[Bug 1538049] Re: xenstore crashes with SIGBUS in domain_can_read()

[Stefan Bader]

Hint from upstream. Sounds plausible that this might be the upstream
fix:

9c17d96500f78 "xen/gntdev: Grant maps should not be subject to NUMA
balancing"

I guess 4.3 started to be more aggressive there since I never saw this
before 4.3 and there even on a non-NUMA system. But having a grant-table
mapping taken away from the dom0 kernel without xenstored being involved
would explain it tripping over that now bad pointer.

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https://bugs.launchpad.net/bugs/1538049

Title:
  xenstore crashes with SIGBUS in domain_can_read()

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