panic: Incrementing non-positive ref count

goroutine 200248 [running]:
gvisor.dev/gvisor/pkg/refs.(*AtomicRefCount).IncRef(...)
	pkg/refs/refcounter.go:213
gvisor.dev/gvisor/pkg/sentry/fs.(*Dirent).IncRef(...)
	pkg/sentry/fs/dirent.go:1307
gvisor.dev/gvisor/pkg/sentry/fs.(*Mount).Root(...)
	pkg/sentry/fs/mounts.go:106
gvisor.dev/gvisor/pkg/sentry/fs/proc.forEachMount(0xc0014cd500, 0xc00148f4b0)
	pkg/sentry/fs/proc/mounts.go:59 +0x356
gvisor.dev/gvisor/pkg/sentry/fs/proc.(*mountsFile).ReadSeqFileData(0xc00215a2c0, 0xec3a20, 0xc0026aea80, 0x0, 0x0, 0xc001152c58, 0xc000257770, 0xebd940, 0xc000257770)
	pkg/sentry/fs/proc/mounts.go:174 +0x7d
gvisor.dev/gvisor/pkg/sentry/fs/proc/seqfile.(*SeqFile).updateSourceLocked(0xc001152c30, 0xec3a20, 0xc0026aea80, 0x0)
	pkg/sentry/fs/proc/seqfile/seqfile.go:180 +0xa0
gvisor.dev/gvisor/pkg/sentry/fs/proc/seqfile.(*seqFileOperations).Read(0xc00215a2d8, 0xec3a20, 0xc0026aea80, 0xc000a213b0, 0xec1800, 0xc000d1a000, 0x0, 0x1, 0x0, 0x0, ...)
	pkg/sentry/fs/proc/seqfile/seqfile.go:229 +0xaf2
gvisor.dev/gvisor/pkg/sentry/fs.(*File).Readv(0xc000a213b0, 0xec3a20, 0xc0026aea80, 0xec1800, 0xc000d1a000, 0x0, 0x1, 0x0, 0x0, 0x100, ...)
	pkg/sentry/fs/file.go:269 +0x1e2
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.readv(0xc0026aea80, 0xc000a213b0, 0xec1800, 0xc000d1a000, 0x0, 0x1, 0x0, 0x0, 0x100, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_read.go:257 +0x90
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Read(0xc0026aea80, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_read.go:71 +0x1cf
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0026aea80, 0x0, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc000652790, 0xc0010a6d30, ...)
	pkg/sentry/kernel/task_syscall.go:165 +0x10a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0026aea80, 0x0, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:283 +0x69
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0026aea80, 0x0, 0x3, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:244 +0x96
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0026aea80, 0x2, 0xc000a301c0)
	pkg/sentry/kernel/task_syscall.go:219 +0x13d
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0026aea80, 0xea9040, 0x0)
	pkg/sentry/kernel/task_run.go:219 +0xe09
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0026aea80, 0x1570)
	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