[SSHD-72] Deadlock in ChannelOutputStream

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Not A Problem
• Assignee: Shawn Pearce
• Reporter: Shawn Pearce
• Created: 09/Jan/10 00:02
• Updated: 02/May/13 02:29
• Resolved: 09/Jan/10 02:48

Description

Its possible for ChannelOutputStream to cause an NioProcessor to deadlock.

ChannelOutputStream takes and holds the lock on itself during write(), flush() and close().

The AbstractSession tries to take the lock on ChannelOutputStream when it calls close() when a client disconnects and a stream is still active.

If the ChannelOutputStream writes the full window size, during flush(), while the lock is held, it goes to sleep until the window notifies it of having more data available. With the lock held, the NioProcessor can't call close(), and deadlocks.

Issue Links

• depends upon: SSHD-73 Infinite loop in ChannelOutputStream