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

goroutine 1 [running]:
main.diffProgInfo(0x0, 0x7fe1ae711768?)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:432 +0x2a
main.(*FuzzerTool).diffMaxSignal(0xb303a0?, 0xc000578201?)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:442 +0x97
main.(*FuzzerTool).convertExecutionResult(0x4?, {{0x2e3c, {0xc000d5c000, 0x17d17, 0x17d17}, 0x0, 0x0, 0x0, 0x1, 0x0}, ...})
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:386 +0x46
main.(*FuzzerTool).exchangeDataCall(0xc0004be000, 0x1, {0xc001405a70, 0x1, 0xae8300?})
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:345 +0x325
main.(*FuzzerTool).exchangeDataWorker(0xc0004be000)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:380 +0x79
main.main()
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:273 +0x1449
I0325 20:52:16.081636    8762 main.go:226] Exiting with status: 512