panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x28 pc=0x5a6c84] goroutine 83 [running]: main.diffProgInfo(0x0, 0x634c8?) /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:432 +0x24 main.(*FuzzerTool).diffMaxSignal(0x70?, 0x4000393800?) /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:442 +0xb8 main.(*FuzzerTool).convertExecutionResult(0x0?, {{0x7a6e, {0x40011da000, 0x1bb24, 0x1bb24}, 0x0, 0x0, 0x0, 0x1, 0x0}, ...}) /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:386 +0x74 main.(*FuzzerTool).exchangeDataCall(0x40003d00f0, 0x2, {0x4000146000, 0x2, 0x691f00?}) /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:345 +0x314 main.(*FuzzerTool).exchangeDataWorker(0x40003d00f0) /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:380 +0x58 created by main.main in goroutine 1 /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:272 +0x10f8 D0325 22:27:01.625629 296096 task_signals.go:458] [ 65341: 65341] Discarding duplicate signal 9 D0325 22:27:01.625635 296096 task_signals.go:458] [ 4821: 4821] Discarding duplicate signal 9 D0325 22:27:01.625639 296096 task_exit.go:204] [ 6: 837] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.625642 296096 task_exit.go:204] [ 6: 837] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.625652 296096 task_signals.go:204] [ 6: 5047] Signal 9, PID: 6, TID: 5047, fault addr: 0x0: terminating thread group D0325 22:27:01.625658 296096 task_exit.go:204] [ 6: 5047] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.625665 296096 task_signals.go:458] [ 65341: 65341] Discarding duplicate signal 9 D0325 22:27:01.625669 296096 task_signals.go:458] [ 4821: 4821] Discarding duplicate signal 9 D0325 22:27:01.625673 296096 task_exit.go:204] [ 6: 5047] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.625676 296096 task_exit.go:204] [ 6: 5047] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.625685 296096 task_signals.go:204] [ 6: 14088] Signal 9, PID: 6, TID: 14088, fault addr: 0x0: terminating thread group D0325 22:27:01.625691 296096 task_exit.go:204] [ 6: 14088] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.625700 296096 task_signals.go:470] [ 53577: 53577] Notified of signal 9 D0325 22:27:01.625706 296096 task_signals.go:458] [ 65341: 65341] Discarding duplicate signal 9 D0325 22:27:01.625711 296096 task_signals.go:458] [ 4821: 4821] Discarding duplicate signal 9 D0325 22:27:01.625715 296096 task_exit.go:204] [ 6: 14088] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.625720 296096 task_exit.go:204] [ 6: 14088] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.625729 296096 task_signals.go:204] [ 6: 51307] Signal 9, PID: 6, TID: 51307, fault addr: 0x0: terminating thread group D0325 22:27:01.625735 296096 task_exit.go:204] [ 6: 51307] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.625824 296096 task_signals.go:204] [ 65341: 65341] Signal 9, PID: 65341, TID: 65341, fault addr: 0x0: terminating thread group D0325 22:27:01.625846 296096 task_exit.go:204] [ 65341: 65341] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.625868 296096 task_signals.go:204] [ 53577: 53577] Signal 9, PID: 53577, TID: 53577, fault addr: 0x0: terminating thread group D0325 22:27:01.625875 296096 task_exit.go:204] [ 53577: 53577] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.625914 296096 task_signals.go:470] [ 65342( 1): 65342( 1)] Notified of signal 9 D0325 22:27:01.625933 296096 task_exit.go:204] [ 65341: 65341] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.625940 296096 task_signals.go:481] [ 6: 6] No task notified of signal 17 D0325 22:27:01.625953 296096 task_signals.go:204] [ 4821: 4821] Signal 9, PID: 4821, TID: 4821, fault addr: 0x0: terminating thread group D0325 22:27:01.625959 296096 task_exit.go:204] [ 4821: 4821] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.626038 296096 task_signals.go:470] [ 4822( 1): 4822( 1)] Notified of signal 9 D0325 22:27:01.626084 296096 task_exit.go:204] [ 4821: 4821] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.626106 296096 task_signals.go:458] [ 6: 6] Discarding duplicate signal 17 D0325 22:27:01.626418 296096 task_signals.go:204] [ 4822( 1): 4822( 1)] Signal 9, PID: 4822, TID: 4822, fault addr: 0x0: terminating