panic: sandbox escaping file name "../file0", Files are map[../file0:true]

goroutine 17 [running]:
github.com/google/syzkaller/prog.(*randGen).filename(0xc0009c1700, 0xc0009c4540, 0xbf7b20, 0x1, 0x1)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:161 +0x2e3
github.com/google/syzkaller/prog.(*BufferType).generate(0xbf7b20, 0xc0009c1700, 0xc0009c4540, 0xc00007aa00, 0x4055671e70291c46, 0xc0007279e8, 0x4f0c53, 0xc000477b60)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:646 +0x4fc
github.com/google/syzkaller/prog.(*randGen).generateArgImpl(0xc0009c1700, 0xc0009c4540, 0x8fd620, 0xbf7b20, 0x300, 0x0, 0x0, 0x0, 0x0, 0x0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:581 +0x1b6
github.com/google/syzkaller/prog.(*randGen).generateArg(0xc0009c1700, 0xc0009c4540, 0x8fd620, 0xbf7b20, 0x0, 0x0, 0x7437e2, 0x87a299, 0x3)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:530 +0x52
github.com/google/syzkaller/prog.(*PtrType).generate(0xbd8b60, 0xc0009c1700, 0xc0009c4540, 0x8, 0x8, 0xc0006064e0, 0x0, 0xc00003ee00)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:729 +0x84
github.com/google/syzkaller/prog.(*randGen).generateArgImpl(0xc0009c1700, 0xc0009c4540, 0x8fda80, 0xbd8b60, 0xc000727b00, 0x0, 0x0, 0x0, 0x0, 0x0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:581 +0x1b6
github.com/google/syzkaller/prog.(*randGen).generateArg(0xc0009c1700, 0xc0009c4540, 0x8fda80, 0xbd8b60, 0xc0006064c8, 0x1, 0x1, 0x1, 0x1)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:530 +0x52
github.com/google/syzkaller/prog.(*randGen).generateArgs(0xc0009c1700, 0xc0009c4540, 0xbcf9a0, 0x4, 0x4, 0x5947bf14bf46aedd, 0xc000727db0, 0x72beae, 0x7f3580, 0xc0005bdcb0, ...)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:518 +0x11d
github.com/google/syzkaller/prog.(*randGen).generateParticularCall(0xc0009c1700, 0xc0009c4540, 0xbe1e00, 0x17, 0xc0009c4540, 0xc0006064b8)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:462 +0xd1
github.com/google/syzkaller/prog.(*randGen).generateCall(0xc0009c1700, 0xc0009c4540, 0xc0009c44c0, 0xc0009c4540, 0xc000727e48, 0x731217)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:454 +0xa4
github.com/google/syzkaller/prog.(*mutator).insertCall(0xc000727ed0, 0x14)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:118 +0xcb
github.com/google/syzkaller/prog.(*Prog).Mutate(0xc0009c44c0, 0x8f8680, 0xc000477b60, 0x1e, 0xc0002e2080, 0xc000732000, 0xa2e, 0xc00)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:32 +0x299
main.(*Proc).loop(0xc0002e2240)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:99 +0x446created by main.main
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:236 +0xfe2
login: