panic: Decrementing non-positive ref count

goroutine 7682 [running]:
gvisor.googlesource.com/gvisor/pkg/refs.(*AtomicRefCount).DecRefWithDestructor(0xc42018e480, 0xc42061f8d8)
	pkg/refs/refcounter.go:271 +0x1d9
gvisor.googlesource.com/gvisor/pkg/sentry/kernel/shm.(*Shm).DecRef(0xc42018e480)
	pkg/sentry/kernel/shm/shm.go:377 +0x7a
gvisor.googlesource.com/gvisor/pkg/sentry/kernel/shm.(*Shm).MarkDestroyed(0xc42018e480)
	pkg/sentry/kernel/shm/shm.go:596 +0xb1
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Shmctl(0xc42047f600, 0xe, 0x0, 0x0, 0x0, 0x0, 0x0, 0x47c9be, 0xc42061fa88, 0x42f404, ...)
	pkg/sentry/syscalls/linux/sys_shm.go:143 +0x4aa
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc42047f600, 0x1f, 0xe, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/kernel/task_syscall.go:162 +0x14f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc42047f600, 0x1f, 0xe, 0x0, 0x0, 0x0, 0x0, 0x0, 0xe, 0x46155c)
	pkg/sentry/kernel/task_syscall.go:280 +0x7e
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc42047f600, 0x1f, 0xe, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc420350220, 0xc42061fc68)
	pkg/sentry/kernel/task_syscall.go:241 +0xc4
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc42047f600, 0x2, 0xc4204e0c60)
	pkg/sentry/kernel/task_syscall.go:216 +0x19f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc42047f600, 0x10bc5a0, 0x0)
	pkg/sentry/kernel/task_run.go:219 +0x1502
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc42047f600, 0x5a)
	pkg/sentry/kernel/task_run.go:95 +0x265
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:258 +0x194