panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0xc27876]

goroutine 28 [running]:
panic({0x12a6e60, 0x22830f0})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc00067ace8 sp=0xc00067ac28 pc=0x436b9b
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc00067ad48 sp=0xc00067ace8 pc=0x44e1dd
gvisor.dev/gvisor/pkg/sentry/inet.(*Namespace).Stack(...)
	pkg/sentry/inet/namespace.go:108
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskNetDir(0xc00017c140, {0x16e3c60, 0xc0007c9500}, 0xc000d02000)
	pkg/sentry/fsimpl/proc/task_net.go:46 +0x116 fp=0xc00067ae50 sp=0xc00067ad48 pc=0xc27876
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskInode(0xc00017c140, {0x16e3c60, 0xc0007c9500}, 0xc000d02000, 0xc00047a8c0, 0x1, 0x0)
	pkg/sentry/fsimpl/proc/task.go:73 +0xe1b fp=0xc00067b048 sp=0xc00067ae50 pc=0xc19efb
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*tasksInode).Lookup(0xc000cd3400, {0x16e3c60, 0xc0007c9500}, {0xc0001a1810, 0x2})
	pkg/sentry/fsimpl/proc/tasks.go:130 +0x285 fp=0xc00067b0f0 sp=0xc00067b048 pc=0xc2d985
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).revalidateChildLocked(0xc0000f2900?, {0x16e3c60?, 0xc0007c9500?}, 0x2?, 0xc00085c360, {0xc0001a1810, 0x2}, 0xc00085c2d0?)
	pkg/sentry/fsimpl/kernfs/filesystem.go:131 +0x1bd fp=0xc00067b168 sp=0xc00067b0f0 pc=0x80373d
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).stepExistingLocked(0xc00067b360?, {0x16e3c60, 0xc0007c9500}, 0xc0000f2900, 0xc00085c360)
	pkg/sentry/fsimpl/kernfs/filesystem.go:75 +0x36a fp=0xc00067b218 sp=0xc00067b168 pc=0x8031aa
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).walkExistingLocked(0xc00067b2f8?, {0x16e3c60, 0xc0007c9500}, 0xc0000f2900)
	pkg/sentry/fsimpl/kernfs/filesystem.go:163 +0xc5 fp=0xc00067b258 sp=0xc00067b218 pc=0x8039a5
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).OpenAt(0xc00017c140, {0x16e3c60, 0xc0007c9500}, 0xc0000f2900, {0x8002, 0x0, 0x0})
	pkg/sentry/fsimpl/kernfs/filesystem.go:486 +0x632 fp=0xc00067b4c8 sp=0xc00067b258 pc=0x8075d2
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).OpenAt(0xc0006221e0?, {0x16e3c60?, 0xc0007c9500?}, 0xc0000f2900?, {0x22e2250?, 0x0?, 0x0?})
	<autogenerated>:1 +0x2e fp=0xc00067b500 sp=0xc00067b4c8 pc=0xc46a6e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).OpenAt(0xc000549980?, {0x16e3c60, 0xc0007c9500}, 0xc0004fe400?, 0xc00067b820, 0xc00067b7b8)
	pkg/sentry/vfs/vfs.go:460 +0x31a fp=0xc00067b720 sp=0xc00067b500 pc=0x79773a
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.openat(0xc0007c9500, 0xd02000?, 0x38?, 0x2, 0x0)
	pkg/sentry/syscalls/linux/sys_file.go:112 +0x29a fp=0xc00067b8e0 sp=0xc00067b720 pc=0xb4123a
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Openat(0x5583d4519000?, 0x4?, {{0xffffff9c}, {0x7fab954ccbd0}, {0x2}, {0x0}, {0x12}, {0x7fab954cc906}})
	pkg/sentry/syscalls/linux/sys_file.go:91 +0x5f fp=0xc00067b918 sp=0xc00067b8e0 pc=0xb40edf
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0007c9500, 0x101, {{0xffffff9c}, {0x7fab954ccbd0}, {0x2}, {0x0}, {0x12}, {0x7fab954cc906}})
	pkg/sentry/kernel/task_syscall.go:142 +0x80b fp=0xc00067bc58 sp=0xc00067b918 pc=0x9e254b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0007c9500, 0x1?, {{0xffffff9c}, {0x7fab954ccbd0}, {0x2}, {0x0}, {0x12}, {0x7fab954cc906}})
	pkg/sentry/kernel/task_syscall.go:322 +0x54 fp=0xc00067bcb8 sp=0xc00067bc58 pc=0x9e3b34
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0001d05e0?, 0xc00067be00?, {{0xffffff9c}, {0x7fab954ccbd0}, {0x2}, {0x0}, {0x12}, {0x7fab954cc906}})
	pkg/sentry/kernel/task_syscall.go:282 +0x85 fp=0xc00067bd18 sp=0xc00067bcb8 pc=0x9e3725
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0001ceb00?)
	pkg/sentry/kernel/task_syscall.go:257 +0x3ac fp=0xc00067be10 sp=0xc00067bd18 pc=0x9e33ec
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000924380?, 0xc0007c9500)
	pkg/sentry/kernel/task_run.go:269 +0x144a fp=0xc00067bf48 sp=0xc00067be10 pc=0x9d4eea
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0007c9500, 0xd)
	pkg/sentry/kernel/task_run.go:98 +0x25c fp=0xc00067bfc0 sp=0xc00067bf48 pc=0x9d339c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:389 +0x2a fp=0xc00067bfe0 sp=0xc00067bfc0 pc=0x9e09ca
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc00067bfe8 sp=0xc00067bfe0 pc=0x46d641
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:389 +0x105