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

goroutine 16 [running]:
github.com/google/syzkaller/prog.(*randGen).filename(0xc000691740, 0xc000624a00, 0xbf6f40, 0x203000, 0xc0000602f8)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:161 +0x2e3
github.com/google/syzkaller/prog.(*BufferType).generate(0xbf6f40, 0xc000691740, 0xc000624a00, 0xc000079500, 0xed70671f8154da4, 0xc00088b9e8, 0x4f0c53, 0xc000849e00)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:646 +0x4fc
github.com/google/syzkaller/prog.(*randGen).generateArgImpl(0xc000691740, 0xc000624a00, 0x8fd620, 0xbf6f40, 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(0xc000691740, 0xc000624a00, 0x8fd620, 0xbf6f40, 0xaaaaaaaaaaaaaaaa, 0x38, 0x7437e2, 0x87a299, 0x3)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:530 +0x52
github.com/google/syzkaller/prog.(*PtrType).generate(0xbd6700, 0xc000691740, 0xc000624a00, 0x40b7ff, 0xc0006917e0, 0x20, 0x20, 0x8115a0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:729 +0x84
github.com/google/syzkaller/prog.(*randGen).generateArgImpl(0xc000691740, 0xc000624a00, 0x8fda80, 0xbd6700, 0xc00088bb00, 0x0, 0x0, 0x0, 0x0, 0x0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:581 +0x1b6
github.com/google/syzkaller/prog.(*randGen).generateArg(0xc000691740, 0xc000624a00, 0x8fda80, 0xbd6700, 0x2, 0x2, 0x0, 0x203000, 0xc00088bce8)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:530 +0x52
github.com/google/syzkaller/prog.(*randGen).generateArgs(0xc000691740, 0xc000624a00, 0xbc6da0, 0x2, 0x2, 0xb1125c09995f3ce1, 0xc00088bdb0, 0x72beae, 0x7f3580, 0xc000849230, ...)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:518 +0x11d
github.com/google/syzkaller/prog.(*randGen).generateParticularCall(0xc000691740, 0xc000624a00, 0xbe02a0, 0xdf, 0xc000624a00, 0xc00000cc18)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:462 +0xd1
github.com/google/syzkaller/prog.(*randGen).generateCall(0xc000691740, 0xc000624a00, 0xc000624980, 0xc000624a00, 0xc00088be48, 0x731217)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:454 +0xa4
github.com/google/syzkaller/prog.(*mutator).insertCall(0xc00088bed0, 0x14)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:118 +0xcb
github.com/google/syzkaller/prog.(*Prog).Mutate(0xc000624980, 0x8f8680, 0xc000849e00, 0x1e, 0xc00060a140, 0xc00074e000, 0xa2c, 0xc00)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:32 +0x299
main.(*Proc).loop(0xc00060a180)
	/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