panic: Decrementing non-positive ref count 0xc0877d89c0, owned by *mm.SpecialMappable

goroutine 100398 [running]:
panic(0x100bbc0, 0xc0005de000)
	GOROOT/src/runtime/panic.go:1064 +0x46d fp=0xc0ab0fbcd8 sp=0xc0ab0fbc20 pc=0x43438d
gvisor.dev/gvisor/pkg/sentry/mm.(*SpecialMappableRefs).DecRef(0xc0877d89c0, 0xc0ab0fbd50)
	bazel-out/k8-fastbuild/bin/pkg/sentry/mm/special_mappable_refs.go:127 +0x10a fp=0xc0ab0fbd40 sp=0xc0ab0fbcd8 pc=0x7dc3ca
gvisor.dev/gvisor/pkg/sentry/mm.(*SpecialMappable).DecRef(0xc0877d89c0, 0x1401d20, 0x1e01440)
	pkg/sentry/mm/special_mappable.go:57 +0x5a fp=0xc0ab0fbd70 sp=0xc0ab0fbd40 pc=0x7db7ba
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).removeVMAsLocked(0xc0baf88000, 0x1401d20, 0x1e01440, 0x10000, 0x7fffffff0000, 0x1245158, 0xc0857a6780)
	pkg/sentry/mm/vma.go:505 +0x3cd fp=0xc0ab0fbdf8 sp=0xc0ab0fbd70 pc=0x7e698d
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).unmapLocked(0xc0baf88000, 0x1401d20, 0x1e01440, 0x10000, 0x7fffffff0000, 0x44828e, 0xc0006141e4)
	pkg/sentry/mm/vma.go:465 +0x8f fp=0xc0ab0fbe40 sp=0xc0ab0fbdf8 pc=0x7e658f
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).DecUsers(0xc0baf88000, 0x1401d20, 0x1e01440)
	pkg/sentry/mm/lifecycle.go:352 +0x23a fp=0xc0ab0fbed0 sp=0xc0ab0fbe40 pc=0x7c47ea
gvisor.dev/gvisor/pkg/sentry/kernel.(*TaskContext).release(0xc0ba4ff238)
	pkg/sentry/kernel/task_context.go:65 +0xa2 fp=0xc0ab0fbef8 sp=0xc0ab0fbed0 pc=0x956812
gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute(0x0, 0xc0ba4fea80, 0x13cfa80, 0x0)
	pkg/sentry/kernel/task_exit.go:306 +0x182 fp=0xc0ab0fbf60 sp=0xc0ab0fbef8 pc=0x959252
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0ba4fea80, 0x6a0)
	pkg/sentry/kernel/task_run.go:97 +0x1bd fp=0xc0ab0fbfd0 sp=0xc0ab0fbf60 pc=0x96345d
runtime.goexit()
	src/runtime/asm_amd64.s:1373 +0x1 fp=0xc0ab0fbfd8 sp=0xc0ab0fbfd0 pc=0x467da1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:371 +0x112