mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-20 14:13:16 +00:00
708a507af0
Refresh kernel patches for generic kernel 5.15 due to new backport version of MGLRU patchset. Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
57 lines
1.7 KiB
Diff
57 lines
1.7 KiB
Diff
From c7dfefd4bdfba3d5171038d1cc2d4160288e6ee4 Mon Sep 17 00:00:00 2001
|
|
From: Yu Zhao <yuzhao@google.com>
|
|
Date: Sun, 15 Jan 2023 20:44:05 -0700
|
|
Subject: [PATCH 16/29] mm: multi-gen LRU: fix crash during cgroup migration
|
|
|
|
lru_gen_migrate_mm() assumes lru_gen_add_mm() runs prior to itself. This
|
|
isn't true for the following scenario:
|
|
|
|
CPU 1 CPU 2
|
|
|
|
clone()
|
|
cgroup_can_fork()
|
|
cgroup_procs_write()
|
|
cgroup_post_fork()
|
|
task_lock()
|
|
lru_gen_migrate_mm()
|
|
task_unlock()
|
|
task_lock()
|
|
lru_gen_add_mm()
|
|
task_unlock()
|
|
|
|
And when the above happens, kernel crashes because of linked list
|
|
corruption (mm_struct->lru_gen.list).
|
|
|
|
Link: https://lore.kernel.org/r/20230115134651.30028-1-msizanoen@qtmlabs.xyz/
|
|
Link: https://lkml.kernel.org/r/20230116034405.2960276-1-yuzhao@google.com
|
|
Fixes: bd74fdaea146 ("mm: multi-gen LRU: support page table walks")
|
|
Signed-off-by: Yu Zhao <yuzhao@google.com>
|
|
Reported-by: msizanoen <msizanoen@qtmlabs.xyz>
|
|
Tested-by: msizanoen <msizanoen@qtmlabs.xyz>
|
|
Cc: <stable@vger.kernel.org> [6.1+]
|
|
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
---
|
|
mm/vmscan.c | 5 ++++-
|
|
1 file changed, 4 insertions(+), 1 deletion(-)
|
|
|
|
--- a/mm/vmscan.c
|
|
+++ b/mm/vmscan.c
|
|
@@ -3024,13 +3024,16 @@ void lru_gen_migrate_mm(struct mm_struct
|
|
if (mem_cgroup_disabled())
|
|
return;
|
|
|
|
+ /* migration can happen before addition */
|
|
+ if (!mm->lru_gen.memcg)
|
|
+ return;
|
|
+
|
|
rcu_read_lock();
|
|
memcg = mem_cgroup_from_task(task);
|
|
rcu_read_unlock();
|
|
if (memcg == mm->lru_gen.memcg)
|
|
return;
|
|
|
|
- VM_WARN_ON_ONCE(!mm->lru_gen.memcg);
|
|
VM_WARN_ON_ONCE(list_empty(&mm->lru_gen.list));
|
|
|
|
lru_gen_del_mm(mm);
|