From: Tejun Heo <tj@kernel.org>
To: Daniel Borkmann <daniel@iogearbox.net>
Cc: dennisszhou@gmail.com, Dmitry Vyukov <dvyukov@google.com>,
syzbot <syzbot+adb03f3f0bb57ce3acda@syzkaller.appspotmail.com>,
Alexei Starovoitov <ast@kernel.org>,
netdev <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
syzkaller-bugs@googlegroups.com
Subject: Re: lost connection to test machine (4)
Date: Mon, 12 Feb 2018 09:03:25 -0800 [thread overview]
Message-ID: <20180212170325.GW695913@devbig577.frc2.facebook.com> (raw)
In-Reply-To: <00c45ca8-305d-1818-e974-a9903c8494b8@iogearbox.net>
Hello, Daniel.
On Mon, Feb 12, 2018 at 06:00:13PM +0100, Daniel Borkmann wrote:
> [ +Dennis, +Tejun ]
>
> Looks like we're stuck in percpu allocator with key/value size of 4 bytes
> each and large number of entries (max_entries) in the reproducer in above
> link.
>
> Could we have some __GFP_NORETRY semantics and let allocations fail instead
> of triggering OOM killer?
For some part, maybe, but not generally. The virt area allocation
goes down to page table allocation which is hard coded to use
GFP_KERNEL in arch mm code.
Thanks.
--
tejun
next prev parent reply other threads:[~2018-02-12 17:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <001a113f8734783e94056505f8fd@google.com>
2018-02-12 16:03 ` lost connection to test machine (4) Dmitry Vyukov
2018-02-12 17:00 ` Daniel Borkmann
2018-02-12 17:03 ` Tejun Heo [this message]
2018-02-12 20:05 ` Tejun Heo
2018-02-13 13:35 ` Eric Dumazet
2018-02-13 17:34 ` Dennis Zhou
2018-02-13 17:49 ` Eric Dumazet
2018-02-13 18:13 ` Dennis Zhou
2018-02-14 17:15 ` Dennis Zhou
2018-02-14 17:28 ` syzbot
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