The patch titled Subject: fork, memcg: fix cached_stacks case has been added to the -mm tree. Its filename is fork-memcg-fix-cached_stacks-case.patch

This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/fork-memcg-fix-cached_stacks-case.p... and later at http://ozlabs.org/~akpm/mmotm/broken-out/fork-memcg-fix-cached_stacks-case.p...

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------------------------------------------------------ From: Shakeel Butt shakeelb@google.com Subject: fork, memcg: fix cached_stacks case

5eed6f1dff87 ("fork,memcg: fix crash in free_thread_stack on memcg charge fail") fixes a crash caused due to failed memcg charge of the kernel stack. However the fix misses the cached_stacks case which this patch fixes. So, the same crash can happen if the memcg charge of a cached stack is failed.

Link: http://lkml.kernel.org/r/20190102180145.57406-1-shakeelb@google.com Fixes: 5eed6f1dff87 ("fork,memcg: fix crash in free_thread_stack on memcg charge fail") Signed-off-by: Shakeel Butt shakeelb@google.com Cc: Rik van Riel riel@surriel.com Cc: Roman Gushchin guro@fb.com Cc: Michal Hocko mhocko@suse.com Cc: Johannes Weiner hannes@cmpxchg.org Cc: Tejun Heo tj@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

kernel/fork.c | 1 + 1 file changed, 1 insertion(+)

--- a/kernel/fork.c~fork-memcg-fix-cached_stacks-case +++ a/kernel/fork.c @@ -221,6 +221,7 @@ static unsigned long *alloc_thread_stack memset(s->addr, 0, THREAD_SIZE);

tsk->stack_vm_area = s; + tsk->stack = s->addr; return s->addr; }

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Patches currently in -mm which might be from shakeelb@google.com are

fork-memcg-fix-cached_stacks-case.patch