panic: runtime error: index out of range

goroutine 88377 [running]:
unicode/utf8.EncodeRune(0xc0002dc408, 0x1, 0x8, 0xc0000000c9, 0x1)
	GOROOT/src/unicode/utf8/utf8.go:346 +0x29f
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*inputQueueTransformer).transform(0x23e9c70, 0xc0001549a0, 0xc0001549b0, 0xc00041e469, 0x5d, 0x5d, 0xc0003c44c0)
	pkg/sentry/fs/tty/line_discipline.go:403 +0x4a3
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*queue).pushWaitBufLocked(0xc0001549b0, 0xc0001549a0, 0xc000f35500)
DIAGNOSIS:
I0403 16:48:59.535205   11048 x:0] ***************************
I0403 16:48:59.535412   11048 x:0] Args: [/syzkaller/managers/kvm-direct-overlay-host-race/current/image -root /syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -platform=ptrace -file-access=exclusive -overlay -network=host debug -stacks ci-gvisor-kvm-direct-overlay-host-race-2]
I0403 16:48:59.535479   11048 x:0] Version release-20190304.1-78-gc4caccd54042
I0403 16:48:59.535498   11048 x:0] PID: 11048
I0403 16:48:59.535527   11048 x:0] UID: 0, GID: 0
I0403 16:48:59.535544   11048 x:0] Configuration:
I0403 16:48:59.535567   11048 x:0] 		RootDir: /syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root
I0403 16:48:59.535600   11048 x:0] 		Platform: ptrace
I0403 16:48:59.535638   11048 x:0] 		FileAccess: exclusive, overlay: true
I0403 16:48:59.535660   11048 x:0] 		Network: host, logging: false
I0403 16:48:59.535681   11048 x:0] 		Strace: false, max size: 1024, syscalls: []
I0403 16:48:59.535711   11048 x:0] ***************************
D0403 16:48:59.535756   11048 x:0] Load container "/syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root" "ci-gvisor-kvm-direct-overlay-host-race-2"
D0403 16:48:59.541597   11048 x:0] Signal container "ci-gvisor-kvm-direct-overlay-host-race-2": signal 0
D0403 16:48:59.541654   11048 x:0] Signal sandbox "ci-gvisor-kvm-direct-overlay-host-race-2"
D0403 16:48:59.541694   11048 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-overlay-host-race-2"
D0403 16:48:59.542018   11048 x:0] urpc: successfully marshalled 120 bytes.
I0403 16:48:59.803770   11048 x:0] Found sandbox "ci-gvisor-kvm-direct-overlay-host-race-2", PID: 5839
I0403 16:48:59.803814   11048 x:0] Retrieving sandbox stacks
D0403 16:48:59.803840   11048 x:0] Stacks sandbox "ci-gvisor-kvm-direct-overlay-host-race-2"
D0403 16:48:59.803880   11048 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-overlay-host-race-2"
D0403 16:48:59.803984   11048 x:0] urpc: successfully marshalled 36 bytes.
W0403 16:48:59.843669   11048 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-overlay-host-race-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-overlay-host-race-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer