[Bug 1268906] Re: cpu soft lockup running kvm

[Stefan Bader]

I wonder whether this could be remotely related to bug #1265841. I don'T have any proof there. Just stumbled over some used_math check (followed by potential init_fpu) right at the beginning of kvm_arch_vcpu_ioctl_run. There was a longer thread on LKML about that ("[PATCH] Make math_state_restore() save and restore the interrupt flag").
Though in this case nothing is restored, and I don't see interrupts being disabled. Also from the stack it seems we are usually later in that function. So this more loud thinking and putting down notes, so I do not forget....

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Stefan Bader (smb)

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Title:
  cpu soft lockup running kvm

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