>>> On 24.05.18 at 16:24, <andrew.coop...@citrix.com> wrote: > On 24/05/18 15:22, Jan Beulich wrote: >>>>> On 24.05.18 at 16:18, <andrew.coop...@citrix.com> wrote: >>> Can you try with the "x86/traps: Dump the instruction stream even for >>> double faults" patch I've just posted, and show the full #DF panic log >>> please? (Its conceivable that there are multiple different issues here.) >> Well, as long as we're on a guest kernel stack rather than our own, I >> don't think the exact insn causing the #DF really matters. See earlier >> mails I have sent in this regard. > > In George's crash, we were in a weird place on the hypervisor stack, not > a guest stack...
Go look again - %rsp pointed outside of hypervisor space in all cases that I had looked at. And that's explained by the unmapping of the stubs: We'd #PF right after first SYSCALL, and the handler would then run on the stack that's still active from guest context. Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