thread group D0325 22:27:01.626439 296096 task_exit.go:204] [ 4822( 1): 4822( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.626533 296096 task_signals.go:204] [ 65342( 1): 65342( 1)] Signal 9, PID: 65342, TID: 65342, fault addr: 0x0: terminating thread group D0325 22:27:01.626570 296096 task_exit.go:204] [ 65342( 1): 65342( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.626643 296096 task_exit.go:361] [ 65342( 1): 65342( 1)] Init process terminating, killing namespace D0325 22:27:01.626656 296096 task_signals.go:470] [ 5260(1318): 5260(1318)] Notified of signal 9 D0325 22:27:01.626691 296096 task_signals.go:458] [ 5260(1318): 5260(1318)] Discarding duplicate signal 9 D0325 22:27:01.626705 296096 task_exit.go:204] [ 65342( 1): 65342( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.626717 296096 task_signals.go:470] [ 1: 1] Notified of signal 17 D0325 22:27:01.626771 296096 task_signals.go:204] [ 5260(1318): 5260(1318)] Signal 9, PID: 5260, TID: 5260, fault addr: 0x0: terminating thread group D0325 22:27:01.626788 296096 task_exit.go:204] [ 5260(1318): 5260(1318)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.626821 296096 task_exit.go:204] [ 5260(1318): 5260(1318)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.626894 296096 task_signals.go:204] [ 5260(1318): 5261(1319)] Signal 9, PID: 5260, TID: 5261, fault addr: 0x0: terminating thread group D0325 22:27:01.626906 296096 task_exit.go:204] [ 5260(1318): 5261(1319)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.626922 296096 task_exit.go:204] [ 5260(1318): 5261(1319)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.626926 296096 task_exit.go:204] [ 5260(1318): 5261(1319)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.626943 296096 task_signals.go:204] [ 5260(1318): 5262(1320)] Signal 9, PID: 5260, TID: 5262, fault addr: 0x0: terminating thread group D0325 22:27:01.626951 296096 task_exit.go:204] [ 5260(1318): 5262(1320)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.626964 296096 task_exit.go:361] [ 4822( 1): 4822( 1)] Init process terminating, killing namespace D0325 22:27:01.626974 296096 task_exit.go:204] [ 4822( 1): 4822( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.626983 296096 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 22:27:01.627171 296096 task_signals.go:470] [ 53578( 1): 53578( 1)] Notified of signal 9 D0325 22:27:01.627189 296096 task_exit.go:204] [ 53577: 53577] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.627218 296096 task_signals.go:458] [ 6: 6] Discarding duplicate signal 17 D0325 22:27:01.627238 296096 task_signals.go:204] [ 53578( 1): 53578( 1)] Signal 9, PID: 53578, TID: 53578, fault addr: 0x0: terminating thread group D0325 22:27:01.627247 296096 task_exit.go:204] [ 53578( 1): 53578( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.627300 296096 task_exit.go:361] [ 53578( 1): 53578( 1)] Init process terminating, killing namespace D0325 22:27:01.627309 296096 task_signals.go:470] [ 5279(4534): 5279(4534)] Notified of signal 9 D0325 22:27:01.627327 296096 task_signals.go:458] [ 5279(4534): 5279(4534)] Discarding duplicate signal 9 D0325 22:27:01.627335 296096 task_exit.go:204] [ 53578( 1): 53578( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.627340 296096 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 22:27:01.627714 296096 task_signals.go:204] [ 5279(4534): 5280(4535)] Signal 9, PID: 5279, TID: 5280, fault addr: 0x0: terminating thread group D0325 22:27:01.627757 296096 task_exit.go:204] [ 5279(4534): 5280(4535)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.627813 296096 task_exit.go:204] [ 5279(4534): 5280(4535)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.627829 296096 task_exit.go:204] [ 5279(4534): 5280(4535)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.627847 296096 task_signals.go:204] [ 5279(4534): 5279(4534)] Signal 9, PID: 5279, TID: 5279, fault addr: 0x0: terminating thread group D0325 22:27:01.627967 296096 task_exit.go:204] [ 5279(4534): 5279(4534)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.628001 296096 task_signals.go:481] [ 53578( 1): 53578( 1)] No task notified of signal 29 D0325 22:27:01.628074 296096 task_signals.go:470] [ 3642: 