[Bug 219846] [panic] [kevent] mutex nm_kn_lock not owned, netmap with INVARIANTS+WITNESS

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219846

--- Comment #7 from Aleksandr Fedorov <aleksandr.fedorov at itglobal.com> ---
bhyve trace with userstack:

dtrace: script './nm_os_selwakeup.d' matched 1 probe
CPU     ID                    FUNCTION:NAME
 20  39521            nm_os_selwakeup:entry
              kernel`netmap_notify+0x1d
              kernel`nm_vale_flush+0xb70
              kernel`netmap_vale_vp_txsync+0x51d
              kernel`netmap_ioctl+0x4e1
              kernel`freebsd_netmap_ioctl+0x88
              kernel`devfs_ioctl+0xca
              kernel`VOP_IOCTL_APV+0x63
              kernel`vn_ioctl+0x124
              kernel`devfs_ioctl_f+0x1f
              kernel`kern_ioctl+0x29b
              kernel`sys_ioctl+0x15d
              kernel`amd64_syscall+0x276
              kernel`0xffffffff8107a81d

              libc.so.7`ioctl+0xa
              bhyve`pci_vtnet_netmap_tx+0x91
              bhyve`pci_vtnet_proctx+0x1a4
              bhyve`pci_vtnet_tx_thread+0x1ce
              libthr.so.3`0x800689756


 19  39521            nm_os_selwakeup:entry
              kernel`netmap_notify+0x1d
              kernel`netmap_poll+0x5e6
              kernel`netmap_knrw+0x6f
              kernel`kqueue_kevent+0x56d
              kernel`kern_kevent_fp+0x97
              kernel`kern_kevent+0x9f
              kernel`kern_kevent_generic+0x70
              kernel`sys_kevent+0x61
              kernel`amd64_syscall+0x276
              kernel`0xffffffff8107a81d

              libc.so.7`_kevent+0xa
              bhyve`mevent_dispatch+0x2d4
              bhyve`main+0x848
              bhyve`_start+0x11b
              ld-elf.so.1`0x80029c000

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