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?, {{0x2640f, {0x4000abe000, 0x177af, 0x177af}, 0x0, 0x0, 0x0, 0x1, 0x0}, ...}) /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:386 +0x74 main.(*FuzzerTool).exchangeDataCall(0x40003d0000, 0x1, {0x400136ba58, 0x1, 0x691f00?}) /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:345 +0x314 main.(*FuzzerTool).exchangeDataWorker(0x40003d0000) /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 14:10:06.655093 14559 task_signals.go:204] [ 4385( 1): 4385( 1)] Signal 9, PID: 4385, TID: 4385, fault addr: 0x0: terminating thread group D0325 14:10:06.655127 14559 task_exit.go:204] [ 4385( 1): 4385( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 14:10:06.655422 14559 task_exit.go:361] [ 4385( 1): 4385( 1)] Init process terminating, killing namespace D0325 14:10:06.655443 14559 task_exit.go:204] [ 4385( 1): 4385( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 14:10:06.655451 14559 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 14:10:06.655794 14559 task_signals.go:179] [ 1: 1] Restarting syscall 98: interrupted by signal 17 D0325 14:10:06.655819 14559 task_signals.go:220] [ 1: 1] Signal 17: delivering to handler D0325 14:10:06.658494 14559 task_signals.go:204] [ 64790( 1): 64790( 1)] Signal 9, PID: 64790, TID: 64790, fault addr: 0x0: terminating thread group D0325 14:10:06.658530 14559 task_exit.go:204] [ 64790( 1): 64790( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 14:10:06.658607 14559 task_exit.go:361] [ 64790( 1): 64790( 1)] Init process terminating, killing namespace D0325 14:10:06.658624 14559 task_signals.go:470] [ 5578(1575): 5578(1575)] Notified of signal 9 D0325 14:10:06.658632 14559 task_signals.go:458] [ 5578(1575): 5578(1575)] Discarding duplicate signal 9 D0325 14:10:06.658638 14559 task_exit.go:204] [ 64790( 1): 64790( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 14:10:06.658644 14559 task_signals.go:470] [ 1: 1] Notified of signal 17 D0325 14:10:06.658660 14559 task_signals.go:204] [ 3083( 1): 3083( 1)] Signal 9, PID: 3083, TID: 3083, fault addr: 0x0: terminating thread group D0325 14:10:06.658667 14559 task_exit.go:204] [ 3083( 1): 3083( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 14:10:06.658706 14559 task_exit.go:361] [ 3083( 1): 3083( 1)] Init process terminating, killing namespace D0325 14:10:06.658721 14559 task_signals.go:470] [ 5630( 663): 5630( 663)] Notified of signal 9 D0325 14:10:06.658731 14559 task_signals.go:458] [ 5630( 663): 5630( 663)] Discarding duplicate signal 9 D0325 14:10:06.658737 14559 task_exit.go:204] [ 3083( 1): 3083( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 14:10:06.658740 14559 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 14:10:06.658751 14559 task_signals.go:204] [ 5630( 663): 5658( 666)] Signal 9, PID: 5630, TID: 5658, fault addr: 0x0: terminating thread group D0325 14:10:06.658757 14559 task_exit.go:204] [ 5630( 663): 5658( 666)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 14:10:06.658769 14559 task_exit.go:204] [ 5630( 663): 5658( 666)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 14:10:06.658773 14559 task_exit.go:204] [ 5630( 663): 5658( 666)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 14:10:06.662303 14559 task_signals.go:204] [ 5578(1575): 5590(1579)] Signal 9, PID: 5578, TID: 5590, fault addr: 0x0: terminating thread group D0325 14:10:06.662337 14559 task_signals.go:204] [ 5578(1575): 5591(1580)] Signal 9, PID: 5578, TID: 5591, fault addr: 0x0: terminating thread group D0325 14:10:06.662362 14559 task_exit.go:204] [ 5578(1575): 5590(1579)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 14:10:06.662370 14559 task_signals.go:179] [ 1: 1] Restarting syscall 98: interrupted by signal 17 D0325 14:10:06.662377 14559 task_signals.go:220] [ 1: 1] Signal 17: delivering to handler D0325 14:10:06.662399 14559 task_exit.go:204] [ 5578(1575): 5590(1579)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 14:10:06.662405 14559 task_exit.go:204] [ 5578(1575): 5590(1579)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 14:10:06.662440 14559 task_signals.go:204] [ 5630( 663): 5630( 663)] Signal 9, PID: 5630, TID: 5630, fault addr: 0x0: terminating thread group D0325 14:10:06.662468 14559 task_exit.go:204] [ 5630( 663): 5630( 663)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 14:10:06.662494 14559 task_exit.go:204] [ 5630( 663): 5630( 663)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 14:10:06.662514 14559 task_signals.go:204] [ 5630( 663): 5634( 664)] Signal 9, PID: 5630, TID: 5634, fault addr: 0x0: terminating thread group D0325 14:10:06.662520 14559 task_exit.go:204] [ 5630( 663): 5634( 664)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 14:10:06.662530 14559 task_exit.go:204] [ 5630( 663): 5634( 664)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 14:10:06.662534 14559 task_exit.go:204] [ 5630( 663): 5634( 664)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 14:10:06.662593 14559 task_signals.go:204] [ 5630( 663): 5640( 665)] Signal 9, PID: 5630, TID: 5640, fault addr: 0x0: terminating thread group D0325 14:10:06.662606 14559 task_exit.go:204] [ 5630( 663): 5640( 665)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 14:10:06.662632 14559 task_signals.go:204] [ 5578(1575): 5587(1576)] Signal 9, PID: 5578, TID: 5587, fault addr: 0x0: terminating thread group D0325 14:10:06.662649 14559 task_exit.go:204] [ 5578(1575): 