3642] Notified of signal 9 D0325 22:27:01.628083 296096 task_signals.go:458] [ 53577: 53577] Discarding duplicate signal 9 D0325 22:27:01.628089 296096 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 22:27:01.628095 296096 task_signals.go:458] [ 65341: 65341] Discarding duplicate signal 9 D0325 22:27:01.628100 296096 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 22:27:01.628105 296096 task_signals.go:458] [ 4821: 4821] Discarding duplicate signal 9 D0325 22:27:01.628109 296096 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 22:27:01.628114 296096 task_exit.go:204] [ 6: 51307] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.628119 296096 task_exit.go:204] [ 6: 51307] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.628140 296096 task_exit.go:204] [ 6: 6] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.628232 296096 task_signals.go:458] [ 53578( 1): 53578( 1)] Discarding duplicate signal 29 D0325 22:27:01.628371 296096 task_signals.go:204] [ 3642: 3642] Signal 9, PID: 3642, TID: 3642, fault addr: 0x0: terminating thread group D0325 22:27:01.628383 296096 task_exit.go:204] [ 3642: 3642] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.628449 296096 task_signals.go:481] [ 3643( 1): 3643( 1)] No task notified of signal 9 D0325 22:27:01.628470 296096 task_exit.go:204] [ 3642: 3642] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.628475 296096 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 22:27:01.628486 296096 loader.go:1259] updated processes (removal): map[{ci-gvisor-arm64-ptrace-1-0 0}:0x40003b02d0] D0325 22:27:01.628504 296096 controller.go:523] containerManager.Wait, cid: ci-gvisor-arm64-ptrace-1-0, pid: 6, waitStatus: 0x200, err: D0325 22:27:01.628546 296096 urpc.go:568] urpc: successfully marshalled 38 bytes. D0325 22:27:01.629060 296096 task_signals.go:204] [ 3643( 1): 3643( 1)] Signal 9, PID: 3643, TID: 3643, fault addr: 0x0: terminating thread group D0325 22:27:01.629086 296096 task_exit.go:204] [ 3643( 1): 3643( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.629140 296096 task_exit.go:361] [ 3643( 1): 3643( 1)] Init process terminating, killing namespace D0325 22:27:01.629162 296096 task_signals.go:476] [ 5226( 374): 5227( 375)] Notified of group signal 9 D0325 22:27:01.629170 296096 task_stop.go:138] [ 4572( 215): 4572( 215)] Leaving internal stop (*kernel.groupStop)(nil) D0325 22:27:01.629178 296096 task_signals.go:481] [ 4572( 215): 4572( 215)] No task notified of signal 9 D0325 22:27:01.629186 296096 task_signals.go:458] [ 5226( 374): 5226( 374)] Discarding duplicate signal 9 D0325 22:27:01.629191 296096 task_exit.go:204] [ 3643( 1): 3643( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.629217 296096 task_signals.go:458] [ 1: 1] Discarding duplicate signal 17 D0325 22:27:01.632850 296096 task_signals.go:204] [ 5226( 374): 5228( 376)] Signal 9, PID: 5226, TID: 5228, fault addr: 0x0: terminating thread group D0325 22:27:01.632896 296096 task_exit.go:204] [ 5226( 374): 5228( 376)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.632938 296096 task_exit.go:204] [ 5226( 374): 5228( 376)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.632943 296096 task_exit.go:204] [ 5226( 374): 5228( 376)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.633339 296096 task_signals.go:204] [ 5226( 374): 5226( 374)] Signal 9, PID: 5226, TID: 5226, fault addr: 0x0: terminating thread group D0325 22:27:01.633407 296096 task_exit.go:204] [ 5226( 374): 5226( 374)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.633430 296096 task_exit.go:204] [ 5226( 374): 5226( 374)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.633476 296096 task_signals.go:204] [ 5226( 374): 5227( 375)] Signal 9, PID: 5226, TID: 5227, fault addr: 0x0: terminating thread group D0325 22:27:01.633482 296096 task_exit.go:204] [ 5226( 374): 5227( 375)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.633492 296096 task_exit.go:204] [ 5226( 374): 5227( 375)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.633495 296096 task_exit.go:204] [ 5226( 374): 5227( 375)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.633525 296096 task_signals.go:179] [ 1: 1] Restarting syscall 98: interrupted by signal 17 