panic: kernel diagnostic assertion "(pg->pg_flags & PG_BUSY) == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/arch/amd64/amd64/pmap.c", line 1422
Starting stack trace...
panic(ffffffff82951e03) at panic+0x16f sys/kern/subr_prf.c:229
__assert(ffffffff829083d7,ffffffff82932292,58e,ffffffff828b7a7b) at __assert+0x29 sys/kern/subr_prf.c:157
pmap_destroy(fffffd806ad166c8) at pmap_destroy+0x2c4 sys/arch/amd64/amd64/pmap.c:1422
uvm_map_teardown(fffffd80775598b0) at uvm_map_teardown+0x305 sys/uvm/uvm_map.c:2557
uvmspace_free(fffffd80775598b0) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3461
vm_teardown(ffff80002bcf32d0) at vm_teardown+0x15c sys/dev/vmm/vmm.c:555
vm_terminate(ffff80002bcf3570) at vm_terminate+0x124 sys/dev/vmm/vmm.c:688
vmmioctl(a00,80045604,ffff80002bcf3570,1,ffff8000ffff6538) at vmmioctl+0x2a1 sys/dev/vmm/vmm.c:248
VOP_IOCTL(fffffd807e754d88,80045604,ffff80002bcf3570,1,fffffd807f7d3bc8,ffff8000ffff6538) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:264
vn_ioctl(fffffd8068c0cc78,80045604,ffff80002bcf3570,ffff8000ffff6538) at vn_ioctl+0xc0 sys/kern/vfs_vnops.c:525
sys_ioctl(ffff8000ffff6538,ffff80002bcf3750,ffff80002bcf36a0) at sys_ioctl+0x4a9
syscall(ffff80002bcf3750) at syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline]
syscall(ffff80002bcf3750) at syscall+0x8cf sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xf544e6455f0, count: 244
End of stack trace.
syncing disks...26 9 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1  giving up

dump to dev 4,1 not possible
rebooting...
SeaBIOS (version 1.8.2-google)
Total RAM Size = 0x0000000080000000 = 2048 MiB
CPUs found: 2     Max CPUs supported: 2
SeaBIOS (version 1.8.2-google)
Machine UUID f8e08a03-81bc-3227-53c0-939594373760
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0
virtio-scsi blksize=512 sectors=4194304 = 2048 MiB
drive 0x000f27f0: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Sending Seabios boot VM event.
Booting from Hard Disk 0...
>> OpenBSD/amd64 BOOT 3.65
boot> show malloc
boot: illegal argument malloc
boot> show all pools
boot> machine ddbcpu 0
machine: syntax error
boot> trace
boot> machine ddbcpu 1
machine: syntax error
boot> trace