全志R128内存泄漏调试案例分享

问题背景硬件：R128 软件：FreeRTOS + rtplayer_test(Cedarx)+ AudioSystem问题复现复现步骤：1.rtplayer_test /data/boot.mp3 2.串口输入"l", 循环播放 3.串口输入"b" , 播放器后台执行具体表现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：问题分析1.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 2.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：首次播放时的内存：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 StkBot adb-shell X 4 394 44 0x87233a0 0x8722650 AudioDecode R 4 3872 49 0x874d2c0 0x87459c0 IDLE R 0 52 2 0x863dfe0 0x863de40 tcpip B 3 470 12 0x8677ae0 0x8676c30 Demux B 6 3126 47 0x87333a0 0x872b960 usb-hardware-sc B 6 8018 14 0x871a3a0 0x870a630 adbd-input B 5 900 24 0x876eb90 0x876cec0 amp-admin B 6 4002 11 0x8675ab0 0x866dda0 AudioMT2pb B 4 3882 52 0x8779be0 0x8772050 AudioRender B 6 3350 50 0x8756950 0x874ed30 amp-ser2 B 6 4006 8 0x865d830 0x8655b00 amp-ser3 B 6 4006 9 0x8665910 0x865dbe0 amp-ser4 B 6 4006 10 0x866d9f0 0x8665cc0 hub-main-thread B 6 8082 13 0x870a2b0 0x86fa620 adbd-shell-ser- B 4 906 45 0x8726330 0x8724660 XPlayer B 4 3912 48 0x8744e10 0x873d220 AudioMT2 B 4 1907 18 0x873cb00 0x8738e10 RTplayerThread B 4 3989 51 0x876a630 0x8762980 CLI B 6 3772 15 0x8722060 0x871a640 Tmr Svc B 6 374 3 0x863f070 0x863e320 amp-send-task B 6 930 4 0x8642db0 0x8641070 amp-recv-task B 6 924 5 0x8644e90 0x8643150 adbd-output B 5 843 25 0x8770cd0 0x876f060 adb-event B 5 894 46 0x872a300 0x87286d0 amp-ser0 B 6 4006 6 0x864d670 0x8645940 amp-ser1 B 6 4006 7 0x8655750 0x864da20 播放几次后的内存情况：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 StkBot adb-shell X 4 394 44 0x87235b0 0x8722650 AudioDecode R 4 3872 49 0x874d5e0 0x87459c0 IDLE R 0 52 2 0x863dfe0 0x863de40 tcpip B 3 458 12 0x8677ae0 0x8676c30 usb-hardware-sc B 6 8018 14 0x871a3a0 0x870a630 adbd-input B 5 900 24 0x876eb90 0x876cec0 amp-admin B 6 4002 11 0x8675ab0 0x866dda0 AudioMT2pb B 4 3882 52 0x8779be0 0x8772050 AudioRender B 6 3350 50 0x8756950 0x874ed30 CLI B 6 3772 15 0x8722060 0x871a640 Tmr Svc B 6 374 3 0x863f070 0x863e320 amp-ser0 B 6 4006 6 0x864d670 0x8645940 amp-ser1 B 6 4006 7 0x8655750 0x864da20 amp-ser2 B 6 4006 8 0x865d830 0x8655b00 amp-ser3 B 6 4006 9 0x8665910 0x865dbe0 amp-ser4 B 6 4006 10 0x866d9f0 0x8665cc0 hub-main-thread B 6 8082 13 0x870a2b0 0x86fa620 XPlayer B 4 3912 48 0x8744e10 0x873d220 AudioMT2 B 4 1907 18 0x873cb00 0x8738e10 adbd-output B 5 843 25 0x8770cd0 0x876f060 amp-recv-task B 6 924 5 0x8644e90 0x8643150 Demux B 6 3126 47 0x8733150 0x872b960 amp-send-task B 6 924 4 0x8642db0 0x8641070 adb-event B 5 890 46 0x872a2a0 0x87286d0 adbd-shell-ser- B 4 906 45 0x8726330 0x8724660 RTplayerThread B 4 3989 51 0x876a630 0x8762980 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。泄漏点定位可借助memleak工具，定位内存泄漏处。mrtos menuconfig选上memleak- > 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 memleak用法如下作用：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、释放信息串口执行memleak 1音频老化测试（参考复现步骤），音频播放几次后，执行rtpc q 命令退出播放串口执行memleak 0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;有两个地方：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 callstack 回溯pvPortMalloc at /workspace/freertos/r128/test_0624_rtplayer/rtos-dev/lichee/rtos/kernel/FreeRTOS-orig/Source/portable/MemMang/heap_4.c:658 pvPortCalloc at /workspace/freertos/r128/test_0624_rtplayer/rtos-dev/lichee/rtos/kernel/FreeRTOS-orig/Source/portable/MemMang/heap_4.c:577 softvol_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:163 RTSoundDeviceStart at /workspace/codec_lib/cedarx_rtos/temp/rtos_cedarx/cedarx/rtos_out/libcore/playback/src/rtosSoundControl.c:766 startSoundDevice 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 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。解决方法只在AudioTrackCreateWithStream时创建一次，AudioTrackDestroy，测试10小时左右未出现内存泄漏