Date: Tue, 8 May 2007 13:31:46 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: stable@FreeBSD.org Subject: UNIX domain sockets MFC's Message-ID: <20070508132149.A24765@fledge.watson.org>
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Dear all, I have just completed the merge of a significant number of UNIX domain socket bug fixes and cleanups from HEAD to RELENG_6. While my hope is that these are generally low-risk, and should improve UNIX domain socket stability and performance under load, there were quite a few changes involved. As such, please keep an eye out for any new problems with UNIX domain sockets, and drop me an e-mail if you run into any. The changes in the recent MFC spree include: - Additional MAC check for UNIX domain socket connect(). - Cleanup of structure, comments, white space, and consolidation of uipc_proto.c into uipc_usrreq.c. Removal of redundant code. - Fixed races involving simultaneous bind() and connect() between two threads or processes on the same UNIX domain socket. - Reduced period of overlapped acquisition of socket buffer mutexes during send/receive, which should lower lock contention under load. Right now I am tracking two known issues with UNIX domain sockets in RELENG_6: - Reported NULL point derference in unp_connect(), which occurs due to the dropping of locks around sonewconn(). This is fixed in HEAD, and I am preparing an MFC of this patch. - Reported UNIX domain socket connection leak. This is not yet fully diagnosed. Robert N M Watson Computer Laboratory University of Cambridge
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