panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x28 pc=0x7af7a9]

goroutine 23 [running]:
github.com/google/syzkaller/sys/openbsd.(*arch).SanitizeCall(0xc00000d560, 0xc003df5800)
	/syzkaller/gopath/src/github.com/google/syzkaller/sys/openbsd/init.go:75 +0x29
github.com/google/syzkaller/prog.(*Prog).Mutate(0xc003e1dfc0, 0x9a0ac0, 0xc00432e510, 0x1e, 0xc004316dc0, 0xc0006d0000, 0x1eb7, 0x2400)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:50 +0x331
main.(*Proc).loop(0xc004316e00)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:99 +0x434
created by main.main
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:259 +0x114c
       