panic: runtime error: index out of range

goroutine 486206 [running]:
unicode/utf8.EncodeRune(0xc000820478, 0x1, 0x8, 0xc0000000bb, 0x1)
	GOROOT/src/unicode/utf8/utf8.go:346 +0x29f
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*outputQueueTransformer).transform(0x23e9c70, 0xc0006726e0, 0xc000672748, 0xc000e8c0a1, 0x16, 0x16, 0xc00053e040)
	pkg/sentry/fs/tty/line_discipline.go:325 +0x38a
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*queue).pushWaitBufLocked(0xc000672748, 0xc0006726e0, 0xc000eb6000)
	pkg/sentry/fs/tty/queue.go:227 +0x193
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*queue).write(0xc000672748, 0x12d1200, 0xc000eb6000, 0x12d0300, 0xc000867100, 0x0, 0x1, 0x20000080, 0x17, 0x100, ...)
	pkg/sentry/fs/tty/queue.go:187 +0x1d3
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*lineDiscipline).outputQueueWrite(0xc0006726e0, 0x12d1200, 0xc000eb6000, 0x12d0300, 0xc000867100, 0x0, 0x1, 0x20000080, 0x17, 0x100, ...)
	pkg/sentry/fs/tty/line_discipline.go:240 +0x148
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*slaveFileOperations).Write(0xc000c98128, 0x12d1200, 0xc000eb6000, 0xc0022bca20, 0x12d0300, 0xc000867100, 0x0, 0x1, 0x20000080, 0x17, ...)
	pkg/sentry/fs/tty/slave.go:125 +0x13b
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).Writev(0xc0022bca20, 0x12d1200, 0xc000eb6000, 0x12d0300, 0xc000867100, 0x0, 0x1, 0x20000080, 0x17, 0x100, ...)
	pkg/sentry/fs/file.go:314 +0x1fd
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.writev(0xc000eb6000, 0xc0022bca20, 0x12d0300, 0xc000867100, 0x0, 0x1, 0x20000080, 0x17, 0x100, 0x17, ...)
	pkg/sentry/syscalls/linux/sys_write.go:261 +0xe1
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Write(0xc000eb6000, 0x4, 0x20000080, 0x17, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_write.go:71 +0x294
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000eb6000, 0x1, 0x4, 0x20000080, 0x17, 0x0, 0x0, 0x0, 0x465c01, 0xc000eb67d8, ...)
	pkg/sentry/kernel/task_syscall.go:165 +0x408
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000eb6000, 0x1, 0x4, 0x20000080, 0x17, 0x0, 0x0, 0x0, 0x1, 0xc0022263c0)
	pkg/sentry/kernel/task_syscall.go:283 +0xb5
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000eb6000, 0x1, 0x4, 0x20000080, 0x17, 0x0, 0x0, 0x0, 0xc000575d40, 0xd27595)
	pkg/sentry/kernel/task_syscall.go:244 +0x10a
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000eb6000, 0x2, 0xc0003641c0)
	pkg/sentry/kernel/task_syscall.go:219 +0x1b7
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc000eb6000, 0x12b8720, 0x0)
	pkg/sentry/kernel/task_run.go:215 +0x1853
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc000eb6000, 0x40cf)
	pkg/sentry/kernel/task_run.go:91 +0x2e6
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:279 +0x19e