exit: Detect and fix irq disabled state in oops

If a task oopses with irqs disabled, this can cause various cascading
problems in the oops path such as sleep-from-invalid warnings, and
potentially worse.

Since commit 0258b5fd7c712 ("coredump: Limit coredumps to a single
thread group"), the unconditional irq enable in coredump_task_exit()
will "fix" the irq state to be enabled early in do_exit(), so currently
this may not be triggerable, but that is coincidental and fragile.

Detect and fix the irqs_disabled() condition in the oops path before
calling do_exit(), similarly to the way in_atomic() is handled.

Reported-by: Michael Ellerman <[email protected]>
Signed-off-by: Nicholas Piggin <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Acked-by: "Eric W. Biederman" <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected]/

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