panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xaeb778]

goroutine 77959 [running]:
panic(0x1117ee0, 0x1d20d20)
	GOROOT/src/runtime/panic.go:1064 +0x545 fp=0xc00344dad0 sp=0xc00344da08 pc=0x437265
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:212
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:742 +0x413 fp=0xc00344db00 sp=0xc00344dad0 pc=0x44e093
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).ThreadGroup(...)
	pkg/sentry/kernel/threads.go:501
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Setpgid(0xc00740aa80, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_thread.go:757 +0x538 fp=0xc00344db90 sp=0xc00344db00 pc=0xaeb778
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00740aa80, 0x6d, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x12a4880, ...)
	pkg/sentry/kernel/task_syscall.go:116 +0x1b9 fp=0xc00344dc50 sp=0xc00344db90 pc=0xa4ff99
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00740aa80, 0x6d, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:291 +0x70 fp=0xc00344dcd8 sp=0xc00344dc50 pc=0xa51250
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc00740aa80, 0x6d, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:238 +0xb4 fp=0xc00344dd38 sp=0xc00344dcd8 pc=0xa50d54
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00740aa80, 0x2, 0xc00740aa80)
	pkg/sentry/kernel/task_syscall.go:205 +0x198 fp=0xc00344de08 sp=0xc00344dd38 pc=0xa50638
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc00740aa80, 0x1411220, 0x0)
	pkg/sentry/kernel/task_run.go:327 +0xd95 fp=0xc00344df60 sp=0xc00344de08 pc=0xa430f5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00740aa80, 0xb2f)
	pkg/sentry/kernel/task_run.go:100 +0x1e2 fp=0xc00344dfd0 sp=0xc00344df60 pc=0xa41c02
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc00344dfd8 sp=0xc00344dfd0 pc=0x4709a1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:374 +0x116