5587(1576)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 14:10:06.662670 14559 task_exit.go:204] [ 5578(1575): 5587(1576)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 14:10:06.662704 14559 task_exit.go:204] [ 5578(1575): 5587(1576)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 14:10:06.662727 14559 task_signals.go:204] [ 5578(1575): 5578(1575)] Signal 9, PID: 5578, TID: 5578, fault addr: 0x0: terminating thread group D0325 14:10:06.662742 14559 task_exit.go:204] [ 5578(1575): 5591(1580)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 14:10:06.662753 14559 task_exit.go:204] [ 5578(1575): 5591(1580)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 14:10:06.662757 14559 task_exit.go:204] [ 5578(1575): 5591(1580)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 14:10:06.662772 14559 task_signals.go:204] [ 5578(1575): 5589(1578)] Signal 9, PID: 5578, TID: 5589, fault addr: 0x0: terminating thread group D0325 14:10:06.662780 14559 task_exit.go:204] [ 5578(1575): 5589(1578)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 14:10:06.662789 14559 task_signals.go:204] [ 5578(1575): 5588(1577)] Signal 9, PID: 5578, TID: 5588, fault addr: 0x0: terminating thread group D0325 14:10:06.662798 14559 task_exit.go:204] [ 5578(1575): 5589(1578)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 14:10:06.662802 14559 task_exit.go:204] [ 5578(1575): 5589(1578)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 14:10:06.662808 14559 task_exit.go:204] [ 5578(1575): 5588(1577)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 14:10:06.662820 14559 task_exit.go:204] [ 5578(1575): 5588(1577)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 14:10:06.662823 14559 task_exit.go:204] [ 5578(1575): 5588(1577)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 14:10:06.662906 14559 task_exit.go:204] [ 5578(1575): 5578(1575)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 14:10:06.662966 14559 task_exit.go:361] [ 5630( 663): 5640( 665)] Init process terminating, killing namespace D0325 14:10:06.662981 14559 task_signals.go:458] [ 3083( 1): 3083( 1)] Discarding duplicate signal 9 D0325 14:10:06.662988 14559 task_exit.go:204] [ 5630( 663): 5640( 665)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 14:10:06.662993 14559 task_exit.go:204] [ 5630( 663): 5640( 665)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 14:10:06.662998 14559 task_exit.go:204] [ 5630( 663): 5630( 663)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 14:10:06.663540 14559 task_exit.go:361] [ 5578(1575): 5578(1575)] Init process terminating, killing namespace D0325 14:10:06.663565 14559 task_signals.go:458] [ 64790( 1): 64790( 1)] Discarding duplicate signal 9 D0325 14:10:06.663572 14559 task_exit.go:204] [ 5578(1575): 5578(1575)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 14:10:06.663578 14559 task_exit.go:204] [ 5578(1575): 5578(1575)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 14:10:06.664676 14559 task_signals.go:458] [ 4383: 4383] Discarding duplicate signal 9 D0325 14:10:06.664703 14559 task_signals.go:476] [ 1: 2] Notified of group signal 17 D0325 14:10:06.664716 14559 task_signals.go:458] [ 3082: 3082] Discarding duplicate signal 9 D0325 14:10:06.664721 14559 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 14:10:06.664728 14559 task_signals.go:458] [ 64788: 64788] Discarding duplicate signal 9 D0325 14:10:06.664733 14559 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 14:10:06.664738 14559 task_signals.go:458] [ 2022: 2022] Discarding duplicate signal 9 D0325 14:10:06.664743 14559 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 14:10:06.664750 14559 task_exit.go:204] [ 7: 1570] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 14:10:06.664756 14559 task_exit.go:204] [ 7: 1570] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 14:10:06.664761 14559 task_exit.go:204] [ 7: 7] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 14:10:06.664787 14559 task_signals.go:176] [ 1: 2] Not restarting syscall 98 after error interrupted by signal: interrupted by signal 17 D0325 14:10:06.664795 14559 task_signals.go:220] [ 1: 2] Signal 17: delivering to handler D0325 14:10:06.665451 14559 loader.go:1259] updated processes (removal): map[{ci-gvisor-arm64-ptrace-1-0 0}:0x40002bdc20] D0325 14:10:06.665494 14559 controller.go:523] containerManager.Wait, cid: ci-gvisor-arm64-ptrace-1-0, pid: 7, waitStatus: 0x200, err: D0325 14:10:06.665563 14559 urpc.go:568] urpc: successfully marshalled 38 bytes. D0325 14:10:06.666317 14636 urpc.go:611] urpc: unmarshal success. I0325 14:10:06.666418 14636 main.go:226] Exiting with status: 512 D0325 14:10:06.735795 14559 urpc.go:611] urpc: unmarshal success. D0325 14:10:06.752008 14559 urpc.go:568] urpc: successfully marshalled 99762 bytes. D0325 14:10:06.776996 14559 urpc.go:611] urpc: unmarshal success. D0325 14:10:06.777047 14559 controller.go:232] containerManager.Processes, cid: ci-gvisor-arm64-ptrace-1-0 D0325 14:10:06.778108 14559 urpc.go:568] urpc: successfully marshalled 36268 bytes. D0325 14:10:06.926261 14559 sampler.go:191] Time: Adjusting syscall overhead down to 7 D0325 14:10:07.923149 14559 sampler.go:191] Time: Adjusting syscall overhead down to 7 D0325 14:10:13.923298 14559 sampler.go:191] Time: Adjusting syscall overhead down to 7 D0325 14:10:14.923224 14559 sampler.go:191] Time: Adjusting syscall overhead down to 7 D0325 14:10:15.923326 14559 sampler.go:191] Time: Adjusting syscall overhead down to 7