panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xa23126]

goroutine 1084152 [running]:
panic(0x11b09c0, 0x1e83670)
	GOROOT/src/runtime/panic.go:1065 +0x565 fp=0xc0070399f0 sp=0xc007039928 pc=0x437c65
runtime.panicmem()
	GOROOT/src/runtime/panic.go:212 +0x5b fp=0xc007039a10 sp=0xc0070399f0 pc=0x435cbb
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:734 +0x173 fp=0xc007039a48 sp=0xc007039a10 pc=0x44f993
gvisor.dev/gvisor/pkg/sentry/kernel.(*ThreadGroup).ProcessGroup(0x0, 0x0)
	pkg/sentry/kernel/sessions.go:599 +0x46 fp=0xc007039a78 sp=0xc007039a48 pc=0xa23126
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Kill(0xc01064aa80, 0xfffff476, 0x9, 0x839, 0x817feaa94f3194, 0x373a8491, 0x17da, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_signal.go:201 +0x4cd fp=0xc007039ba8 sp=0xc007039a78 pc=0xad5a6d
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc01064aa80, 0x3e, 0xfffff476, 0x9, 0x839, 0x817feaa94f3194, 0x373a8491, 0x17da, 0xf25f93, 0x134f660, ...)
	pkg/sentry/kernel/task_syscall.go:116 +0x1b9 fp=0xc007039c68 sp=0xc007039ba8 pc=0xa4a9b9
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc01064aa80, 0x3e, 0xfffff476, 0x9, 0x839, 0x817feaa94f3194, 0x373a8491, 0x17da, 0x373a8491, 0x17da)
	pkg/sentry/kernel/task_syscall.go:291 +0x70 fp=0xc007039cf0 sp=0xc007039c68 pc=0xa4bc90
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc01064aa80, 0x3e, 0xfffff476, 0x9, 0x839, 0x817feaa94f3194, 0x373a8491, 0x17da, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:238 +0xb4 fp=0xc007039d50 sp=0xc007039cf0 pc=0xa4b774
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc01064aa80, 0x2, 0xc01064aa80)
	pkg/sentry/kernel/task_syscall.go:205 +0x198 fp=0xc007039e20 sp=0xc007039d50 pc=0xa4b058
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc01064aa80, 0x14e0500, 0x0)
	pkg/sentry/kernel/task_run.go:327 +0xe1f fp=0xc007039f60 sp=0xc007039e20 pc=0xa3ddbf
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc01064aa80, 0x4e9e)
	pkg/sentry/kernel/task_run.go:100 +0x1e2 fp=0xc007039fd0 sp=0xc007039f60 pc=0xa3c842
runtime.goexit()
	src/runtime/asm_amd64.s:1371 +0x1 fp=0xc007039fd8 sp=0xc007039fd0 pc=0x472821
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:381 +0x116