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?, {{0x16f4, {0x40015c0000, 0x126a3, 0x126a3}, 0x0, 0x0, 0x0, 0x1, 0x0}, ...}) /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:386 +0x74 main.(*FuzzerTool).exchangeDataCall(0x400045a000, 0x1, {0x40007c7a58, 0x1, 0x691f00?}) /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:345 +0x314 main.(*FuzzerTool).exchangeDataWorker(0x400045a000) /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 22:21:15.648932 301177 urpc.go:611] urpc: unmarshal success. I0325 22:21:15.649015 301177 main.go:226] Exiting with status: 512 D0325 22:21:15.646257 301113 task_signals.go:204] [ 12070: 12070] Signal 9, PID: 12070, TID: 12070, fault addr: 0x0: terminating thread group D0325 22:21:15.646305 301113 task_exit.go:204] [ 12070: 12070] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:21:15.646340 301113 task_signals.go:204] [ 5910: 5910] Signal 9, PID: 5910, TID: 5910, fault addr: 0x0: terminating thread group D0325 22:21:15.646368 301113 task_exit.go:204] [ 5910: 5910] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:21:15.646446 301113 task_signals.go:470] [ 5912( 1): 5912( 1)] Notified of signal 9 D0325 22:21:15.646456 301113 task_exit.go:204] [ 5910: 5910] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:21:15.646464 301113 task_signals.go:481] [ 6: 6] No task notified of signal 17 D0325 22:21:15.646518 301113 task_signals.go:470] [ 12075( 1): 12075( 1)] Notified of signal 9 D0325 22:21:15.646525 301113 task_exit.go:204] [ 12070: 12070] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:21:15.646536 301113 task_signals.go:458] [ 6: 6] Discarding duplicate signal 17 D0325 22:21:15.646587 301113 task_signals.go:204] [ 11910: 11910] Signal 9, PID: 11910, TID: 11910, fault addr: 0x0: terminating thread group D0325 22:21:15.646595 301113 task_signals.go:204] [ 19: 19] Signal 9, PID: 19, TID: 19, fault addr: 0x0: terminating thread group D0325 22:21:15.646598 301113 task_exit.go:204] [ 11910: 11910] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:21:15.646680 301113 task_signals.go:204] [ 5912( 1): 5912( 1)] Signal 9, PID: 5912, TID: 5912, fault addr: 0x0: terminating thread group D0325 22:21:15.647012 301113 task_signals.go:204] [ 12075( 1): 12075( 1)] Signal 9, PID: 12075, TID: 12075, fault addr: 0x0: terminating thread group D0325 22:21:15.647140 301113 task_signals.go:481] [ 11911( 1): 11911( 1)] No task notified of signal 9 D0325 22:21:15.647151 301113 task_signals.go:470] [ 24( 1): 24( 1)] Notified of signal 13 D0325 22:21:15.647176 301113 task_exit.go:204] [ 11910: 11910] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:21:15.647184 301113 task_signals.go:458] [ 6: 6] Discarding duplicate signal 17 D0325 22:21:15.647212 301113 task_signals.go:204] [ 24( 1): 24( 1)] Signal 13, PID: 24, TID: 24, fault addr: 0x0: terminating thread group D0325 22:21:15.647274 301113 task_exit.go:204] [ 24( 1): 24( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:21:15.647388 301113 task_exit.go:361] [ 24( 1): 24( 1)] Init process terminating, killing namespace D0325 22:21:15.647412 301113 task_stop.go:138] [ 3561( 869): 3561( 869)] Leaving internal stop (*kernel.groupStop)(nil) D0325 22:21:15.647428 301113 task_signals.go:481] [ 3561( 869): 3561( 869)] No task notified of signal 9 D0325 22:21:15.647440 301113 task_exit.go:204] [ 24( 1): 24( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:21:15.647445 301113 task_signals.go:443] [ 19: 19] Discarding ignored signal 17 D0325 22:21:15.647463 301113 task_exit.go:204] [ 19: 19] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:21:15.647501 301113 task_signals.go:481] [ 24( 1): 24( 1)] No task notified of signal 9 D0325 22:21:15.647510 301113 task_signals.go:470] [ 1: 1] Notified of signal 17 D0325 22:21:15.647517 301113 task_exit.go:204] [ 19: 19] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:21:15.647521 301113 task_signals.go:458] [ 6: 6] Discarding duplicate signal 17 D0325 22:21:15.647750 301113 task_signals.go:458] [ 11910: 11910] Discarding duplicate signal 9 D0325 22:21:15.647768 301113 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 22:21:15.647774 301113 task_signals.go:458] [ 12070: 12070] Discarding duplicate signal 9 D0325 22:21:15.647779 301113 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 22:21:15.647784 301113 task_signals.go:458] [ 19: 19] Discarding duplicate signal 9 D0325 22:21:15.647789 301113 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 22:21:15.647794 301113 task_signals.go:458] [ 5910: 5910] Discarding duplicate signal 9 D0325 22:21:15.647798 301113 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 22:21:15.647805 301113 task_exit.go:204] [ 6: 8737] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:21:15.647810 301113 task_exit.go:204] [ 6: 8737] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:21:15.647816 301113 task_exit.go:204] [ 6: 6] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:21:15.647833 301113 task_signals.go:204] [ 3561( 869): 3561( 869)] Signal 9, PID: 3561, TID: 3561, fault addr: 0x0: terminating thread group D0325 22:21:15.647841 301113 task_exit.go:204] [ 3561( 869): 3561( 869)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:21:15.648337 301113 task_exit.go:361] [ 3561( 869): 3561( 869)] Init process terminating, killing namespace D0325 22:21:15.648352 301113 task_signals.go:458] [ 24( 1): 24( 1)] Discarding duplicate signal 9 D0325 22:21:15.648361 301113 task_exit.go:204] [ 3561( 869): 