panic: Incrementing non-positive count 0xc000792ac0 on kernel.ProcessGroup

goroutine 685 [running]:
panic(0x10adbe0, 0xc000632410)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc000b01930 sp=0xc000b01878 pc=0x437110
gvisor.dev/gvisor/pkg/sentry/kernel.(*ProcessGroupRefs).IncRef(0xc000792ac0)
	bazel-out/k8-fastbuild-ST-3bfd66f45e612c1a5c797474a25664e227d81bf914f3b08a40e00b2e2692afa4/bin/pkg/sentry/kernel/process_group_refs.go:82 +0x18c fp=0xc000b019a8 sp=0xc000b01930 pc=0xa157ac
gvisor.dev/gvisor/pkg/sentry/kernel.(*ProcessGroup).incRefWithParent(0xc000792ac0, 0xc000467140)
	pkg/sentry/kernel/sessions.go:154 +0x68 fp=0xc000b019c0 sp=0xc000b019a8 pc=0xa20e88
gvisor.dev/gvisor/pkg/sentry/kernel.(*ThreadGroup).CreateProcessGroup.func1(0xc00036b800)
	pkg/sentry/kernel/sessions.go:483 +0x4e fp=0xc000b019e8 sp=0xc000b019c0 pc=0xa6862e
gvisor.dev/gvisor/pkg/sentry/kernel.(*ThreadGroup).forEachChildThreadGroupLocked(0xc00036b000, 0xc000b01ac8)
	pkg/sentry/kernel/thread_group.go:356 +0xa4 fp=0xc000b01a78 sp=0xc000b019e8 pc=0xa4e604
gvisor.dev/gvisor/pkg/sentry/kernel.(*ThreadGroup).CreateProcessGroup(0xc00036b000, 0x0, 0x0)
	pkg/sentry/kernel/sessions.go:481 +0x371 fp=0xc000b01b00 sp=0xc000b01a78 pc=0xa21e71
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Setpgid(0xc000853500, 0x18, 0x0, 0x434c49, 0x0, 0x1, 0x1, 0x0, 0x857f00718218, 0xc000b01c60, ...)
	pkg/sentry/syscalls/linux/sys_thread.go:784 +0x105 fp=0xc000b01b90 sp=0xc000b01b00 pc=0xae36e5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000853500, 0x6d, 0x18, 0x0, 0x434c49, 0x0, 0x1, 0x1, 0x0, 0x1286d40, ...)
	pkg/sentry/kernel/task_syscall.go:116 +0x1b9 fp=0xc000b01c50 sp=0xc000b01b90 pc=0xa48b99
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000853500, 0x6d, 0x18, 0x0, 0x434c49, 0x0, 0x1, 0x1, 0x1, 0x1)
	pkg/sentry/kernel/task_syscall.go:291 +0x70 fp=0xc000b01cd8 sp=0xc000b01c50 pc=0xa49e50
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000853500, 0x6d, 0x18, 0x0, 0x434c49, 0x0, 0x1, 0x1, 0xc0007aea60, 0xc0007ae9c0)
	pkg/sentry/kernel/task_syscall.go:238 +0xb4 fp=0xc000b01d38 sp=0xc000b01cd8 pc=0xa49954
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000853500, 0x2, 0xc000853500)
	pkg/sentry/kernel/task_syscall.go:205 +0x198 fp=0xc000b01e08 sp=0xc000b01d38 pc=0xa49238
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc000853500, 0x13f2600, 0x0)
	pkg/sentry/kernel/task_run.go:327 +0xd95 fp=0xc000b01f60 sp=0xc000b01e08 pc=0xa3bcf5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000853500, 0x27)
	pkg/sentry/kernel/task_run.go:100 +0x1e2 fp=0xc000b01fd0 sp=0xc000b01f60 pc=0xa3a802
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc000b01fd8 sp=0xc000b01fd0 pc=0x470681
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:374 +0x116