panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x28 pc=0xa00d4a] goroutine 128 [running]: main.diffProgInfo(0x0, 0x7fa6beace7a8?) D0325 22:17:08.233172 306200 task_signals.go:470] [ 6: 3889] Notified of signal 23 D0325 22:17:08.233287 306200 task_signals.go:220] [ 6: 3889] Signal 23: delivering to handler D0325 22:17:08.235284 306200 task_signals.go:470] [ 6: 3889] Notified of signal 23 /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:432 +0x2a D0325 22:17:08.235532 306200 task_signals.go:220] [ 6: 3889] Signal 23: delivering to handler D0325 22:17:08.237517 306200 task_signals.go:470] [ 6: 3889] Notified of signal 23 D0325 22:17:08.237579 306200 task_signals.go:220] [ 6: 3889] Signal 23: delivering to handler main.(*FuzzerTool).diffMaxSignal(0xb303a0?, 0xc0005f4401?) D0325 22:17:08.239736 306200 task_signals.go:470] [ 6: 3889] Notified of signal 23 /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:442 +0x97 D0325 22:17:08.239858 306200 task_signals.go:220] [ 6: 3889] Signal 23: delivering to handler D0325 22:17:08.241237 306200 task_signals.go:470] [ 6: 3889] Notified of signal 23 D0325 22:17:08.241417 306200 task_signals.go:220] [ 6: 3889] Signal 23: delivering to handler D0325 22:17:08.243516 306200 task_signals.go:470] [ 6: 3889] Notified of signal 23 D0325 22:17:08.243563 306200 task_signals.go:220] [ 6: 3889] Signal 23: delivering to handler D0325 22:17:08.247094 306200 task_signals.go:470] [ 6: 3889] Notified of signal 23 D0325 22:17:08.247144 306200 task_signals.go:220] [ 6: 3889] Signal 23: delivering to handler main.(*FuzzerTool).convertExecutionResult(0x0?, {{0x7a5f, {0xc000968000, 0x17a77, 0x17a77}, 0x0, 0x0, 0x0, 0x1, 0x0}, ...}) /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:386 +0x46 main.(*FuzzerTool).exchangeDataCall(0xc00053a000, 0x1, {0xc0007eff78, 0x1, 0x0?}) D0325 22:17:08.253072 306200 task_signals.go:470] [ 6: 3889] Notified of signal 23 D0325 22:17:08.253314 306200 task_signals.go:220] [ 6: 3889] Signal 23: delivering to handler /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:345 +0x325 main.(*FuzzerTool).exchangeDataWorker(0xc00053a000) /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:380 +0x79 created by main.main in goroutine 1 /syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/fuzzer.go:272 +0x143c D0325 22:17:08.260233 306200 task_exit.go:204] [ 6: 3889] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.260320 306200 task_signals.go:204] [ 6: 13] Signal 9, PID: 6, TID: 13, fault addr: 0x0: terminating thread group D0325 22:17:08.260307 306200 task_signals.go:204] [ 6: 1420] Signal 9, PID: 6, TID: 1420, fault addr: 0x0: terminating thread group D0325 22:17:08.260309 306200 task_signals.go:204] [ 6: 14] Signal 9, PID: 6, TID: 14, fault addr: 0x0: terminating thread group D0325 22:17:08.260341 306200 task_signals.go:204] [ 6: 170] Signal 9, PID: 6, TID: 170, fault addr: 0x0: terminating thread group D0325 22:17:08.260351 306200 task_signals.go:204] [ 6: 15] Signal 9, PID: 6, TID: 15, fault addr: 0x0: terminating thread group D0325 22:17:08.260369 306200 task_signals.go:204] [ 6: 10] Signal 9, PID: 6, TID: 10, fault addr: 0x0: terminating thread group D0325 22:17:08.260374 306200 task_signals.go:204] [ 6: 16] Signal 9, PID: 6, TID: 16, fault addr: 0x0: terminating thread group D0325 22:17:08.260406 306200 task_signals.go:204] [ 6: 2218] Signal 9, PID: 6, TID: 2218, fault addr: 0x0: terminating thread group D0325 22:17:08.260414 306200 task_signals.go:204] [ 6: 12] Signal 9, PID: 6, TID: 12, fault addr: 0x0: terminating thread group D0325 22:17:08.260413 306200 task_signals.go:204] [ 6: 11] Signal 9, PID: 6, TID: 11, fault addr: 0x0: terminating thread group D0325 22:17:08.260413 306200 task_signals.go:204] [ 6: 7] Signal 9, PID: 6, TID: 7, fault addr: 0x0: terminating thread group D0325 22:17:08.260425 306200 task_signals.go:204] [ 6: 8] Signal 9, PID: 6, TID: 8, fault addr: 0x0: terminating thread group