panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x28 pc=0x5a6c84] goroutine 1 [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?, {{0xc8b, {0x40014de000, 0x125bb, 0x125bb}, 0x0, 0x0, 0x0, 0x1, 0x0}, ...}) /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:386 +0x74 main.(*FuzzerTool).exchangeDataCall(0x4000458000, 0x1, {0x4001813a58, 0x1, 0x4000e8f908?}) /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:345 +0x314 main.(*FuzzerTool).exchangeDataWorker(0x4000458000) /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:380 +0x58 main.main() /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:273 +0x1100 D0325 20:27:48.222487 240766 task_signals.go:204] [ 7: 7] Signal 9, PID: 7, TID: 7, fault addr: 0x0: terminating thread group D0325 20:27:48.222500 240766 task_signals.go:204] [ 6369: 6369] Signal 9, PID: 6369, TID: 6369, fault addr: 0x0: terminating thread group D0325 20:27:48.222506 240766 task_exit.go:204] [ 6369: 6369] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 20:27:48.222505 240766 task_signals.go:204] [ 7: 177] Signal 9, PID: 7, TID: 177, fault addr: 0x0: terminating thread group D0325 20:27:48.222534 240766 task_exit.go:204] [ 7: 177] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 20:27:48.222555 240766 task_exit.go:204] [ 7: 177] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 20:27:48.222560 240766 task_exit.go:204] [ 7: 177] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 20:27:48.222576 240766 task_signals.go:204] [ 7: 14] Signal 9, PID: 7, TID: 14, fault addr: 0x0: terminating thread group D0325 20:27:48.222584 240766 task_exit.go:204] [ 7: 14] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 20:27:48.222592 240766 task_exit.go:204] [ 7: 14] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 20:27:48.222596 240766 task_exit.go:204] [ 7: 14] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 20:27:48.222607 240766 task_signals.go:204] [ 7: 16] Signal 9, PID: 7, TID: 16, fault addr: 0x0: terminating thread group D0325 20:27:48.222614 240766 task_exit.go:204] [ 7: 16] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 20:27:48.222622 240766 task_exit.go:204] [ 7: 16] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 20:27:48.222626 240766 task_exit.go:204] [ 7: 16] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 20:27:48.222637 240766 task_signals.go:204] [ 7: 17] Signal 9, PID: 7, TID: 17, fault addr: 0x0: terminating thread group D0325 20:27:48.222643 240766 task_exit.go:204] [ 7: 17] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 20:27:48.222651 240766 task_exit.go:204] [ 7: 17] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 20:27:48.222659 240766 task_exit.go:204] [ 7: 17] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 20:27:48.222669 240766 task_exit.go:204] [ 7: 7] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 20:27:48.222681 240766 task_signals.go:458] [ 6369: 6369] Discarding duplicate signal 9 D0325 20:27:48.222688 240766 task_exit.go:204] [ 7: 7] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 20:27:48.222703 240766 task_signals.go:204] [ 7: 8] Signal 9, PID: 7, TID: 8, fault addr: 0x0: terminating thread group D0325 20:27:48.222710 240766 task_exit.go:204] [ 7: 8] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 20:27:48.222720 240766 task_signals.go:458] [ 6369: 6369] Discarding duplicate signal 9 D0325 20:27:48.222726 240766 task_exit.go:204] [ 7: 8] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 20:27:48.222729 240766 task_exit.go:204] [ 7: 8] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 20:27:48.222737 240766 task_exit.go:204] [ 7: 13] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 20:27:48.222750 240766 task_signals.go:458] [ 6369: 6369] Discarding duplicate signal 9 D0325 20:27:48.222756 240766 task_exit.go:204] [ 7: 13] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 20:27:48.222760 240766 task_exit.go:204] [ 7: 13] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 20:27:48.222773 240766 task_signals.go:204] [ 7: 2553] Signal 9, PID: 7, TID: 2553, fault addr: 0x0: terminating thread group D0325 20:27:48.222781 240766 task_exit.go:204] [ 7: 2553] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 20:27:48.222788 240766 task_exit.go:204] [ 7: 2553] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 