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SubjectXen PV seems to be broken on Linus' tree
I'm doing:

/usr/bin/qemu-system-x86_64 -machine accel=kvm:tcg -cpu host -net none
-nographic -kernel xen-4.8.2 -initrd './arch/x86/boot/bzImage' -m 2G
-smp 2 -append console=com1

With Linus' commit c8a0739b185d11d6e2ca7ad9f5835841d1cfc765 and the
attached config.

It dies with a bunch of sensible log lines and then:

(XEN) d0v0 Unhandled invalid opcode fault/trap [#6, ec=0000]
(XEN) domain_crash_sync called from entry.S: fault at ffff82d08023961a
(XEN) Domain 0 (vcpu#0) crashed on cpu#0:
(XEN) ----[ Xen-4.8.2 x86_64 debug=n Not tainted ]----
(XEN) CPU: 0
(XEN) RIP: e033:[<ffffffff811226eb>]
(XEN) RFLAGS: 0000000000000296 EM: 1 CONTEXT: pv guest (d0v0)
(XEN) rax: 000000000000002f rbx: ffffffff81e65a48 rcx: ffffffff81e71288
(XEN) rdx: ffffffff81e27500 rsi: 0000000000000001 rdi: ffffffff81133f88
(XEN) rbp: 0000000000000000 rsp: ffffffff81e03e78 r8: 0000000000000000
(XEN) r9: 0000000000000001 r10: 0000000000000000 r11: 0000000000000000
(XEN) r12: 0000000000000000 r13: 0000000000000001 r14: 0000000000000001
(XEN) r15: 0000000000000000 cr0: 000000008005003b cr4: 00000000003506e0
(XEN) cr3: 000000007b0b3000 cr2: 0000000000000000
(XEN) ds: 0000 es: 0000 fs: 0000 gs: 0000 ss: e02b cs: e033
(XEN) Guest stack trace from rsp=ffffffff81e03e78:
(XEN) ffffffff81e71288 0000000000000000 ffffffff811226eb 000000010000e030
(XEN) 0000000000010096 ffffffff81e03eb8 000000000000e02b ffffffff811226eb
(XEN) ffffffff81122c2e 0000000000000200 0000000000000000 0000000000000000
(XEN) 0000000000000030 ffffffff81c69cf5 ffffffff81080b20 ffffffff81080560
(XEN) 0000000000000000 ffffffff810d3741 ffffffff8107b420 ffffffff81094660

Is this familiar?

I'll feel really dumb if it ends up being my fault.
[unhandled content-type:application/octet-stream]
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