[Bug 1472650] Re: [arm64] gccgo runtime crashes with CONFIG_ARM64_PGTABLE_LEVELS=4

[dann frazier]

Marking as impacting juju-core/trusty. This is easily reproduced by
attempting to bootstrap a juju-local environment in trusty with juju-
core 1.24.7-0ubuntu1~14.04.1 when using a kernel w/ 4 level page tables.
This will be a supported config once the xenial-lts kernel is available
in trusty.

A no-change rebuild of juju-core trusty would be sufficient to resolve
this issue.


ubuntu at cvm2s2:~$ juju bootstrap --verbose
Bootstrapping environment "local"
Starting new instance for initial state server
Building tools to upload (1.24.7.1-trusty-arm64)
Bootstrap failed, destroying environment
ERROR failed to bootstrap environment: cannot upload bootstrap tools: cannot get version from "/tmp/juju-tools525417221/jujud": exit status 2; p=0xffff9354f000
fatal error: runtime_lfstackpush: invalid pointer

runtime stack:

        :0

        :0

        :0

        :0

        :0

        :0

        :0

        :0

        :0

        :0

goroutine 1 [garbage collection]:
github.com_juju_cmd.DefaultContext
	/build/juju-core-qiO5uV/juju-core-1.24.7/src/github.com/juju/cmd/cmd.go:261
main.Main
	/build/juju-core-qiO5uV/juju-core-1.24.7/src/github.com/juju/juju/cmd/jujud/main.go:166
main.MainWrapper
	/build/juju-core-qiO5uV/juju-core-1.24.7/src/github.com/juju/juju/cmd/jujud/main.go:151
main.main
	/build/juju-core-qiO5uV/juju-core-1.24.7/src/github.com/juju/juju/cmd/jujud/main_nix.go:13

goroutine 3 [syscall]:
	goroutine in C code; stack unavailable


** Also affects: juju-core (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: juju-core (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1472650

Title:
  [arm64] gccgo runtime crashes with CONFIG_ARM64_PGTABLE_LEVELS=4

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