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CONTAP-755343: Bug public information is not yet available.

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ontap-9
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core
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Issue

Panic event with the following signature:
PANIC: page fault (supervisor read data, page not present) on VA 0x8 in SK process dense_scheduler at prod/common/dense/scheduler.c:1160
AND crashing instruction is TAILQ_INSERT_TAIL(op->do_head_ptr, op, do_link) on the op_processed && dpv_mpflags & DAO_REQUEST_FLAGS re-queue path
AND op->do_head_ptr observed NULL after a concurrent dense_admin compaction-disable / dedup-teardown cleared it while scheduler lock was dropped
AND burst of SnapMirror resync snapshot-restore activity (e.g. ~9 concurrent restores driving ~4 compaction-disable events/min) precedes the panic
Predominantly observed: SnapMirror resync bursts that trigger concurrent dense compaction-disable teardown against active dense_scheduler ops.

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