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

goroutine 16 [running]:
github.com/google/syzkaller/prog.(*randGen).filename(0xc000615960, 0xc000786b40, 0xbf5640, 0x2, 0x2)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:161 +0x2e3
github.com/google/syzkaller/prog.(*BufferType).generate(0xbf5640, 0xc000615960, 0xc000786b40, 0xc00007b500, 0x672e3f68198bd01b, 0xc0004699e8, 0x4f0c53, 0xc0002be7e0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:646 +0x4fc
github.com/google/syzkaller/prog.(*randGen).generateArgImpl(0xc000615960, 0xc000786b40, 0x8fd620, 0xbf5640, 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(0xc000615960, 0xc000786b40, 0x8fd620, 0xbf5640, 0x0, 0x0, 0x7437e2, 0x87a299, 0x3)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:530 +0x52
github.com/google/syzkaller/prog.(*PtrType).generate(0xbd2a40, 0xc000615960, 0xc000786b40, 0x8, 0x8, 0xc00000c730, 0x0, 0xc000221180)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:729 +0x84
github.com/google/syzkaller/prog.(*randGen).generateArgImpl(0xc000615960, 0xc000786b40, 0x8fda80, 0xbd2a40, 0xc000469b00, 0x0, 0x0, 0x0, 0x0, 0x0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:581 +0x1b6
github.com/google/syzkaller/prog.(*randGen).generateArg(0xc000615960, 0xc000786b40, 0x8fda80, 0xbd2a40, 0xc00000c6c0, 0x1, 0x1, 0x1, 0x1)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:530 +0x52
github.com/google/syzkaller/prog.(*randGen).generateArgs(0xc000615960, 0xc000786b40, 0xbcf260, 0x4, 0x4, 0xc9fe6cbfcae3505b, 0xc000469db0, 0x72beae, 0x7f3580, 0xc000269a40, ...)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:518 +0x11d
github.com/google/syzkaller/prog.(*randGen).generateParticularCall(0xc000615960, 0xc000786b40, 0xbddea0, 0x87, 0xc000786b40, 0xc000330ac0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:462 +0xd1
github.com/google/syzkaller/prog.(*randGen).generateCall(0xc000615960, 0xc000786b40, 0xc000786a40, 0xc000786b40, 0xc000469e48, 0x731217)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:454 +0xa4
github.com/google/syzkaller/prog.(*mutator).insertCall(0xc000469ed0, 0x14)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:118 +0xcb
github.com/google/syzkaller/prog.(*Prog).Mutate(0xc000786a40, 0x8f8680, 0xc0002be7e0, 0x1e, 0xc0003ac3c0, 0xc000646000, 0x4e6, 0x500)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:32 +0x299
main.(*Proc).loop(0xc0003ac400)
	/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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