panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x44 pc=0xb094d0]

goroutine 335320 [running]:
panic(0x1023640, 0x1a88090)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc088ff3818 sp=0xc088ff3760 pc=0x437030
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc088ff3848 sp=0xc088ff3818 pc=0x44de13
gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).writePacket(0xc000e3c000, 0x0, 0x0, 0x0, 0x11, 0x0)
	pkg/tcpip/network/ipv6/ipv6.go:648 +0x50 fp=0xc088ff5ea0 sp=0xc088ff3848 pc=0xb094d0
gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).WritePacket(0xc000e3c000, 0xc003033080, 0x0, 0x4000000011, 0xc008c440f0, 0x56)
	pkg/tcpip/network/ipv6/ipv6.go:644 +0x253 fp=0xc088ff62e0 sp=0xc088ff5ea0 pc=0xb092d3
gvisor.dev/gvisor/pkg/tcpip/stack.(*Route).WritePacket(0xc003033080, 0x0, 0x4000000011, 0xc008c440f0, 0x8)
	pkg/tcpip/stack/route.go:410 +0xb7 fp=0xc088ff6320 sp=0xc088ff62e0 pc=0x936dd7
gvisor.dev/gvisor/pkg/tcpip/transport/udp.sendUDP(0xc003033080, 0x0, 0x0, 0x0, 0x0, 0x1004e22baff, 0x1303160, 0xc008c3ea80, 0xc000000000, 0x0)
	pkg/tcpip/transport/udp/endpoint.go:898 +0x43b fp=0xc088ff7328 sp=0xc088ff6320 pc=0xaeb4fb
gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).write(0xc0019d0780, 0x1305d60, 0xc001ec0c80, 0xc003899dc0, 0x0, 0x0, 0x0, 0x0)
	pkg/tcpip/transport/udp/endpoint.go:563 +0x5ea fp=0xc088ff74a8 sp=0xc088ff7328 pc=0xae954a
gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).Write(0xc0019d0780, 0x1305d60, 0xc001ec0c80, 0xc003899dc0, 0xc008000000, 0x10, 0x884e22, 0xc005e5000a)
	pkg/tcpip/transport/udp/endpoint.go:407 +0x68 fp=0xc088ff74f8 sp=0xc088ff74a8 pc=0xae8e08
gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*socketOpsCommon).SendMsg(0xc00330a670, 0xc008c3ea80, 0x1320d00, 0xc008af0000, 0x0, 0x0, 0x0, 0x0, 0x100, 0xc005e518c0, ...)
	pkg/sentry/socket/netstack/netstack.go:2983 +0x19d fp=0xc088ff77e8 sp=0xc088ff74f8 pc=0xb2ed9d
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.sendSingleMsg(0xc008c3ea80, 0x3fdf7c281038, 0xc00330a600, 0xc00330a600, 0x20004e40, 0xc000000000, 0x2b5ae3508c70, 0xc008c3f3c4, 0x10)
	pkg/sentry/syscalls/linux/vfs2/socket.go:1051 +0x3c2 fp=0xc088ff7a28 sp=0xc088ff77e8 pc=0xda3de2
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.SendMMsg(0xc008c3ea80, 0x3, 0x20004e40, 0x2, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/vfs2/socket.go:975 +0x2a6 fp=0xc088ff7af8 sp=0xc088ff7a28 pc=0xda3626
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc008c3ea80, 0x133, 0x3, 0x20004e40, 0x2, 0x0, 0x0, 0x0, 0xddd4b7, 0x11a7a20, ...)
	pkg/sentry/kernel/task_syscall.go:104 +0x13c fp=0xc088ff7c58 sp=0xc088ff7af8 pc=0x9d273c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc008c3ea80, 0x133, 0x3, 0x20004e40, 0x2, 0x0, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:239 +0x66 fp=0xc088ff7ce0 sp=0xc088ff7c58 pc=0x9d3906
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc008c3ea80, 0x133, 0x3, 0x20004e40, 0x2, 0x0, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:199 +0x98 fp=0xc088ff7d40 sp=0xc088ff7ce0 pc=0x9d34b8
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc008c3ea80, 0x2, 0xc008c3ea80)
	pkg/sentry/kernel/task_syscall.go:174 +0x15c fp=0xc088ff7e10 sp=0xc088ff7d40 pc=0x9d2e5c
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc008c3ea80, 0x12f8100, 0x0)
	pkg/sentry/kernel/task_run.go:282 +0xc45 fp=0xc088ff7f60 sp=0xc088ff7e10 pc=0x9c7265
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc008c3ea80, 0x1729)
	pkg/sentry/kernel/task_run.go:97 +0x1af fp=0xc088ff7fd0 sp=0xc088ff7f60 pc=0x9c5f2f
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc088ff7fd8 sp=0xc088ff7fd0 pc=0x4705a1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:323 +0xfe