The crash dump and logs[1] from my dev environment.


> Do you always get the "stream is not writable" error before the JVM
> performs the crash-dump?
Yes but only in the Tomcat of the production environment.

Best regards,
Eduardo Quintanilla
Software Developer

From: Christopher Schultz <>
Sent: jueves, 22 de agosto de 2019 8:25 a. m.
Subject: Re: Tomcat 8.5 - Native Library - Crash


On 8/21/19 17:36, Eduardo Quintanilla wrote:
> We have been getting some crashes in Tomcat 8.5.43 lately.
> The environment is: * JDK 1.8.0_202 * Windows Server 2012 R2
> The logs shows a tcnative exception.
> Crash Log: Current thread JavaThread
> "https-openssl-apr-8081-exec-298" daemon _thread_in_native Java
> frames: (J=compiled Java code, j=interpreted, Vv=VM code) J 15034
> org.apache.tomcat.jni.Socket.sendb(JLjava/nio/ByteBuffer;II)I (0
> bytes) @ 0x0000000002962ddf [0x0000000002962d80+0x5f] J 29164 C2
> (242 bytes) @ 0x0000000006d6933c [0x0000000006d68b20+0x81c] J 27479
> C2 (20
> bytes) @ 0x00000000053f6144 [0x00000000053f60a0+0xa4] J 24666 C2
> org.apache.coyote.http2.Http2OutputBuffer.doWrite(Ljava/nio/ByteBuffer
> (28 bytes) @ 0x0000000006b51b74 [0x0000000006b51660+0x514] J 24689
> C2 org.apache.catalina.connector.OutputBuffer.writeBytes([BII)V (38
> bytes) @ 0x00000000031c09f8 [0x00000000031c04c0+0x538] J 27348 C2
> org.apache.catalina.connector.CoyoteOutputStream.write([BII)V (26
> bytes) @ 0x00000000071d51a8 [0x00000000071d5120+0x88]

What's the actual error? Can you post the entire crash dump?

> Tomcat logs: org.apache.catalina.connector.ClientAbortException:
> org.apache.coyote.CloseNowException: Connection [214], Stream
> [279], This stream is not writable

Do you always get the "stream is not writable" error before the JVM
performs the crash-dump?

I believe there is at least one lingering SEGV hiding in
Socket.sendb(), possibly only on Windows. I don't have a Windows
development environment to be able to disassemble the crash dump and
locate the line of code being executed when the SEGV occurs, so I have
added NULL-checks to everything I can find in there but it looks like
it's not enough. Something is missing, somewhere.


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