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

goroutine 17 [running]:
github.com/google/syzkaller/prog.(*randGen).filename(0xc000451440, 0xc00010d040, 0xbf58c0, 0xc0000ed180, 0xc00058a838)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:161 +0x2e3
github.com/google/syzkaller/prog.(*BufferType).generate(0xbf58c0, 0xc000451440, 0xc00010d040, 0xc00007ca00, 0x74dda2f21c5c5f34, 0xc0002b99e8, 0x4f0c53, 0xc000359920)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:646 +0x4fc
github.com/google/syzkaller/prog.(*randGen).generateArgImpl(0xc000451440, 0xc00010d040, 0x8fd620, 0xbf58c0, 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(0xc000451440, 0xc00010d040, 0x8fd620, 0xbf58c0, 0xaaaaaaaaaaaaaaaa, 0x38, 0x7437e2, 0x87a299, 0x3)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:530 +0x52
github.com/google/syzkaller/prog.(*PtrType).generate(0xbd2f80, 0xc000451440, 0xc00010d040, 0x40b7ff, 0xc000674900, 0x30, 0x30, 0x8115a0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:729 +0x84
github.com/google/syzkaller/prog.(*randGen).generateArgImpl(0xc000451440, 0xc00010d040, 0x8fda80, 0xbd2f80, 0xc0002b9b00, 0x0, 0x0, 0x0, 0x0, 0x0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:581 +0x1b6
github.com/google/syzkaller/prog.(*randGen).generateArg(0xc000451440, 0xc00010d040, 0x8fda80, 0xbd2f80, 0x3, 0x3, 0x0, 0x203000, 0xc0002b9ce8)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:530 +0x52
github.com/google/syzkaller/prog.(*randGen).generateArgs(0xc000451440, 0xc00010d040, 0xbc8d60, 0x3, 0x3, 0x8216fce6399953b0, 0xc0002b9db0, 0x72beae, 0x7f3580, 0xc000358d20, ...)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:518 +0x11d
github.com/google/syzkaller/prog.(*randGen).generateParticularCall(0xc000451440, 0xc00010d040, 0xbde200, 0x8f, 0xc00010d040, 0xc00010d000)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:462 +0xd1
github.com/google/syzkaller/prog.(*randGen).generateCall(0xc000451440, 0xc00010d040, 0xc00010c740, 0xc00010d040, 0xc0002b9e48, 0x731217)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/rand.go:454 +0xa4
github.com/google/syzkaller/prog.(*mutator).insertCall(0xc0002b9ed0, 0x14)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:118 +0xcb
github.com/google/syzkaller/prog.(*Prog).Mutate(0xc00010c740, 0x8f8680, 0xc000359920, 0x1e, 0xc0003f8a80, 0xc000650000, 0x563, 0x6a0)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/mutation.go:32 +0x299
main.(*Proc).loop(0xc0003f8b00)
	/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