[Bug 254513] virtio_random: random_harvestq spinning on a CPU with Q35 virtio random device

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254513

--- Comment #9 from Matthias Andree <mandree at FreeBSD.org> ---
without module:
ern.random.fortuna.concurrent_read: 1
kern.random.fortuna.minpoolsize: 128
kern.random.rdrand.rdrand_independent_seed: 0
kern.random.use_chacha20_cipher: 1
kern.random.block_seeded_status: 0
kern.random.random_sources: 
kern.random.harvest.mask_symbolic:
[UMA],[FS_ATIME],SWI,[INTERRUPT],NET_NG,[NET_ETHER],NET_TUN,MOUSE,KEYBOARD,ATTACH,CACHED
kern.random.harvest.mask_bin: 000000000000000101011111
kern.random.harvest.mask: 351
kern.random.initial_seeding.disable_bypass_warnings: 0
kern.random.initial_seeding.arc4random_bypassed_before_seeding: 0
kern.random.initial_seeding.read_random_bypassed_before_seeding: 0
kern.random.initial_seeding.bypass_before_seeding: 1

with module:
kern.random.fortuna.concurrent_read: 1
kern.random.fortuna.minpoolsize: 128
kern.random.rdrand.rdrand_independent_seed: 0
kern.random.use_chacha20_cipher: 1
kern.random.block_seeded_status: 0
kern.random.random_sources: 'VirtIO Entropy Adapter'
kern.random.harvest.mask_symbolic:
PURE_VIRTIO,[UMA],[FS_ATIME],SWI,[INTERRUPT],NET_NG,[NET_ETHER],NET_TUN,MOUSE,KEYBOARD,ATTACH,CACHED
kern.random.harvest.mask_bin: 000001000000000101011111
kern.random.harvest.mask: 262495
kern.random.initial_seeding.disable_bypass_warnings: 0
kern.random.initial_seeding.arc4random_bypassed_before_seeding: 0
kern.random.initial_seeding.read_random_bypassed_before_seeding: 0
kern.random.initial_seeding.bypass_before_seeding: 1

The system does not respond to setting kern.random.harvest.mask:
# sysctl kern.random.harvest.mask=351
kern.random.harvest.mask: 262495 -> 262495

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