I tested with kernel 5.4 running under qemu, and don't see this problem.
Any progress bisecting the issue?
I committed the workaround patch:
http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=4890bcdea2cc0d9ecc21a0e39ed388a650a4ce42
Simon.
On 23/04/2020 21:05, Josh H wrote:
> Hi there,
Having looked at the docs for UML, I doubt that this is a UML problem,
it looks like a pure kernel (in this case, the one running under UML)
problem.
As such a regression test on those three kernels would therefore be useful.
Googling for combinations of recvmsg MSG_PEEK regression UDP MSG_TRUNK
Hi there,
I'm not sure of a way of testing it with a real network device, but I'm
happy to attempt to build a older UML kernel and test it from there. As I
said in my original email, the last fully known working build was way back
in kernel 3.2 and a lot has changed since then, so it could very we
Ok, so Josh ran the strace and sent me the results as requested.
The interesting bit us here.
recvmsg(4, {msg_name={sa_family=AF_INET, sin_port=htons(68),
sin_addr=inet_addr("0.0.0.0")}, msg_namelen=16,
msg_iov=[{iov_base="\1\1\6\0\310\261\311+\0\6\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\366\226}H"..
On 16/04/2020 15:40, Josh H wrote:
>
> First, answer a simple question the answer to which I may have missed.
> Is dnsmasq logging the receipt of DHCPDISCOVER messages? Can we see the
> whole log showing that?
>
>
> Based on the config I provided at the initial message, I have the lo
> First, answer a simple question the answer to which I may have missed.
> Is dnsmasq logging the receipt of DHCPDISCOVER messages? Can we see the
> whole log showing that?
Based on the config I provided at the initial message, I have the log file
writing to /var/log/dnsmasq.log. This is the whol
On 15/04/2020 19:27, Josh H wrote:
> It's difficult for me to share the config outright as I'm using a
> modified version of netkit that I've updated to a much newer kernel
> - http://netkit-ng.github.io/. The netkit version that is available on
> that link is the one that worked with dnsmasq ju
On Wed, Apr 15, 2020 at 07:27:02PM +0100, Josh H wrote:
> On Wed, 15 Apr 2020 at 19:17, Geert Stappers wrote:
> > Josh H wrote in another message:
> > (
> > http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2020q2/013988.html
> > )
> >
> > > I'm running a very odd environment in that I'm u
>
>
> Oops. The simple setup doesn't work.
> In case there are two UML VMs that "see each other" through
> the vHub, feel free to share that config with us.
It's difficult for me to share the config outright as I'm using a modified
version of netkit that I've updated to a much newer kernel -
http
On Wed, Apr 15, 2020 at 06:03:13PM +0100, Josh H wrote:
> On Wed, 15 Apr 2020 at 16:56, wrote:
> >
> > what about nftables if you are using a recent version of linux? many seem
> > to be moving to nftables from iptables...
> > https://linuxhandbook.com/iptables-vs-nftables/
>
>
> Running the comma
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