panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x79baea]

goroutine 3828885 [running]:
panic({0x11638c0, 0x2a39510})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc001663128 sp=0xc001663068 pc=0x436abb
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc001663188 sp=0xc001663128 pc=0x44e0fd
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).IncRef(0x1151ca0?)
	pkg/sentry/vfs/mount.go:681 +0xa fp=0xc001663190 sp=0xc001663188 pc=0x79baea
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc000922460, 0x0)
	pkg/sentry/vfs/namespace.go:143 +0x1b2 fp=0xc001663260 sp=0xc001663190 pc=0x7a1472
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc0009221e0, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001663330 sp=0xc001663260 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00a64db80, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001663400 sp=0xc001663330 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc005c214a0, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0016634d0 sp=0xc001663400 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc0016caa00, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0016635a0 sp=0xc0016634d0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833a3c0, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001663670 sp=0xc0016635a0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc0097b5180, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001663740 sp=0xc001663670 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc008534820, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001663810 sp=0xc001663740 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00b3b4aa0, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0016638e0 sp=0xc001663810 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00b3b4be0, 0x0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0016639b0 sp=0xc0016638e0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc0073e0280, 0xc005bfe000)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001663a80 sp=0xc0016639b0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc009df9900, 0xc005e45f40)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001663b50 sp=0xc001663a80 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833aa00, 0xc005e45ea0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001663c20 sp=0xc001663b50 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833adc0, 0xc005e45e00)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001663cf0 sp=0xc001663c20 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833b220, 0xc005e45c20)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001663dc0 sp=0xc001663cf0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833b360, 0xc005e45b80)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001663e90 sp=0xc001663dc0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833b400, 0xc005e45a40)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001663f60 sp=0xc001663e90 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833b540, 0xc005e459a0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001664030 sp=0xc001663f60 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833b720, 0xc005e45900)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001664100 sp=0xc001664030 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833b860, 0xc005e457c0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0016641d0 sp=0xc001664100 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833b900, 0xc005e45860)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0016642a0 sp=0xc0016641d0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833b680, 0xc005e45720)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001664370 sp=0xc0016642a0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc0092b6be0, 0xc005e45680)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001664440 sp=0xc001664370 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833bae0, 0xc005e455e0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001664510 sp=0xc001664440 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833bb80, 0xc005e45540)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0016645e0 sp=0xc001664510 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833bc20, 0xc005e454a0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0016646b0 sp=0xc0016645e0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833ba40, 0xc005e45400)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001664780 sp=0xc0016646b0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833b2c0, 0xc005e45360)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001664850 sp=0xc001664780 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833bcc0, 0xc005e452c0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001664920 sp=0xc001664850 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833be00, 0xc005e45220)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0016649f0 sp=0xc001664920 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833b180, 0xc005e45180)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001664ac0 sp=0xc0016649f0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833bea0, 0xc005e45040)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001664b90 sp=0xc001664ac0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833b0e0, 0xc005e44fa0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001664c60 sp=0xc001664b90 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833bf40, 0xc005e44f00)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001664d30 sp=0xc001664c60 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00f5bc000, 0xc005e44e60)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001664e00 sp=0xc001664d30 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833b040, 0xc005e44dc0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001664ed0 sp=0xc001664e00 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833afa0, 0xc005e44b40)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001664fa0 sp=0xc001664ed0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833af00, 0xc005e44aa0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001665070 sp=0xc001664fa0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833ab40, 0xc005e44a00)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001665140 sp=0xc001665070 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc0092b6c80, 0xc005e44960)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001665210 sp=0xc001665140 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc0092b6d20, 0xc005e448c0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0016652e0 sp=0xc001665210 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc0092b6dc0, 0xc005e44820)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc0016653b0 sp=0xc0016652e0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc00833aaa0, 0xc005e446e0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001665480 sp=0xc0016653b0 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc0092b6e60, 0xc005e44500)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001665550 sp=0xc001665480 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).updateRootAndCWD(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc006606950, 0xc006606960, 0xc0009220a0, 0xc005e443c0)
	pkg/sentry/vfs/namespace.go:147 +0x27a fp=0xc001665620 sp=0xc001665550 pc=0x7a153a
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).CloneMountNamespace(0xc0000e81e0, {0x153d540, 0xc00d70ea80}, 0xc00070fc20, 0xc0004cae10, 0x98e226?, 0xc00a33e000?, {0x1521220, 0xc0000e8000})
	pkg/sentry/vfs/namespace.go:186 +0x285 fp=0xc0016656e8 sp=0xc001665620 pc=0x7a1845
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Unshare(0xc00d70ea80, 0x20080)
	pkg/sentry/kernel/task_clone.go:667 +0xfe7 fp=0xc0016658f8 sp=0xc0016656e8 pc=0x9bad67
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Unshare(0x2a946a0?, 0xc00643f9b8?, {{0x20080}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_thread.go:494 +0x76 fp=0xc001665918 sp=0xc0016658f8 pc=0xb7cbb6
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00d70ea80, 0x110, {{0x20080}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x80b fp=0xc001665c58 sp=0xc001665918 pc=0x9db8cb
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00d70ea80, 0x1?, {{0x20080}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x54 fp=0xc001665cb8 sp=0xc001665c58 pc=0x9dceb4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0001e0220?, 0xc00643fe00?, {{0x20080}, {0x0}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x85 fp=0xc001665d18 sp=0xc001665cb8 pc=0x9dcaa5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc013317130?)
	pkg/sentry/kernel/task_syscall.go:257 +0x3ac fp=0xc001665e10 sp=0xc001665d18 pc=0x9dc76c
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc00c4d6f80?, 0xc00d70ea80)
	pkg/sentry/kernel/task_run.go:269 +0x144a fp=0xc001665f48 sp=0xc001665e10 pc=0x9ce1ea
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00d70ea80, 0xc4be)
	pkg/sentry/kernel/task_run.go:98 +0x25c fp=0xc001665fc0 sp=0xc001665f48 pc=0x9cc69c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:395 +0x2a fp=0xc001665fe0 sp=0xc001665fc0 pc=0x9d9d4a
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc001665fe8 sp=0xc001665fe0 pc=0x46d4c1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:395 +0x105