panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x579cd0]

goroutine 492478 [running]:
panic({0xcc4e20, 0x1c0ee20})
	GOROOT/src/runtime/panic.go:987 +0x3ac fp=0x4001f112f0 sp=0x4001f11230 pc=0x450ac
runtime.panicmem()
	GOROOT/src/runtime/panic.go:260 +0x48 fp=0x4001f11310 sp=0x4001f112f0 pc=0x43a28
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x214 fp=0x4001f11350 sp=0x4001f11310 pc=0x5c7f4
gvisor.dev/gvisor/pkg/sentry/kernel.(*TTY).SignalForegroundProcessGroup(0x40064a3080, 0x4006f22077?)
	pkg/sentry/kernel/tty.go:54 +0x80 fp=0x4001f113f0 sp=0x4001f11360 pc=0x579cd0
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0x4001f11630, 0x4006f20000, 0x4006f20010, {0x4006f22067?, 0x4001f11678?, 0x15720?})
	pkg/sentry/fsimpl/devpts/line_discipline.go:407 +0x39c fp=0x4001f11620 sp=0x4001f113f0 pc=0x8b46ac
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0x4006f20010, 0x10d84c0?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0xe8 fp=0x4001f11690 sp=0x4001f11620 pc=0x8b7068
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).setTermios(0x4006f20000, 0x409858?, {{0x3}, {0x5403}, {0x20000080}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:153 +0x158 fp=0x4001f11730 sp=0x4001f11690 pc=0x8b2df8
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*masterFileDescription).Ioctl(0x400098a700, {0x10e5338, 0x4006db6a80}, {0x10dfbe8, 0x4006ee6000}, {{0x3}, {0x5403}, {0x20000080}, {0x0}, {0x0}, ...})
	pkg/sentry/fsimpl/devpts/master.go:159 +0xd4 fp=0x4001f117e0 sp=0x4001f11730 pc=0x8b5504
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Ioctl(...)
	pkg/sentry/vfs/file_description.go:707
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Ioctl(0x4006db6a80, {{0x3}, {0x5403}, {0x20000080}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_file.go:286 +0x3a0 fp=0x4001f118f0 sp=0x4001f117e0 pc=0x6a68e0
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0x4006db6a80, 0x1d, {{0x3}, {0x5403}, {0x20000080}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x678 fp=0x4001f11c30 sp=0x4001f118f0 pc=0x570318
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0x4006db6a80, 0x0?, {{0x3}, {0x5403}, {0x20000080}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x48 fp=0x4001f11c90 sp=0x4001f11c30 pc=0x5715f8
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0x4001f11d48?, 0x52e478?, {{0x3}, {0x5403}, {0x20000080}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x7c fp=0x4001f11cf0 sp=0x4001f11c90 pc=0x5711fc
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0x40096f6410?)
	pkg/sentry/kernel/task_syscall.go:257 +0x330 fp=0x4001f11df0 sp=0x4001f11cf0 pc=0x570f20
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x400098a680?, 0x4006db6a80)
	pkg/sentry/kernel/task_run.go:265 +0x1170 fp=0x4001f11f40 sp=0x4001f11df0 pc=0x564200
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0x4006db6a80, 0x2a7c)
	pkg/sentry/kernel/task_run.go:94 +0x208 fp=0x4001f11fb0 sp=0x4001f11f40 pc=0x562a58
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x2c fp=0x4001f11fd0 sp=0x4001f11fb0 pc=0x56ea4c
runtime.goexit()
	src/runtime/asm_arm64.s:1172 +0x4 fp=0x4001f11fd0 sp=0x4001f11fd0 pc=0x7a444
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0xf8