panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x78bee4]

goroutine 506 [running]:
panic({0xd5ea40, 0x1d6cdf0})
	GOROOT/src/runtime/panic.go:987 +0x3ac fp=0x4000feec20 sp=0x4000feeb60 pc=0x4518c
runtime.panicmem()
	GOROOT/src/runtime/panic.go:260 +0x48 fp=0x4000feec40 sp=0x4000feec20 pc=0x43b08
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x214 fp=0x4000feec80 sp=0x4000feec40 pc=0x5c8d4
gvisor.dev/gvisor/pkg/sentry/inet.(*Namespace).Stack(...)
	pkg/sentry/inet/namespace.go:108
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskNetDir(0x40006d8460, {0x11b3e40, 0x40010aca80}, 0x4000d37500)
	pkg/sentry/fsimpl/proc/task_net.go:46 +0x104 fp=0x4000feeda0 sp=0x4000feec90 pc=0x78bee4
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskInode(0x40006d8460, {0x11b3e40, 0x40010aca80}, 0x4000d37500, 0x4000cfdf80, 0x1, 0x0)
	pkg/sentry/fsimpl/proc/task.go:73 +0xddc fp=0x4000fef030 sp=0x4000feeda0 pc=0x77fc0c
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*tasksInode).Lookup(0x40011a8c00, {0x11b3e40, 0x40010aca80}, {0x40006bf410, 0x2})
	pkg/sentry/fsimpl/proc/tasks.go:130 +0x220 fp=0x4000fef0e0 sp=0x4000fef030 pc=0x7911f0
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).revalidateChildLocked(0x40000dad80?, {0x11b3e40?, 0x40010aca80?}, 0x2?, 0x4000e62b40, {0x40006bf410, 0x2}, 0x4000e62ab0?)
	pkg/sentry/fsimpl/kernfs/filesystem.go:131 +0x150 fp=0x4000fef160 sp=0x4000fef0e0 pc=0x3d4280
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).stepExistingLocked(0x4000fef360?, {0x11b3e40, 0x40010aca80}, 0x40000dad80, 0x4000e62b40)
	pkg/sentry/fsimpl/kernfs/filesystem.go:75 +0x2d0 fp=0x4000fef210 sp=0x4000fef160 pc=0x3d3de0
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).walkExistingLocked(0x4000fef2f8?, {0x11b3e40, 0x40010aca80}, 0x40000dad80)
	pkg/sentry/fsimpl/kernfs/filesystem.go:163 +0xb4 fp=0x4000fef250 sp=0x4000fef210 pc=0x3d44a4
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).OpenAt(0x40006d8460, {0x11b3e40, 0x40010aca80}, 0x40000dad80, {0x20002, 0x0, 0x0})
	pkg/sentry/fsimpl/kernfs/filesystem.go:486 +0x41c fp=0x4000fef4c0 sp=0x4000fef250 pc=0x3d767c
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).OpenAt(0x40000d8900?, {0x11b3e40?, 0x40010aca80?}, 0x40000dad80?, {0x1dd1f98?, 0x0?, 0x0?})
	<autogenerated>:1 +0x30 fp=0x4000fef500 sp=0x4000fef4c0 pc=0x7a7ed0
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).OpenAt(0x4001085e80?, {0x11b3e40, 0x40010aca80}, 0x4204?, 0x4000fef7d8, 0x4000fef770)
	pkg/sentry/vfs/vfs.go:460 +0x2ac fp=0x4000fef720 sp=0x4000fef500 pc=0x36cdac
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.openat(0x40010aca80, 0x0?, 0x3348a?, 0x2, 0x0)
	pkg/sentry/syscalls/linux/sys_file.go:112 +0x1c4 fp=0x4000fef890 sp=0x4000fef720 pc=0x6bcf64
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Openat(0x24?, 0x0?, {{0xffffffffffffff9c}, {0xf51dd6d3fbc0}, {0x2}, {0x0}, {0xf532781a64a0}, {0x73}})
	pkg/sentry/syscalls/linux/sys_file.go:91 +0x5c fp=0x4000fef8d0 sp=0x4000fef890 pc=0x6bccec
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0x40010aca80, 0x38, {{0xffffffffffffff9c}, {0xf51dd6d3fbc0}, {0x2}, {0x0}, {0xf532781a64a0}, {0x73}})
	pkg/sentry/kernel/task_syscall.go:142 +0x678 fp=0x4000fefc10 sp=0x4000fef8d0 pc=0x5825d8
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0x40010aca80, 0x0?, {{0xffffffffffffff9c}, {0xf51dd6d3fbc0}, {0x2}, {0x0}, {0xf532781a64a0}, {0x73}})
	pkg/sentry/kernel/task_syscall.go:322 +0x48 fp=0x4000fefc70 sp=0x4000fefc10 pc=0x5838b8
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0x4000fefd58?, 0x89acc0?, {{0xffffffffffffff9c}, {0xf51dd6d3fbc0}, {0x2}, {0x0}, {0xf532781a64a0}, {0x73}})
	pkg/sentry/kernel/task_syscall.go:282 +0x7c fp=0x4000fefcd0 sp=0x4000fefc70 pc=0x5834bc
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0x40001175f0?)
	pkg/sentry/kernel/task_syscall.go:257 +0x330 fp=0x4000fefdd0 sp=0x4000fefcd0 pc=0x5831e0
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x40006f8a00?, 0x40010aca80)
	pkg/sentry/kernel/task_run.go:269 +0x116c fp=0x4000feff20 sp=0x4000fefdd0 pc=0x57638c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0x40010aca80, 0x24)
	pkg/sentry/kernel/task_run.go:98 +0x250 fp=0x4000feffb0 sp=0x4000feff20 pc=0x574b80
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:389 +0x2c fp=0x4000feffd0 sp=0x4000feffb0 pc=0x580d0c
runtime.goexit()
	src/runtime/asm_arm64.s:1172 +0x4 fp=0x4000feffd0 sp=0x4000feffd0 pc=0x7a5b4
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:389 +0xf8