panic: Decrementing non-positive ref count 0xc0084e1a80, owned by kernel.ProcessGroup

goroutine 421 [running]:
panic({0xfe33a0, 0xc005cf0690})
	GOROOT/src/runtime/panic.go:941 +0x397 fp=0xc0005d3408 sp=0xc0005d3348 pc=0x435837
gvisor.dev/gvisor/pkg/sentry/kernel.(*ProcessGroupRefs).DecRef(0xc0084e1a80, 0x3?)
	bazel-out/k8-fastbuild-ST-246649c541f7/bin/pkg/sentry/kernel/process_group_refs.go:125 +0x16a fp=0xc0005d3470 sp=0xc0005d3408 pc=0x9f15aa
gvisor.dev/gvisor/pkg/sentry/kernel.(*ProcessGroup).decRefWithParent(0xc0084e1a80, 0xc0001c89c0?)
	pkg/sentry/kernel/sessions.go:159 +0x8d fp=0xc0005d34b0 sp=0xc0005d3470 pc=0x9fdf2d
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).exitNotifyLocked(0xc004f63500, 0x0)
	pkg/sentry/kernel/task_exit.go:714 +0x97b fp=0xc0005d3560 sp=0xc0005d34b0 pc=0xa1309b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).waitCollectZombieLocked(0xc000b35500, 0xc004f63500, 0xc0005d38e0, 0x0?)
	pkg/sentry/kernel/task_exit.go:1109 +0x435 fp=0xc0005d35a8 sp=0xc0005d3560 pc=0xa14dd5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).waitParentLocked(0x203000?, 0xc0005d38e0, 0xc000b35500)
	pkg/sentry/kernel/task_exit.go:977 +0x131 fp=0xc0005d3668 sp=0xc0005d35a8 pc=0xa144b1
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).waitOnce(0xc000b35500, 0xc0005d38e0)
	pkg/sentry/kernel/task_exit.go:944 +0x225 fp=0xc0005d36d0 sp=0xc0005d3668 pc=0xa14285
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Wait(0xa07630?, 0xc0005d3800?)
	pkg/sentry/kernel/task_exit.go:917 +0x1ca fp=0xc0005d3790 sp=0xc0005d36d0 pc=0xa13dea
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.wait4(0xc000b35500, 0x0?, 0x7f6fc663261c, 0x40000001, 0x0)
	pkg/sentry/syscalls/linux/sys_thread.go:288 +0x1b4 fp=0xc0005d3920 sp=0xc0005d3790 pc=0xad4294
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Wait4(0x0?, {{0xffffffff}, {0x7f6fc663261c}, {0x40000001}, {0x0}, {0x2af35c79}, {0x800}})
	pkg/sentry/syscalls/linux/sys_thread.go:316 +0x5e fp=0xc0005d3958 sp=0xc0005d3920 pc=0xad455e
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000b35500, 0x3d, {{0xffffffff}, {0x7f6fc663261c}, {0x40000001}, {0x0}, {0x2af35c79}, {0x800}})
	pkg/sentry/kernel/task_syscall.go:142 +0x80b fp=0xc0005d3c98 sp=0xc0005d3958 pc=0xa2b4eb
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000b35500, 0x85?, {{0xffffffff}, {0x7f6fc663261c}, {0x40000001}, {0x0}, {0x2af35c79}, {0x800}})
	pkg/sentry/kernel/task_syscall.go:322 +0x54 fp=0xc0005d3cf8 sp=0xc0005d3c98 pc=0xa2cad4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0x8bf92f?, 0x0?, {{0xffffffff}, {0x7f6fc663261c}, {0x40000001}, {0x0}, {0x2af35c79}, {0x800}})
	pkg/sentry/kernel/task_syscall.go:282 +0x85 fp=0xc0005d3d58 sp=0xc0005d3cf8 pc=0xa2c6c5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000d30270?)
	pkg/sentry/kernel/task_syscall.go:257 +0x3ac fp=0xc0005d3e50 sp=0xc0005d3d58 pc=0xa2c38c
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000b35500?, 0xc000b35500)
	pkg/sentry/kernel/task_run.go:253 +0x1125 fp=0xc0005d3f60 sp=0xc0005d3e50 pc=0xa1e105
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000b35500, 0x28)
	pkg/sentry/kernel/task_run.go:94 +0x1ec fp=0xc0005d3fc0 sp=0xc0005d3f60 pc=0xa1c94c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:380 +0x2a fp=0xc0005d3fe0 sp=0xc0005d3fc0 pc=0xa2998a
runtime.goexit()
	src/runtime/asm_amd64.s:1571 +0x1 fp=0xc0005d3fe8 sp=0xc0005d3fe0 pc=0x4693c1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:380 +0x105