Bug #4697: Fatal bind error when initializing multicast UDP faces - NFD - NDN project issue tracking system

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Bug #4697

closed

Fatal bind error when initializing multicast UDP faces

Added by Alexander Lane over 6 years ago. Updated about 6 years ago.

Status:

Rejected

Priority:

Normal

Assignee:

Davide Pesavento

Category:

Faces

Target version:

Start date:

Due date:

% Done:

Estimated time:

Description

In a Mini-NDN-Wifi environment, we have repeatedly received fatal errors from bind when creating UDP multicast faces, as well as noticing a UDP multicast face being initalized twice. This likely occurs from changing IP addresses in the program's setup, but the error message does not provide much detail. It's also noteworthy that the UDP multi-cast factory seems to be invoked twice for the same interface. An example log is attached below.

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log_file_with_debug.txt (17.1 KB) log_file_with_debug.txt		Alexander Lane, 08/07/2018 12:31 PM
notes.txt (368 Bytes) notes.txt		Alexander Lane, 08/09/2018 01:56 PM
topo.conf (155 Bytes) topo.conf		Alexander Lane, 08/09/2018 01:56 PM
exampleexp.py (1017 Bytes) exampleexp.py		Alexander Lane, 08/09/2018 01:56 PM

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Updated by Davide Pesavento over 6 years ago

Subject changed from Fatal error when initializing multicast faces to Fatal bind error when initializing multicast faces
Category changed from Core to Faces
Start date deleted (~~08/07/2018~~)

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Updated by Davide Pesavento over 6 years ago

Assignee set to Davide Pesavento

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Updated by Alexander Lane over 6 years ago

File notes.txt notes.txt added
File topo.conf topo.conf added
File exampleexp.py exampleexp.py added

Adding code to replicate and version information if it's needed.

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Updated by Davide Pesavento over 6 years ago

Status changed from New to In Progress

I'm trying to debug this with Alexander.
The bind that fails is on sta2-wlan0 with address fe80::ff:fe00:100%sta2-wlan0 (link scope). sta2-wlan0 is an emulated wireless interface using 80211_hwsim.

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Updated by Davide Pesavento over 6 years ago

Subject changed from Fatal bind error when initializing multicast faces to Fatal bind error when initializing multicast UDP faces

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Updated by Davide Pesavento over 6 years ago

I could not reproduce the problem on Ubuntu 18.04 using either veth or mac80211_hwsim interfaces. The multicast faces are always created successfully.

Can you test outside mini-ndn (possibly with a simplified setup, e.g. only one pair of mac80211_hwsim interfaces) and see if you still experience the crash?

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Updated by Alexander Lane over 6 years ago

Davide Pesavento wrote:

I could not reproduce the problem on Ubuntu 18.04 using either veth or mac80211_hwsim interfaces. The multicast faces are always created successfully.

Can you test outside mini-ndn (possibly with a simplified setup, e.g. only one pair of mac80211_hwsim interfaces) and see if you still experience the crash?

We are running on 16.04, but I will check on 18.04.

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