Re: WARNING in try_charge
From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Date: 2018-08-05 11:33:20
Also in:
linux-mm, lkml
On 2018/08/04 22:45, Tetsuo Handa wrote:
syzbot is hitting WARN(1) because of mem_cgroup_out_of_memory() == false.
Since syzbot found a syz reproducer, I asked syzbot to try two patches. Setting MMF_OOM_SKIP under oom_lock to prevent from races ( https://syzkaller.appspot.com/x/patch.diff?x=10fb3fd0400000 ) was not sufficient. Waiting until __mmput() completes (with timeout using OOM score feedback) ( https://syzkaller.appspot.com/x/patch.diff?x=101e449c400000 ) solved this race.