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?, {{0x76cc, {0x4001752000, 0x1fc44, 0x1fc44}, 0x0, 0x0, 0x0, 0x1, 0x0}, ...}) /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:386 +0x74 main.(*FuzzerTool).exchangeDataCall(0x4000458000, 0x1, {0x40010b9a58, 0x1, 0x691f00?}) /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 D0326 00:48:43.014027 357858 task_exit.go:204] [ 7: 324] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.014105 357858 task_signals.go:470] [ 679: 679] Notified of signal 9 D0326 00:48:43.014123 357858 task_signals.go:458] [ 62569: 62569] Discarding duplicate signal 9 D0326 00:48:43.014134 357858 task_signals.go:458] [ 59775: 59775] Discarding duplicate signal 9 D0326 00:48:43.014139 357858 task_signals.go:458] [ 63578: 63578] Discarding duplicate signal 9 D0326 00:48:43.014146 357858 task_exit.go:204] [ 7: 324] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.014151 357858 task_exit.go:204] [ 7: 324] Transitioning from exit state TaskExitZombie to TaskExitDead D0326 00:48:43.014169 357858 task_exit.go:204] [ 59775: 59775] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.014383 357858 task_exit.go:204] [ 1285(1830): 1285(1830)] Transitioning from exit state TaskExitZombie to TaskExitDead D0326 00:48:43.016051 357858 task_exit.go:204] [ 7: 557] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.016076 357858 task_exit.go:204] [ 7: 557] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.016082 357858 task_exit.go:204] [ 7: 557] Transitioning from exit state TaskExitZombie to TaskExitDead D0326 00:48:43.016105 357858 task_signals.go:204] [ 679: 679] Signal 9, PID: 679, TID: 679, fault addr: 0x0: terminating thread group D0326 00:48:43.016116 357858 task_exit.go:204] [ 679: 679] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.016443 357858 task_signals.go:481] [ 681( 1): 681( 1)] No task notified of signal 9 D0326 00:48:43.016458 357858 task_exit.go:204] [ 679: 679] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.016466 357858 task_signals.go:481] [ 7: 7] No task notified of signal 17 D0326 00:48:43.016486 357858 task_exit.go:204] [ 62569: 62569] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.018367 357858 task_exit.go:204] [ 1281( 975): 1288( 976)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.018411 357858 task_exit.go:204] [ 1281( 975): 1288( 976)] Transitioning from exit state TaskExitZombie to TaskExitDead D0326 00:48:43.018421 357858 task_signals.go:443] [ 62571( 1): 62571( 1)] Discarding ignored signal 17 D0326 00:48:43.018515 357858 task_exit.go:204] [ 1281( 975): 1281( 975)] Transitioning from exit state TaskExitZombie to TaskExitDead D0326 00:48:43.018555 357858 task_exit.go:204] [ 7: 3443] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.018582 357858 task_exit.go:204] [ 7: 3443] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.018586 357858 task_exit.go:204] [ 7: 3443] Transitioning from exit state TaskExitZombie to TaskExitDead D0326 00:48:43.018598 357858 task_exit.go:204] [ 7: 4016] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.018621 357858 task_exit.go:204] [ 7: 4016] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.018625 357858 task_exit.go:204] [ 7: 4016] Transitioning from exit state TaskExitZombie to TaskExitDead D0326 00:48:43.018634 357858 task_exit.go:204] [ 7: 6078] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.018642 357858 task_exit.go:204] [ 7: 6078] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.018646 357858 task_exit.go:204] [ 7: 6078] Transitioning from exit state TaskExitZombie to TaskExitDead D0326 00:48:43.018653 357858 task_exit.go:204] [ 7: 325] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.018663 357858 task_signals.go:458] [ 679: 679] Discarding duplicate signal 9 D0326 00:48:43.018670 