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From: John Baldwin <jhb@FreeBSD.org>
Date: Wed, 22 Aug 2012 20:02:42 +0000 (UTC)
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Subject: svn commit: r239587 - head/sys/kern
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Author: jhb
Date: Wed Aug 22 20:02:42 2012
New Revision: 239587
URL: http://svn.freebsd.org/changeset/base/239587

Log:
  Assert that system calls do not leak a pinned thread (via sched_pin()) to
  userland.

Modified:
  head/sys/kern/subr_syscall.c

Modified: head/sys/kern/subr_syscall.c
==============================================================================
--- head/sys/kern/subr_syscall.c	Wed Aug 22 20:01:57 2012	(r239586)
+++ head/sys/kern/subr_syscall.c	Wed Aug 22 20:02:42 2012	(r239587)
@@ -188,6 +188,9 @@ syscallret(struct thread *td, int error,
 	KASSERT((td->td_pflags & TDP_NOSLEEPING) == 0,
 	    ("System call %s returning with sleep disabled",
 	     syscallname(p, sa->code)));
+	KASSERT(td->td_pinned == 0,
+	    ("System call %s returning with pinned thread",
+	     syscallname(p, sa->code)));
 
 	/*
 	 * Handle reschedule and other end-of-syscall issues