Anyway - I have that model laptop, it hangs after calling
ipi_startup() to the first AP with x2apic enabled. What can I do to
continue debugging?

Please provide the info that Kostik requested here, try out the patch, and wait for the timezone in Ukraine to be a little more reasonable for a reply.

 http://docs.FreeBSD.org/cgi/mid.cgi?20150216174658.GI34251

Use the workaround of setting hw.x2apic_enable=0 in the loader to fall back to stock APIC mode.

later,

Peter.

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