panic: Decrementing non-positive ref count 0xc0153db800, owned by *mm.SpecialMappable

goroutine 425050 [running]:
panic(0x100aa40, 0xc02f518d60)
	GOROOT/src/runtime/panic.go:1064 +0x46d fp=0xc06798fcd8 sp=0xc06798fc20 pc=0x43438d
gvisor.dev/gvisor/pkg/sentry/mm.(*SpecialMappableRefs).DecRef(0xc0153db800, 0xc06798fd50)
	bazel-out/k8-fastbuild/bin/pkg/sentry/mm/special_mappable_refs.go:127 +0x10a fp=0xc06798fd40 sp=0xc06798fcd8 pc=0x7dc0aa
gvisor.dev/gvisor/pkg/sentry/mm.(*SpecialMappable).DecRef(0xc0153db800, 0x1400760, 0x1dfe180)
	pkg/sentry/mm/special_mappable.go:57 +0x5a fp=0xc06798fd70 sp=0xc06798fd40 pc=0x7db49a
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).removeVMAsLocked(0xc00b68c000, 0x1400760, 0x1dfe180, 0x10000, 0x7fffffff0000, 0x1243b68, 0xc02bd6f580)
	pkg/sentry/mm/vma.go:505 +0x3cd fp=0xc06798fdf8 sp=0xc06798fd70 pc=0x7e666d
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).unmapLocked(0xc00b68c000, 0x1400760, 0x1dfe180, 0x10000, 0x7fffffff0000, 0xc0813f0a80, 0xc0007e7e00)
	pkg/sentry/mm/vma.go:465 +0x8f fp=0xc06798fe40 sp=0xc06798fdf8 pc=0x7e626f
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).DecUsers(0xc00b68c000, 0x1400760, 0x1dfe180)
	pkg/sentry/mm/lifecycle.go:352 +0x23a fp=0xc06798fed0 sp=0xc06798fe40 pc=0x7c44ca
gvisor.dev/gvisor/pkg/sentry/kernel.(*TaskContext).release(0xc0813f1238)
	pkg/sentry/kernel/task_context.go:65 +0xa2 fp=0xc06798fef8 sp=0xc06798fed0 pc=0x955dd2
gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute(0x0, 0xc0813f0a80, 0x13ce500, 0x0)
	pkg/sentry/kernel/task_exit.go:306 +0x182 fp=0xc06798ff60 sp=0xc06798fef8 pc=0x958812
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0813f0a80, 0x30c7)
	pkg/sentry/kernel/task_run.go:97 +0x1bd fp=0xc06798ffd0 sp=0xc06798ff60 pc=0x9629fd
runtime.goexit()
	src/runtime/asm_amd64.s:1373 +0x1 fp=0xc06798ffd8 sp=0xc06798ffd0 pc=0x467da1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:370 +0x112