d220AudioMT2 B 4 1907 18 0x873cb00 0x8738e10RTplayerThread B 4 3989 51 0x876a630 0x8762980CLI B 6 3772 15 0x8722060 0x871a640Tmr Svc B 6 374 3 0x863f070 0x863e320amp-send-task B 6 930 4 0x8642db0 0x8641070amp-recv-task B 6 924 5 0x8644e90 0x8643150adbd-output B 5 843 25 0x8770cd0 0x876f060adb-event B 5 894 46 0x872a300 0x87286d0amp-ser0 B 6 4006 6 0x864d670 0x8645940amp-ser1 B 6 4006 7 0x8655750 0x864da20

[color=rgba(0, 0, 0, 0.87)]播放几次后的内存情况：

code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">c906>free==> Round [1] <==Total Heap Size : 1907128 Bytes ( 1862 KB) Free : 456992 Bytes ( 446 KB) Min Free : 453440 Bytes ( 442 KB) List Task MIN Free Stack(unit: word)Task State Priority Stack #************************************************Name State Pri HWM Idx StkCur StkBotadb-shell X 4 394 44 0x87235b0 0x8722650AudioDecode R 4 3872 49 0x874d5e0 0x87459c0IDLE R 0 52 2 0x863dfe0 0x863de40tcpip B 3 458 12 0x8677ae0 0x8676c30usb-hardware-sc B 6 8018 14 0x871a3a0 0x870a630adbd-input B 5 900 24 0x876eb90 0x876cec0amp-admin B 6 4002 11 0x8675ab0 0x866dda0AudioMT2pb B 4 3882 52 0x8779be0 0x8772050AudioRender B 6 3350 50 0x8756950 0x874ed30CLI B 6 3772 15 0x8722060 0x871a640Tmr Svc B 6 374 3 0x863f070 0x863e320amp-ser0 B 6 4006 6 0x864d670 0x8645940amp-ser1 B 6 4006 7 0x8655750 0x864da20amp-ser2 B 6 4006 8 0x865d830 0x8655b00amp-ser3 B 6 4006 9 0x8665910 0x865dbe0amp-ser4 B 6 4006 10 0x866d9f0 0x8665cc0hub-main-thread B 6 8082 13 0x870a2b0 0x86fa620XPlayer B 4 3912 48 0x8744e10 0x873d220AudioMT2 B 4 1907 18 0x873cb00 0x8738e10adbd-output B 5 843 25 0x8770cd0 0x876f060amp-recv-task B 6 924 5 0x8644e90 0x8643150Demux B 6 3126 47 0x8733150 0x872b960amp-send-task B 6 924 4 0x8642db0 0x8641070adb-event B 5 890 46 0x872a2a0 0x87286d0adbd-shell-ser- B 4 906 45 0x8726330 0x8724660RTplayerThread B 4 3989 51 0x876a630 0x8762980

[color=rgba(0, 0, 0, 0.87)]观察Free项的剩余内存，可发现在老化播放过程中，内存不断减少，存在泄漏。

泄漏点定位

[color=rgba(0, 0, 0, 0.87)]可借助memleak工具，定位内存泄漏处。mrtos menuconfig选上memleak

code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">-> System components -> aw components -> Memleak Components Support

Tina RTOS Memleak # 使能内存泄露分析工具 (16) Tina RTOS Memleak Backtrace Level # 内存泄露分析栈回溯层数 [ ] Tina RTOS Double Free Check

[color=rgba(0, 0, 0, 0.87)]memleak用法如下

code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">作用：内存泄露分析用法：memleak 1 使能内存泄露分析，记录所有内存块申请、释放信息memleak 0 关闭内存泄露分析，删除所有内存块的申请、释放信息memleak 1 thread_name1 thread_name2 使能内存泄露分析，记录指定任务的内存块申请、释放信息

[color=rgba(0, 0, 0, 0.87)]串口执行memleak 1

[color=rgba(0, 0, 0, 0.87)]音频老化测试（参考复现步骤），音频播放几次后，执行rtpc q 命令退出播放

[color=rgba(0, 0, 0, 0.87)]串口执行memleak 0

[color=rgba(0, 0, 0, 0.87)]关闭内存泄露检测时，会打印可疑的内存泄露点及其回溯信息;

[color=rgba(0, 0, 0, 0.87)]有两个地方：

code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;"> 007: ptr = 0x08760960, size = 0x00000f00, thread = AudioRender backtrace : 0x08336AEE backtrace : 0x08336B46 backtrace : 0x08396D52 backtrace : 0x084B025E backtrace : 0x08446856 backtrace : 0x084496C6 008: ptr = 0x0875f990, size = 0x00000f00, thread = AudioRender backtrace : 0x08336AEE backtrace : 0x08336B46 backtrace : 0x0839757E backtrace : 0x084B025E backtrace : 0x08446856 backtrace : 0x084496C6

[color=rgba(0, 0, 0, 0.87)]callstack 回溯

code" style="box-sizing: inherit; -webkit-tap-highlight-color: transparent; font-size: inherit; font-family: inherit; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-width: 0px; border-style: initial; border-color: initial; position: absolute; top: 0.5em; right: 0.5em; z-index: 1; width: 1.5em; height: 1.5em; border-radius: 0.1rem; outline: none; outline-offset: 0.1rem; cursor: pointer; transition: color 0.25s ease 0s;">pvPortMalloc at /workspace/freertos/r128/test_0624_rtplayer/rtos-dev/lichee/rtos/kernel/FreeRTOS-orig/Source/portable/MemMang/heap_4.c:658pvPortCalloc at /workspace/freertos/r128/test_0624_rtplayer/rtos-dev/lichee/rtos/kernel/FreeRTOS-orig/Source/portable/MemMang/heap_4.c:577softvol_ap_update_mode at /workspace/freertos/r128/test_0624_rtplayer/rtos-dev/lichee/rtos/components/common/aw/AudioSystem/audio_plugin/softvolume.c:250_AudioTrackStart at //workspace/rtos-r128/lichee/rtos/components/common/aw/AudioSystem/AudioTrack.c:163RTSoundDeviceStart at /workspace/codec_lib/cedarx_rtos/temp/rtos_cedarx/cedarx/rtos_out/libcore/playback/src/rtosSoundControl.c:766startSoundDevice at /workspace/codec_lib/cedarx_rtos/temp/rtos_cedarx/cedarx/rtos_out/libcore/playback/src/audioRenderComponent.c:800 (inlined by) doRender at /workspace/codec_lib/cedarx_rtos/temp/rtos_cedarx/cedarx/rtos_out/libcore/playback/src/audioRenderComponent.c:942 (inlined by) doRender at /workspace/codec_lib/cedarx_rtos/temp/rtos_cedarx/cedarx/rtos_out/libcore/playback/src/audioRenderComponent.c:898

[color=rgba(0, 0, 0, 0.87)]通过回溯信息，发现在resample_ap_update_mode处产生了内存泄漏。

根本原因

[color=rgba(0, 0, 0, 0.87)]播放器老化过程中，只调用AudioTrackCreate一次，循环播放时会多次调用_AudioTrackStart，最后退出播放才调用AudioTrackDestroy销毁；所以softvol_ap_update_mode这里，老化过程会多次调用到，会有多次分配，但只在退出时AudioTrackDestroy里才销毁。

解决方法

[color=rgba(0, 0, 0, 0.87)]只在AudioTrackCreateWithStream时创建一次，AudioTrackDestroy，测试10小时左右未出现内存泄漏[color=var(--md-typeset-a-color)]

全志R128内存泄露调试案例

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