Unhandled backend message was encountered

java.io.IOException: Broken pipe
--
at java.base/sun.nio.ch.FileDispatcherImpl.write0(Native Method)
at java.base/sun.nio.ch.SocketDispatcher.write(Unknown Source)
at java.base/sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source)
at java.base/sun.nio.ch.IOUtil.write(Unknown Source)
at java.base/sun.nio.ch.IOUtil.write(Unknown Source)
at java.base/sun.nio.ch.UnixAsynchronousSocketChannelImpl.finishWrite(Unknown Source)
at java.base/sun.nio.ch.UnixAsynchronousSocketChannelImpl.finish(Unknown Source)
at java.base/sun.nio.ch.UnixAsynchronousSocketChannelImpl.onEvent(Unknown Source)
at java.base/sun.nio.ch.EPollPort$EventHandlerTask.run(Unknown Source)
at java.base/sun.nio.ch.AsynchronousChannelGroupImpl$1.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
at delay @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.go$2$anonfun$1(SocketPlatform.scala:139)
at async @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.go$2(SocketPlatform.scala:139)
at flatMap @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.go$2(SocketPlatform.scala:143)
at apply @ skunk.util.Pool$.poolImpl$1(Pool.scala:88)
java.io.IOException: Broken pipe
at java.base/sun.nio.ch.FileDispatcherImpl.write0(Native Method)
at java.base/sun.nio.ch.SocketDispatcher.write(Unknown Source)
at java.base/sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source)
at java.base/sun.nio.ch.IOUtil.write(Unknown Source)
at java.base/sun.nio.ch.IOUtil.write(Unknown Source)
at java.base/sun.nio.ch.UnixAsynchronousSocketChannelImpl.finishWrite(Unknown Source)
at java.base/sun.nio.ch.UnixAsynchronousSocketChannelImpl.finish(Unknown Source)
at java.base/sun.nio.ch.UnixAsynchronousSocketChannelImpl.onEvent(Unknown Source)
at java.base/sun.nio.ch.EPollPort$EventHandlerTask.run(Unknown Source)
at java.base/sun.nio.ch.AsynchronousChannelGroupImpl$1.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
at delay @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.go$2$anonfun$1(SocketPlatform.scala:139)
at async @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.go$2(SocketPlatform.scala:139)
at flatMap @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.go$2(SocketPlatform.scala:143)
at apply @ skunk.util.Pool$.poolImpl$1(Pool.scala:88)
java.io.IOException: Broken pipe
at java.base/sun.nio.ch.FileDispatcherImpl.write0(Native Method)
at java.base/sun.nio.ch.SocketDispatcher.write(Unknown Source)
at java.base/sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source)
at java.base/sun.nio.ch.IOUtil.write(Unknown Source)
at java.base/sun.nio.ch.IOUtil.write(Unknown Source)
at java.base/sun.nio.ch.UnixAsynchronousSocketChannelImpl.finishWrite(Unknown Source)
at java.base/sun.nio.ch.UnixAsynchronousSocketChannelImpl.finish(Unknown Source)
at java.base/sun.nio.ch.UnixAsynchronousSocketChannelImpl.onEvent(Unknown Source)
at java.base/sun.nio.ch.EPollPort$EventHandlerTask.run(Unknown Source)
at java.base/sun.nio.ch.AsynchronousChannelGroupImpl$1.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
at delay @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.go$2$anonfun$1(SocketPlatform.scala:139)
at async @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.go$2(SocketPlatform.scala:139)
at flatMap @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.go$2(SocketPlatform.scala:143)
at apply @ skunk.util.Pool$.poolImpl$1(Pool.scala:88)
🔥  An unhandled backend message was encountered
🔥    at /home/runner/work/skunk/skunk/modules/core/shared/src/main/scala/net/protocol/Close.scala:40
🔥
🔥    Message: ErrorResponse(F -> postgres.c, M -> terminating connection due to
🔥             administrator command, V -> FATAL, L -> 3096, C -> 57P01, R ->
🔥             ProcessInterrupts, S -> FATAL
🔥
🔥  This is an implementation error in Skunk.
🔥  Please report a bug with the full contents of this error message.
skunk.exception.ProtocolError: ErrorResponse(F -> postgres.c, M -> terminating connection due to administrator command, V -> FATAL, L -> 3096, C -> 57P01, R -> ProcessInterrupts, S -> FATAL
java.io.IOException: Broken pipe
at java.base/sun.nio.ch.FileDispatcherImpl.write0(Native Method)
at java.base/sun.nio.ch.SocketDispatcher.write(Unknown Source)
at java.base/sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source)
at java.base/sun.nio.ch.IOUtil.write(Unknown Source)
at java.base/sun.nio.ch.IOUtil.write(Unknown Source)
at java.base/sun.nio.ch.UnixAsynchronousSocketChannelImpl.finishWrite(Unknown Source)
at java.base/sun.nio.ch.UnixAsynchronousSocketChannelImpl.finish(Unknown Source)
at java.base/sun.nio.ch.UnixAsynchronousSocketChannelImpl.onEvent(Unknown Source)
at java.base/sun.nio.ch.EPollPort$EventHandlerTask.run(Unknown Source)
at java.base/sun.nio.ch.AsynchronousChannelGroupImpl$1.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
at delay @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.go$2$anonfun$1(SocketPlatform.scala:139)
at async @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.go$2(SocketPlatform.scala:139)
at flatMap @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.go$2(SocketPlatform.scala:143)
at apply @ skunk.util.Pool$.poolImpl$1(Pool.scala:88)

Start by reading modules/core/shared/src/main/scala/net/protocol/Close.scala at line 40 and trace how PostgreSQL ErrorResponse messages and the broken-pipe exception reach that path. The issue does not define the desired behavior, so first establish the expected handling and a reproducible test case; done should include agreed behavior and regression coverage for this backend message.