StackTrace not correct when exception caught

[elevenxt]

In method ChannelOutboundBuffer.FailFlushed, the statement "this.Remove0(cause, notify)" appends some same text to variable cause.StackTrace in each loop, when this statement loops for many times, the variable cause.StackTrace reachs hundreds of lines.
we can fix this by change statement from "if (!this.Remove0(cause, notify))" to "if (!this.Remove0(new Exception("fail flush", cause), notify))".