panic: Decrementing non-positive ref count 0xc0004b4bc0, owned by *mm.SpecialMappable

goroutine 141488 [running]:
panic(0x100cc20, 0xc0000fe2e0)
	GOROOT/src/runtime/panic.go:1064 +0x46d fp=0xc002c3fcd8 sp=0xc002c3fc20 pc=0x43438d
gvisor.dev/gvisor/pkg/sentry/mm.(*SpecialMappableRefs).DecRef(0xc0004b4bc0, 0xc002c3fd50)
	bazel-out/k8-fastbuild/bin/pkg/sentry/mm/special_mappable_refs.go:127 +0x10a fp=0xc002c3fd40 sp=0xc002c3fcd8 pc=0x7dc6da
gvisor.dev/gvisor/pkg/sentry/mm.(*SpecialMappable).DecRef(0xc0004b4bc0, 0x14043a0, 0x1e045f0)
	pkg/sentry/mm/special_mappable.go:57 +0x5a fp=0xc002c3fd70 sp=0xc002c3fd40 pc=0x7dbaca
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).removeVMAsLocked(0xc0022a8000, 0x14043a0, 0x1e045f0, 0x10000, 0x7fffffff0000, 0x1246668, 0xc000cc23c0)
	pkg/sentry/mm/vma.go:505 +0x3cd fp=0xc002c3fdf8 sp=0xc002c3fd70 pc=0x7e6c9d
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).unmapLocked(0xc0022a8000, 0x14043a0, 0x1e045f0, 0x10000, 0x7fffffff0000, 0x0, 0x2080)
	pkg/sentry/mm/vma.go:465 +0x8f fp=0xc002c3fe40 sp=0xc002c3fdf8 pc=0x7e689f
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).DecUsers(0xc0022a8000, 0x14043a0, 0x1e045f0)
	pkg/sentry/mm/lifecycle.go:352 +0x23a fp=0xc002c3fed0 sp=0xc002c3fe40 pc=0x7c4afa
gvisor.dev/gvisor/pkg/sentry/kernel.(*TaskContext).release(0xc001195238)
	pkg/sentry/kernel/task_context.go:65 +0xa2 fp=0xc002c3fef8 sp=0xc002c3fed0 pc=0x956f62
gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute(0x0, 0xc001194a80, 0x13d20c0, 0x0)
	pkg/sentry/kernel/task_exit.go:306 +0x182 fp=0xc002c3ff60 sp=0xc002c3fef8 pc=0x9599a2
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc001194a80, 0xb11)
	pkg/sentry/kernel/task_run.go:97 +0x1bd fp=0xc002c3ffd0 sp=0xc002c3ff60 pc=0x963bad
runtime.goexit()
	src/runtime/asm_amd64.s:1373 +0x1 fp=0xc002c3ffd8 sp=0xc002c3ffd0 pc=0x467da1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:371 +0x112