[SSI] openssi/kernel/mm oom_kill.c,1.5,1.6

Update of /cvsroot/ssic-linux/openssi/kernel/mm
In directory sfp-cvsdas-3.v30.ch3.sourceforge.com:/tmp/cvs-serv23888/mm

Modified Files:
      Tag: OPENSSI-FC
	oom_kill.c 
Log Message:
VPROC:
- Fix select_bad_process() NULL p_vproc pointer dereference.
- Fix de_thread() related issues:
  - Fix de_thread() calling VPOP_RECLAIM_CHILD() while holding spin_lock(task->p
roc_lock). Code path might sleep.
  - Fix NULL p_vproc pointer dereference when thread group leader is exiting, ha
s PF_FORKNOEXEC flag, and has lost race with de_thread(). Affects exit_notify(),
 forget_original_parent(), and will_become_orphaned_pgrp(). When p_vproc is NULL
 the exiting process reaps itself.
  - Fix dpvproc_nocldwait_async_handler() NULL pointer dereference due to failed
 lookup for vproc of new parent when lost race with de_thread(). (#ifdef RELEASE
_TASK_LEADER_GONE__VPROC_FIX)
  - New PVPOP_SWITCH_PID() to switch VProc PID of process doing de_thread().
  - New PV_DETHREAD_REAP flag is set during de_thread() to indicate to child rea
per to reap thread group leader without delay.
  - Fix oops in do_notify_resume() path due to NULL pointer dereference. p_vproc
 is NULL after bad fork.

VPROC (#ifdef VPROC_RELEASE__REFCNT_RACE_FIX):
- Fix extra VPROC_RELE() on PVPOP_RMV_PGRP_LIST() -ESRCH error.
- Fix PVPOP_REAP() extra dpvproc_remove_pgrp_leader_member_care() on PVPOP_RMV_P
GRP_LIST() -EBUSY error; was typo in if-test.
- PVPOP_REAP() no longer does async PVPOP_RMV_PGRP_LIST(); now sync. Don't see h
ow reaping parent can hold PGRP LOCK in PVPOP_REAP() path.
- Fix exit_vproc() did not decrement vproc reference for process group leader on
 member node. This is in do_fork() error path.

VPROC (#ifdef VPROC_CONTINUE):
- Fix dpvproc_nocldwait_async_handler() deadlock on PVPOP_REAP() -EBUSY due to d
elay_group_leader(). PV_REAPER_RETRY flag is set and group leader is re-inserted
 into the queue so that the remaining threads in thread group can be reaped by t
his handler to remove the delay_group_leader() condition.
- Regression:
  - Fix pproc_reap() should succeed, but returns -EBUSY when process is a thread
 group leader in non-empty thread group and is already in EXIT_DEAD state.


Index: oom_kill.c
===================================================================
RCS file: /cvsroot/ssic-linux/openssi/kernel/mm/oom_kill.c,v
retrieving revision 1.5
retrieving revision 1.6
diff -u -d -r1.5 -r1.6
--- oom_kill.c	27 Oct 2009 03:18:30 -0000	1.5
+++ oom_kill.c	17 Dec 2009 05:46:51 -0000	1.6
@@ -153,7 +153,8 @@
 	do_each_thread(g, p)
 #ifdef CONFIG_VPROC
 		/* skip init, child_reaper, system processes */
-		if (p->pid > 2 && !IS_SYSPROC(PVP(p->p_vproc))) {
+		if (p->pid > 2 &&
+		    (!p->p_vproc || !IS_SYSPROC(PVP(p->p_vproc)))) {
 #else
 		/* skip the init task with pid == 1 */
 		if (p->pid > 1) {


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