Re: Linux 4.9.55 break network setup because dhcp client gets an error

Re: Linux 4.9.55 break network setup because dhcp client gets an error

[Shuah Khan]

On Thu, Oct 12, 2017 at 11:52 AM, Eric Valette <eric.valette@free.fr> wrote:
> Hi,
>
> Just compiled a fresh 4.9.55, with same .config, same user space than 4.9.54
> and discovered I had no network because ifup fails because dhcp cleint
> fails. As everything is identical, 4.9.54 still works, I guess one patch in
> net/core/... did break something.
>
> ifup eth0
> Internet Systems Consortium DHCP Client 4.3.5
> Copyright 2004-2016 Internet Systems Consortium.
> All rights reserved.
> For info, please visit https://www.isc.org/software/dhcp/
>
> Can't install packet filter program: Cannot allocate memory
>  <=====
> If you think you have received this message due to a bug rather
> than a configuration issue please read the section on submitting
> bugs on either our web page at www.isc.org or in the README file
> before submitting a bug.  These pages explain the proper
> process and the information we find helpful for debugging..
>
> exiting.
> ifup: failed to bring up eth0
>
> Ps: CC me I'm not subscribed
>

Please revert commit 345c66695569db83eed100723e4df72cb54df7de

Author: Eric Dumazet <edumazet@google.com>
Date:   Mon Oct 2 12:20:51 2017 -0700

    socket, bpf: fix possible use after free

This will fix the problem.

thanks,
-- Shuah

Re: Linux 4.9.55 break network setup because dhcp client gets an error

[Eric Valette]

On 12/10/2017 19:57, Shuah Khan wrote:
> On Thu, Oct 12, 2017 at 11:52 AM, Eric Valette <eric.valette@free.fr> wrote:
>> Hi,
>>
>> Just compiled a fresh 4.9.55, with same .config, same user space than 4.9.54
>> and discovered I had no network because ifup fails because dhcp cleint
>> fails. As everything is identical, 4.9.54 still works, I guess one patch in
>> net/core/... did break something.
>>

> Please revert commit 345c66695569db83eed100723e4df72cb54df7de
> 
> Author: Eric Dumazet <edumazet@google.com>
> Date:   Mon Oct 2 12:20:51 2017 -0700
> 
>      socket, bpf: fix possible use after free
> 
> This will fix the problem.

Thanks for the quick answer. Glad to see it is already known and almost 
fixed. I'll rather wait for 56 (to get the correct patch dependency 
merged) and remove 55 kernel image from /boot in the meantime.

Glas my headless NAS has a fixed address because it is more tricky to 
get back in order and I switched it to 55 already.

Thanks for the support,

-- eric

Re: Linux 4.9.55 break network setup because dhcp client gets an error

[Cong Wang]

(Cc'ing netdev and the author Eric)

On Thu, Oct 12, 2017 at 10:57 AM, Shuah Khan <shuahkhan@gmail.com> wrote:
> On Thu, Oct 12, 2017 at 11:52 AM, Eric Valette <eric.valette@free.fr> wrote:
>> Hi,
>>
>> Just compiled a fresh 4.9.55, with same .config, same user space than 4.9.54
>> and discovered I had no network because ifup fails because dhcp cleint
>> fails. As everything is identical, 4.9.54 still works, I guess one patch in
>> net/core/... did break something.
>>
>> ifup eth0
>> Internet Systems Consortium DHCP Client 4.3.5
>> Copyright 2004-2016 Internet Systems Consortium.
>> All rights reserved.
>> For info, please visit https://www.isc.org/software/dhcp/
>>
>> Can't install packet filter program: Cannot allocate memory
>>  <=====
>> If you think you have received this message due to a bug rather
>> than a configuration issue please read the section on submitting
>> bugs on either our web page at www.isc.org or in the README file
>> before submitting a bug.  These pages explain the proper
>> process and the information we find helpful for debugging..
>>
>> exiting.
>> ifup: failed to bring up eth0
>>
>> Ps: CC me I'm not subscribed
>>
>
> Please revert commit 345c66695569db83eed100723e4df72cb54df7de
>
> Author: Eric Dumazet <edumazet@google.com>
> Date:   Mon Oct 2 12:20:51 2017 -0700
>
>     socket, bpf: fix possible use after free
>
> This will fix the problem.
>
> thanks,
> -- Shuah

Re: Linux 4.9.55 break network setup because dhcp client gets an error

[Greg KH]

On Thu, Oct 12, 2017 at 12:56:57PM -0700, Cong Wang wrote:
> (Cc'ing netdev and the author Eric)

Already fixed, try 4.9.56 :)

thanks,

greg k-h