bug

doc/bugs/occasional_hang_with_p2pstdio.mdwn

@@ -0,0 +1,31 @@
+Using git annex get -J20 of 1000 files from ssh remote on localhost,
+I've thrice observed it to hang.
+
+	get 99 (from origin...) (checksum...) ok
+	get 992 (from origin...) (checksum...) ok
+	get 991 (from origin...) (checksum...) ok
+	get 993 (from origin...) (checksum...) ok
+	get 995 (from origin...) (checksum...) ok
+	get 1000 (from origin...) 
+	get 1 (from origin...) 
+	get 10 (from origin...) 
+	get 108 (from origin...) 
+	get 105 (from origin...) 
+	[some more]
+
+It seems it's trying to receive content of the last files listed, but has
+hung somehow in the P2P protocol and not received the data. 
+Those are the only files not present. --[[Joey]]
+
+The particular set of files it stalls on seems somewhat deterministic;
+the sets have been the same at least twice.
+
+Looking at --debug, it does not seem to get to the point of sending a P2P
+request for the keys of the files that it stalls on.
+
+So, a bug setting up the P2P ssh connection, it seems.
+
+Interestingly, the debug log shows it only ran git-annex-shell p2pstdio 
+6 times, despite the concurrency of 20. So, the other 14 must have stalled
+setting up the connection. Suggests the bug is in the connection pool
+code.