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 850 [running]:
panic(0x173e340, 0x22aa3c0)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc0007eae88 sp=0xc0007eadd0 pc=0x439090
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc0007eaeb8 sp=0xc0007eae88 pc=0x451553
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef(0x0, 0x1ab6000, 0xc0004db500)
	pkg/sentry/vfs/file_description.go:163 +0x62 fp=0xc0007eaef8 sp=0xc0007eaeb8 pc=0x9f50c2
runtime.call32(0x0, 0x190f408, 0xc0007eb110, 0x1800000018)
	src/runtime/asm_amd64.s:540 +0x3e fp=0xc0007eaf28 sp=0xc0007eaef8 pc=0x472bbe
panic(0x173e340, 0x22aa3c0)
	GOROOT/src/runtime/panic.go:975 +0x3e9 fp=0xc0007eafe0 sp=0xc0007eaf28 pc=0x439009
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc0007eb010 sp=0xc0007eafe0 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, 0xc0004db500, 0xc00040a188, 0xc000698a20, 0xc000427100, 0x0, 0xc000427400, 0x1a, 0x0, 0x0, ...)
	pkg/sentry/fsimpl/fuse/fusefs.go:133 +0x579 fp=0xc0007eb248 sp=0xc0007eb010 pc=0x1441f39
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.(*FilesystemType).GetFilesystem(0x2d32c10, 0x1ab6000, 0xc0004db500, 0xc00040a188, 0xc000698a20, 0xc000427100, 0x0, 0xc000427400, 0x1a, 0x0, ...)
	<autogenerated>:1 +0xe5 fp=0xc0007eb2e8 sp=0xc0007eb248 pc=0x1458445
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountDisconnected(0xc00040a188, 0x1ab6000, 0xc0004db500, 0xc000698a20, 0xc000427100, 0x0, 0xc000427000, 0x4, 0xc0007eb6a0, 0x0, ...)
	pkg/sentry/vfs/mount.go:200 +0x1a2 fp=0xc0007eb458 sp=0xc0007eb2e8 pc=0xa051a2
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountAt(0xc00040a188, 0x1ab6000, 0xc0004db500, 0xc000698a20, 0xc000427100, 0x0, 0xc0007eb6d0, 0xc000427000, 0x4, 0xc0007eb6a0, ...)
	pkg/sentry/vfs/mount.go:272 +0xd5 fp=0xc0007eb530 sp=0xc0007eb458 pc=0xa059d5
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Mount(0xc0004db500, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/vfs2/mount.go:112 +0x4f4 fp=0xc0007eb730 sp=0xc0007eb530 pc=0x1301614
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0004db500, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, ...)
	pkg/sentry/kernel/task_syscall.go:104 +0x453 fp=0xc0007eb9d0 sp=0xc0007eb730 pc=0xd68913
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0004db500, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x408638, 0xc0004dbddf)
	pkg/sentry/kernel/task_syscall.go:239 +0xba fp=0xc0007ebab0 sp=0xc0007eb9d0 pc=0xd6a09a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0004db500, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x138236b, 0x2d326d4)
	pkg/sentry/kernel/task_syscall.go:199 +0x10f fp=0xc0007ebb60 sp=0xc0007ebab0 pc=0xd699af
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0004db500, 0x2, 0xc0004db500)
	pkg/sentry/kernel/task_syscall.go:174 +0x1ea fp=0xc0007ebca0 sp=0xc0007ebb60 pc=0xd6914a
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0004db500, 0x1a87b00, 0x0)
	pkg/sentry/kernel/task_run.go:282 +0x12a7 fp=0xc0007ebed8 sp=0xc0007ebca0 pc=0xd54ac7
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0004db500, 0x1c)
	pkg/sentry/kernel/task_run.go:97 +0x398 fp=0xc0007ebfd0 sp=0xc0007ebed8 pc=0xd52bf8
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc0007ebfd8 sp=0xc0007ebfd0 pc=0x4745e1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:323 +0x1a5