On Wed, Jun 12, 2019 at 09:50:25AM +0800, zhangxiaoxu (A) wrote:
This patch is for stable branch linux-4.4-y.
On 2019/6/12 9:54, ZhangXiaoxu wrote:
The upstram commit 65d8fc777f6d ("futex: Remove requirement for lock_page() in get_futex_key()") use variable 'page' as the page head, when merge it to stable branch, the variable `page_head` is page head.
In the stable branch, the variable `page` not means the page head, when lock the page head, we should lock 'page_head', rather than 'page'.
It maybe lead a hung task problem.
Signed-off-by: ZhangXiaoxu zhangxiaoxu5@huawei.com Cc: stable@vger.kernel.org
kernel/futex.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
I do not understand.
Please read https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html for how to submit a patch to the stable trees properly.
If the commit is not in Linus's tree, then we can not take it, unless something is _very_ broken and it is the only way it can be resolved.
thanks,
greg k-h