357858 task_signals.go:458] [ 62569: 62569] Discarding duplicate signal 9 D0326 00:48:43.018675 357858 task_signals.go:458] [ 59775: 59775] Discarding duplicate signal 9 D0326 00:48:43.018680 357858 task_signals.go:458] [ 63578: 63578] Discarding duplicate signal 9 D0326 00:48:43.018683 357858 task_exit.go:204] [ 7: 325] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.018687 357858 task_exit.go:204] [ 7: 325] Transitioning from exit state TaskExitZombie to TaskExitDead D0326 00:48:43.018696 357858 task_exit.go:204] [ 7: 2671] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.019810 357858 task_signals.go:481] [ 59776( 1): 59776( 1)] No task notified of signal 9 D0326 00:48:43.019835 357858 task_exit.go:204] [ 59775: 59775] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.019844 357858 task_signals.go:458] [ 7: 7] Discarding duplicate signal 17 D0326 00:48:43.029605 357858 task_signals.go:481] [ 62571( 1): 62571( 1)] No task notified of signal 9 D0326 00:48:43.029641 357858 task_exit.go:204] [ 62569: 62569] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.029652 357858 task_signals.go:458] [ 7: 7] Discarding duplicate signal 17 D0326 00:48:43.030639 357858 task_signals.go:204] [ 681( 1): 681( 1)] Signal 9, PID: 681, TID: 681, fault addr: 0x0: terminating thread group D0326 00:48:43.030660 357858 task_exit.go:204] [ 681( 1): 681( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.034246 357858 task_signals.go:204] [ 59776( 1): 59776( 1)] Signal 9, PID: 59776, TID: 59776, fault addr: 0x0: terminating thread group D0326 00:48:43.034276 357858 task_exit.go:204] [ 59776( 1): 59776( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.035771 357858 task_exit.go:361] [ 59776( 1): 59776( 1)] Init process terminating, killing namespace D0326 00:48:43.035802 357858 task_signals.go:470] [ 63793(1020): 63793(1020)] Notified of signal 9 D0326 00:48:43.035813 357858 task_stop.go:138] [ 768(1700): 768(1700)] Leaving internal stop (*kernel.groupStop)(nil) D0326 00:48:43.035824 357858 task_signals.go:481] [ 768(1700): 768(1700)] No task notified of signal 9 D0326 00:48:43.035835 357858 task_exit.go:204] [ 59776( 1): 59776( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.035847 357858 task_signals.go:470] [ 1: 1] Notified of signal 17 D0326 00:48:43.035875 357858 task_signals.go:204] [ 63793(1020): 63793(1020)] Signal 9, PID: 63793, TID: 63793, fault addr: 0x0: terminating thread group D0326 00:48:43.035884 357858 task_exit.go:204] [ 63793(1020): 63793(1020)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.036368 357858 task_signals.go:204] [ 768(1700): 768(1700)] Signal 9, PID: 768, TID: 768, fault addr: 0x0: terminating thread group D0326 00:48:43.036393 357858 task_exit.go:204] [ 768(1700): 768(1700)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.038276 357858 task_signals.go:204] [ 62571( 1): 62571( 1)] Signal 9, PID: 62571, TID: 62571, fault addr: 0x0: terminating thread group D0326 00:48:43.038316 357858 task_exit.go:204] [ 62571( 1): 62571( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.038390 357858 task_signals.go:179] [ 1: 1] Restarting syscall 98: interrupted by signal 17 D0326 00:48:43.038416 357858 task_signals.go:220] [ 1: 1] Signal 17: delivering to handler D0326 00:48:43.038485 357858 task_exit.go:361] [ 63793(1020): 63793(1020)] Init process terminating, killing namespace D0326 00:48:43.038517 357858 task_signals.go:458] [ 59776( 1): 59776( 1)] Discarding duplicate signal 9 D0326 00:48:43.038526 357858 task_signals.go:458] [ 768(1700): 768(1700)] Discarding duplicate signal 9 D0326 00:48:43.038532 357858 task_exit.go:204] [ 63793(1020): 63793(1020)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.038538 357858 task_exit.go:204] [ 63793(1020): 63793(1020)] Transitioning from