panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0xb55ec4]

goroutine 133 [running]:
panic({0x1192ea0, 0x1fada30})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc000534c40 sp=0xc000534b80 pc=0x436d7b
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc000534ca0 sp=0xc000534c40 pc=0x44e3bd
gvisor.dev/gvisor/pkg/sentry/inet.(*Namespace).Stack(...)
	pkg/sentry/inet/namespace.go:108
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskNetDir(0xc0002f6e60, {0x159a380, 0xc00085e000}, 0xc000141500)
	pkg/sentry/fsimpl/proc/task_net.go:46 +0xc4 fp=0xc000534da8 sp=0xc000534ca0 pc=0xb55ec4
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).newTaskInode(0xc0002f6e60, {0x159a380, 0xc00085e000}, 0xc000141500, 0xc0002de3f0, 0x1, 0x0)
	pkg/sentry/fsimpl/proc/task.go:73 +0xcc5 fp=0xc000534fa0 sp=0xc000534da8 pc=0xb49de5
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*tasksInode).Lookup(0xc000a9c000, {0x159a380, 0xc00085e000}, {0xc0002e3e10, 0x1})
	pkg/sentry/fsimpl/proc/tasks.go:130 +0x231 fp=0xc000535048 sp=0xc000534fa0 pc=0xb5bab1
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).revalidateChildLocked(0xc00036d680?, {0x159a380?, 0xc00085e000?}, 0x1?, 0xc000a17680, {0xc0002e3e10, 0x1}, 0xc000a175f0?)
	pkg/sentry/fsimpl/kernfs/filesystem.go:131 +0x16c fp=0xc0005350c0 sp=0xc000535048 pc=0x7b87cc
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).stepExistingLocked(0xc0005352b8?, {0x159a380, 0xc00085e000}, 0xc00036d680, 0xc000a17680)
	pkg/sentry/fsimpl/kernfs/filesystem.go:75 +0x29f fp=0xc000535170 sp=0xc0005350c0 pc=0x7b839f
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).walkExistingLocked(0xc000535248?, {0x159a380, 0xc00085e000}, 0xc00036d680)
	pkg/sentry/fsimpl/kernfs/filesystem.go:163 +0x85 fp=0xc0005351b0 sp=0xc000535170 pc=0x7b89a5
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).OpenAt(0xc0002f6e60, {0x159a380, 0xc00085e000}, 0xc00036d680, {0x8002, 0x0, 0x0})
	pkg/sentry/fsimpl/kernfs/filesystem.go:486 +0x565 fp=0xc000535418 sp=0xc0005351b0 pc=0x7bbda5
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*filesystem).OpenAt(0xc0002f81e0?, {0x159a380?, 0xc00085e000?}, 0xc00036d680?, {0x200cb90?, 0x0?, 0x0?})
	<autogenerated>:1 +0x2e fp=0xc000535450 sp=0xc000535418 pc=0xb7354e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).OpenAt(0xc0005b6200?, {0x159a380, 0xc00085e000}, 0xc000186000?, 0xc000535770, 0xc000535708)
	pkg/sentry/vfs/vfs.go:460 +0x23d fp=0xc000535670 sp=0xc000535450 pc=0x7600fd
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.openat(0xc00085e000, 0x141500?, 0xc000535870?, 0x2, 0x0)
	pkg/sentry/syscalls/linux/sys_file.go:112 +0x254 fp=0xc000535830 sp=0xc000535670 pc=0xa863d4
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Openat(0xc000852878?, 0x0?, {{0xffffff9c}, {0x7f8d54ca99d0}, {0x2}, {0x0}, {0x11}, {0x7f8d54ca9707}})
	pkg/sentry/syscalls/linux/sys_file.go:91 +0x2d fp=0xc000535868 sp=0xc000535830 pc=0xa860ed
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00085e000, 0x101, {{0xffffff9c}, {0x7f8d54ca99d0}, {0x2}, {0x0}, {0x11}, {0x7f8d54ca9707}})
	pkg/sentry/kernel/task_syscall.go:142 +0x755 fp=0xc000535c58 sp=0xc000535868 pc=0x958b75
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00085e000, 0x1?, {{0xffffff9c}, {0x7f8d54ca99d0}, {0x2}, {0x0}, {0x11}, {0x7f8d54ca9707}})
	pkg/sentry/kernel/task_syscall.go:322 +0x4a fp=0xc000535cb8 sp=0xc000535c58 pc=0x959daa
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000366fc0?, 0xc000535e00?, {{0xffffff9c}, {0x7f8d54ca99d0}, {0x2}, {0x0}, {0x11}, {0x7f8d54ca9707}})
	pkg/sentry/kernel/task_syscall.go:282 +0x65 fp=0xc000535d18 sp=0xc000535cb8 pc=0x959a85
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000860000?)
	pkg/sentry/kernel/task_syscall.go:257 +0x2f0 fp=0xc000535e10 sp=0xc000535d18 pc=0x9597f0
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000902380?, 0xc00085e000)
	pkg/sentry/kernel/task_run.go:269 +0x101e fp=0xc000535f48 sp=0xc000535e10 pc=0x94d8de
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00085e000, 0x8)
	pkg/sentry/kernel/task_run.go:98 +0x1f8 fp=0xc000535fc0 sp=0xc000535f48 pc=0x94c218
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:389 +0x2a fp=0xc000535fe0 sp=0xc000535fc0 pc=0x95736a
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000535fe8 sp=0xc000535fe0 pc=0x46d821
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:389 +0xef