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

goroutine 151403 [running]:
panic({0x11ee280, 0x210cda0})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc0070a5360 sp=0xc0070a52a0 pc=0x436a3b
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc0070a53c0 sp=0xc0070a5360 pc=0x44e05d
gvisor.dev/gvisor/pkg/sentry/kernel.(*TTY).SignalForegroundProcessGroup(0xc00477b890, 0xc009b1730d?)
	pkg/sentry/kernel/tty.go:54 +0xa1 fp=0xc0070a5450 sp=0xc0070a53c0 pc=0x9d6041
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0xc009d34400, 0xc005fcc180, 0xc005fcc190, {0xc009b1730d?, 0xc0070a56e8?, 0xc0070a5734?})
	pkg/sentry/fsimpl/devpts/line_discipline.go:407 +0x445 fp=0xc0070a5680 sp=0xc0070a5450 pc=0xd6e3e5
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0xc005fcc190, 0x15e8f90?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0xce fp=0xc0070a56e8 sp=0xc0070a5680 pc=0xd7130e
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).setTermios(0xc005fcc180, 0x0?, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:153 +0x1a5 fp=0xc0070a5788 sp=0xc0070a56e8 pc=0xd6c8c5
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*masterFileDescription).Ioctl(0xc007bb1400, {0x15f5f58, 0xc006810a80}, {0x15f0490, 0xc007e8e000}, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, ...})
	pkg/sentry/fsimpl/devpts/master.go:159 +0x11f fp=0xc0070a5830 sp=0xc0070a5788 pc=0xd6f3bf
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Ioctl(...)
	pkg/sentry/vfs/file_description.go:707
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Ioctl(0xc006810a80, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_file.go:286 +0x503 fp=0xc0070a5930 sp=0xc0070a5830 pc=0xb22783
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc006810a80, 0x10, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x80b fp=0xc0070a5c70 sp=0xc0070a5930 pc=0x9cb66b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc006810a80, 0x85?, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x54 fp=0xc0070a5cd0 sp=0xc0070a5c70 pc=0x9ccc54
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0x8415cf?, 0x0?, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x85 fp=0xc0070a5d30 sp=0xc0070a5cd0 pc=0x9cc845
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00332fd40?)
	pkg/sentry/kernel/task_syscall.go:257 +0x3ac fp=0xc0070a5e28 sp=0xc0070a5d30 pc=0x9cc50c
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc007829f00?, 0xc006810a80)
	pkg/sentry/kernel/task_run.go:265 +0x144a fp=0xc0070a5f60 sp=0xc0070a5e28 pc=0x9be14a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc006810a80, 0x1714)
	pkg/sentry/kernel/task_run.go:94 +0x21c fp=0xc0070a5fc0 sp=0xc0070a5f60 pc=0x9bc65c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x2a fp=0xc0070a5fe0 sp=0xc0070a5fc0 pc=0x9c9aea
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0070a5fe8 sp=0xc0070a5fe0 pc=0x46d401
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0x105