Author: kib
Date: Mon Oct  3 16:58:58 2011
New Revision: 225942
URL: http://svn.freebsd.org/changeset/base/225942

Log:
  Assert that exiting process does not return to usermode.
  
  Reviewed by:  avg, jhb
  MFC after:    1 week

Modified:
  head/sys/kern/subr_trap.c

Modified: head/sys/kern/subr_trap.c
==============================================================================
--- head/sys/kern/subr_trap.c   Mon Oct  3 16:30:18 2011        (r225941)
+++ head/sys/kern/subr_trap.c   Mon Oct  3 16:58:58 2011        (r225942)
@@ -99,6 +99,8 @@ userret(struct thread *td, struct trapfr
 
        CTR3(KTR_SYSC, "userret: thread %p (pid %d, %s)", td, p->p_pid,
             td->td_name);
+       KASSERT((p->p_flag & P_WEXIT) == 0,
+           ("Exiting process returns to usermode"));
 #if 0
 #ifdef DIAGNOSTIC
        /* Check that we called signotify() enough. */
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