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

goroutine 67 [running]:
main.diffProgInfo(0x0, 0x1eaf4?)
	/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?, {{0x3d4f, {0x4000814000, 0x11e89, 0x11e89}, 0x0, 0x0, 0x0, 0x1, 0x0}, ...})
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:386 +0x74
main.(*FuzzerTool).exchangeDataCall(0x40003d2000, 0x1, {0x4001491f68, 0x1, 0x0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:345 +0x314
main.(*FuzzerTool).exchangeDataWorker(0x40003d2000)
	/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 22:32:16.694372  282615 task_signals.go:458] [ 43112: 43112] Discarding duplicate signal 9
D0325 22:32:16.694397  282615 task_signals.go:470] [   1:   1] Notified of signal 17
D0325 22:32:16.694406  282615 task_exit.go:204] [   6:  15] Transitioning from exit state TaskExitInitiated to TaskExitZombie
D0325 22:32:16.694412  282615 task_exit.go:204] [   6:  15] Transitioning from exit state TaskExitZombie to TaskExitDead
D0325 22:32:16.694417  282615 task_exit.go:204] [   6:   6] Transitioning from exit state TaskExitZombie to TaskExitDead
D0325 22:32:16.694442  282615 task_signals.go:179] [   1:   1] Restarting syscall 98: interrupted by signal 17
D0325 22:32:16.694449  282615 task_signals.go:220] [   1:   1] Signal 17: delivering to handler
D0325 22:32:16.694659  282615 loader.go:1259] updated processes (removal): map[{ci-gvisor-arm64-ptrace-1-cover-1 0}:0x4000706f60]
D0325 22:32:16.694688  282615 controller.go:523] containerManager.Wait, cid: ci-gvisor-arm64-ptrace-1-cover-1, pid: 6, waitStatus: 0x200, err: <nil>
D0325 22:32:16.694726  282615 urpc.go:568] urpc: successfully marshalled 38 bytes.
D0325 22:32:16.702369  282735 urpc.go:611] urpc: unmarshal success.
I0325 22:32:16.702511  282735 main.go:226] Exiting with status: 512
D0325 22:32:16.793272  282615 urpc.go:611] urpc: unmarshal success.
D0325 22:32:16.807246  282615 urpc.go:568] urpc: successfully marshalled 313172 bytes.
D0325 22:32:16.825030  282615 urpc.go:611] urpc: unmarshal success.
D0325 22:32:16.825079  282615 controller.go:232] containerManager.Processes, cid: ci-gvisor-arm64-ptrace-1-cover-1
D0325 22:32:16.825316  282615 urpc.go:568] urpc: successfully marshalled 2702 bytes.
D0325 22:32:19.881525  282615 sampler.go:191] Time: Adjusting syscall overhead down to 7
D0325 22:32:20.881685  282615 sampler.go:191] Time: Adjusting syscall overhead down to 7
D0325 22:32:21.881736  282615 sampler.go:191] Time: Adjusting syscall overhead down to 7
D0325 22:32:22.881123  282615 sampler.go:191] Time: Adjusting syscall overhead down to 7
D0325 22:32:23.881530  282615 sampler.go:191] Time: Adjusting syscall overhead down to 7
I0325 22:32:25.275260  282615 watchdog.go:295] Watchdog starting loop, tasks: 27, discount: 0s