panic: runtime error: index out of range

goroutine 153424 [running]:
unicode/utf8.EncodeRune(0xc0023f6554, 0x1, 0x4, 0xb2, 0xb2)
	GOROOT/src/unicode/utf8/utf8.go:346 +0x148
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*inputQueueTransformer).transform(0x1460610, 0xc000df8420, 0xc000df8430, 0xc000878006, 0x42, 0x46, 0x8)
	pkg/sentry/fs/tty/line_discipline.go:403 +0x3f5
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*queue).pushWaitBufLocked(0xc000df8430, 0xc000df8420, 0xc000df8430)
	pkg/sentry/fs/tty/queue.go:227 +0xa2
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*queue).pushWaitBuf(0xc000df8430, 0xc000df8420, 0x0)
	pkg/sentry/fs/tty/queue.go:212 +0x78
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*lineDiscipline).setTermios(0xc000df8420, 0xdf4000, 0xc002252000, 0xdf3040, 0xc002500d80, 0x4, 0x5402, 0x20000180, 0x0, 0x0, ...)
	pkg/sentry/fs/tty/line_discipline.go:143 +0x215
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*masterFileOperations).Ioctl(0xc0006a2320, 0xdf4000, 0xc002252000, 0xdf3040, 0xc002500d80, 0x4, 0x5402, 0x20000180, 0x0, 0x0, ...)
DIAGNOSIS:
I0404 02:08:30.735620   38414 x:0] ***************************
I0404 02:08:30.735678   38414 x:0] Args: [/syzkaller/managers/kvm-direct-sandbox/current/image -root /syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root -watchdog-action=panic -network=none -debug -platform=kvm -file-access=exclusive -network=sandbox debug -stacks ci-gvisor-kvm-direct-sandbox-1]
I0404 02:08:30.735704   38414 x:0] Version release-20190304.1-70-g1df3fa699774
I0404 02:08:30.735709   38414 x:0] PID: 38414
I0404 02:08:30.735715   38414 x:0] UID: 0, GID: 0
I0404 02:08:30.735718   38414 x:0] Configuration:
I0404 02:08:30.735721   38414 x:0] 		RootDir: /syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root
I0404 02:08:30.735724   38414 x:0] 		Platform: kvm
I0404 02:08:30.735746   38414 x:0] 		FileAccess: exclusive, overlay: false
I0404 02:08:30.735754   38414 x:0] 		Network: sandbox, logging: false
I0404 02:08:30.735763   38414 x:0] 		Strace: false, max size: 1024, syscalls: []
I0404 02:08:30.735771   38414 x:0] ***************************
D0404 02:08:30.735794   38414 x:0] Load container "/syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root" "ci-gvisor-kvm-direct-sandbox-1"
D0404 02:08:30.737151   38414 x:0] Signal container "ci-gvisor-kvm-direct-sandbox-1": signal 0
D0404 02:08:30.737171   38414 x:0] Signal sandbox "ci-gvisor-kvm-direct-sandbox-1"
D0404 02:08:30.737176   38414 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-sandbox-1"
D0404 02:08:30.737422   38414 x:0] urpc: successfully marshalled 110 bytes.
I0404 02:08:31.077994   38414 x:0] Found sandbox "ci-gvisor-kvm-direct-sandbox-1", PID: 61422
I0404 02:08:31.078016   38414 x:0] Retrieving sandbox stacks
D0404 02:08:31.078021   38414 x:0] Stacks sandbox "ci-gvisor-kvm-direct-sandbox-1"
D0404 02:08:31.078026   38414 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-sandbox-1"
D0404 02:08:31.078077   38414 x:0] urpc: successfully marshalled 36 bytes.
W0404 02:08:31.151731   38414 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-sandbox-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-sandbox-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer