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 D0325 22:04:00.767169 271848 task_exit.go:204] [ 6: 1072] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.767239 271848 task_signals.go:204] [ 6: 10] Signal 9, PID: 6, TID: 10, fault addr: 0x0: terminating thread group D0325 22:04:00.767237 271848 task_signals.go:204] [ 6: 14] Signal 9, PID: 6, TID: 14, fault addr: 0x0: terminating thread group D0325 22:04:00.767263 271848 task_signals.go:204] [ 6: 12] Signal 9, PID: 6, TID: 12, fault addr: 0x0: terminating thread group D0325 22:04:00.767274 271848 task_signals.go:204] [ 6: 315] Signal 9, PID: 6, TID: 315, fault addr: 0x0: terminating thread group D0325 22:04:00.767267 271848 task_signals.go:204] [ 6: 9] Signal 9, PID: 6, TID: 9, fault addr: 0x0: terminating thread group D0325 22:04:00.767238 271848 task_signals.go:204] [ 6: 13] Signal 9, PID: 6, TID: 13, fault addr: 0x0: terminating thread group D0325 22:04:00.767285 271848 task_exit.go:204] [ 6: 1072] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.767294 271848 task_exit.go:204] [ 6: 1072] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:04:00.767311 271848 task_signals.go:204] [ 6: 1073] Signal 9, PID: 6, TID: 1073, fault addr: 0x0: terminating thread group D0325 22:04:00.767307 271848 task_signals.go:204] [ 6: 6] Signal 9, PID: 6, TID: 6, fault addr: 0x0: terminating thread group D0325 22:04:00.767319 271848 task_signals.go:204] [ 6: 32105] Signal 9, PID: 6, TID: 32105, fault addr: 0x0: terminating thread group D0325 22:04:00.767322 271848 task_signals.go:204] [ 6: 7] Signal 9, PID: 6, TID: 7, fault addr: 0x0: terminating thread group D0325 22:04:00.767333 271848 task_exit.go:204] [ 6: 1073] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.767349 271848 task_signals.go:204] [ 6: 11] Signal 9, PID: 6, TID: 11, fault addr: 0x0: terminating thread group D0325 22:04:00.767361 271848 task_signals.go:204] [ 6: 8] Signal 9, PID: 6, TID: 8, fault addr: 0x0: terminating thread group main.(*FuzzerTool).convertExecutionResult(0x64c720?, {{0x3bac, {0x4000a98000, 0xbe68, 0xbe68}, 0x0, 0x0, 0x0, 0x1, 0x0}, ...}) /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:386 +0x74 main.(*FuzzerTool).exchangeDataCall(0x4000458000, 0x1, {0x4001b8da58, 0x1, 0x40010f5908?}) /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 22:04:00.767378 271848 task_exit.go:204] [ 6: 1073] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.767382 271848 task_exit.go:204] [ 6: 1073] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:04:00.767392 271848 task_exit.go:204] [ 6: 10] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.767401 271848 task_exit.go:204] [ 6: 10] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.767405 271848 task_exit.go:204] [ 6: 10] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:04:00.767413 271848 task_exit.go:204] [ 6: 6] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.767422 271848 task_exit.go:204] [ 6: 6] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.767430 271848 task_exit.go:204] [ 6: 14] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.767439 271848 task_exit.go:204] [ 6: 14] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.767443 271848 task_exit.go:204] [ 6: 14] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:04:00.767449 271848 task_exit.go:204] [ 6: 12] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.767457 271848 task_exit.go:204] [ 6: 12] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.767461 271848 task_exit.go:204] [ 6: 12] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:04:00.767467 271848 task_exit.go:204] [ 6: 315] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.767504 271848 task_exit.go:204] [ 6: 315] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.767510 271848 task_exit.go:204] [ 6: 315] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:04:00.767519 271848 