panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x28 pc=0x5a6c84]

goroutine 56 [running]:
main.diffProgInfo(0x0, 0x0?)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:432 +0x24
main.(*FuzzerTool).diffMaxSignal(0x38?, 0x6d9fa0?)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:442 +0xb8
main.(*FuzzerTool).convertExecutionResult(0x64c720?, {{0x121a, {0x4001162000, 0x18b64, 0x18b64}, 0x0, 0x0, 0x0, 0x1, 0x0}, ...})
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:386 +0x74
main.(*FuzzerTool).exchangeDataCall(0x40004580f0, 0x1, {0x40012fdf68, 0x1, 0x691f00?})
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:345 +0x314
main.(*FuzzerTool).exchangeDataWorker(0x40004580f0)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:380 +0x58
created by main.main in goroutine 1
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:272 +0x10f8
D0325 22:36:13.611492  308353 urpc.go:611] urpc: unmarshal success.
I0325 22:36:13.611603  308353 main.go:226] Exiting with status: 512
D0325 22:36:13.610647  308273 task_signals.go:204] [ 10339(   1): 10339(   1)] Signal 9, PID: 10339, TID: 10339, fault addr: 0x0: terminating thread group
D0325 22:36:13.610679  308273 task_exit.go:204] [ 10339(   1): 10339(   1)] Transitioning from exit state TaskExitNone to TaskExitInitiated
D0325 22:36:13.610724  308273 task_signals.go:204] [ 9084(   1): 9084(   1)] Signal 9, PID: 9084, TID: 9084, fault addr: 0x0: terminating thread group
D0325 22:36:13.610754  308273 task_exit.go:204] [ 9084(   1): 9084(   1)] Transitioning from exit state TaskExitNone to TaskExitInitiated
D0325 22:36:13.611019  308273 task_exit.go:361] [ 10339(   1): 10339(   1)] Init process terminating, killing namespace
D0325 22:36:13.611038  308273 task_exit.go:204] [ 10339(   1): 10339(   1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie
D0325 22:36:13.611056  308273 task_signals.go:470] [   1:   1] Notified of signal 17
D0325 22:36:13.611132  308273 task_signals.go:179] [   1:   1] Restarting syscall 98: interrupted by signal 17
D0325 22:36:13.611139  308273 task_signals.go:220] [   1:   1] Signal 17: delivering to handler
D0325 22:36:13.611280  308273 loader.go:1259] updated processes (removal): map[{ci-gvisor-arm64-ptrace-1-0 0}:0x400022ca50]
D0325 22:36:13.611306  308273 controller.go:523] containerManager.Wait, cid: ci-gvisor-arm64-ptrace-1-0, pid: 7, waitStatus: 0x200, err: <nil>
D0325 22:36:13.611374  308273 urpc.go:568] urpc: successfully marshalled 38 bytes.
D0325 22:36:13.611988  308273 task_exit.go:361] [ 9084(   1): 9084(   1)] Init process terminating, killing namespace
D0325 22:36:13.612009  308273 task_exit.go:204] [ 9084(   1): 9084(   1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie
D0325 22:36:13.612019  308273 task_signals.go:470] [   1:   1] Notified of signal 17
D0325 22:36:13.612156  308273 task_signals.go:179] [   1:   1] Restarting syscall 98: interrupted by signal 17
D0325 22:36:13.612162  308273 task_signals.go:220] [   1:   1] Signal 17: delivering to handler
D0325 22:36:13.698679  308273 urpc.go:611] urpc: unmarshal success.
D0325 22:36:13.703440  308273 urpc.go:568] urpc: successfully marshalled 60796 bytes.
D0325 22:36:13.710850  308273 urpc.go:611] urpc: unmarshal success.
D0325 22:36:13.710914  308273 controller.go:232] containerManager.Processes, cid: ci-gvisor-arm64-ptrace-1-0
D0325 22:36:13.711190  308273 urpc.go:568] urpc: successfully marshalled 2324 bytes.
D0325 22:36:14.547930  308273 sampler.go:191] Time: Adjusting syscall overhead down to 7
D0325 22:36:15.547827  308273 sampler.go:191] Time: Adjusting syscall overhead down to 7
D0325 22:36:16.547840  308273 sampler.go:191] Time: Adjusting syscall overhead down to 7
D0325 22:36:17.548266  308273 sampler.go:191] Time: Adjusting syscall overhead down to 7