panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x1a92ed7]

goroutine 170 [running]:
panic({0x3192a0, 0x26473b0})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc0006d0d50 sp=0xc0006d0c90 pc=0x125ecbb
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc0006d0db0 sp=0xc0006d0d50 pc=0x1277b7d
gvisor.dev/gvisor/pkg/sentry/kernel.(*ProcessGroup).SendSignal(0x0, 0xc0006d1080)
	pkg/sentry/kernel/sessions.go:237 +0x57 fp=0xc0006d0f00 sp=0xc0006d0db0 pc=0x1a92ed7
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0x24, 0xc00002e000, 0xc00002e010, {0xc0004345b6, 0x4a, 0x4a})
	pkg/sentry/fsimpl/devpts/line_discipline.go:400 +0x416 fp=0xc0006d1158 sp=0xc0006d0f00 pc=0x1ffccb6
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0xc00002e010, 0x80cb90?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0x19f fp=0xc0006d1208 sp=0xc0006d1158 pc=0x2000ebf
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).setTermios(0xc00002e000, 0x2?, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:150 +0x26a fp=0xc0006d12c0 sp=0xc0006d1208 pc=0x1ffaf0a
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*masterFileDescription).Ioctl(0xc0004dc300, {0x819e98, 0xc000778a80}, {0x814150, 0xc000914000}, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, ...})
	pkg/sentry/fsimpl/devpts/master.go:159 +0x185 fp=0xc0006d1368 sp=0xc0006d12c0 pc=0x1ffe5c5
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Ioctl(...)
	pkg/sentry/vfs/file_description.go:707
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Ioctl(0xc000778a80, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_file.go:286 +0x582 fp=0xc0006d14d8 sp=0xc0006d1368 pc=0x1cb7662
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000778a80, 0x10, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x9b9 fp=0xc0006d19b8 sp=0xc0006d14d8 pc=0x1ad3f19
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000778a80, 0x0?, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x7d fp=0xc0006d1a50 sp=0xc0006d19b8 pc=0x1ad5cfd
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc00041f6c0?, 0xc0007760f0?, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x8f fp=0xc0006d1ac8 sp=0xc0006d1a50 pc=0x1ad56af
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000778a80)
	pkg/sentry/kernel/task_syscall.go:257 +0x4c5 fp=0xc0006d1bf0 sp=0xc0006d1ac8 pc=0x1ad5245
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000778a80?, 0xc000778a80)
	pkg/sentry/kernel/task_run.go:265 +0x1d4b fp=0xc0006d1ec8 sp=0xc0006d1bf0 pc=0x1abfc8b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000778a80, 0xd)
	pkg/sentry/kernel/task_run.go:94 +0x36b fp=0xc0006d1fb0 sp=0xc0006d1ec8 pc=0x1abd5ab
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x48 fp=0xc0006d1fe0 sp=0xc0006d1fb0 pc=0x1ad1a28
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0006d1fe8 sp=0xc0006d1fe0 pc=0x1297b61
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0x1ad