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The the added test for exception from exception corner case.
"BUG: spinlock lockup" fails to respect panic_on_warn and panic
after printing report (though, it's a BUG already, so it should
have been paniced even without panic_on_warn).
As the result we got "spinlock lockup" followed by "rcu stall" report.
And we have that special exception for rcu stalls b/c for them
the most of the report is irrelevant up to apic_timer_interrupt frame.
The code did not expect this weird double-report case and skipped
everything up to apic_timer_interrupt, though it's actually
a lockup in netfilter code.
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