panic: Decrementing non-positive ref count 0xc00c21bac0, owned by *mm.SpecialMappable

goroutine 227873 [running]:
panic(0x100cc00, 0xc0005ac060)
	GOROOT/src/runtime/panic.go:1064 +0x46d fp=0xc020957cd8 sp=0xc020957c20 pc=0x43438d
gvisor.dev/gvisor/pkg/sentry/mm.(*SpecialMappableRefs).DecRef(0xc00c21bac0, 0xc020957d50)
	bazel-out/k8-fastbuild/bin/pkg/sentry/mm/special_mappable_refs.go:127 +0x10a fp=0xc020957d40 sp=0xc020957cd8 pc=0x7dc3da
gvisor.dev/gvisor/pkg/sentry/mm.(*SpecialMappable).DecRef(0xc00c21bac0, 0x14042a0, 0x1e04570)
	pkg/sentry/mm/special_mappable.go:57 +0x5a fp=0xc020957d70 sp=0xc020957d40 pc=0x7db7ca
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).removeVMAsLocked(0xc02b1ff000, 0x14042a0, 0x1e04570, 0x10000, 0x7fffffff0000, 0x1246628, 0xc00cd67ac0)
	pkg/sentry/mm/vma.go:505 +0x3cd fp=0xc020957df8 sp=0xc020957d70 pc=0x7e699d
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).unmapLocked(0xc02b1ff000, 0x14042a0, 0x1e04570, 0x10000, 0x7fffffff0000, 0x44828e, 0xc00034c4e4)
	pkg/sentry/mm/vma.go:465 +0x8f fp=0xc020957e40 sp=0xc020957df8 pc=0x7e659f
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).DecUsers(0xc02b1ff000, 0x14042a0, 0x1e04570)
	pkg/sentry/mm/lifecycle.go:352 +0x23a fp=0xc020957ed0 sp=0xc020957e40 pc=0x7c47fa
gvisor.dev/gvisor/pkg/sentry/kernel.(*TaskContext).release(0xc02dbfa7b8)
	pkg/sentry/kernel/task_context.go:65 +0xa2 fp=0xc020957ef8 sp=0xc020957ed0 pc=0x956c62
gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute(0x0, 0xc02dbfa000, 0x13d1fa0, 0x0)
	pkg/sentry/kernel/task_exit.go:306 +0x182 fp=0xc020957f60 sp=0xc020957ef8 pc=0x9596a2
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc02dbfa000, 0xf85)
	pkg/sentry/kernel/task_run.go:97 +0x1bd fp=0xc020957fd0 sp=0xc020957f60 pc=0x9638ad
runtime.goexit()
	src/runtime/asm_amd64.s:1373 +0x1 fp=0xc020957fd8 sp=0xc020957fd0 pc=0x467da1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:371 +0x112