panic: runtime error: invalid memory address or nil pointer dereference
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x9f50c2]

goroutine 932 [running]:
panic(0x173e340, 0x22aa3c0)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc000a02e88 sp=0xc000a02dd0 pc=0x439090
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc000a02eb8 sp=0xc000a02e88 pc=0x451553
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef(0x0, 0x1ab6000, 0xc000718a80)
	pkg/sentry/vfs/file_description.go:163 +0x62 fp=0xc000a02ef8 sp=0xc000a02eb8 pc=0x9f50c2
runtime.call32(0x0, 0x190f408, 0xc000a03110, 0x1800000018)
	src/runtime/asm_amd64.s:540 +0x3e fp=0xc000a02f28 sp=0xc000a02ef8 pc=0x472bbe
panic(0x173e340, 0x22aa3c0)
	GOROOT/src/runtime/panic.go:975 +0x3e9 fp=0xc000a02fe0 sp=0xc000a02f28 pc=0x439009
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc000a03010 sp=0xc000a02fe0 pc=0x451553
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Impl(...)
	pkg/sentry/vfs/file_description.go:300
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.FilesystemType.GetFilesystem(0x1ab6000, 0xc000718a80, 0xc00035b588, 0xc0004d8360, 0xc000290f00, 0x0, 0xc000291200, 0x1a, 0x0, 0x0, ...)
	pkg/sentry/fsimpl/fuse/fusefs.go:133 +0x579 fp=0xc000a03248 sp=0xc000a03010 pc=0x1441f39
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.(*FilesystemType).GetFilesystem(0x2d32c10, 0x1ab6000, 0xc000718a80, 0xc00035b588, 0xc0004d8360, 0xc000290f00, 0x0, 0xc000291200, 0x1a, 0x0, ...)
	<autogenerated>:1 +0xe5 fp=0xc000a032e8 sp=0xc000a03248 pc=0x1458445
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountDisconnected(0xc00035b588, 0x1ab6000, 0xc000718a80, 0xc0004d8360, 0xc000290f00, 0x0, 0xc000290c00, 0x4, 0xc000a036a0, 0x0, ...)
	pkg/sentry/vfs/mount.go:200 +0x1a2 fp=0xc000a03458 sp=0xc000a032e8 pc=0xa051a2
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountAt(0xc00035b588, 0x1ab6000, 0xc000718a80, 0xc0004d8360, 0xc000290f00, 0x0, 0xc000a036d0, 0xc000290c00, 0x4, 0xc000a036a0, ...)
	pkg/sentry/vfs/mount.go:272 +0xd5 fp=0xc000a03530 sp=0xc000a03458 pc=0xa059d5
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Mount(0xc000718a80, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/vfs2/mount.go:112 +0x4f4 fp=0xc000a03730 sp=0xc000a03530 pc=0x1301614
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000718a80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, ...)
	pkg/sentry/kernel/task_syscall.go:104 +0x453 fp=0xc000a039d0 sp=0xc000a03730 pc=0xd68913
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000718a80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x408638, 0xc00071935f)
	pkg/sentry/kernel/task_syscall.go:239 +0xba fp=0xc000a03ab0 sp=0xc000a039d0 pc=0xd6a09a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000718a80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x138236b, 0x2d326d4)
	pkg/sentry/kernel/task_syscall.go:199 +0x10f fp=0xc000a03b60 sp=0xc000a03ab0 pc=0xd699af
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000718a80, 0x2, 0xc000718a80)
	pkg/sentry/kernel/task_syscall.go:174 +0x1ea fp=0xc000a03ca0 sp=0xc000a03b60 pc=0xd6914a
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc000718a80, 0x1a87b00, 0x0)
	pkg/sentry/kernel/task_run.go:282 +0x12a7 fp=0xc000a03ed8 sp=0xc000a03ca0 pc=0xd54ac7
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000718a80, 0x1e)
	pkg/sentry/kernel/task_run.go:97 +0x398 fp=0xc000a03fd0 sp=0xc000a03ed8 pc=0xd52bf8
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc000a03fd8 sp=0xc000a03fd0 pc=0x4745e1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:323 +0x1a5