panic: Decrementing non-positive ref count 0xc0212363c0, owned by *mm.SpecialMappable

goroutine 359521 [running]:
panic(0x100bba0, 0xc000946020)
	GOROOT/src/runtime/panic.go:1064 +0x46d fp=0xc001e9bcd8 sp=0xc001e9bc20 pc=0x43438d
gvisor.dev/gvisor/pkg/sentry/mm.(*SpecialMappableRefs).DecRef(0xc0212363c0, 0xc001e9bd50)
	bazel-out/k8-fastbuild/bin/pkg/sentry/mm/special_mappable_refs.go:127 +0x10a fp=0xc001e9bd40 sp=0xc001e9bcd8 pc=0x7dc3ca
gvisor.dev/gvisor/pkg/sentry/mm.(*SpecialMappable).DecRef(0xc0212363c0, 0x1401f80, 0x1e013e0)
	pkg/sentry/mm/special_mappable.go:57 +0x5a fp=0xc001e9bd70 sp=0xc001e9bd40 pc=0x7db7ba
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).removeVMAsLocked(0xc007e55000, 0x1401f80, 0x1e013e0, 0x10000, 0x7fffffff0000, 0x1245338, 0xc000e7b500)
	pkg/sentry/mm/vma.go:505 +0x3cd fp=0xc001e9bdf8 sp=0xc001e9bd70 pc=0x7e698d
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).unmapLocked(0xc007e55000, 0x1401f80, 0x1e013e0, 0x10000, 0x7fffffff0000, 0xc001e9bec8, 0x13ec940)
	pkg/sentry/mm/vma.go:465 +0x8f fp=0xc001e9be40 sp=0xc001e9bdf8 pc=0x7e658f
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).DecUsers(0xc007e55000, 0x1401f80, 0x1e013e0)
	pkg/sentry/mm/lifecycle.go:352 +0x23a fp=0xc001e9bed0 sp=0xc001e9be40 pc=0x7c47ea
gvisor.dev/gvisor/pkg/sentry/kernel.(*TaskContext).release(0xc05760c7b8)
	pkg/sentry/kernel/task_context.go:65 +0xa2 fp=0xc001e9bef8 sp=0xc001e9bed0 pc=0x9567a2
gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute(0x0, 0xc05760c000, 0x13cfce0, 0x0)
	pkg/sentry/kernel/task_exit.go:306 +0x182 fp=0xc001e9bf60 sp=0xc001e9bef8 pc=0x9591e2
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc05760c000, 0x1871)
	pkg/sentry/kernel/task_run.go:97 +0x1bd fp=0xc001e9bfd0 sp=0xc001e9bf60 pc=0x9633ed
runtime.goexit()
	src/runtime/asm_amd64.s:1373 +0x1 fp=0xc001e9bfd8 sp=0xc001e9bfd0 pc=0x467da1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:371 +0x112