panic: Incrementing non-positive count 0xc0008421c0 on kernel.ProcessGroup

goroutine 1358 [running]:
panic(0x10a6f60, 0xc000720040)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc0006c5930 sp=0xc0006c5878 pc=0x437110
gvisor.dev/gvisor/pkg/sentry/kernel.(*ProcessGroupRefs).IncRef(0xc0008421c0)
	bazel-out/k8-fastbuild-ST-3bfd66f45e612c1a5c797474a25664e227d81bf914f3b08a40e00b2e2692afa4/bin/pkg/sentry/kernel/process_group_refs.go:82 +0x18c fp=0xc0006c59a8 sp=0xc0006c5930 pc=0xa127ac
gvisor.dev/gvisor/pkg/sentry/kernel.(*ProcessGroup).incRefWithParent(0xc0008421c0, 0xc000752000)
	pkg/sentry/kernel/sessions.go:154 +0x68 fp=0xc0006c59c0 sp=0xc0006c59a8 pc=0xa1de88
gvisor.dev/gvisor/pkg/sentry/kernel.(*ThreadGroup).CreateProcessGroup.func1(0xc000216000)
	pkg/sentry/kernel/sessions.go:483 +0x4e fp=0xc0006c59e8 sp=0xc0006c59c0 pc=0xa6558e
gvisor.dev/gvisor/pkg/sentry/kernel.(*ThreadGroup).forEachChildThreadGroupLocked(0xc00065d000, 0xc0006c5ac8)
	pkg/sentry/kernel/thread_group.go:356 +0xa4 fp=0xc0006c5a78 sp=0xc0006c59e8 pc=0xa4b604
gvisor.dev/gvisor/pkg/sentry/kernel.(*ThreadGroup).CreateProcessGroup(0xc00065d000, 0x0, 0x0)
	pkg/sentry/kernel/sessions.go:481 +0x371 fp=0xc0006c5b00 sp=0xc0006c5a78 pc=0xa1ee71
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Setpgid(0xc0009ee000, 0xc, 0x0, 0x434c49, 0x0, 0x1, 0x1, 0xc, 0xc0004c4b60, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_thread.go:784 +0x105 fp=0xc0006c5b90 sp=0xc0006c5b00 pc=0xae0585
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0009ee000, 0x6d, 0xc, 0x0, 0x434c49, 0x0, 0x1, 0x1, 0xc000043800, 0x127d7c0, ...)
	pkg/sentry/kernel/task_syscall.go:116 +0x1b9 fp=0xc0006c5c50 sp=0xc0006c5b90 pc=0xa45b99
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0009ee000, 0x6d, 0xc, 0x0, 0x434c49, 0x0, 0x1, 0x1, 0x1, 0x1)
	pkg/sentry/kernel/task_syscall.go:291 +0x70 fp=0xc0006c5cd8 sp=0xc0006c5c50 pc=0xa46e50
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0009ee000, 0x6d, 0xc, 0x0, 0x434c49, 0x0, 0x1, 0x1, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:238 +0xb4 fp=0xc0006c5d38 sp=0xc0006c5cd8 pc=0xa46954
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0009ee000, 0x2, 0xc0009ee000)
	pkg/sentry/kernel/task_syscall.go:205 +0x198 fp=0xc0006c5e08 sp=0xc0006c5d38 pc=0xa46238
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0009ee000, 0x13e8e20, 0x0)
	pkg/sentry/kernel/task_run.go:327 +0xd95 fp=0xc0006c5f60 sp=0xc0006c5e08 pc=0xa38cf5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0009ee000, 0x29)
	pkg/sentry/kernel/task_run.go:100 +0x1e2 fp=0xc0006c5fd0 sp=0xc0006c5f60 pc=0xa37802
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc0006c5fd8 sp=0xc0006c5fd0 pc=0x470681
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:374 +0x116