[PATCH] oom: debug skipping killing

[Michal Hocko]

---
 mm/oom_kill.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 069b64e..3d759f0 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -329,6 +329,8 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
 		if (test_tsk_thread_flag(p, TIF_MEMDIE)) {
 			if (unlikely(frozen(p)))
 				thaw_process(p);
+			printk(KERN_WARNING"XXX: pid:%d (flags:%u) is TIF_MEMDIE. Waiting for it\n",
+					p->pid, p->flags);
 			return ERR_PTR(-1UL);
 		}
 		if (!p->mm)
@@ -353,8 +355,11 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
 				 * then wait for it to finish before killing
 				 * some other task unnecessarily.
 				 */
-				if (!(p->group_leader->ptrace & PT_TRACE_EXIT))
+				if (!(p->group_leader->ptrace & PT_TRACE_EXIT)) {
+					printk(KERN_WARNING"XXX: pid:%d (flags:%u) is PF_EXITING. Waiting for it\n",
+							p->pid, p->flags);
 					return ERR_PTR(-1UL);
+				}
 			}
 		}
 
@@ -494,6 +499,7 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
 	 * its children or threads, just set TIF_MEMDIE so it can die quickly
 	 */
 	if (p->flags & PF_EXITING) {
+		printk(KERN_WARNING"XXX: pid:%d (flags:%u). Not killing PF_EXITING\n", p->pid, p->flags);
 		set_tsk_thread_flag(p, TIF_MEMDIE);
 		return 0;
 	}
@@ -567,6 +573,8 @@ void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask)
 	 * its memory.
 	 */
 	if (fatal_signal_pending(current)) {
+		printk(KERN_WARNING"XXX: pid:%d (flags:%u) has fatal_signal_pending. Waiting for it\n",
+				p->pid, p->flags);
 		set_thread_flag(TIF_MEMDIE);
 		return;
 	}
-- 
1.7.10.4

-- 
Michal Hocko
SUSE Labs
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