Allwinner R128 memory leak debugging case

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Allwinner R128 memory leak debugging case [Copy link]

 

# Memory leak debugging case## Problem background Hardware: R128 Software: FreeRTOS + rtplayer_test(Cedarx)+ AudioSystem ## Problem reproduction Reproduction steps: 1. rtplayer_test /data/boot.mp3 2. Serial port input "l", loop playback 3. Serial port input "b", player background execution## Specific performance After rtplayer_test loops and plays the aging audio for more than ten minutes, the music stops playing and the error is as follows:  ## Problem analysis1. According to the error log above, the system is out of memory when playback stops; insufficient memory during the aging process is generally caused by a memory leak somewhere2. reboot, re-execute the aging playback process, execute the free command on the serial port, and observe the remaining memory: Memory during first playback: ``` 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 0x8 76cec0 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 0x86410 70 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 ``` Memory usage after playing several times: ```language 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 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 0x871 a640 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 0x86fa6 20 843 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 `` ` Observe the remaining memory of the Free item and you will find that the memory is decreasing during the aging playback process, indicating a leak. ### You can use the memleak tool to locate the memory leak. Select memleak in mrtos menuconfig ``` -> System components -> aw components -> Memleak Components Support [*] Tina RTOS Memleak # Enable memory leak analysis tool (16) Tina RTOS Memleak Backtrace Level # Memory leak analysis stack backtrace level [ ] Tina RTOS Double Free Check ``` memleak usage is as follows```language Function: memory leak analysis Usage: memleak 1 Enable memory leak analysis, record all memory block application and release information memleak 0 Disable memory leak analysis, delete all memory Block application and release information memleak 1 thread_name1 thread_name2 Enable memory leak analysis and record the memory block application and release information of the specified task. ``` Serial port executes memleak 1 Audio aging test (refer to the reproduction steps), after the audio is played several times, execute rtpc q command quits playing serial port execution memleak 0 When memory leak detection is turned off, suspicious memory leak points and their backtrace information will be printed; there are two places: ``` 007: ptr = 0x08760960, size = 0x00000f00,thread = AudioRender backtrace : 0x08336AEE backtrace : 0x08336B46 backtrace : 0x08396D52 backtrace : 0x08446856 backtrace : 0x084496C6 008: ptr = 0x0875f990, size = 0x0000 0f00, thread = AudioRender backtrace : 0x08336AEE backtrace : 0x08336B46 backtrace : 0x0839757E backtrace : 0x084B025E backtrace : 0x08446856 backtrace : 0x084496C6 ``` callstack traceback``` 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 ``` Through the backtrace information, it was found that a memory leak occurred at `resample_ap_update_mode`. ## Root cause player During the aging process, `AudioTrackCreate` is called only once. During loop playback, `_AudioTrackStart` is called multiple times, and finally, `AudioTrackDestroy` is called to destroy it when the playback is exited; so `softvol_ap_update_mode` is called multiple times during the aging process, and there will be multiple Allocated, but only destroyed in AudioTrackDestroy on exit. ## Solution: Create it only once during `AudioTrackCreateWithStream`, and `AudioTrackDestroy`. After testing for about 10 hours, no memory leak occurred! [Insert picture description here](https://img-blog.csdnimg.cn/direct/395d1f45c087449d8abcf5f83bc93f07. jpeg#pic_center)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 ``` Through the backtrace information, it was found that a memory leak occurred at `resample_ap_update_mode`. ## Root cause player During the aging process, `AudioTrackCreate` is called only once. During loop playback, `_AudioTrackStart` is called multiple times, and finally, `AudioTrackDestroy` is called to destroy it when the playback is exited; so `softvol_ap_update_mode` is called multiple times during the aging process, and there will be multiple Allocated, but only destroyed in AudioTrackDestroy on exit. ## Solution: Create it only once during `AudioTrackCreateWithStream`, and `AudioTrackDestroy`. After testing for about 10 hours, no memory leak occurred! [Insert picture description here](https://img-blog.csdnimg.cn/direct/395d1f45c087449d8abcf5f83bc93f07. jpeg#pic_center)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 ``` Through the backtrace information, it was found that a memory leak occurred at `resample_ap_update_mode`. ## Root cause player During the aging process, `AudioTrackCreate` is called only once. During loop playback, `_AudioTrackStart` is called multiple times, and finally, `AudioTrackDestroy` is called to destroy it when the playback is exited; so `softvol_ap_update_mode` is called multiple times during the aging process, and there will be multiple Allocated, but only destroyed in AudioTrackDestroy on exit. ## Solution: Create it only once during `AudioTrackCreateWithStream`, and `AudioTrackDestroy`. After testing for about 10 hours, no memory leak occurred! [Insert picture description here](https://img-blog.csdnimg.cn/direct/395d1f45c087449d8abcf5f83bc93f07. jpeg#pic_center)