D0325 22:17:08.260428 306200 task_signals.go:204] [ 6: 462] Signal 9, PID: 6, TID: 462, fault addr: 0x0: terminating thread group D0325 22:17:08.260437 306200 task_exit.go:204] [ 6: 16] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.260444 306200 task_signals.go:204] [ 6: 17] Signal 9, PID: 6, TID: 17, fault addr: 0x0: terminating thread group D0325 22:17:08.260511 306200 task_signals.go:204] [ 6: 6] Signal 9, PID: 6, TID: 6, fault addr: 0x0: terminating thread group D0325 22:17:08.260501 306200 task_signals.go:204] [ 6: 3312] Signal 9, PID: 6, TID: 3312, fault addr: 0x0: terminating thread group D0325 22:17:08.260481 306200 task_signals.go:204] [ 6: 10594] Signal 9, PID: 6, TID: 10594, fault addr: 0x0: terminating thread group D0325 22:17:08.260534 306200 task_signals.go:204] [ 6: 18] Signal 9, PID: 6, TID: 18, fault addr: 0x0: terminating thread group D0325 22:17:08.260551 306200 task_signals.go:204] [ 6: 9] Signal 9, PID: 6, TID: 9, fault addr: 0x0: terminating thread group D0325 22:17:08.260566 306200 task_exit.go:204] [ 6: 17] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.260632 306200 task_signals.go:204] [ 6: 47527] Signal 9, PID: 6, TID: 47527, fault addr: 0x0: terminating thread group D0325 22:17:08.260692 306200 task_exit.go:204] [ 6: 17] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.260718 306200 task_exit.go:204] [ 6: 17] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.260737 306200 task_exit.go:204] [ 6: 3889] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.260756 306200 task_exit.go:204] [ 6: 3889] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.260779 306200 task_exit.go:204] [ 6: 16] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.260796 306200 task_exit.go:204] [ 6: 16] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.260811 306200 task_exit.go:204] [ 6: 14] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.260838 306200 task_exit.go:204] [ 6: 14] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.260854 306200 task_exit.go:204] [ 6: 14] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.260868 306200 task_exit.go:204] [ 6: 1420] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.260912 306200 task_signals.go:470] [ 4000: 4000] Notified of signal 9 D0325 22:17:08.260935 306200 task_exit.go:204] [ 6: 1420] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.260941 306200 task_exit.go:204] [ 6: 1420] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.260989 306200 task_exit.go:204] [ 6: 170] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.260993 306200 task_signals.go:204] [ 4000: 4000] Signal 9, PID: 4000, TID: 4000, fault addr: 0x0: terminating thread group D0325 22:17:08.261004 306200 task_exit.go:204] [ 6: 170] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.261041 306200 task_exit.go:204] [ 6: 170] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.261070 306200 task_exit.go:204] [ 6: 15] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261113 306200 task_exit.go:204] [ 6: 15] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.261131 306200 task_exit.go:204] [ 6: 15] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.261146 306200 task_exit.go:204] [ 6: 10] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261170 306200 task_exit.go:204] [ 6: 10] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.261185 306200 task_exit.go:204] [ 6: 10] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.261247 306200 task_exit.go:204] [ 6: 13] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261329 306200 task_exit.go:204] [ 6: 13] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.261340 306200 task_exit.go:204] [ 6: 13] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.261407 306200 task_exit.go:204] [ 6: 2218] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261451 306200 task_exit.go:204] [ 6: 2218] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.261458 306200 task_exit.go:204] [ 