20:27:48.222796 240766 task_exit.go:204] [ 7: 2553] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 20:27:48.222809 240766 task_signals.go:204] [ 7: 1415] Signal 9, PID: 7, TID: 1415, fault addr: 0x0: terminating thread group D0325 20:27:48.222815 240766 task_exit.go:204] [ 7: 1415] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 20:27:48.222823 240766 task_signals.go:458] [ 6369: 6369] Discarding duplicate signal 9 D0325 20:27:48.222828 240766 task_exit.go:204] [ 7: 1415] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 20:27:48.222832 240766 task_exit.go:204] [ 7: 1415] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 20:27:48.222844 240766 task_signals.go:204] [ 7: 6368] Signal 9, PID: 7, TID: 6368, fault addr: 0x0: terminating thread group D0325 20:27:48.222904 240766 task_exit.go:204] [ 7: 6368] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 20:27:48.222912 240766 task_signals.go:458] [ 6369: 6369] Discarding duplicate signal 9 D0325 20:27:48.222917 240766 task_exit.go:204] [ 7: 6368] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 20:27:48.222921 240766 task_exit.go:204] [ 7: 6368] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 20:27:48.222932 240766 task_signals.go:204] [ 7: 7217] Signal 9, PID: 7, TID: 7217, fault addr: 0x0: terminating thread group D0325 20:27:48.222938 240766 task_exit.go:204] [ 7: 7217] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 20:27:48.237546 240848 urpc.go:611] urpc: unmarshal success. I0325 20:27:48.237645 240848 main.go:226] Exiting with status: 512 D0325 20:27:48.235789 240766 task_signals.go:458] [ 6369: 6369] Discarding duplicate signal 9 D0325 20:27:48.235823 240766 task_exit.go:204] [ 7: 7217] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 20:27:48.235835 240766 task_exit.go:204] [ 7: 7217] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 20:27:48.235842 240766 task_exit.go:204] [ 7: 7] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 20:27:48.237330 240766 loader.go:1259] updated processes (removal): map[{ci-gvisor-arm64-systrap-1-cover-0 0}:0x40001c0930] D0325 20:27:48.237376 240766 controller.go:523] containerManager.Wait, cid: ci-gvisor-arm64-systrap-1-cover-0, pid: 7, waitStatus: 0x200, err: D0325 20:27:48.237438 240766 urpc.go:568] urpc: successfully marshalled 38 bytes. D0325 20:27:48.250741 240766 task_signals.go:481] [ 6370( 1): 6370( 1)] No task notified of signal 9 D0325 20:27:48.250821 240766 task_exit.go:204] [ 6369: 6369] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 20:27:48.250837 240766 task_signals.go:470] [ 1: 1] Notified of signal 17 D0325 20:27:48.251357 240766 task_signals.go:179] [ 1: 1] Restarting syscall 98: interrupted by signal 17 D0325 20:27:48.251397 240766 task_signals.go:220] [ 1: 1] Signal 17: delivering to handler D0325 20:27:48.252759 240766 task_signals.go:204] [ 6370( 1): 6370( 1)] Signal 9, PID: 6370, TID: 6370, fault addr: 0x0: terminating thread group D0325 20:27:48.252783 240766 task_exit.go:204] [ 6370( 1): 6370( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 20:27:48.253461 240766 task_exit.go:361] [ 6370( 1): 6370( 1)] Init process terminating, killing namespace D0325 20:27:48.253482 240766 task_signals.go:481] [ 8192(1822): 8192(1822)] No task notified of signal 9 D0325 20:27:48.253492 240766 task_exit.go:204] [ 8192(1822): 8192(1822)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 20:27:48.253505 240766 task_exit.go:204] [ 6370( 1): 6370( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 20:27:48.253513 240766 task_signals.go:476] [ 1: 2] Notified of group signal 17 D0325 20:27:48.254690 240766 task_signals.go:220] [ 1: 1] Signal 17: delivering to handler D0325 20:27:48.256627 240766 task_run.go:183] [ 1: 2] Restarting syscall 98 with restart block: not interrupted by handled signal D0325 20:27:48.303415 240766 urpc.go:611] urpc: unmarshal success. D0325 20:27:48.314239 240766 urpc.go:568] urpc: successfully marshalled 64104 bytes. D0325 20:27:48.326327 240766 urpc.go:611] urpc: unmarshal success. D0325 20:27:48.326371 240766 controller.go:232] containerManager.Processes, cid: ci-gvisor-arm64-systrap-1-cover-0 D0325 20:27:48.326536 240766 urpc.go:568] urpc: successfully marshalled 835 bytes. D0325 20:27:50.846260 240766 sampler.go:191] Time: Adjusting syscall overhead down to 7