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=0x7d8dfe]

goroutine 713 [running]:
panic(0x110a560, 0x1cfc850)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc000841410 sp=0xc000841358 pc=0x437030
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc000841440 sp=0xc000841410 pc=0x44de13
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef(0x0, 0x14291c0, 0xc00053d500)
	pkg/sentry/vfs/file_description.go:169 +0x5e fp=0xc000841480 sp=0xc000841440 pc=0x7d8dfe
runtime.call32(0x0, 0x12e3ee8, 0xc000b24408, 0x1800000018)
	src/runtime/asm_amd64.s:540 +0x3e fp=0xc0008414b0 sp=0xc000841480 pc=0x46ed1e
runtime.reflectcallSave(0xc0008415e0, 0x12e3ee8, 0xc000b24408, 0xc000000018)
	GOROOT/src/runtime/panic.go:881 +0x58 fp=0xc0008414e0 sp=0xc0008414b0 pc=0x436af8
runtime.runOpenDeferFrame(0xc00082de00, 0xc000b243c0, 0xc000841628)
	GOROOT/src/runtime/panic.go:855 +0x2cd fp=0xc000841570 sp=0xc0008414e0 pc=0x4369ad
panic(0x110a560, 0x1cfc850)
	GOROOT/src/runtime/panic.go:969 +0x175 fp=0xc000841628 sp=0xc000841570 pc=0x436d35
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc000841658 sp=0xc000841628 pc=0x44de13
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Impl(...)
	pkg/sentry/vfs/file_description.go:347
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.FilesystemType.GetFilesystem(0x14291c0, 0xc00053d500, 0xc00068c188, 0xc000615080, 0xc00057ce00, 0x0, 0xc00057d000, 0x1a, 0x0, 0x0, ...)
	pkg/sentry/fsimpl/fuse/fusefs.go:146 +0x437 fp=0xc0008417e0 sp=0xc000841658 pc=0xf437d7
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.(*FilesystemType).GetFilesystem(0x1d434a0, 0x14291c0, 0xc00053d500, 0xc00068c188, 0xc000615080, 0xc00057ce00, 0x0, 0xc00057d000, 0x1a, 0x0, ...)
	<autogenerated>:1 +0xc5 fp=0xc000841860 sp=0xc0008417e0 pc=0xf53f65
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountDisconnected(0xc00068c188, 0x14291c0, 0xc00053d500, 0xc000615080, 0xc00057ce00, 0x0, 0xc00057cc00, 0x4, 0xc000841ae8, 0x0, ...)
	pkg/sentry/vfs/mount.go:218 +0x15c fp=0xc000841930 sp=0xc000841860 pc=0x7e4ddc
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountAt(0xc00068c188, 0x14291c0, 0xc00053d500, 0xc000615080, 0xc00057ce00, 0x0, 0xc000841b18, 0xc00057cc00, 0x4, 0xc000841ae8, ...)
	pkg/sentry/vfs/mount.go:306 +0xde fp=0xc0008419d0 sp=0xc000841930 pc=0x7e551e
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Mount(0xc00053d500, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/vfs2/mount.go:141 +0x5d4 fp=0xc000841b90 sp=0xc0008419d0 pc=0xe5dff4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00053d500, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x128eae0, ...)
	pkg/sentry/kernel/task_syscall.go:116 +0x1b9 fp=0xc000841c50 sp=0xc000841b90 pc=0xa4e1d9
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00053d500, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x20000040, 0x0)
	pkg/sentry/kernel/task_syscall.go:291 +0x70 fp=0xc000841cd8 sp=0xc000841c50 pc=0xa4f490
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc00053d500, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0xc00064a520, 0xc00064a480)
	pkg/sentry/kernel/task_syscall.go:238 +0xb4 fp=0xc000841d38 sp=0xc000841cd8 pc=0xa4ef94
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00053d500, 0x2, 0xc00053d500)
	pkg/sentry/kernel/task_syscall.go:205 +0x198 fp=0xc000841e08 sp=0xc000841d38 pc=0xa4e878
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc00053d500, 0x13fb600, 0x0)
	pkg/sentry/kernel/task_run.go:327 +0xd95 fp=0xc000841f60 sp=0xc000841e08 pc=0xa41335
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00053d500, 0x22)
	pkg/sentry/kernel/task_run.go:100 +0x1e2 fp=0xc000841fd0 sp=0xc000841f60 pc=0xa3fe42
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc000841fd8 sp=0xc000841fd0 pc=0x4705a1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:374 +0x116