Messages in this thread | | | Date | Wed, 19 Nov 2014 17:18:19 -0500 | From | Dave Jones <> | Subject | Re: frequent lockups in 3.18rc4 |
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On Wed, Nov 19, 2014 at 11:38:09AM -0800, Linus Torvalds wrote:
> > Is it possible that we've managed to return to userspace with > > interrupts off somehow? A loop in userspace that somehow has > > interrupts off can cause all kinds of fun lockups. > > That sounds unlikely, but if there is some stack corruption going on. > > However, it wouldn't even explain things, because even if interrupts > had been disabled in user space, and even if that popf got executed, > this wouldn't be where they got enabled. That would be the :"sti" in > the system call entry path (hidden behind the ENABLE_INTERRUPTS > macro). > > Of course, maybe Dave has paravirtualization enabled (what a crock > _that_ is), and there is something wrong with that whole code.
I've had HYPERVISOR_GUEST disabled for a while, which also disables the paravirt code afaics.
Dave
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