task_exit.go:204] [ 6: 9] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.767529 271848 task_exit.go:204] [ 6: 9] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.767533 271848 task_exit.go:204] [ 6: 9] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:04:00.767540 271848 task_exit.go:204] [ 6: 13] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.767548 271848 task_exit.go:204] [ 6: 13] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.767552 271848 task_exit.go:204] [ 6: 13] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:04:00.767559 271848 task_exit.go:204] [ 6: 32105] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.767567 271848 task_exit.go:204] [ 6: 32105] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.767571 271848 task_exit.go:204] [ 6: 32105] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:04:00.767579 271848 task_exit.go:204] [ 6: 7] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.767588 271848 task_exit.go:204] [ 6: 7] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.767591 271848 task_exit.go:204] [ 6: 7] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:04:00.767599 271848 task_exit.go:204] [ 6: 11] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.767607 271848 task_exit.go:204] [ 6: 11] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.767611 271848 task_exit.go:204] [ 6: 11] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:04:00.767617 271848 task_exit.go:204] [ 6: 8] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.769156 271848 task_signals.go:470] [ 37332: 37332] Notified of signal 9 D0325 22:04:00.769183 271848 task_exit.go:204] [ 6: 8] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.769195 271848 task_exit.go:204] [ 6: 8] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:04:00.769220 271848 task_exit.go:204] [ 6: 6] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:04:00.770496 271848 task_signals.go:470] [ 37333( 1): 37333( 1)] Notified of signal 13 D0325 22:04:00.770528 271848 task_signals.go:204] [ 37333( 1): 37333( 1)] Signal 13, PID: 37333, TID: 37333, fault addr: 0x0: terminating thread group D0325 22:04:00.770541 271848 task_exit.go:204] [ 37333( 1): 37333( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.770621 271848 task_exit.go:361] [ 37333( 1): 37333( 1)] Init process terminating, killing namespace D0325 22:04:00.770629 271848 task_stop.go:138] [ 41561(4229): 41561(4229)] Leaving internal stop (*kernel.groupStop)(nil) D0325 22:04:00.770640 271848 task_signals.go:481] [ 41561(4229): 41561(4229)] No task notified of signal 9 D0325 22:04:00.770647 271848 task_stop.go:138] [ 41009(3677): 41009(3677)] Leaving internal stop (*kernel.groupStop)(nil) D0325 22:04:00.770652 271848 task_signals.go:481] [ 41009(3677): 41009(3677)] No task notified of signal 9 D0325 22:04:00.770658 271848 task_stop.go:138] [ 37499( 167): 37499( 167)] Leaving internal stop (*kernel.groupStop)(nil) D0325 22:04:00.770664 271848 task_signals.go:481] [ 37499( 167): 37499( 167)] No task notified of signal 9 D0325 22:04:00.770671 271848 task_exit.go:204] [ 37333( 1): 37333( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.770678 271848 task_signals.go:443] [ 37332: 37332] Discarding ignored signal 17 D0325 22:04:00.773887 271848 task_signals.go:204] [ 41561(4229): 41561(4229)] Signal 9, PID: 41561, TID: 41561, fault addr: 0x0: terminating thread group D0325 22:04:00.773921 271848 task_exit.go:204] [ 41561(4229): 41561(4229)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.773913 271848 loader.go:1259] updated processes (removal): map[{ci-gvisor-arm64-ptrace-1-cover-0 0}:0x40007370e0] D0325 22:04:00.773943 271848 controller.go:523] containerManager.Wait, cid: ci-gvisor-arm64-ptrace-1-cover-0, pid: 6, waitStatus: 0x200, err: D0325 22:04:00.773980 271848 task_signals.go:204] [ 37499( 167): 37499( 167)] Signal 9, PID: 37499, TID: 37499, fault addr: 