- if (LOG.isTraceEnabled()) {
- LOG.trace("Ssh write request finished on channel: {} with result: {}: and ex:{}, message: {}",
- ctx.channel(), future.isWritten(), future.getException(), byteBufToString(byteBufMsg));
- }
-
- // Notify success or failure
- if (future.isWritten()) {
- promise.setSuccess();
- } else {
- LOG.warn("Ssh write request failed on channel: {} for message: {}", ctx.channel(), byteBufToString(byteBufMsg), future.getException());
- promise.setFailure(future.getException());
+ // synchronized block due to deadlock that happens on ssh window resize
+ // writes and pending writes would lock the underlyinch channel session
+ // window resize write would try to write the message on an already locked channelSession,
+ // while the pending write was in progress from the write callback
+ synchronized (asyncIn) {
+ if (LOG.isTraceEnabled()) {
+ LOG.trace("Ssh write request finished on channel: {} with result: {}: and ex:{}, message: {}",
+ ctx.channel(), future.isWritten(), future.getException(), byteBufToString(byteBufMsg));
+ }
+
+ // Notify success or failure
+ if (future.isWritten()) {
+ promise.setSuccess();
+ } else {
+ LOG.warn("Ssh write request failed on channel: {} for message: {}", ctx.channel(), byteBufToString(byteBufMsg), future.getException());
+ promise.setFailure(future.getException());
+ }
+
+ // Not needed anymore, release
+ byteBufMsg.release();
+
+ //rescheduling message from queue after successfully sent
+ if (wasPending) {
+ byteBufMsg.resetReaderIndex();
+ pending.remove();
+ }