panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x7878ea]

goroutine 3224261 [running]:
panic({0x1115fa0?, 0x2a4c590?})
	GOROOT/src/runtime/panic.go:1017 +0x3ac fp=0xc002a10be0 sp=0xc002a10b30 pc=0x43a72c
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:261
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:861 +0x378 fp=0xc002a10c40 sp=0xc002a10be0 pc=0x451f38
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).IncRef(0x1108f40?)
	pkg/sentry/vfs/mount.go:693 +0xa fp=0xc002a10c48 sp=0xc002a10c40 pc=0x7878ea
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00025efe0, {0x15144d8, 0xc0031bd500}, 0xc008cb6050, 0xc008cb6060, 0xc000123360, 0x0)
	pkg/sentry/vfs/namespace.go:138 +0xee fp=0xc002a10d18 sp=0xc002a10c48 pc=0x78cf2e
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00025efe0, {0x15144d8, 0xc0031bd500}, 0xc008cb6050, 0xc008cb6060, 0xc0001230e0, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc002a10de8 sp=0xc002a10d18 pc=0x78d0ba
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00025efe0, {0x15144d8, 0xc0031bd500}, 0xc008cb6050, 0xc008cb6060, 0xc0057e0f00, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc002a10eb8 sp=0xc002a10de8 pc=0x78d0ba
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00025efe0, {0x15144d8, 0xc0031bd500}, 0xc008cb6050, 0xc008cb6060, 0xc00abad9a0, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc002a10f88 sp=0xc002a10eb8 pc=0x78d0ba
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00025efe0, {0x15144d8, 0xc0031bd500}, 0xc008cb6050, 0xc008cb6060, 0xc008b5cd20, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc002a11058 sp=0xc002a10f88 pc=0x78d0ba
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00025efe0, {0x15144d8, 0xc0031bd500}, 0xc008cb6050, 0xc008cb6060, 0xc009c5f900, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc002a11128 sp=0xc002a11058 pc=0x78d0ba
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00025efe0, {0x15144d8, 0xc0031bd500}, 0xc008cb6050, 0xc008cb6060, 0xc00c985a40, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc002a111f8 sp=0xc002a11128 pc=0x78d0ba
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00025efe0, {0x15144d8, 0xc0031bd500}, 0xc008cb6050, 0xc008cb6060, 0xc006a1b2c0, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc002a112c8 sp=0xc002a111f8 pc=0x78d0ba
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00025efe0, {0x15144d8, 0xc0031bd500}, 0xc008cb6050, 0xc008cb6060, 0xc00abad540, 0xc006144b40)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc002a11398 sp=0xc002a112c8 pc=0x78d0ba
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00025efe0, {0x15144d8, 0xc0031bd500}, 0xc008cb6050, 0xc008cb6060, 0xc004268320, 0xc006144a00)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc002a11468 sp=0xc002a11398 pc=0x78d0ba
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00025efe0, {0x15144d8, 0xc0031bd500}, 0xc008cb6050, 0xc008cb6060, 0xc00c984140, 0xc006144500)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc002a11538 sp=0xc002a11468 pc=0x78d0ba
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc00025efe0, {0x15144d8, 0xc0031bd500}, 0xc008cb6050, 0xc008cb6060, 0xc000122f00, 0xc006144460)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc002a11608 sp=0xc002a11538 pc=0x78d0ba
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).CloneMountNamespace(0xc00025efe0, {0x15144d8, 0xc0031bd500}, 0xc000880c00, 0xc000842480, 0xc0051a0480?, 0x1?, {0x14f7f60, 0xc00025ee00})
	pkg/sentry/vfs/namespace.go:186 +0x270 fp=0xc002a116d0 sp=0xc002a11608 pc=0x78d3b0
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Unshare(0xc0031bd500, 0x8061080)
	pkg/sentry/kernel/task_clone.go:667 +0xfb3 fp=0xc002a118f0 sp=0xc002a116d0 pc=0x99fe33
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Unshare(0x2?, 0xc002a11960?, {{0x8061080}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_thread.go:494 +0x6c fp=0xc002a11910 sp=0xc002a118f0 pc=0xb56b8c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0031bd500, 0x110, {{0x8061080}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x80b fp=0xc002a11c50 sp=0xc002a11910 pc=0x9bfc4b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0031bd500, 0x1?, {{0x8061080}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x4e fp=0xc002a11cb0 sp=0xc002a11c50 pc=0x9c124e
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0003d0238?, 0xc002a11df8?, {{0x8061080}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x74 fp=0xc002a11d10 sp=0xc002a11cb0 pc=0x9c0e14
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00e248370?)
	pkg/sentry/kernel/task_syscall.go:257 +0x3a8 fp=0xc002a11e08 sp=0xc002a11d10 pc=0x9c0b08
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000d9e600?, 0xc0031bd500)
	pkg/sentry/kernel/task_run.go:269 +0x1405 fp=0xc002a11f48 sp=0xc002a11e08 pc=0x9b2bc5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0031bd500, 0x2107)
	pkg/sentry/kernel/task_run.go:98 +0x262 fp=0xc002a11fc0 sp=0xc002a11f48 pc=0x9b10e2
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:395 +0x25 fp=0xc002a11fe0 sp=0xc002a11fc0 pc=0x9be145
runtime.goexit()
	src/runtime/asm_amd64.s:1650 +0x1 fp=0xc002a11fe8 sp=0xc002a11fe0 pc=0x471241
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 3224258
	pkg/sentry/kernel/task_start.go:395 +0xf8