0x0: terminating thread group D0325 22:04:00.774001 271848 task_exit.go:361] [ 41561(4229): 41561(4229)] Init process terminating, killing namespace D0325 22:04:00.774008 271848 urpc.go:568] urpc: successfully marshalled 38 bytes. D0325 22:04:00.774011 271848 task_signals.go:481] [ 37333( 1): 37333( 1)] No task notified of signal 9 D0325 22:04:00.773889 271848 task_signals.go:204] [ 37332: 37332] Signal 9, PID: 37332, TID: 37332, fault addr: 0x0: terminating thread group D0325 22:04:00.774020 271848 task_signals.go:458] [ 41009(3677): 41009(3677)] Discarding duplicate signal 9 D0325 22:04:00.774031 271848 task_signals.go:458] [ 37499( 167): 37499( 167)] Discarding duplicate signal 9 D0325 22:04:00.774039 271848 task_exit.go:204] [ 41561(4229): 41561(4229)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.774044 271848 task_exit.go:204] [ 41561(4229): 41561(4229)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:04:00.774059 271848 task_signals.go:204] [ 41009(3677): 41009(3677)] Signal 9, PID: 41009, TID: 41009, fault addr: 0x0: terminating thread group D0325 22:04:00.774067 271848 task_exit.go:204] [ 41009(3677): 41009(3677)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.774108 271848 task_exit.go:361] [ 41009(3677): 41009(3677)] Init process terminating, killing namespace D0325 22:04:00.774113 271848 task_signals.go:458] [ 37333( 1): 37333( 1)] Discarding duplicate signal 9 D0325 22:04:00.774123 271848 task_signals.go:458] [ 37499( 167): 37499( 167)] Discarding duplicate signal 9 D0325 22:04:00.774128 271848 task_exit.go:204] [ 41009(3677): 41009(3677)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.774134 271848 task_exit.go:204] [ 41009(3677): 41009(3677)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:04:00.774144 271848 task_exit.go:204] [ 37499( 167): 37499( 167)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.774319 271918 urpc.go:611] urpc: unmarshal success. I0325 22:04:00.774395 271918 main.go:226] Exiting with status: 512 D0325 22:04:00.774673 271848 task_exit.go:361] [ 37499( 167): 37499( 167)] Init process terminating, killing namespace D0325 22:04:00.774704 271848 task_signals.go:458] [ 37333( 1): 37333( 1)] Discarding duplicate signal 9 D0325 22:04:00.774713 271848 task_exit.go:204] [ 37499( 167): 37499( 167)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.774719 271848 task_exit.go:204] [ 37499( 167): 37499( 167)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:04:00.774877 271848 task_exit.go:204] [ 37332: 37332] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:04:00.775133 271848 task_signals.go:458] [ 37333( 1): 37333( 1)] Discarding duplicate signal 9 D0325 22:04:00.775147 271848 task_signals.go:470] [ 1: 1] Notified of signal 17 D0325 22:04:00.775155 271848 task_exit.go:204] [ 37332: 37332] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:04:00.775159 271848 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 22:04:00.775491 271848 task_signals.go:179] [ 1: 1] Restarting syscall 98: interrupted by signal 17 D0325 22:04:00.775508 271848 task_signals.go:220] [ 1: 1] Signal 17: delivering to handler D0325 22:04:00.994068 271848 urpc.go:611] urpc: unmarshal success. D0325 22:04:00.999803 271848 urpc.go:568] urpc: successfully marshalled 203742 bytes. D0325 22:04:01.022106 271848 urpc.go:611] urpc: unmarshal success. D0325 22:04:01.022156 271848 controller.go:232] containerManager.Processes, cid: ci-gvisor-arm64-ptrace-1-cover-0 D0325 22:04:01.022423 271848 urpc.go:568] urpc: successfully marshalled 2243 bytes. D0325 22:04:06.218710 271848 sampler.go:191] Time: Adjusting syscall overhead down to 7 D0325 22:04:07.217886 271848 sampler.go:191] Time: Adjusting syscall overhead down to 7 D0325 22:04:08.217862 271848 sampler.go:191] Time: Adjusting syscall overhead down to 7 D0325 22:04:09.217870 271848 sampler.go:191] Time: Adjusting syscall overhead down to 7