[Bug 269823] rand_harvest produces 100%CPU on 1 CPU with virtio_random.ko loaded

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From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 25 Feb 2023 19:53:04 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269823

--- Comment #2 from Mina Galić <freebsd@igalic.co> ---
not much different or unexpected from procstat kstack either:

root@freebsd:~ # procstat -w 1 kstack -v 6
  PID    TID COMM                TDNAME              KSTACK
    6 100074 rand_harvestq       -                   vtrnd_read+0xa4
random_kthread+0x174 fork_exit+0x80 fork_trampoline+0xe
    6 100074 rand_harvestq       -                   vtrnd_read+0xa4
random_kthread+0x174 fork_exit+0x80 fork_trampoline+0xe
    6 100074 rand_harvestq       -                   vtrnd_read+0xa4
random_kthread+0x174 fork_exit+0x80 fork_trampoline+0xe
    6 100074 rand_harvestq       -                   vtrnd_read+0xa4
random_kthread+0x174 fork_exit+0x80 fork_trampoline+0xe
    6 100074 rand_harvestq       -                   vtrnd_read+0xa4
random_kthread+0x174 fork_exit+0x80 fork_trampoline+0xe
    6 100074 rand_harvestq       -                   vtrnd_read+0xa4
random_kthread+0x174 fork_exit+0x80 fork_trampoline+0xe
    6 100074 rand_harvestq       -                   vtrnd_read+0xa4
random_kthread+0x174 fork_exit+0x80 fork_trampoline+0xe
    6 100074 rand_harvestq       -                   vtrnd_read+0xa4
random_kthread+0x174 fork_exit+0x80 fork_trampoline+0xe
    6 100074 rand_harvestq       -                   vtrnd_read+0xa4
random_kthread+0x174 fork_exit+0x80 fork_trampoline+0xe
    6 100074 rand_harvestq       -                   vtrnd_read+0xa4
random_kthread+0x174 fork_exit+0x80 fork_trampoline+0xe
    6 100074 rand_harvestq       -                   vtrnd_read+0xa4
random_kthread+0x174 fork_exit+0x80 fork_trampoline+0xe
    6 100074 rand_harvestq       -                   vtrnd_read+0xa4
random_kthread+0x174 fork_exit+0x80 fork_trampoline+0xe
    6 100074 rand_harvestq       -                   vtrnd_read+0xa4
random_kthread+0x174 fork_exit+0x80 fork_trampoline+0xe
    6 100074 rand_harvestq       -                   vtrnd_read+0xa4
random_kthread+0x174 fork_exit+0x80 fork_trampoline+0xe
    6 100074 rand_harvestq       -                   vtrnd_read+0xa4
random_kthread+0x174 fork_exit+0x80 fork_trampoline+0xe
    6 100074 rand_harvestq       -                   vtrnd_read+0xa4
random_kthread+0x174 fork_exit+0x80 fork_trampoline+0xe

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