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=0x7d93be]

goroutine 38724 [running]:
panic(0x1103bc0, 0x1cea070)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc002f5d410 sp=0xc002f5d358 pc=0x437110
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc002f5d440 sp=0xc002f5d410 pc=0x44def3
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef(0x0, 0x1421460, 0xc002574a80)
	pkg/sentry/vfs/file_description.go:169 +0x5e fp=0xc002f5d480 sp=0xc002f5d440 pc=0x7d93be
runtime.call32(0x0, 0x12dc8a0, 0xc000d38d08, 0x1800000018)
	src/runtime/asm_amd64.s:540 +0x3e fp=0xc002f5d4b0 sp=0xc002f5d480 pc=0x46edfe
runtime.reflectcallSave(0xc002f5d5e0, 0x12dc8a0, 0xc000d38d08, 0xc000000018)
	GOROOT/src/runtime/panic.go:881 +0x58 fp=0xc002f5d4e0 sp=0xc002f5d4b0 pc=0x436bd8
runtime.runOpenDeferFrame(0xc001451380, 0xc000d38cc0, 0xc002f5d628)
	GOROOT/src/runtime/panic.go:855 +0x2cd fp=0xc002f5d570 sp=0xc002f5d4e0 pc=0x436a8d
panic(0x1103bc0, 0x1cea070)
	GOROOT/src/runtime/panic.go:969 +0x175 fp=0xc002f5d628 sp=0xc002f5d570 pc=0x436e15
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc002f5d658 sp=0xc002f5d628 pc=0x44def3
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Impl(...)
	pkg/sentry/vfs/file_description.go:347
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.FilesystemType.GetFilesystem(0x1421460, 0xc002574a80, 0xc00062c188, 0xc00091b800, 0xc0020dd000, 0x0, 0xc0020dd200, 0x1a, 0x0, 0x0, ...)
	pkg/sentry/fsimpl/fuse/fusefs.go:146 +0x437 fp=0xc002f5d7e0 sp=0xc002f5d658 pc=0xf3da57
gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.(*FilesystemType).GetFilesystem(0x1d30dc0, 0x1421460, 0xc002574a80, 0xc00062c188, 0xc00091b800, 0xc0020dd000, 0x0, 0xc0020dd200, 0x1a, 0x0, ...)
	<autogenerated>:1 +0xc5 fp=0xc002f5d860 sp=0xc002f5d7e0 pc=0xf4e1e5
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountDisconnected(0xc00062c188, 0x1421460, 0xc002574a80, 0xc00091b800, 0xc0020dd000, 0x0, 0xc0020dcf00, 0x4, 0xc002f5dae8, 0x0, ...)
	pkg/sentry/vfs/mount.go:218 +0x15c fp=0xc002f5d930 sp=0xc002f5d860 pc=0x7e539c
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountAt(0xc00062c188, 0x1421460, 0xc002574a80, 0xc00091b800, 0xc0020dd000, 0x0, 0xc002f5db18, 0xc0020dcf00, 0x4, 0xc002f5dae8, ...)
	pkg/sentry/vfs/mount.go:306 +0xde fp=0xc002f5d9d0 sp=0xc002f5d930 pc=0x7e5ade
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Mount(0xc002574a80, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/vfs2/mount.go:141 +0x5d4 fp=0xc002f5db90 sp=0xc002f5d9d0 pc=0xe5efb4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc002574a80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x12886c0, ...)
	pkg/sentry/kernel/task_syscall.go:116 +0x1b9 fp=0xc002f5dc50 sp=0xc002f5db90 pc=0xa4d219
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc002574a80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x20000040, 0x0)
	pkg/sentry/kernel/task_syscall.go:291 +0x70 fp=0xc002f5dcd8 sp=0xc002f5dc50 pc=0xa4e4d0
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc002574a80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0xc0029a88e0, 0xc0029a8840)
	pkg/sentry/kernel/task_syscall.go:238 +0xb4 fp=0xc002f5dd38 sp=0xc002f5dcd8 pc=0xa4dfd4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc002574a80, 0x2, 0xc002574a80)
	pkg/sentry/kernel/task_syscall.go:205 +0x198 fp=0xc002f5de08 sp=0xc002f5dd38 pc=0xa4d8b8
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc002574a80, 0x13f3940, 0x0)
	pkg/sentry/kernel/task_run.go:327 +0xd95 fp=0xc002f5df60 sp=0xc002f5de08 pc=0xa40375
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc002574a80, 0x4d5)
	pkg/sentry/kernel/task_run.go:100 +0x1e2 fp=0xc002f5dfd0 sp=0xc002f5df60 pc=0xa3ee82
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc002f5dfd8 sp=0xc002f5dfd0 pc=0x470681
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:374 +0x116