panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0x99ed1a]

goroutine 149 [running]:
panic({0x11ef240, 0x210de40})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc0008c7310 sp=0xc0008c7250 pc=0x436a3b
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc0008c7370 sp=0xc0008c7310 pc=0x44e05d
gvisor.dev/gvisor/pkg/sentry/kernel.(*ProcessGroup).SendSignal(0x0, 0xc0008c75e0)
	pkg/sentry/kernel/sessions.go:237 +0x5a fp=0xc0008c7460 sp=0xc0008c7370 pc=0x99ed1a
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0xb, 0xc0003a8180, 0xc0003a8190, {0xc000a207b6?, 0x15da5c0?, 0xc0008c7744?})
	pkg/sentry/fsimpl/devpts/line_discipline.go:400 +0x445 fp=0xc0008c7690 sp=0xc0008c7460 pc=0xd6e1c5
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0xc0003a8190, 0x15ea050?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0xce fp=0xc0008c76f8 sp=0xc0008c7690 pc=0xd7104e
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).setTermios(0xc0003a8180, 0x15f7018?, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:150 +0x1a5 fp=0xc0008c7798 sp=0xc0008c76f8 pc=0xd6c6a5
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*masterFileDescription).Ioctl(0xc000a2a380, {0x15f7018, 0xc00067c000}, {0x15f1550, 0xc000a3d000}, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, ...})
	pkg/sentry/fsimpl/devpts/master.go:159 +0x11f fp=0xc0008c7830 sp=0xc0008c7798 pc=0xd6f19f
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Ioctl(...)
	pkg/sentry/vfs/file_description.go:707
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Ioctl(0xc00067c000, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_file.go:286 +0x503 fp=0xc0008c7930 sp=0xc0008c7830 pc=0xb224c3
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00067c000, 0x10, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x80b fp=0xc0008c7c70 sp=0xc0008c7930 pc=0x9cb66b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00067c000, 0x0?, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x54 fp=0xc0008c7cd0 sp=0xc0008c7c70 pc=0x9ccc54
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0003de310?, 0xc0008c7e18?, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x85 fp=0xc0008c7d30 sp=0xc0008c7cd0 pc=0x9cc845
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00081a420?)
	pkg/sentry/kernel/task_syscall.go:257 +0x3ac fp=0xc0008c7e28 sp=0xc0008c7d30 pc=0x9cc50c
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000a2a180?, 0xc00067c000)
	pkg/sentry/kernel/task_run.go:265 +0x144a fp=0xc0008c7f60 sp=0xc0008c7e28 pc=0x9be14a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00067c000, 0x1c)
	pkg/sentry/kernel/task_run.go:94 +0x21c fp=0xc0008c7fc0 sp=0xc0008c7f60 pc=0x9bc65c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x2a fp=0xc0008c7fe0 sp=0xc0008c7fc0 pc=0x9c9aea
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0008c7fe8 sp=0xc0008c7fe0 pc=0x46d401
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0x105