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

goroutine 6948 [running]:
panic({0x322f40, 0x2800340})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc0004561b8 sp=0xc0004560f8 pc=0x130d87b
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc000456218 sp=0xc0004561b8 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(0xc000405e00, {0x84d3c0, 0xc00478e000}, 0xc004220a80)
	pkg/sentry/fsimpl/proc/task_net.go:46 +0x31d fp=0xc000456470 sp=0xc000456218 pc=0x1ecb6bd
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskInode(0xc000405e00, {0x84d3c0, 0xc00478e000}, 0xc004220a80, 0xc000760540, 0x1, 0x0)
	pkg/sentry/fsimpl/proc/task.go:73 +0x1594 fp=0xc0004568b0 sp=0xc000456470 pc=0x1eb8ff4
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*tasksInode).Lookup(0xc003b0d400, {0x84d3c0, 0xc00478e000}, {0xc002f70d10, 0x2})
	pkg/sentry/fsimpl/proc/tasks.go:130 +0x3e5 fp=0xc0004569c0 sp=0xc0004568b0 pc=0x1ed3945
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).revalidateChildLocked(0x313600?, {0x84d3c0, 0xc00478e000}, 0x2?, 0xc003808360, {0xc002f70d10, 0x2}, 0x0)
	pkg/sentry/fsimpl/kernfs/filesystem.go:131 +0x1d8 fp=0xc000456a58 sp=0xc0004569c0 pc=0x190eab8
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).stepExistingLocked(0x131f4b9?, {0x84d3c0, 0xc00478e000}, 0xc0038b8900, 0xc003808360)
	pkg/sentry/fsimpl/kernfs/filesystem.go:75 +0x3ea fp=0xc000456b98 sp=0xc000456a58 pc=0x190e48a
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).walkExistingLocked(0xc000405e50?, {0x84d3c0, 0xc00478e000}, 0xc0038b8900)
	pkg/sentry/fsimpl/kernfs/filesystem.go:163 +0xdf fp=0xc000456c00 sp=0xc000456b98 pc=0x190ed9f
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).OpenAt(0xc000405e00, {0x84d3c0, 0xc00478e000}, 0xc0038b8900, {0x8002, 0x0, 0x0})
	pkg/sentry/fsimpl/kernfs/filesystem.go:486 +0x1c5 fp=0xc000456ef0 sp=0xc000456c00 pc=0x1912d65
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).OpenAt(0xc000405e00, {0x84d3c0, 0xc00478e000}, 0xc0038b8900?, {0x37f5300?, 0x0?, 0x0?})
	<autogenerated>:1 +0x85 fp=0xc000456f50 sp=0xc000456ef0 pc=0x1ef4f65
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).OpenAt(0xc004005600?, {0x84d3c0, 0xc00478e000}, 0xc00018f200?, 0xc000457370, 0xc000457268)
	pkg/sentry/vfs/vfs.go:460 +0x517 fp=0xc0004571c0 sp=0xc000456f50 pc=0x1872a17
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.openat(0xc00478e000, 0x1?, 0x1349ba5?, 0x2, 0x0)
	pkg/sentry/syscalls/linux/sys_file.go:112 +0x2b2 fp=0xc000457420 sp=0xc0004571c0 pc=0x1d9cff2
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Openat(0xc00478e000?, 0x1347fb9?, {{0xffffff9c}, {0x7fbd6de85030}, {0x2}, {0x0}, {0x0}, {0x7fbd6de84d66}})
	pkg/sentry/syscalls/linux/sys_file.go:91 +0x45 fp=0xc000457480 sp=0xc000457420 pc=0x1d9cc45
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00478e000, 0x101, {{0xffffff9c}, {0x7fbd6de85030}, {0x2}, {0x0}, {0x0}, {0x7fbd6de84d66}})
	pkg/sentry/kernel/task_syscall.go:142 +0x9c2 fp=0xc000457960 sp=0xc000457480 pc=0x1bb0002
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00478e000, 0x0?, {{0xffffff9c}, {0x7fbd6de85030}, {0x2}, {0x0}, {0x0}, {0x7fbd6de84d66}})
	pkg/sentry/kernel/task_syscall.go:322 +0x7d fp=0xc0004579f8 sp=0xc000457960 pc=0x1bb1dfd
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc004788270?, 0xc000d671d0?, {{0xffffff9c}, {0x7fbd6de85030}, {0x2}, {0x0}, {0x0}, {0x7fbd6de84d66}})
	pkg/sentry/kernel/task_syscall.go:282 +0x8f fp=0xc000457a70 sp=0xc0004579f8 pc=0x1bb17af
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00478e000)
	pkg/sentry/kernel/task_syscall.go:257 +0x4c5 fp=0xc000457b98 sp=0xc000457a70 pc=0x1bb1345
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc00478e000?, 0xc00478e000)
	pkg/sentry/kernel/task_run.go:269 +0x1d4b fp=0xc000457e70 sp=0xc000457b98 pc=0x1b9ba0b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00478e000, 0x18c)
	pkg/sentry/kernel/task_run.go:98 +0x41b fp=0xc000457fb0 sp=0xc000457e70 pc=0x1b9929b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:389 +0x48 fp=0xc000457fe0 sp=0xc000457fb0 pc=0x1badb08
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000457fe8 sp=0xc000457fe0 pc=0x1346801
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:389 +0x1ad