panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x28 pc=0xa00d4a]

goroutine 12 [running]:
main.diffProgInfo(0x0, 0x7fa06607c688?)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:432 +0x2a
main.(*FuzzerTool).diffMaxSignal(0xb303a0?, 0xc00058c201?)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:442 +0x97
main.(*FuzzerTool).convertExecutionResult(0x200005c8?, {{0xc0e, {0xc0013e4000, 0x13105, 0x13105}, 0x0, 0x0, 0x0, 0x1, 0x0}, ...})
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:386 +0x46
main.(*FuzzerTool).exchangeDataCall(0xc0004b6000, 0x1, {0xc000e4df78, 0x1, 0xae8300?})
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:345 +0x325
main.(*FuzzerTool).exchangeDataWorker(0xc0004b6000)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:380 +0x79
created by main.main in goroutine 1
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:272 +0x143c
I0325 22:07:34.370274   14731 main.go:226] Exiting with status: 512