My kernel version is 3.10 ,but the 4.3 is the same
and the newest code is
for_each_process(p) {
if (!process_shares_mm(p, mm))
continue;
if (same_thread_group(p, victim))
continue;
if (unlikely(p->flags & PF_KTHREAD))
continue;
if (p->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
continue;
so this not add the ！is_global_init also.
when we vfork (CLONE_VM) a process,the copy_mm
if (clone_flags & CLONE_VM) {
atomic_inc(&oldmm->mm_users);
mm = oldmm;
goto good_mm;
}
use the parent mm.
On 2015/11/30 11:08, Andrew Morton wrote:
On Mon, 30 Nov 2015 18:54:29 +0800 <chenjie6@xxxxxxxxxx> wrote:
From: chenjie <chenjie6@xxxxxxxxxx>
when oom happened we can see:
Out of memory: Kill process 9134 (init) score 3 or sacrifice child
Killed process 9134 (init) total-vm:1868kB, anon-rss:84kB, file-rss:572kB
Kill process 1 (init) sharing same memory
...
Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009
That's because:
the busybox init will vfork a process,oom_kill_process found
the init not the children,their mm is the same when vfork.
...
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -513,7 +513,7 @@ void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
rcu_read_lock();
for_each_process(p)
if (p->mm == mm && !same_thread_group(p, victim) &&
- !(p->flags & PF_KTHREAD)) {
+ !(p->flags & PF_KTHREAD) && !is_global_init(p)) {
if (p->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
continue;
What kernel version are you using?
I don't think this can happen in current code...
.
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