From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Alexander Duyck <alexander.duyck@gmail.com>
Cc: nbd@nbd.name, davem@davemloft.net, edumazet@google.com,
hawk@kernel.org, ilias.apalodimas@linaro.org, kuba@kernel.org,
linux-kernel@vger.kernel.org, linyunsheng@huawei.com,
lorenzo@kernel.org, netdev@vger.kernel.org, pabeni@redhat.com
Subject: Re: [net PATCH] skb: Do mix page pool and page referenced frags in GRO
Date: Thu, 26 Jan 2023 22:35:27 +0100 [thread overview]
Message-ID: <87o7qlkmhs.fsf@toke.dk> (raw)
In-Reply-To: <CAKgT0UfsLFuCK0vQF70s=8XC8qwrzxag_NR2dCDvxqx84E0K=g@mail.gmail.com>
Alexander Duyck <alexander.duyck@gmail.com> writes:
> On Thu, Jan 26, 2023 at 11:14 AM Toke Høiland-Jørgensen <toke@redhat.com> wrote:
>>
>> Alexander Duyck <alexander.duyck@gmail.com> writes:
>>
>> > From: Alexander Duyck <alexanderduyck@fb.com>
>> >
>> > GSO should not merge page pool recycled frames with standard reference
>> > counted frames. Traditionally this didn't occur, at least not often.
>> > However as we start looking at adding support for wireless adapters there
>> > becomes the potential to mix the two due to A-MSDU repartitioning frames in
>> > the receive path. There are possibly other places where this may have
>> > occurred however I suspect they must be few and far between as we have not
>> > seen this issue until now.
>> >
>> > Fixes: 53e0961da1c7 ("page_pool: add frag page recycling support in page pool")
>> > Reported-by: Felix Fietkau <nbd@nbd.name>
>> > Signed-off-by: Alexander Duyck <alexanderduyck@fb.com>
>>
>> I know I'm pattern matching a bit crudely here, but we recently had
>> another report where doing a get_page() on skb->head didn't seem to be
>> enough; any chance they might be related?
>>
>> See: https://lore.kernel.org/r/Y9BfknDG0LXmruDu@JNXK7M3
>
> Looking at it I wouldn't think so. Doing get_page() on these frames is
> fine. In the case you reference it looks like get_page() is being
> called on a slab allocated skb head. So somehow a slab allocated head
> is leaking through.
Alright, thanks for taking a look! :)
-Toke
next prev parent reply other threads:[~2023-01-26 21:36 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-24 12:43 [PATCH] net: page_pool: fix refcounting issues with fragmented allocation Felix Fietkau
2023-01-24 14:11 ` Ilias Apalodimas
2023-01-24 15:57 ` Alexander H Duyck
2023-01-24 16:59 ` Felix Fietkau
2023-01-26 10:31 ` Ilias Apalodimas
2023-01-26 15:41 ` Alexander Duyck
2023-01-26 16:05 ` Ilias Apalodimas
2023-01-24 17:22 ` Felix Fietkau
2023-01-24 21:10 ` Alexander H Duyck
2023-01-24 21:30 ` Felix Fietkau
2023-01-25 17:11 ` Alexander H Duyck
2023-01-25 17:32 ` Felix Fietkau
2023-01-25 18:26 ` Alexander H Duyck
2023-01-25 18:42 ` Felix Fietkau
2023-01-25 19:02 ` Alexander H Duyck
2023-01-25 19:10 ` Felix Fietkau
2023-01-25 19:40 ` Felix Fietkau
2023-01-25 20:02 ` Felix Fietkau
2023-01-25 22:14 ` Alexander H Duyck
2023-01-26 6:12 ` Felix Fietkau
2023-01-26 9:14 ` Felix Fietkau
2023-01-26 16:08 ` Alexander Duyck
2023-01-26 16:40 ` Alexander Duyck
2023-01-26 17:44 ` Felix Fietkau
2023-01-26 18:38 ` Alexander H Duyck
2023-01-26 18:43 ` Felix Fietkau
2023-01-26 19:06 ` [net PATCH] skb: Do mix page pool and page referenced frags in GRO Alexander Duyck
2023-01-26 19:14 ` Toke Høiland-Jørgensen
2023-01-26 19:48 ` Alexander Duyck
2023-01-26 21:35 ` Toke Høiland-Jørgensen [this message]
2023-01-26 23:13 ` Jakub Kicinski
2023-01-27 7:15 ` Ilias Apalodimas
2023-01-27 7:21 ` Felix Fietkau
2023-01-30 16:49 ` Jesper Dangaard Brouer
2023-01-28 2:37 ` Yunsheng Lin
2023-01-28 5:26 ` Jakub Kicinski
2023-01-28 7:08 ` Eric Dumazet
2023-01-30 8:50 ` Paolo Abeni
2023-01-30 16:17 ` Alexander Duyck
2023-01-28 7:15 ` Eric Dumazet
2023-01-28 17:08 ` Alexander Duyck
2023-01-28 7:50 ` patchwork-bot+netdevbpf
2023-01-26 10:32 ` [PATCH] net: page_pool: fix refcounting issues with fragmented allocation Ilias Apalodimas
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