6: 2218] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.261471 306200 task_exit.go:204] [ 6: 12] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261486 306200 task_exit.go:204] [ 6: 12] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.261503 306200 task_exit.go:204] [ 6: 12] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.261523 306200 task_exit.go:204] [ 6: 11] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261556 306200 task_exit.go:204] [ 6: 11] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.261562 306200 task_exit.go:204] [ 6: 11] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.261582 306200 task_exit.go:204] [ 6: 7] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261607 306200 task_exit.go:204] [ 6: 7] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.261624 306200 task_exit.go:204] [ 6: 7] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.261640 306200 task_exit.go:204] [ 6: 8] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261667 306200 task_exit.go:204] [ 6: 8] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.261684 306200 task_exit.go:204] [ 6: 8] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.261694 306200 task_exit.go:204] [ 6: 462] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261704 306200 task_exit.go:204] [ 6: 3312] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261722 306200 task_exit.go:204] [ 6: 6] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261732 306200 task_exit.go:204] [ 6: 10594] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261752 306200 task_exit.go:204] [ 6: 18] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261772 306200 task_exit.go:204] [ 6: 9] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261784 306200 task_exit.go:204] [ 6: 47527] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261810 306200 task_exit.go:204] [ 4000: 4000] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261873 306200 task_exit.go:204] [ 4878( 878): 4878( 878)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.261989 306200 task_exit.go:204] [ 4878( 878): 4878( 878)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.262023 306200 task_signals.go:204] [ 4878( 878): 4879( 879)] Signal 9, PID: 4878, TID: 4879, fault addr: 0x0: terminating thread group D0325 22:17:08.262059 306200 task_signals.go:458] [ 4000: 4000] Discarding duplicate signal 9 D0325 22:17:08.262080 306200 task_exit.go:204] [ 6: 6] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.262103 306200 task_exit.go:204] [ 6: 10594] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.262117 306200 task_exit.go:204] [ 6: 10594] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.262131 306200 task_exit.go:204] [ 6: 462] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.262144 306200 task_exit.go:204] [ 6: 462] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.262168 306200 task_exit.go:204] [ 6: 3312] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.262182 306200 task_exit.go:204] [ 6: 3312] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.262206 306200 task_exit.go:204] [ 6: 9] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.262251 306200 task_exit.go:204] [ 6: 9] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.262286 306200 task_exit.go:204] [ 6: 18] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.262308 306200 task_exit.go:204] [ 6: 18] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.262327 306200 task_signals.go:470] [ 4001( 1): 4001( 1)] Notified of signal 9 D0325 22:17:08.262348 306200 task_exit.go:204] [ 4000: 4000] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.262356 306200 task_signals.go:470] [ 1: 1] Notified of signal 17 D0325 22:17:08.262386 306200 task_signals.go:204] [ 4001( 1): 4001( 1)] Signal 9, PID: 4001, TID: 4001, fault addr: 0x0: terminating thread group D0325 22:17:08.262404 306200 task_exit.go:204] [ 4001( 1): 4001( 1)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.262405 