panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x1ecb6bd]

goroutine 317 [running]:
panic({0x322f40, 0x2800340})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc0006481b8 sp=0xc0006480f8 pc=0x130d87b
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc000648218 sp=0xc0006481b8 pc=0x132675d
gvisor.dev/gvisor/pkg/sentry/inet.(*Namespace).Stack(...)
	pkg/sentry/inet/namespace.go:108
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskNetDir(0xc0002481e0, {0x84d3c0, 0xc0006cb500}, 0xc00063e000)
	pkg/sentry/fsimpl/proc/task_net.go:46 +0x31d fp=0xc000648470 sp=0xc000648218 pc=0x1ecb6bd
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskInode(0xc0002481e0, {0x84d3c0, 0xc0006cb500}, 0xc00063e000, 0xc000240230, 0x1, 0x0)
	pkg/sentry/fsimpl/proc/task.go:73 +0x1594 fp=0xc0006488b0 sp=0xc000648470 pc=0x1eb8ff4
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*tasksInode).Lookup(0xc0005ef800, {0x84d3c0, 0xc0006cb500}, {0xc00020f110, 0x2})
	pkg/sentry/fsimpl/proc/tasks.go:130 +0x3e5 fp=0xc0006489c0 sp=0xc0006488b0 pc=0x1ed3945
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).revalidateChildLocked(0x313600?, {0x84d3c0, 0xc0006cb500}, 0x2?, 0xc000154bd0, {0xc00020f110, 0x2}, 0x0)
	pkg/sentry/fsimpl/kernfs/filesystem.go:131 +0x1d8 fp=0xc000648a58 sp=0xc0006489c0 pc=0x190eab8
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).stepExistingLocked(0x131f4b9?, {0x84d3c0, 0xc0006cb500}, 0xc000234900, 0xc000154bd0)
	pkg/sentry/fsimpl/kernfs/filesystem.go:75 +0x3ea fp=0xc000648b98 sp=0xc000648a58 pc=0x190e48a
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).walkExistingLocked(0xc000248230?, {0x84d3c0, 0xc0006cb500}, 0xc000234900)
	pkg/sentry/fsimpl/kernfs/filesystem.go:163 +0xdf fp=0xc000648c00 sp=0xc000648b98 pc=0x190ed9f
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).OpenAt(0xc0002481e0, {0x84d3c0, 0xc0006cb500}, 0xc000234900, {0x8002, 0x0, 0x0})
	pkg/sentry/fsimpl/kernfs/filesystem.go:486 +0x1c5 fp=0xc000648ef0 sp=0xc000648c00 pc=0x1912d65
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).OpenAt(0xc0002481e0, {0x84d3c0, 0xc0006cb500}, 0xc000234900?, {0x37f5300?, 0x0?, 0x0?})
	<autogenerated>:1 +0x85 fp=0xc000648f50 sp=0xc000648ef0 pc=0x1ef4f65
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).OpenAt(0xc00096c940?, {0x84d3c0, 0xc0006cb500}, 0xc000190400?, 0xc000649370, 0xc000649268)
	pkg/sentry/vfs/vfs.go:460 +0x517 fp=0xc0006491c0 sp=0xc000648f50 pc=0x1872a17
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.openat(0xc0006cb500, 0x1?, 0x1349ba5?, 0x2, 0x0)
	pkg/sentry/syscalls/linux/sys_file.go:112 +0x2b2 fp=0xc000649420 sp=0xc0006491c0 pc=0x1d9cff2
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Openat(0xc0006494c0?, 0x1347fb9?, {{0xffffff9c}, {0x7fbd96a88bd0}, {0x2}, {0x0}, {0x12}, {0x7fbd96a88906}})
	pkg/sentry/syscalls/linux/sys_file.go:91 +0x45 fp=0xc000649480 sp=0xc000649420 pc=0x1d9cc45
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0006cb500, 0x101, {{0xffffff9c}, {0x7fbd96a88bd0}, {0x2}, {0x0}, {0x12}, {0x7fbd96a88906}})
	pkg/sentry/kernel/task_syscall.go:142 +0x9c2 fp=0xc000649960 sp=0xc000649480 pc=0x1bb0002
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0006cb500, 0x0?, {{0xffffff9c}, {0x7fbd96a88bd0}, {0x2}, {0x0}, {0x12}, {0x7fbd96a88906}})
	pkg/sentry/kernel/task_syscall.go:322 +0x7d fp=0xc0006499f8 sp=0xc000649960 pc=0x1bb1dfd
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000566090?, 0xc0007d00d0?, {{0xffffff9c}, {0x7fbd96a88bd0}, {0x2}, {0x0}, {0x12}, {0x7fbd96a88906}})
	pkg/sentry/kernel/task_syscall.go:282 +0x8f fp=0xc000649a70 sp=0xc0006499f8 pc=0x1bb17af
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0006cb500)
	pkg/sentry/kernel/task_syscall.go:257 +0x4c5 fp=0xc000649b98 sp=0xc000649a70 pc=0x1bb1345
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc0006cb500?, 0xc0006cb500)
	pkg/sentry/kernel/task_run.go:269 +0x1d4b fp=0xc000649e70 sp=0xc000649b98 pc=0x1b9ba0b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0006cb500, 0xa)
	pkg/sentry/kernel/task_run.go:98 +0x41b fp=0xc000649fb0 sp=0xc000649e70 pc=0x1b9929b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:389 +0x48 fp=0xc000649fe0 sp=0xc000649fb0 pc=0x1badb08
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000649fe8 sp=0xc000649fe0 pc=0x1346801
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:389 +0x1ad