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=0x7a5194]

goroutine 1249 [running]:
panic(0x1023560, 0x1a88090)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc0006df380 sp=0xc0006df2c8 pc=0x437030
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc0006df3b0 sp=0xc0006df380 pc=0x44de13
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef(0x0, 0x1326120, 0xc0002c4000)
	pkg/sentry/vfs/file_description.go:163 +0x54 fp=0xc0006df3f0 sp=0xc0006df3b0 pc=0x7a5194
runtime.call32(0x0, 0x11ecf38, 0xc0001f89a8, 0x1800000018)
	src/runtime/asm_amd64.s:540 +0x3e fp=0xc0006df420 sp=0xc0006df3f0 pc=0x46ed1e
runtime.reflectcallSave(0xc0006df550, 0x11ecf38, 0xc0001f89a8, 0xc000000018)
	GOROOT/src/runtime/panic.go:881 +0x58 fp=0xc0006df450 sp=0xc0006df420 pc=0x436af8
runtime.runOpenDeferFrame(0xc000689e00, 0xc0001f8960, 0xc0006df598)
	GOROOT/src/runtime/panic.go:855 +0x2cd fp=0xc0006df4e0 sp=0xc0006df450 pc=0x4369ad
panic(0x1023560, 0x1a88090)
	GOROOT/src/runtime/panic.go:969 +0x175 fp=0xc0006df598 sp=0xc0006df4e0 pc=0x436d35
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc0006df5c8 sp=0xc0006df598 pc=0x44de13
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Impl(...)
	pkg/sentry/vfs/file_description.go:300
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.FilesystemType.GetFilesystem(0x1326120, 0xc0002c4000, 0xc0002cf588, 0xc0009ac000, 0xc0002ee200, 0x0, 0xc0002ee600, 0x1a, 0x0, 0x0, ...)
	pkg/sentry/fsimpl/fuse/fusefs.go:133 +0x418 fp=0xc0006df750 sp=0xc0006df5c8 pc=0xe62198
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.(*FilesystemType).GetFilesystem(0x1acece0, 0x1326120, 0xc0002c4000, 0xc0002cf588, 0xc0009ac000, 0xc0002ee200, 0x0, 0xc0002ee600, 0x1a, 0x0, ...)
	<autogenerated>:1 +0xc5 fp=0xc0006df7d0 sp=0xc0006df750 pc=0xe70e05
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountDisconnected(0xc0002cf588, 0x1326120, 0xc0002c4000, 0xc0009ac000, 0xc0002ee200, 0x0, 0xc0002ee100, 0x4, 0xc0006dfa50, 0x0, ...)
	pkg/sentry/vfs/mount.go:200 +0x13e fp=0xc0006df8a0 sp=0xc0006df7d0 pc=0x7af8fe
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountAt(0xc0002cf588, 0x1326120, 0xc0002c4000, 0xc0009ac000, 0xc0002ee200, 0x0, 0xc0006dfa80, 0xc0002ee100, 0x4, 0xc0006dfa50, ...)
	pkg/sentry/vfs/mount.go:272 +0xd4 fp=0xc0006df940 sp=0xc0006df8a0 pc=0x7affd4
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Mount(0xc0002c4000, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/vfs2/mount.go:112 +0x499 fp=0xc0006dfaf8 sp=0xc0006df940 pc=0xd90559
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0002c4000, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x1, 0x11a7ae0, ...)
	pkg/sentry/kernel/task_syscall.go:104 +0x13c fp=0xc0006dfc58 sp=0xc0006dfaf8 pc=0x9d333c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0002c4000, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x20000040, 0x0)
	pkg/sentry/kernel/task_syscall.go:239 +0x66 fp=0xc0006dfce0 sp=0xc0006dfc58 pc=0x9d4506
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0002c4000, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0xde9d2e, 0xc0008aa2e0)
	pkg/sentry/kernel/task_syscall.go:199 +0x98 fp=0xc0006dfd40 sp=0xc0006dfce0 pc=0x9d40b8
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0002c4000, 0x2, 0xc0002c4000)
	pkg/sentry/kernel/task_syscall.go:174 +0x15c fp=0xc0006dfe10 sp=0xc0006dfd40 pc=0x9d3a5c
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0002c4000, 0x12f8260, 0x0)
	pkg/sentry/kernel/task_run.go:282 +0xc45 fp=0xc0006dff60 sp=0xc0006dfe10 pc=0x9c7e65
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0002c4000, 0x1e)
	pkg/sentry/kernel/task_run.go:97 +0x1af fp=0xc0006dffd0 sp=0xc0006dff60 pc=0x9c6b2f
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc0006dffd8 sp=0xc0006dffd0 pc=0x4705a1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:323 +0xfe