306200 task_signals.go:179] [ 1: 1] Restarting syscall 202: interrupted by signal 17 D0325 22:17:08.262442 306200 task_signals.go:220] [ 1: 1] Signal 17: delivering to handler D0325 22:17:08.262418 306200 task_exit.go:204] [ 4878( 878): 4879( 879)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.262694 306200 task_exit.go:361] [ 4001( 1): 4001( 1)] Init process terminating, killing namespace D0325 22:17:08.262751 306200 task_signals.go:481] [ 4878( 878): 4878( 878)] No task notified of signal 9 D0325 22:17:08.262773 306200 task_stop.go:138] [ 4851( 851): 4851( 851)] Leaving internal stop (*kernel.groupStop)(nil) D0325 22:17:08.262793 306200 task_signals.go:481] [ 4851( 851): 4851( 851)] No task notified of signal 9 D0325 22:17:08.262800 306200 task_signals.go:458] [ 4878( 878): 4878( 878)] Discarding duplicate signal 9 D0325 22:17:08.262837 306200 task_exit.go:204] [ 4001( 1): 4001( 1)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.262859 306200 task_signals.go:470] [ 1: 1] Notified of signal 17 D0325 22:17:08.262896 306200 task_signals.go:204] [ 4851( 851): 4851( 851)] Signal 9, PID: 4851, TID: 4851, fault addr: 0x0: terminating thread group D0325 22:17:08.262916 306200 task_exit.go:204] [ 4851( 851): 4851( 851)] Transitioning from exit state TaskExitNone to TaskExitInitiated D0325 22:17:08.262951 306200 task_exit.go:361] [ 4878( 878): 4879( 879)] Init process terminating, killing namespace D0325 22:17:08.262976 306200 task_signals.go:179] [ 1: 1] Restarting syscall 202: interrupted by signal 17 D0325 22:17:08.262986 306200 task_signals.go:458] [ 4851( 851): 4851( 851)] Discarding duplicate signal 9 D0325 22:17:08.262993 306200 task_signals.go:220] [ 1: 1] Signal 17: delivering to handler D0325 22:17:08.262997 306200 task_signals.go:458] [ 4001( 1): 4001( 1)] Discarding duplicate signal 9 D0325 22:17:08.263157 306200 task_exit.go:204] [ 4878( 878): 4879( 879)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.263180 306200 task_exit.go:204] [ 4878( 878): 4879( 879)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.263191 306200 task_exit.go:204] [ 4878( 878): 4878( 878)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.265950 306200 task_exit.go:204] [ 6: 47527] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.265994 306200 task_exit.go:204] [ 6: 47527] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.266013 306200 task_exit.go:204] [ 6: 6] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.266054 306200 loader.go:1259] updated processes (removal): map[{ci-gvisor-ptrace-3-cover-1 0}:0xc0007d0c60] D0325 22:17:08.266102 306200 controller.go:523] containerManager.Wait, cid: ci-gvisor-ptrace-3-cover-1, pid: 6, waitStatus: 0x200, err: D0325 22:17:08.266181 306200 urpc.go:568] urpc: successfully marshalled 38 bytes. D0325 22:17:08.266200 306200 task_exit.go:361] [ 4851( 851): 4851( 851)] Init process terminating, killing namespace D0325 22:17:08.266286 306200 task_signals.go:458] [ 4001( 1): 4001( 1)] Discarding duplicate signal 9 D0325 22:17:08.266318 306200 task_exit.go:204] [ 4851( 851): 4851( 851)] Transitioning from exit state TaskExitInitiated to TaskExitZombie D0325 22:17:08.266328 306200 task_exit.go:204] [ 4851( 851): 4851( 851)] Transitioning from exit state TaskExitZombie to TaskExitDead D0325 22:17:08.266294 306282 urpc.go:611] urpc: unmarshal success. I0325 22:17:08.266425 306282 main.go:226] Exiting with status: 512 D0325 22:17:08.581737 306200 urpc.go:611] urpc: unmarshal success. D0325 22:17:08.582959 306200 urpc.go:568] urpc: successfully marshalled 26601 bytes. D0325 22:17:08.584098 306200 urpc.go:611] urpc: unmarshal success. D0325 22:17:08.584151 306200 controller.go:232] containerManager.Processes, cid: ci-gvisor-ptrace-3-cover-1 D0325 22:17:08.584524 306200 urpc.go:568] urpc: successfully marshalled 6310 bytes. I0325 22:17:16.776947 306200 watchdog.go:295] Watchdog starting loop, tasks: 58, discount: 0s