panic: Incrementing non-positive count 0xc002721b88 on tmpfs.inode

goroutine 186 [running]:
panic({0x10f2ce0?, 0xc01a42cbe0?})
	GOROOT/src/runtime/panic.go:1017 +0x3ac fp=0xc00100d500 sp=0xc00100d450 pc=0x43a72c
gvisor.dev/gvisor/pkg/sentry/fsimpl/tmpfs.(*inodeRefs).IncRef(0xc002721b88)
	bazel-out/k8-fastbuild/bin/pkg/sentry/fsimpl/tmpfs/inode_refs.go:81 +0x119 fp=0xc00100d568 sp=0xc00100d500 pc=0x90f859
gvisor.dev/gvisor/pkg/sentry/fsimpl/tmpfs.(*inode).incRef(...)
	pkg/sentry/fsimpl/tmpfs/tmpfs.go:591
gvisor.dev/gvisor/pkg/sentry/fsimpl/tmpfs.(*dentry).IncRef(...)
	pkg/sentry/fsimpl/tmpfs/tmpfs.go:447
gvisor.dev/gvisor/pkg/sentry/fsimpl/tmpfs.(*filesystem).GetDentryAt(0xc00021d6d8?, {0x1580618, 0xc000b3a000}, 0xc0053d6900, {0xe0?})
	pkg/sentry/fsimpl/tmpfs/filesystem.go:256 +0x216 fp=0xc00100d5d8 sp=0xc00100d568 pc=0x9075b6
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).GetDentryAt(0x40?, {0x1580618, 0xc000b3a000}, 0xd?, 0xc00100d678?, 0xc00100d677)
	pkg/sentry/vfs/vfs.go:263 +0x9f fp=0xc00100d640 sp=0xc00100d5d8 pc=0x7ab1bf
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).getMountpoint(0xc000ba6210?, {0x1580618, 0xc000b3a000}, 0xc000907588?, 0xc000ba6210?)
	pkg/sentry/vfs/mount.go:909 +0x3f fp=0xc00100d6a8 sp=0xc00100d640 pc=0x79abff
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).UmountAt(0xc00021d6d8, {0x1580618, 0xc000b3a000}, 0xc000644400?, 0xc010371b00?, 0xc00100d804)
	pkg/sentry/vfs/mount.go:571 +0xdd fp=0xc00100d778 sp=0xc00100d6a8 pc=0x79931d
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Umount2(0xc000b3a000, 0x0?, {{0x7f84256f1500}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_mount.go:164 +0x2f7 fp=0xc00100d910 sp=0xc00100d778 pc=0xb94957
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000b3a000, 0xa6, {{0x7f84256f1500}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x80b fp=0xc00100dc50 sp=0xc00100d910 pc=0xa2298b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000b3a000, 0xc00f8442d0?, {{0x7f84256f1500}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x4e fp=0xc00100dcb0 sp=0xc00100dc50 pc=0xa23f8e
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0x0?, 0xc000995200?, {{0x7f84256f1500}, {0xa}, {0x0}, {0xffffffff}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x74 fp=0xc00100dd10 sp=0xc00100dcb0 pc=0xa23b54
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0008db380?)
	pkg/sentry/kernel/task_syscall.go:257 +0x3a8 fp=0xc00100de08 sp=0xc00100dd10 pc=0xa23848
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000b3a000?, 0xc000b3a000)
	pkg/sentry/kernel/task_run.go:269 +0x1405 fp=0xc00100df48 sp=0xc00100de08 pc=0xa15945
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000b3a000, 0x1c)
	pkg/sentry/kernel/task_run.go:98 +0x262 fp=0xc00100dfc0 sp=0xc00100df48 pc=0xa13e62
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:391 +0x25 fp=0xc00100dfe0 sp=0xc00100dfc0 pc=0xa20e85
runtime.goexit()
	src/runtime/asm_amd64.s:1650 +0x1 fp=0xc00100dfe8 sp=0xc00100dfe0 pc=0x471241
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 243
	pkg/sentry/kernel/task_start.go:391 +0xf8