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A deadlock occurred when I used multithread to exchange rtsp to rtmp. #1717

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somnmos opened this issue Nov 4, 2021 · 3 comments
Closed

A deadlock occurred when I used multithread to exchange rtsp to rtmp. #1717

somnmos opened this issue Nov 4, 2021 · 3 comments
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@somnmos
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somnmos commented Nov 4, 2021 •
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################### Enviroments ###################
OS:

    CentOS Linux release 7.3.1611 (Core)

SRS:

    ossrs/srs:v3.0.156

JavaCV:

    <dependency>
        <groupId>org.bytedeco</groupId>
        <artifactId>javacv-platform</artifactId>
        <version>1.5.6</version>
    </dependency>

################################################

#################### Problems ####################

"pool-2-thread-10" #76 prio=5 os_prio=0 tid=0x00007f05a8052000 nid=0x1e3a waiting for monitor entry [0x00007f05c26a6000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:846)
	- waiting to lock <0x0000000080560d90> (a java.lang.Class for org.bytedeco.ffmpeg.global.avcodec)
	at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:841)
	at com.sugon.video.utils.Rtsp2RtmpTask.startGrabber(Rtsp2RtmpTask.java:70)
	at com.sugon.video.utils.Rtsp2RtmpTask.run(Rtsp2RtmpTask.java:42)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

   Locked ownable synchronizers:
	- <0x00000005cd400fd8> (a java.util.concurrent.ThreadPoolExecutor$Worker)

"pool-2-thread-9" #73 prio=5 os_prio=0 tid=0x00007f05b4084000 nid=0x19f2 waiting for monitor entry [0x00007f05c27a7000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:846)
	- waiting to lock <0x0000000080560d90> (a java.lang.Class for org.bytedeco.ffmpeg.global.avcodec)
	at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:841)
	at com.sugon.video.utils.Rtsp2RtmpTask.startGrabber(Rtsp2RtmpTask.java:70)
	at com.sugon.video.utils.Rtsp2RtmpTask.run(Rtsp2RtmpTask.java:42)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

   Locked ownable synchronizers:
	- <0x00000005cbbd5050> (a java.util.concurrent.ThreadPoolExecutor$Worker)

"pool-2-thread-8" #69 prio=5 os_prio=0 tid=0x00007f05b0038000 nid=0x949 waiting for monitor entry [0x00007f05c28a8000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:846)
	- waiting to lock <0x0000000080560d90> (a java.lang.Class for org.bytedeco.ffmpeg.global.avcodec)
	at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:841)
	at com.sugon.video.utils.Rtsp2RtmpTask.startGrabber(Rtsp2RtmpTask.java:70)
	at com.sugon.video.utils.Rtsp2RtmpTask.run(Rtsp2RtmpTask.java:42)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

   Locked ownable synchronizers:
	- <0x00000005c92ae2c0> (a java.util.concurrent.ThreadPoolExecutor$Worker)

"pool-2-thread-7" #67 prio=5 os_prio=0 tid=0x00007f05b4025000 nid=0x7d9 runnable [0x00007f05c29a9000]
   java.lang.Thread.State: RUNNABLE
	at org.bytedeco.ffmpeg.global.avformat.avformat_find_stream_info(Native Method)
	at org.bytedeco.javacv.FFmpegFrameGrabber.startUnsafe(FFmpegFrameGrabber.java:928)
	- locked <0x00000005c883bec8> (a org.bytedeco.javacv.FFmpegFrameGrabber)
	at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:846)
	- locked <0x0000000080560d90> (a java.lang.Class for org.bytedeco.ffmpeg.global.avcodec)
	at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:841)
	at com.sugon.video.utils.Rtsp2RtmpTask.startGrabber(Rtsp2RtmpTask.java:70)
	at com.sugon.video.utils.Rtsp2RtmpTask.run(Rtsp2RtmpTask.java:42)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

   Locked ownable synchronizers:
	- <0x00000005c8795320> (a java.util.concurrent.ThreadPoolExecutor$Worker)

################################################
@somnmos somnmos changed the title A deadlock occurred when I used multithread to exchange rtsp to rtmp。 A deadlock occurred when I used multithread to exchange rtsp to rtmp. Nov 4, 2021
@somnmos
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somnmos commented Nov 4, 2021

image

can anybody help me.

@saudet
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saudet commented Nov 4, 2021

Call startUnsafe() instead of start().

@saudet
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saudet commented Nov 4, 2021

Duplicate of #1139

@saudet saudet marked this as a duplicate of #1139 Nov 4, 2021
@saudet saudet closed this as completed Nov 4, 2021
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