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=0x7d92de]

goroutine 64105 [running]:
panic(0x110a640, 0x1cfc750)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc001b6d410 sp=0xc001b6d358 pc=0x437030
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc001b6d440 sp=0xc001b6d410 pc=0x44de13
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef(0x0, 0x1428fa0, 0xc0021ec000)
	pkg/sentry/vfs/file_description.go:169 +0x5e fp=0xc001b6d480 sp=0xc001b6d440 pc=0x7d92de
runtime.call32(0x0, 0x12e3ea0, 0xc000991fc8, 0x1800000018)
	src/runtime/asm_amd64.s:540 +0x3e fp=0xc001b6d4b0 sp=0xc001b6d480 pc=0x46ed1e
runtime.reflectcallSave(0xc001b6d5e0, 0x12e3ea0, 0xc000991fc8, 0xc000000018)
	GOROOT/src/runtime/panic.go:881 +0x58 fp=0xc001b6d4e0 sp=0xc001b6d4b0 pc=0x436af8
runtime.runOpenDeferFrame(0xc005d86d80, 0xc000991f80, 0xc001b6d628)
	GOROOT/src/runtime/panic.go:855 +0x2cd fp=0xc001b6d570 sp=0xc001b6d4e0 pc=0x4369ad
panic(0x110a640, 0x1cfc750)
	GOROOT/src/runtime/panic.go:969 +0x175 fp=0xc001b6d628 sp=0xc001b6d570 pc=0x436d35
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc001b6d658 sp=0xc001b6d628 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(0x1428fa0, 0xc0021ec000, 0xc000340908, 0xc00015bb60, 0xc000374e00, 0x0, 0xc000375000, 0x1a, 0x0, 0x0, ...)
	pkg/sentry/fsimpl/fuse/fusefs.go:146 +0x437 fp=0xc001b6d7e0 sp=0xc001b6d658 pc=0xf44017
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.(*FilesystemType).GetFilesystem(0x1d434c0, 0x1428fa0, 0xc0021ec000, 0xc000340908, 0xc00015bb60, 0xc000374e00, 0x0, 0xc000375000, 0x1a, 0x0, ...)
	<autogenerated>:1 +0xc5 fp=0xc001b6d860 sp=0xc001b6d7e0 pc=0xf547a5
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountDisconnected(0xc000340908, 0x1428fa0, 0xc0021ec000, 0xc00015bb60, 0xc000374e00, 0x0, 0xc000374b00, 0x4, 0xc001b6dae8, 0x0, ...)
	pkg/sentry/vfs/mount.go:218 +0x15c fp=0xc001b6d930 sp=0xc001b6d860 pc=0x7e52bc
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountAt(0xc000340908, 0x1428fa0, 0xc0021ec000, 0xc00015bb60, 0xc000374e00, 0x0, 0xc001b6db18, 0xc000374b00, 0x4, 0xc001b6dae8, ...)
	pkg/sentry/vfs/mount.go:306 +0xde fp=0xc001b6d9d0 sp=0xc001b6d930 pc=0x7e59fe
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Mount(0xc0021ec000, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/vfs2/mount.go:141 +0x5d4 fp=0xc001b6db90 sp=0xc001b6d9d0 pc=0xe5e8b4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0021ec000, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x128ea20, ...)
	pkg/sentry/kernel/task_syscall.go:116 +0x1b9 fp=0xc001b6dc50 sp=0xc001b6db90 pc=0xa4d139
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0021ec000, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x20000040, 0x0)
	pkg/sentry/kernel/task_syscall.go:291 +0x70 fp=0xc001b6dcd8 sp=0xc001b6dc50 pc=0xa4e3f0
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0021ec000, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0xc0006a7d20, 0xc0006a7c80)
	pkg/sentry/kernel/task_syscall.go:238 +0xb4 fp=0xc001b6dd38 sp=0xc001b6dcd8 pc=0xa4def4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0021ec000, 0x2, 0xc0021ec000)
	pkg/sentry/kernel/task_syscall.go:205 +0x198 fp=0xc001b6de08 sp=0xc001b6dd38 pc=0xa4d7d8
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0021ec000, 0x13fb420, 0x0)
	pkg/sentry/kernel/task_run.go:327 +0xd95 fp=0xc001b6df60 sp=0xc001b6de08 pc=0xa40295
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0021ec000, 0x526)
	pkg/sentry/kernel/task_run.go:100 +0x1e2 fp=0xc001b6dfd0 sp=0xc001b6df60 pc=0xa3eda2
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc001b6dfd8 sp=0xc001b6dfd0 pc=0x4705a1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:374 +0x116