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This is the leftover from BZ#691717 that changed its nature over time.
Looks like nmi watchdog activates at random times. We should work on disabling all timer base watchdogs in all relevant guests, not waste our time debugging something that can't work. I am more concerned with KVM internal error that qemu produces.
In 6.1 softlockup and nmi watchdog was reworked by commit f5251db21f151cccb8bc5aeb11e9e21dcbd13fc2. So before we proceed in this direction we need to make sure we can reproduce problems we saw in 6.0.
Old nmi watchdog is affectively disabled on x86_64 by commit 2d09fe61. New one, that uses perf events, is disabled in a guest since KVM does not have perf counters.