3561( 869)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:21:15.648366 301113 task_exit.go:204] [ 3561( 869): 3561( 869)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:21:15.648379 301113 task_exit.go:204] [ 5912( 1): 5912( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:21:15.648629 301113 task_exit.go:361] [ 5912( 1): 5912( 1)] Init process terminating, killing namespace D0325 22:21:15.648666 301113 task_exit.go:204] [ 5912( 1): 5912( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:21:15.648673 301113 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 22:21:15.648687 301113 loader.go:1259] updated processes (removal): map[{ci-gvisor-arm64-ptrace-1-1 0}:0x40003811d0] D0325 22:21:15.648706 301113 controller.go:523] containerManager.Wait, cid: ci-gvisor-arm64-ptrace-1-1, pid: 6, waitStatus: 0x200, err: D0325 22:21:15.648758 301113 urpc.go:568] urpc: successfully marshalled 38 bytes. D0325 22:21:15.649399 301113 task_exit.go:204] [ 12075( 1): 12075( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:21:15.649478 301113 task_exit.go:361] [ 12075( 1): 12075( 1)] Init process terminating, killing namespace D0325 22:21:15.649495 301113 task_signals.go:481] [ 13368( 471): 13368( 471)] No task notified of signal 9 D0325 22:21:15.649502 301113 task_signals.go:458] [ 13368( 471): 13368( 471)] Discarding duplicate signal 9 D0325 22:21:15.649508 301113 task_exit.go:204] [ 12075( 1): 12075( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:21:15.649514 301113 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 22:21:15.649549 301113 task_signals.go:204] [ 11911( 1): 11911( 1)] Signal 9, PID: 11911, TID: 11911, fault addr: 0x0: terminating thread group D0325 22:21:15.649575 301113 task_exit.go:204] [ 11911( 1): 11911( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:21:15.649673 301113 task_exit.go:361] [ 11911( 1): 11911( 1)] Init process terminating, killing namespace D0325 22:21:15.649685 301113 task_signals.go:470] [ 13324( 278): 13324( 278)] Notified of signal 9 D0325 22:21:15.649693 301113 task_signals.go:458] [ 13324( 278): 13324( 278)] Discarding duplicate signal 9 D0325 22:21:15.649698 301113 task_exit.go:204] [ 11911( 1): 11911( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:21:15.649704 301113 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 22:21:15.649887 301113 task_signals.go:204] [ 13324( 278): 13324( 278)] Signal 9, PID: 13324, TID: 13324, fault addr: 0x0: terminating thread group D0325 22:21:15.649908 301113 task_exit.go:204] [ 13324( 278): 13324( 278)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:21:15.649926 301113 task_exit.go:204] [ 13324( 278): 13324( 278)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:21:15.649944 301113 task_signals.go:204] [ 13324( 278): 13326( 279)] Signal 9, PID: 13324, TID: 13326, fault addr: 0x0: terminating thread group D0325 22:21:15.649950 301113 task_exit.go:204] [ 13324( 278): 13326( 279)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:21:15.649958 301113 task_exit.go:204] [ 13324( 278): 13326( 279)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:21:15.649961 301113 task_exit.go:204] [ 13324( 278): 13326( 279)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:21:15.649974 301113 task_signals.go:204] [ 13324( 278): 13330( 280)] Signal 9, PID: 13324, TID: 13330, fault addr: 0x0: terminating thread group D0325 22:21:15.649979 301113 task_exit.go:204] [ 13324( 278): 13330( 280)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:21:15.650434 301113 task_exit.go:361] [ 13324( 278): 13330( 280)] Init process terminating, killing namespace D0325 22:21:15.650457 301113 task_signals.go:458] [ 11911( 1): 11911( 1)] Discarding duplicate signal 9 D0325 22:21:15.650464 301113 task_exit.go:204] [ 13324( 278): 13330( 280)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:21:15.650469 301113 task_exit.go:204] [ 13324( 278): 13330( 280)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:21:15.650474 301113 task_exit.go:204] [ 13324( 278): 13324( 278)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:21:15.652011 301113 task_signals.go:179] [ 1: 1] Restarting syscall 98: interrupted by signal 17 D0325 22:21:15.652038 301113 task_signals.go:220] [ 1: 1] Signal 17: delivering to handler D0325 22:21:15.658464 301113 task_signals.go:204] [ 13368( 471): 13368( 471)] Signal 9, PID: 13368, TID: 13368, fault addr: 0x0: terminating thread group D0325 22:21:15.658512 301113 task_exit.go:204] [ 13368( 471): 13368( 471)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:21:15.659006 301113 task_exit.go:361] [ 13368( 471): 13368( 471)] Init process terminating, killing namespace D0325 22:21:15.659025 301113 task_signals.go:458] [ 12075( 1): 12075( 1)] Discarding duplicate signal 9 D0325 22:21:15.659033 301113 task_exit.go:204] [ 13368( 471): 13368( 471)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:21:15.659040 301113 task_exit.go:204] [ 13368( 471): 13368( 471)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:21:15.732210 301113 urpc.go:611] urpc: unmarshal success. D0325 22:21:15.737534 301113 urpc.go:568] urpc: successfully marshalled 58734 bytes. D0325 22:21:15.739080 301113 urpc.go:611] urpc: unmarshal success. D0325 22:21:15.739112 301113 controller.go:232] containerManager.Processes, cid: ci-gvisor-arm64-ptrace-1-1 D0325 22:21:15.739302 301113 urpc.go:568] urpc: successfully marshalled 2202 bytes. D0325 22:21:21.075336 301113 sampler.go:191] Time: Adjusting syscall overhead down to 7