panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x2d8 pc=0xa4f7c7] goroutine 291 gp=0xc0004fd500 m=13 mp=0xc000708808 [running]: panic({0x10decc0?, 0x1f35130?}) GOROOT/src/runtime/panic.go:779 +0x158 fp=0xc000543680 sp=0xc0005435d0 pc=0x43cb78 runtime.panicmem(...) GOROOT/src/runtime/panic.go:261 runtime.sigpanic() GOROOT/src/runtime/signal_unix.go:881 +0x378 fp=0xc0005436e0 sp=0xc000543680 pc=0x456578 gvisor.dev/gvisor/pkg/tcpip/transport/tcp.(*endpoint).OnCorkOptionSet(0xc000447508, 0x40?) pkg/tcpip/transport/tcp/endpoint.go:1766 +0x67 fp=0xc000543720 sp=0xc0005436e0 pc=0xa4f7c7 gvisor.dev/gvisor/pkg/tcpip.(*SocketOptions).SetCorkOption(0x1509b28?, 0xf0?) pkg/tcpip/socketops.go:474 +0x24 fp=0xc000543740 sp=0xc000543720 pc=0x65abe4 gvisor.dev/gvisor/pkg/sentry/socket/netstack.setSockOptTCP(0x7f9dd45b9188?, {0x1509b28?, 0xc0003380f0?}, {0x7f9dd45b9188, 0xc000447508}, 0x3, {0xc0001ef3bc, 0x4, 0xc00054b008?}) pkg/sentry/socket/netstack/netstack.go:2015 +0x135 fp=0xc000543780 sp=0xc000543740 pc=0xac9635 gvisor.dev/gvisor/pkg/sentry/socket/netstack.SetSockOpt(0x835400?, {0x1509b28?, 0xc0003380f0?}, {0x7f9dd45b9188?, 0xc000447508?}, 0xc0001eea88?, 0xc000543870?, {0xc0001ef3bc, 0x4, 0x90}) pkg/sentry/socket/netstack/netstack.go:1765 +0xbc fp=0xc0005437d8 sp=0xc000543780 pc=0xac8a3c gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*sock).SetSockOpt(0xc0003380f0, 0xc0001eea88?, 0x6?, 0x3?, {0xc0001ef3bc, 0x4?, 0x90?}) pkg/sentry/socket/netstack/netstack.go:611 +0x235 fp=0xc000543880 sp=0xc0005437d8 pc=0xac33d5 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.SetSockOpt(0xc0001eea88, 0x0?, {{0x3}, {0x6}, {0x3}, {0x200000c0}, {0x4}, {0x7f4a77e67e78}}) pkg/sentry/syscalls/linux/sys_socket.go:551 +0x266 fp=0xc000543960 sp=0xc000543880 pc=0xb4daa6 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0001eea88, 0x36, {{0x3}, {0x6}, {0x3}, {0x200000c0}, {0x4}, {0x7f4a77e67e78}}) pkg/sentry/kernel/task_syscall.go:143 +0x673 fp=0xc000543ca0 sp=0xc000543960 pc=0x9c4b73 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0001eea88, 0x36, {{0x3}, {0x6}, {0x3}, {0x200000c0}, {0x4}, {0x7f4a77e67e78}}) pkg/sentry/kernel/task_syscall.go:323 +0x45 fp=0xc000543cf8 sp=0xc000543ca0 pc=0x9c5ce5 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0001eea88, 0x36, {{0x3}, {0x6}, {0x3}, {0x200000c0}, {0x4}, {0x7f4a77e67e78}}) pkg/sentry/kernel/task_syscall.go:283 +0x65 fp=0xc000543d48 sp=0xc000543cf8 pc=0x9c59e5 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0005a9ad0?) pkg/sentry/kernel/task_syscall.go:258 +0x2a5 fp=0xc000543e30 sp=0xc000543d48 pc=0x9c5765 gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc0003221b0?, 0xc0001eea88) pkg/sentry/kernel/task_run.go:263 +0xef7 fp=0xc000543f48 sp=0xc000543e30 pc=0x9b9c57 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0001eea88, 0x7) pkg/sentry/kernel/task_run.go:98 +0x1e2 fp=0xc000543fc0 sp=0xc000543f48 pc=0x9b86e2 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.gowrap1() pkg/sentry/kernel/task_start.go:390 +0x25 fp=0xc000543fe0 sp=0xc000543fc0 pc=0x9c3465 runtime.goexit({}) src/runtime/asm_amd64.s:1695 +0x1 fp=0xc000543fe8 sp=0xc000543fe0 pc=0x478c41 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 232 pkg/sentry/kernel/task_start.go:390 +0xe5