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

goroutine 17 [running]:
github.com/google/syzkaller/prog.(*randGen).filename(0xc00094dae0, 0xc00094a500, 0xbf5460, 0xc000220a80, 0xc000632e38)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:161 +0x2e3
github.com/google/syzkaller/prog.(*BufferType).generate(0xbf5460, 0xc00094dae0, 0xc00094a500, 0xc00007ca00, 0x59737218a0b7ef13, 0xc00086b9e8, 0x4f0c53, 0xc00045d680)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:646 +0x4fc
github.com/google/syzkaller/prog.(*randGen).generateArgImpl(0xc00094dae0, 0xc00094a500, 0x8fd620, 0xbf5460, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:581 +0x1b6
github.com/google/syzkaller/prog.(*randGen).generateArg(0xc00094dae0, 0xc00094a500, 0x8fd620, 0xbf5460, 0xaaaaaaaaaaaaaaaa, 0x38, 0x7437e2, 0x87a299, 0x3)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:530 +0x52
github.com/google/syzkaller/prog.(*PtrType).generate(0xbd2860, 0xc00094dae0, 0xc00094a500, 0x40b7ff, 0xc00097d530, 0x30, 0x30, 0x8115a0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:729 +0x84
github.com/google/syzkaller/prog.(*randGen).generateArgImpl(0xc00094dae0, 0xc00094a500, 0x8fda80, 0xbd2860, 0xc00086bb00, 0x0, 0x0, 0x0, 0x0, 0x0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:581 +0x1b6
github.com/google/syzkaller/prog.(*randGen).generateArg(0xc00094dae0, 0xc00094a500, 0x8fda80, 0xbd2860, 0x3, 0x3, 0xc00094a540, 0x40, 0xc00086bce8)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:530 +0x52
github.com/google/syzkaller/prog.(*randGen).generateArgs(0xc00094dae0, 0xc00094a500, 0xbc8b20, 0x3, 0x3, 0x97c8c947f1fa6cd4, 0xc00086bdb0, 0x72beae, 0x7f3580, 0xc00045ca80, ...)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:518 +0x11d
github.com/google/syzkaller/prog.(*randGen).generateParticularCall(0xc00094dae0, 0xc00094a500, 0xbddde0, 0x85, 0xc00094a500, 0xc000945bd0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:462 +0xd1
github.com/google/syzkaller/prog.(*randGen).generateCall(0xc00094dae0, 0xc00094a500, 0xc00094a400, 0xc00094a500, 0xc00086be48, 0x731217)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:454 +0xa4
github.com/google/syzkaller/prog.(*mutator).insertCall(0xc00086bed0, 0x14)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:118 +0xcb
github.com/google/syzkaller/prog.(*Prog).Mutate(0xc00094a400, 0x8f8680, 0xc00045d680, 0x1e, 0xc0005cf240, 0xc0007de000, 0xa26, 0xc00)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:32 +0x299
main.(*Proc).loop(0xc0005cf2c0)
	/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
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