bionic:

ubuntu@lp1772456-b:~$ dpkg -l | grep ebtables
ii  ebtables                        2.0.10.4-3.5ubuntu2                amd64    
    Ethernet bridge frame table administration

ubuntu@lp1772456-b:~$ sudo ./repro.sh foo & sudo ./repro.sh bar &
[1] 2807
[2] 2808
ubuntu@lp1772456-b:~$ Unable to create lock file /run/ebtables.lock.
odd!
Unable to create lock file /run/ebtables.lock.
odd!
Unable to create lock file /run/ebtables.lock.
odd!
Unable to create lock file /run/ebtables.lock.
odd!
Unable to create lock file /run/ebtables.lock.
odd!
Unable to create lock file /run/ebtables.lock.


ubuntu@lp1772456-b:~$ dpkg -l | grep ebtables
ii  ebtables                        2.0.10.4-3.5ubuntu2.18.04.1        amd64    
    Ethernet bridge frame table administration

ubuntu@lp1772456-b:~$ sudo ./repro.sh foo & sudo ./repro.sh bar &
[1] 17609
[2] 17610
ubuntu@lp1772456-b:~$ Trying to obtain lock /run/ebtables.lock
Trying to obtain lock /run/ebtables.lock
Trying to obtain lock /run/ebtables.lock
Trying to obtain lock /run/ebtables.lock
Trying to obtain lock /run/ebtables.lock


verified fixed in bionic.

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https://bugs.launchpad.net/bugs/1772456

Title:
  ebtables lock file fcntl errno value not correctly checked

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