Re: Race condition/bug in cloud-init/dhcp?

[Justin Cinkelj]

A, and there is at least on case, where wrong transaction ID is normal:
[I/42 dhcp]: Waiting for IP...
[I/42 dhcp]: Waiting for IP...
[W/245 dhcp]: Got packet with wrong transaction ID (1658613712, 83593658)

OSv sends first discover. DHCP server takes some time, to check if lease is 
actually free, then it sends offer.
In between, OSv send out the second discover, before getting response to 
the first one, so when getting it, "wrong transaction ID" is reported.

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Re: Race condition/bug in cloud-init/dhcp?

[Justin Cinkelj]

The idea of releasing IP during boot was really bad - any code doing TCP/IP 
during that time could be affected. I saw problem with nfs-mount.so, for 
example.

Sorry for the inconvenience. 
Justin

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Re: Race condition/bug in cloud-init/dhcp?

[Rick Payne]

> On 7 Jan 2017, at 08:03, Rick Payne  wrote:

> I wondered if it was something to do with getting the hostname via 
> cloud-init, and re-doing the DHCP? I can’t say I’ve tried this before that 
> recent change went in - if I get a chance later I will do…

So looks like I didn’t have Justin’s changes in this build - and now I have, I 
no longer see the issue. So this can probably be ignored - unless I start 
seeing it again :)

Rick

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Race condition/bug in cloud-init/dhcp?

[Rick Payne]

I’ve started playing with cloud-init, and I’m occasionally seeing things halt 
during startup. Not very frequently, but frequently enough that it looks like 
some race condition. The indicator is the DHCP message ‘Got packet with wrong 
transaction ID’. Anyone else seen this?

BSD shrinker: unlocked, running
[I/32 dhcp]: Waiting for IP...
[I/32 dhcp]: Waiting for IP...
[W/212 dhcp]: Got packet with wrong transaction ID (800221411, 1181823109)
[I/212 dhcp]: DHCP received hostname: osv

[I/212 dhcp]: Server acknowledged IP for interface eth0
eth0: 172.16.12.220
[I/212 dhcp]: Configuring eth0: ip 172.16.12.220 subnet mask 255.255.255.0 
gateway 172.16.12.2 MTU 1500
Running from /init/00-cmdline: /usr/mgmt/cloud-init.so --force-probe;

Running from /init/30-auto-00: /libhttpserver.so &!
could not load libicui18n.so.55
could not load libicuuc.so.55
Probing EC2 ...
Looks like we're on EC2

I get nothing else from OSv. At the same time, on the ec2-simulator I get this 
logged:

Serving metadata at local port 80
172.16.12.220 - - [07/Jan/2017 07:58:36] "GET /latest/meta-data/ami-id 
HTTP/1.0" 200 -
172.16.12.220 - - [07/Jan/2017 07:58:36] "GET /latest/meta-data/public-hostname 
HTTP/1.0" 200 -

I wondered if it was something to do with getting the hostname via cloud-init, 
and re-doing the DHCP? I can’t say I’ve tried this before that recent change 
went in - if I get a chance later I will do…

Cheers,
Rick

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