On 2022/9/10 14:34, Greg KH wrote:
On Fri, Sep 09, 2022 at 11:40:07AM +0800, Ye Weihua wrote:The following patch is required to be patched in linux-5.10.y: 3f913fc5f974 mm: fix missing handler for __GFP_NOWARN Commit 6b9dbedbe349 ("tty: fix deadlock caused by calling printk() under tty_port->lock") was backported to linux-5.10.y. But __GFP_NOWARN flag is still not check in fail_dump(), and deadlock issues still occur.What about all of the other stable kernel trees that the tty patch was backported to? Do they also need the mm change as well? That would include 4.9.y, 4.14.y, 4.19.y, 5.4.y, 5.10.y, and 5.15.y.
I checked the branches and found that the status of each branch was the same. That is, the commit 6b9dbedbe349 ("tty: fix deadlock caused by calling printk() under tty_port->lock") was backported but the commit 3f913fc5f974 ("mm: fix missing handler for __GFP_NOWARN") was not. Therefore, the problem occurred in all branches. The commit "mm: fix missing handler for __GFP_NOWARN" should be backported to 4.9.y, 4.14.y, 4.19.y, 5.4.y, 5.10.y, and 5.15.y.
