panic: Incrementing non-positive ref count 0xc004bca5c0 owned by *mm.SpecialMappable

goroutine 240314 [running]:
panic(0x100bbc0, 0xc0001db530)
	GOROOT/src/runtime/panic.go:1064 +0x46d fp=0xc00734d448 sp=0xc00734d390 pc=0x43438d
gvisor.dev/gvisor/pkg/sentry/mm.(*SpecialMappableRefs).IncRef(0xc004bca5c0)
	bazel-out/k8-fastbuild/bin/pkg/sentry/mm/special_mappable_refs.go:83 +0xe0 fp=0xc00734d4b0 sp=0xc00734d448 pc=0x7dc240
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).Fork(0xc004387000, 0x1401f20, 0xc004792000, 0x0, 0x0, 0x0)
	pkg/sentry/mm/lifecycle.go:133 +0x6e5 fp=0xc00734d800 sp=0xc00734d4b0 pc=0x7c3605
gvisor.dev/gvisor/pkg/sentry/kernel.(*TaskContext).Fork(0xc0047927b8, 0x1401f20, 0xc004792000, 0xc0000de000, 0xc001ee0100, 0xc00734d8f8, 0x7f8998, 0x7fd257d089f0)
	pkg/sentry/kernel/task_context.go:101 +0x1ca fp=0xc00734d868 sp=0xc00734d800 pc=0x956a1a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Clone(0xc004792000, 0xc00734dae0, 0xc000000000, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_clone.go:252 +0x342 fp=0xc00734dab0 sp=0xc00734d868 pc=0x953ec2
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.clone(0xc004792000, 0x1200011, 0x0, 0x0, 0x169cc10, 0x169c940, 0xc00734dbc8, 0x47bc71, 0x78ef, 0xc00734dbc4)
	pkg/sentry/syscalls/linux/sys_thread.go:270 +0x165 fp=0xc00734db48 sp=0xc00734dab0 pc=0xa06c15
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Clone(0xc004792000, 0x1200011, 0x0, 0x0, 0x169cc10, 0x169c940, 0x0, 0xc00734dc14, 0xdcec58, 0x65, ...)
	pkg/sentry/syscalls/linux/sys_clone_amd64.go:37 +0xa3 fp=0xc00734dba8 sp=0xc00734db48 pc=0x9cf7a3
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc004792000, 0x38, 0x1200011, 0x0, 0x0, 0x169cc10, 0x169c940, 0x0, 0x0, 0x11f16e0, ...)
	pkg/sentry/kernel/task_syscall.go:117 +0x1b6 fp=0xc00734dc68 sp=0xc00734dba8 pc=0x971306
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc004792000, 0x38, 0x1200011, 0x0, 0x0, 0x169cc10, 0x169c940, 0x0, 0x169c940, 0x0)
	pkg/sentry/kernel/task_syscall.go:292 +0x70 fp=0xc00734dcf0 sp=0xc00734dc68 pc=0x9725f0
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc004792000, 0x38, 0x1200011, 0x0, 0x0, 0x169cc10, 0x169c940, 0x0, 0x13cfa01, 0x100000000000000)
	pkg/sentry/kernel/task_syscall.go:239 +0xb4 fp=0xc00734dd50 sp=0xc00734dcf0 pc=0x9720a4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc004792000, 0x2, 0xc004792000)
	pkg/sentry/kernel/task_syscall.go:206 +0x198 fp=0xc00734de10 sp=0xc00734dd50 pc=0x971988
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc004792000, 0x13cfa40, 0x0)
	pkg/sentry/kernel/task_run.go:321 +0xd88 fp=0xc00734df60 sp=0xc00734de10 pc=0x964918
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc004792000, 0x1f28)
	pkg/sentry/kernel/task_run.go:97 +0x1bd fp=0xc00734dfd0 sp=0xc00734df60 pc=0x96345d
runtime.goexit()
	src/runtime/asm_amd64.s:1373 +0x1 fp=0xc00734dfd8 sp=0xc00734dfd0 pc=0x467da1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:371 +0x112