arm64 regression: goroutine 4 [running]: unexpected fault address 0x1238

With libc6 2.19-0ubuntu4:

$ juju
Juju -- devops distilled
https://juju.ubuntu.com/

Juju provides easy, intelligent service orchestration on top of environments
such as Amazon EC2, HP Cloud, OpenStack, MaaS, or your own local machine.

Basic commands:
  juju init generate boilerplate configuration for juju environments
  juju bootstrap start up an environment from scratch

  juju deploy deploy a new service
  juju add-relation add a relation between two services
  juju expose expose a service

  juju help bootstrap more help on e.g. bootstrap command
  juju help commands list all commands
  juju help glossary glossary of terms
  juju help topics list all help topics

Provider information:
  juju help azure-provider use on Windows Azure
  juju help ec2-provider use on Amazon EC2
  juju help hpcloud-provider use on HP Cloud
  juju help local-provider use on this computer
  juju help openstack-provider use on OpenStack

With libc6 2.19-0ubuntu5:

$ juju
fatal error: runtime: mcall function returned

runtime stack:

 :0

 :0

 :0

 :0

 :0

 :0

 :0

 :0

 :0

 :0

goroutine 4 [running]:
unexpected fault address 0x1238
panic during panic