panic: Incrementing non-positive ref count

goroutine 1887543 [running]:
gvisor.dev/gvisor/pkg/refs.(*AtomicRefCount).IncRef(...)
	pkg/refs/refcounter.go:370
gvisor.dev/gvisor/pkg/sentry/fs.(*Dirent).IncRef(...)
	pkg/sentry/fs/dirent.go:1309
gvisor.dev/gvisor/pkg/sentry/fs.(*Mount).Root(...)
	pkg/sentry/fs/mounts.go:106
gvisor.dev/gvisor/pkg/sentry/fs/proc.forEachMount(0xc001175500, 0xc0003f54b0)
	pkg/sentry/fs/proc/mounts.go:59 +0x356
gvisor.dev/gvisor/pkg/sentry/fs/proc.(*mountInfoFile).ReadSeqFileData(0xc000588290, 0xeab900, 0xc000e98000, 0x0, 0x0, 0xc00097e368, 0xc0002a8050, 0xea56a0, 0xc0002a8050)
	pkg/sentry/fs/proc/mounts.go:90 +0x7d
gvisor.dev/gvisor/pkg/sentry/fs/proc/seqfile.(*SeqFile).updateSourceLocked(0xc00097e340, 0xeab900, 0xc000e98000, 0x0)
	pkg/sentry/fs/proc/seqfile/seqfile.go:180 +0xa0
gvisor.dev/gvisor/pkg/sentry/fs/proc/seqfile.(*seqFileOperations).Read(0xc0005882b8, 0xeab900, 0xc000e98000, 0xc000f43130, 0xea96e0, 0xc000a58000, 0xc0008f8000, 0x3c1, 0x0, 0x1000, ...)
	pkg/sentry/fs/proc/seqfile/seqfile.go:229 +0xaf2
gvisor.dev/gvisor/pkg/sentry/fs.(*File).Readv(0xc000f43130, 0xeab900, 0xc000e98000, 0xea96e0, 0xc000a58000, 0xc0008f8000, 0x3c1, 0x0, 0x1000, 0x100, ...)
	pkg/sentry/fs/file.go:270 +0x1eb
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.readv(0xc000e98000, 0xc000f43130, 0xea96e0, 0xc000a58000, 0xc0008f8000, 0x3c1, 0x0, 0x1000, 0x100, 0x1000, ...)
	pkg/sentry/syscalls/linux/sys_read.go:257 +0x90
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Readv(0xc000e98000, 0x3, 0x20000580, 0x3c1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_read.go:148 +0x1c6
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000e98000, 0x13, 0x3, 0x20000580, 0x3c1, 0x0, 0x0, 0x0, 0xc001124d10, 0xc001124dc8, ...)
	pkg/sentry/kernel/task_syscall.go:165 +0x10a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000e98000, 0x13, 0x3, 0x20000580, 0x3c1, 0x0, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:283 +0x69
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000e98000, 0x13, 0x3, 0x20000580, 0x3c1, 0x0, 0x0, 0x0, 0xc00015acc0, 0xebaec0)
	pkg/sentry/kernel/task_syscall.go:244 +0x96
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000e98000, 0x2, 0xc000570c80)
	pkg/sentry/kernel/task_syscall.go:219 +0x13d
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc000e98000, 0xe91120, 0x0)
	pkg/sentry/kernel/task_run.go:219 +0xe09
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000e98000, 0xae1f)
	pkg/sentry/kernel/task_run.go:91 +0x194
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:286 +0xfe