linux-kernel - Re: [PATCH v3 bpf] bpf: introduce BPF_JIT_ALWAYS

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Date:   Mon, 29 Jan 2018 21:25:36 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Alexei Starovoitov <ast@...nel.org>, davem@...emloft.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH v3 bpf] bpf: introduce BPF_JIT_ALWAYS_ON config

On 01/29/2018 06:36 PM, Greg KH wrote:
> On Mon, Jan 29, 2018 at 04:36:35PM +0100, Daniel Borkmann wrote:
>> On 01/29/2018 12:40 AM, Daniel Borkmann wrote:
>>> On 01/28/2018 03:45 PM, Greg KH wrote:
>>>> On Wed, Jan 24, 2018 at 11:10:50AM +0100, Daniel Borkmann wrote:
>>>>> On 01/24/2018 11:07 AM, David Woodhouse wrote:
>>>>>> On Tue, 2018-01-09 at 22:39 +0100, Daniel Borkmann wrote:
>>>>>>> On 01/09/2018 07:04 PM, Alexei Starovoitov wrote:
>> [...]
>>>>>>> Applied to bpf tree, thanks Alexei!
>>>>>>
>>>>>> For stable too?
>>>>>
>>>>> Yes, this will go into stable as well; batch of backports will come Thurs/Fri.
>>>>
>>>> Any word on these?  Worse case, a simple list of git commit ids to
>>>> backport is all I need.
>>>
>>> Sorry for the delay! There are various conflicts all over the place, so I had
>>> to backport manually. I just flushed out tested 4.14 batch, I'll see to get 4.9
>>> out hopefully tonight as well, and the rest for 4.4 on Mon.
>>
>> While 4.14 and 4.9 BPF backports are tested and out since yesterday, and I
>> saw Greg queued them up (thanks!), it looks like plain 4.4.113 doesn't even
>> boot on my machine. While I can shortly see the kernel log, my screen turns
>> black shortly thereafter and nothing reacts anymore. No such problems with
>> 4.9 and 4.14 stables seen. (using x86_64, i7-6600U) Is this a known issue?
> 
> Not that I know of, sorry.  Odd graphics issue perhaps?
> 
> If you have some test programs I can run, I can look into doing the
> backports, I still have a laptop around here that runs 4.4 :)
> 
> There's always a virtual machine as well, have you tried that?

I've switched to an arm64 node now, that's working fine with 4.4, so patches
will come later tonight.

Thanks,
Daniel