exit state TaskExitZombie to TaskExitDead D0326 00:48:43.038905 357858 task_exit.go:361] [ 62571( 1): 62571( 1)] Init process terminating, killing namespace D0326 00:48:43.038923 357858 task_exit.go:204] [ 62571( 1): 62571( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.038953 357858 task_signals.go:476] [ 1: 2] Notified of group signal 17 D0326 00:48:43.039047 357858 task_signals.go:176] [ 1: 2] Not restarting syscall 98 after error interrupted by signal: interrupted by signal 17 D0326 00:48:43.039056 357858 task_signals.go:220] [ 1: 2] Signal 17: delivering to handler D0326 00:48:43.042325 357858 task_signals.go:481] [ 63580( 1): 63580( 1)] No task notified of signal 9 D0326 00:48:43.042358 357858 task_exit.go:204] [ 63578: 63578] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.042368 357858 task_signals.go:458] [ 7: 7] Discarding duplicate signal 17 D0326 00:48:43.046331 357858 task_exit.go:361] [ 681( 1): 681( 1)] Init process terminating, killing namespace D0326 00:48:43.046360 357858 task_signals.go:481] [ 1289( 161): 1289( 161)] No task notified of signal 9 D0326 00:48:43.046369 357858 task_exit.go:204] [ 681( 1): 681( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.046379 357858 task_signals.go:470] [ 1: 1] Notified of signal 17 D0326 00:48:43.046852 357858 task_signals.go:179] [ 1: 1] Restarting syscall 98: interrupted by signal 17 D0326 00:48:43.046863 357858 task_signals.go:220] [ 1: 1] Signal 17: delivering to handler D0326 00:48:43.049038 357858 task_signals.go:458] [ 679: 679] Discarding duplicate signal 9 D0326 00:48:43.049066 357858 task_signals.go:470] [ 1: 1] Notified of signal 17 D0326 00:48:43.049075 357858 task_signals.go:458] [ 62569: 62569] Discarding duplicate signal 9 D0326 00:48:43.049080 357858 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0326 00:48:43.049086 357858 task_signals.go:458] [ 59775: 59775] Discarding duplicate signal 9 D0326 00:48:43.049091 357858 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0326 00:48:43.049096 357858 task_signals.go:458] [ 63578: 63578] Discarding duplicate signal 9 D0326 00:48:43.049100 357858 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0326 00:48:43.049106 357858 task_exit.go:204] [ 7: 2671] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.049112 357858 task_exit.go:204] [ 7: 2671] Transitioning from exit state TaskExitZombie to TaskExitDead D0326 00:48:43.049117 357858 task_exit.go:204] [ 7: 7] Transitioning from exit state TaskExitZombie to TaskExitDead D0326 00:48:43.052097 357903 urpc.go:611] urpc: unmarshal success. I0326 00:48:43.052149 357903 main.go:226] Exiting with status: 512 D0326 00:48:43.050261 357858 task_signals.go:204] [ 63580( 1): 63580( 1)] Signal 9, PID: 63580, TID: 63580, fault addr: 0x0: terminating thread group D0326 00:48:43.050303 357858 task_exit.go:204] [ 63580( 1): 63580( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.050916 357858 task_exit.go:361] [ 768(1700): 768(1700)] Init process terminating, killing namespace D0326 00:48:43.050939 357858 task_signals.go:458] [ 59776( 1): 59776( 1)] Discarding duplicate signal 9 D0326 00:48:43.050946 357858 task_exit.go:204] [ 768(1700): 768(1700)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.050951 357858 task_exit.go:204] [ 768(1700): 768(1700)] Transitioning from exit state TaskExitZombie to TaskExitDead D0326 00:48:43.051042 357858 task_signals.go:179] [ 1: 1] Restarting syscall 98: interrupted by signal 17 D0326 00:48:43.051052 357858 task_signals.go:220] [ 1: 1] Signal 17: delivering to handler D0326 00:48:43.051893 357858 loader.go:1259] updated processes (removal): map[{ci-gvisor-arm64-systrap-1-1 0}:0x4000316810] D0326 00:48:43.051964 357858 controller.go:523] containerManager.Wait, cid: ci-gvisor-arm64-systrap-1-1, pid: 7, waitStatus: 