D0325 22:27:01.633539 296096 task_signals.go:220] [ 1: 1] Signal 17: delivering to handler D0325 22:27:01.633703 296096 task_exit.go:361] [ 5260(1318): 5262(1320)] Init process terminating, killing namespace D0325 22:27:01.633715 296096 task_signals.go:458] [ 65342( 1): 65342( 1)] Discarding duplicate signal 9 D0325 22:27:01.633731 296096 task_exit.go:204] [ 5260(1318): 5262(1320)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.633735 296096 task_exit.go:204] [ 5260(1318): 5262(1320)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.633747 296096 task_exit.go:204] [ 5260(1318): 5260(1318)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.633779 296096 task_signals.go:204] [ 5226( 374): 5230( 378)] Signal 9, PID: 5226, TID: 5230, fault addr: 0x0: terminating thread group D0325 22:27:01.633796 296096 task_exit.go:204] [ 5226( 374): 5230( 378)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.633817 296096 task_exit.go:204] [ 5226( 374): 5230( 378)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.633821 296096 task_exit.go:204] [ 5226( 374): 5230( 378)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.633831 296096 task_signals.go:204] [ 5226( 374): 5229( 377)] Signal 9, PID: 5226, TID: 5229, fault addr: 0x0: terminating thread group D0325 22:27:01.633837 296096 task_exit.go:204] [ 5226( 374): 5229( 377)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.633845 296096 task_exit.go:204] [ 5226( 374): 5229( 377)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.633849 296096 task_exit.go:204] [ 5226( 374): 5229( 377)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.633870 296096 task_signals.go:204] [ 5226( 374): 5231( 379)] Signal 9, PID: 5226, TID: 5231, fault addr: 0x0: terminating thread group D0325 22:27:01.633876 296096 task_exit.go:204] [ 5226( 374): 5231( 379)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.634027 296096 task_exit.go:361] [ 5226( 374): 5231( 379)] Init process terminating, killing namespace D0325 22:27:01.634034 296096 task_signals.go:458] [ 4572( 215): 4572( 215)] Discarding duplicate signal 9 D0325 22:27:01.634040 296096 task_signals.go:458] [ 3643( 1): 3643( 1)] Discarding duplicate signal 9 D0325 22:27:01.634058 296096 task_exit.go:204] [ 5226( 374): 5231( 379)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.634062 296096 task_exit.go:204] [ 5226( 374): 5231( 379)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.634066 296096 task_exit.go:204] [ 5226( 374): 5226( 374)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.634086 296096 task_signals.go:204] [ 4572( 215): 4572( 215)] Signal 9, PID: 4572, TID: 4572, fault addr: 0x0: terminating thread group D0325 22:27:01.634112 296096 task_exit.go:204] [ 4572( 215): 4572( 215)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:27:01.634376 296096 task_exit.go:361] [ 5279(4534): 5279(4534)] Init process terminating, killing namespace D0325 22:27:01.634394 296096 task_signals.go:458] [ 53578( 1): 53578( 1)] Discarding duplicate signal 9 D0325 22:27:01.634400 296096 task_exit.go:204] [ 5279(4534): 5279(4534)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.634408 296096 task_exit.go:204] [ 5279(4534): 5279(4534)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.634598 296096 task_exit.go:361] [ 4572( 215): 4572( 215)] Init process terminating, killing namespace D0325 22:27:01.634609 296096 task_signals.go:458] [ 3643( 1): 3643( 1)] Discarding duplicate signal 9 D0325 22:27:01.634615 296096 task_exit.go:204] [ 4572( 215): 4572( 215)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:27:01.634635 296096 task_exit.go:204] [ 4572( 215): 4572( 215)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:27:01.630403 296158 urpc.go:611] urpc: unmarshal success. I0325 22:27:01.630512 296158 main.go:226] Exiting with status: 512 D0325 22:27:01.706397 296096 urpc.go:611] urpc: unmarshal success. D0325 22:27:01.709703 296096 urpc.go:568] urpc: successfully marshalled 113078 bytes. D0325 22:27:01.771015 296096 urpc.go:611] urpc: unmarshal success. D0325 22:27:01.771064 296096 controller.go:232] containerManager.Processes, cid: ci-gvisor-arm64-ptrace-1-0 D0325 22:27:01.771369 296096 urpc.go:568] urpc: successfully marshalled 6299 bytes.