panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x17689d3]

goroutine 2625180 [running]:
panic({0x305940?, 0x25d0c60?})
	GOROOT/src/runtime/panic.go:1017 +0x3ac fp=0xc009339a08 sp=0xc009339958 pc=0x11ad0ec
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:261
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:861 +0x378 fp=0xc009339a68 sp=0xc009339a08 pc=0x11c60f8
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).IncRef(0x0)
	pkg/sentry/vfs/mount.go:693 +0x33 fp=0xc009339a88 sp=0xc009339a68 pc=0x17689d3
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc00035f680, 0x0)
	pkg/sentry/vfs/namespace.go:143 +0x385 fp=0xc009339b98 sp=0xc009339a88 pc=0x1770d45
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc00035f4a0, 0xc001414c80)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc009339ca8 sp=0xc009339b98 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc0001a3e00, 0xc001414be0)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc009339db8 sp=0xc009339ca8 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc0014141e0, 0xc001414b40)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc009339ec8 sp=0xc009339db8 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc000003400, 0xc001414a00)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc009339fd8 sp=0xc009339ec8 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc000003540, 0xc001414960)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc00933a0e8 sp=0xc009339fd8 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc0000037c0, 0xc0014148c0)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc00933a1f8 sp=0xc00933a0e8 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc002dba140, 0xc001414820)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc00933a308 sp=0xc00933a1f8 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc002dba280, 0xc001414780)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc00933a418 sp=0xc00933a308 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc002dba500, 0xc0014146e0)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc00933a528 sp=0xc00933a418 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc002dba820, 0xc001414640)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc00933a638 sp=0xc00933a528 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc002dba780, 0xc0014145a0)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc00933a748 sp=0xc00933a638 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc002dba960, 0xc001414500)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc00933a858 sp=0xc00933a748 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc002dbac80, 0xc001414460)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc00933a968 sp=0xc00933a858 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc002dbaf00, 0xc0014143c0)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc00933aa78 sp=0xc00933a968 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc002dbb220, 0xc001414320)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc00933ab88 sp=0xc00933aa78 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc008fc1d90, 0xc008fc1da0, 0xc000270140, 0xc001414280)
	pkg/sentry/vfs/namespace.go:147 +0x47e fp=0xc00933ac98 sp=0xc00933ab88 pc=0x1770e3e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).CloneMountNamespace(0xc00067c1e0, {0x6fec98, 0xc04b081500}, 0xc002ef3f20, 0xc002e95bf0, 0x6c00000?, 0x101000101010101?, {0x6e27c0, 0xc00067c000})
	pkg/sentry/vfs/namespace.go:186 +0x4e8 fp=0xc00933ade0 sp=0xc00933ac98 pc=0x17713a8
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Clone(0xc04b081500, 0xc00933b368)
	pkg/sentry/kernel/task_clone.go:205 +0x1b05 fp=0xc00933b348 sp=0xc00933ade0 pc=0x1ab8b65
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.clone(0x11e7c8c?, 0x120400, 0x200000c0, 0x0, 0x0, 0x0)
	pkg/sentry/syscalls/linux/sys_thread.go:215 +0x145 fp=0xc00933b448 sp=0xc00933b348 pc=0x1d5c325
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Clone(0xc0023b5540?, 0x11e072e?, {{0x120400}, {0x200000c0}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_clone_amd64.go:36 +0xef fp=0xc00933b4d0 sp=0xc00933b448 pc=0x1d008cf
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc04b081500, 0x38, {{0x120400}, {0x200000c0}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0xaff fp=0xc00933b908 sp=0xc00933b4d0 pc=0x1af213f
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc04b081500, 0x1?, {{0x120400}, {0x200000c0}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x7d fp=0xc00933b9c0 sp=0xc00933b908 pc=0x1af41fd
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc002d60c30?, 0x11e9329?, {{0x120400}, {0x200000c0}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0xbd fp=0xc00933ba38 sp=0xc00933b9c0 pc=0x1af3afd
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc04b081500)
	pkg/sentry/kernel/task_syscall.go:257 +0x55b fp=0xc00933bb70 sp=0xc00933ba38 pc=0x1af365b
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc04b081500?, 0xc04b081500)
	pkg/sentry/kernel/task_run.go:269 +0x2387 fp=0xc00933be60 sp=0xc00933bb70 pc=0x1adc487
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc04b081500, 0x29e6)
	pkg/sentry/kernel/task_run.go:98 +0x36a fp=0xc00933bfb0 sp=0xc00933be60 pc=0x1ad97ea
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:395 +0x45 fp=0xc00933bfe0 sp=0xc00933bfb0 pc=0x1aef9a5
runtime.goexit()
	src/runtime/asm_amd64.s:1650 +0x1 fp=0xc00933bfe8 sp=0xc00933bfe0 pc=0x11e6101
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 2625193
	pkg/sentry/kernel/task_start.go:395 +0x1ce