panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x9d6041]

goroutine 39521 [running]:
panic({0x11ee280, 0x210cda0})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc000dad360 sp=0xc000dad2a0 pc=0x436a3b
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc000dad3c0 sp=0xc000dad360 pc=0x44e05d
gvisor.dev/gvisor/pkg/sentry/kernel.(*TTY).SignalForegroundProcessGroup(0xc002c22120, 0xc00285e00c?)
	pkg/sentry/kernel/tty.go:54 +0xa1 fp=0xc000dad450 sp=0xc000dad3c0 pc=0x9d6041
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0x439d40, 0xc0016fe180, 0xc0016fe190, {0xc00285e000?, 0x406571?, 0xc000dad734?})
	pkg/sentry/fsimpl/devpts/line_discipline.go:407 +0x445 fp=0xc000dad680 sp=0xc000dad450 pc=0xd6e3e5
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0xc0016fe190, 0x15e8f90?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0xce fp=0xc000dad6e8 sp=0xc000dad680 pc=0xd7130e
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).setTermios(0xc0016fe180, 0xc000dad7d8?, {{0x3}, {0x5403}, {0x20000280}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:153 +0x1a5 fp=0xc000dad788 sp=0xc000dad6e8 pc=0xd6c8c5
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*replicaFileDescription).Ioctl(0xc0024cdf00, {0x15f5f58, 0xc00273aa80}, {0x15f0490, 0xc002ade000}, {{0x3}, {0x5403}, {0x20000280}, {0x0}, {0x0}, ...})
	pkg/sentry/fsimpl/devpts/replica.go:168 +0x336 fp=0xc000dad830 sp=0xc000dad788 pc=0xd72276
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Ioctl(...)
	pkg/sentry/vfs/file_description.go:707
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Ioctl(0xc00273aa80, {{0x3}, {0x5403}, {0x20000280}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_file.go:286 +0x503 fp=0xc000dad930 sp=0xc000dad830 pc=0xb22783
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00273aa80, 0x10, {{0x3}, {0x5403}, {0x20000280}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x80b fp=0xc000dadc70 sp=0xc000dad930 pc=0x9cb66b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00273aa80, 0x85?, {{0x3}, {0x5403}, {0x20000280}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x54 fp=0xc000dadcd0 sp=0xc000dadc70 pc=0x9ccc54
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000dadd78?, 0x9829e6?, {{0x3}, {0x5403}, {0x20000280}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x85 fp=0xc000dadd30 sp=0xc000dadcd0 pc=0x9cc845
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00222d2b0?)
	pkg/sentry/kernel/task_syscall.go:257 +0x3ac fp=0xc000dade28 sp=0xc000dadd30 pc=0x9cc50c
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc002ca0600?, 0xc00273aa80)
	pkg/sentry/kernel/task_run.go:265 +0x144a fp=0xc000dadf60 sp=0xc000dade28 pc=0x9be14a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00273aa80, 0x3e4)
	pkg/sentry/kernel/task_run.go:94 +0x21c fp=0xc000dadfc0 sp=0xc000dadf60 pc=0x9bc65c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x2a fp=0xc000dadfe0 sp=0xc000dadfc0 pc=0x9c9aea
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000dadfe8 sp=0xc000dadfe0 pc=0x46d401
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0x105