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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Wed, 6 Jun 2012 01:01:12 +0000 (UTC)
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Subject: svn commit: r236648 - stable/9/sys/kern
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Author: kib
Date: Wed Jun  6 01:01:12 2012
New Revision: 236648
URL: http://svn.freebsd.org/changeset/base/236648

Log:
  MFC r236309:
  Assert that TDP_NOFAULTING and TDP_NOSPEEPING thread flags do not leak
  when thread returns from a syscall to usermode.

Modified:
  stable/9/sys/kern/subr_syscall.c
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/kern/subr_syscall.c
==============================================================================
--- stable/9/sys/kern/subr_syscall.c	Wed Jun  6 00:20:13 2012	(r236647)
+++ stable/9/sys/kern/subr_syscall.c	Wed Jun  6 01:01:12 2012	(r236648)
@@ -182,6 +182,12 @@ syscallret(struct thread *td, int error,
 	KASSERT(td->td_locks == 0,
 	    ("System call %s returning with %d locks held",
 	     syscallname(p, sa->code), td->td_locks));
+	KASSERT((td->td_pflags & TDP_NOFAULTING) == 0,
+	    ("System call %s returning with pagefaults disabled",
+	     syscallname(p, sa->code)));
+	KASSERT((td->td_pflags & TDP_NOSLEEPING) == 0,
+	    ("System call %s returning with sleep disabled",
+	     syscallname(p, sa->code)));
 
 	/*
 	 * Handle reschedule and other end-of-syscall issues