panic: Data modified on freelist: word 4 of object 0xffff800000d5b000 size 0x130 previous type free (0x6563 != 0xdeaf4152)

Starting stack trace...
panic(ffffffff82775518) at panic+0x159 sys/kern/subr_prf.c:229
malloc(130,7f,1) at malloc+0xa85 sys/kern/kern_malloc.c:362
exec_elf_makecmds(ffff800021696008,ffff80002983a770) at exec_elf_makecmds+0xd7d sys/kern/exec_elf.c:592
check_exec(ffff800021696008,ffff80002983a770) at check_exec+0x30f sys/kern/kern_exec.c:198
sys_execve(ffff800021696008,ffff80002983ab50,ffff80002983aba0) at sys_execve+0x211 sys/kern/kern_exec.c:316
syscall(ffff80002983ac20) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x77693102e820, count: 250
End of stack trace.
syncing disks...21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21  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 d662f6a5-d763-0b53-7cd8-e4e6b0001699
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 0x000f28a0: 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