0x200, err: D0326 00:48:43.057508 357858 task_signals.go:204] [ 1289( 161): 1289( 161)] Signal 9, PID: 1289, TID: 1289, fault addr: 0x0: terminating thread group D0326 00:48:43.057543 357858 task_exit.go:204] [ 1289( 161): 1289( 161)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.058001 357858 task_exit.go:361] [ 1289( 161): 1289( 161)] Init process terminating, killing namespace D0326 00:48:43.058028 357858 task_signals.go:458] [ 681( 1): 681( 1)] Discarding duplicate signal 9 D0326 00:48:43.058036 357858 task_exit.go:204] [ 1289( 161): 1289( 161)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.058042 357858 task_exit.go:204] [ 1289( 161): 1289( 161)] Transitioning from exit state TaskExitZombie to TaskExitDead D0326 00:48:43.060929 357858 task_exit.go:361] [ 63580( 1): 63580( 1)] Init process terminating, killing namespace D0326 00:48:43.060959 357858 task_signals.go:481] [ 1287( 796): 1287( 796)] No task notified of signal 9 D0326 00:48:43.060970 357858 task_signals.go:470] [ 65168( 385): 65168( 385)] Notified of signal 9 D0326 00:48:43.060976 357858 task_exit.go:204] [ 63580( 1): 63580( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.060985 357858 task_signals.go:470] [ 1: 1] Notified of signal 17 D0326 00:48:43.061013 357858 task_signals.go:204] [ 65168( 385): 65168( 385)] Signal 9, PID: 65168, TID: 65168, fault addr: 0x0: terminating thread group D0326 00:48:43.061023 357858 task_exit.go:204] [ 65168( 385): 65168( 385)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.061047 357858 task_signals.go:179] [ 1: 1] Restarting syscall 98: interrupted by signal 17 D0326 00:48:43.061053 357858 task_signals.go:220] [ 1: 1] Signal 17: delivering to handler D0326 00:48:43.061203 357858 task_signals.go:204] [ 1287( 796): 1287( 796)] Signal 9, PID: 1287, TID: 1287, fault addr: 0x0: terminating thread group D0326 00:48:43.061235 357858 task_exit.go:204] [ 1287( 796): 1287( 796)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0326 00:48:43.061308 357858 urpc.go:568] urpc: successfully marshalled 38 bytes. D0326 00:48:43.061484 357858 task_exit.go:361] [ 1287( 796): 1287( 796)] Init process terminating, killing namespace D0326 00:48:43.061504 357858 task_signals.go:458] [ 65168( 385): 65168( 385)] Discarding duplicate signal 9 D0326 00:48:43.061511 357858 task_signals.go:458] [ 63580( 1): 63580( 1)] Discarding duplicate signal 9 D0326 00:48:43.061516 357858 task_exit.go:204] [ 1287( 796): 1287( 796)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.061520 357858 task_exit.go:204] [ 1287( 796): 1287( 796)] Transitioning from exit state TaskExitZombie to TaskExitDead D0326 00:48:43.071008 357858 task_exit.go:361] [ 65168( 385): 65168( 385)] Init process terminating, killing namespace D0326 00:48:43.071039 357858 task_signals.go:458] [ 63580( 1): 63580( 1)] Discarding duplicate signal 9 D0326 00:48:43.071048 357858 task_exit.go:204] [ 65168( 385): 65168( 385)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0326 00:48:43.071055 357858 task_exit.go:204] [ 65168( 385): 65168( 385)] Transitioning from exit state TaskExitZombie to TaskExitDead D0326 00:48:43.114438 357858 urpc.go:611] urpc: unmarshal success. D0326 00:48:43.127870 357858 urpc.go:568] urpc: successfully marshalled 94966 bytes. D0326 00:48:43.156743 357858 urpc.go:611] urpc: unmarshal success. D0326 00:48:43.156787 357858 controller.go:232] containerManager.Processes, cid: ci-gvisor-arm64-systrap-1-1 D0326 00:48:43.157087 357858 urpc.go:568] urpc: successfully marshalled 6692 bytes. D0326 00:48:44.962258 357858 sampler.go:191] Time: Adjusting syscall overhead down to 7 D0326 00:48:45.958239 357858 sampler.go:191] Time: Adjusting syscall overhead down to 7 D0326 00:48:50.957036 357858 sampler.go:191] Time: Adjusting syscall overhead down to 7