panic: runtime error: index out of range

goroutine 791390 [running]:
unicode/utf8.EncodeRune(0xc0002e6948, 0x1, 0x8, 0xcc, 0x1)
	GOROOT/src/unicode/utf8/utf8.go:346 +0x148
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*inputQueueTransformer).transform(0x146a610, 0xc000137600, 0xc000137610, 0xc00021ec01, 0x386, 0x387, 0xc000000008)
	pkg/sentry/fs/tty/line_discipline.go:403 +0x3f5
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*queue).pushWaitBufLocked(0xc000137610, 0xc000137600, 0xc001210a80)
	pkg/sentry/fs/tty/queue.go:227 +0xa2
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*queue).write(0xc000137610, 0xdf9be0, 0xc001210a80, 0xdf8c20, 0xc000b37b00, 0x0, 0x1, 0x20000080, 0x387, 0x100, ...)
	pkg/sentry/fs/tty/queue.go:187 +0x1b2
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*lineDiscipline).inputQueueWrite(0xc000137600, 0xdf9be0, 0xc001210a80, 0xdf8c20, 0xc000b37b00, 0x0, 0x1, 0x20000080, 0x387, 0x100, ...)
	pkg/sentry/fs/tty/line_discipline.go:205 +0xef
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*masterFileOperations).Write(0xc000648040, 0xdf9be0, 0xc001210a80, 0xc000b9b3b0, 0xdf8c20, 0xc000b37b00, 0x0, 0x1, 0x20000080, 0x387, ...)
	pkg/sentry/fs/tty/master.go:141 +0x85
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).Writev(0xc000b9b3b0, 0xdf9be0, 0xc001210a80, 0xdf8c20, 0xc000b37b00, 0x0, 0x1, 0x20000080, 0x387, 0x100, ...)
	pkg/sentry/fs/file.go:314 +0x172
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.writev(0xc001210a80, 0xc000b9b3b0, 0xdf8c20, 0xc000b37b00, 0x0, 0x1, 0x20000080, 0x387, 0x100, 0x387, ...)
	pkg/sentry/syscalls/linux/sys_write.go:261 +0x90
DIAGNOSIS:
I0403 16:28:34.017249   13394 x:0] ***************************
I0403 16:28:34.017328   13394 x:0] Args: [/syzkaller/managers/ptrace-direct-overlay-host/current/image -root /syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root -watchdog-action=panic -network=none -debug -platform=ptrace -file-access=shared -network=host debug -stacks ci-gvisor-ptrace-direct-overlay-host-2]
I0403 16:28:34.017339   13394 x:0] Version release-20190304.1-78-gc4caccd54042
I0403 16:28:34.017343   13394 x:0] PID: 13394
I0403 16:28:34.017348   13394 x:0] UID: 0, GID: 0
I0403 16:28:34.017363   13394 x:0] Configuration:
I0403 16:28:34.017366   13394 x:0] 		RootDir: /syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root
I0403 16:28:34.017369   13394 x:0] 		Platform: ptrace
I0403 16:28:34.017375   13394 x:0] 		FileAccess: shared, overlay: false
I0403 16:28:34.017380   13394 x:0] 		Network: host, logging: false
I0403 16:28:34.017385   13394 x:0] 		Strace: false, max size: 1024, syscalls: []
I0403 16:28:34.017388   13394 x:0] ***************************
D0403 16:28:34.017405   13394 x:0] Load container "/syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root" "ci-gvisor-ptrace-direct-overlay-host-2"
D0403 16:28:34.018700   13394 x:0] Signal container "ci-gvisor-ptrace-direct-overlay-host-2": signal 0
D0403 16:28:34.018724   13394 x:0] Signal sandbox "ci-gvisor-ptrace-direct-overlay-host-2"
D0403 16:28:34.018728   13394 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-2"
D0403 16:28:34.018864   13394 x:0] urpc: successfully marshalled 118 bytes.
I0403 16:28:34.295392   13394 x:0] Found sandbox "ci-gvisor-ptrace-direct-overlay-host-2", PID: 61144
I0403 16:28:34.295406   13394 x:0] Retrieving sandbox stacks
D0403 16:28:34.295410   13394 x:0] Stacks sandbox "ci-gvisor-ptrace-direct-overlay-host-2"
D0403 16:28:34.295415   13394 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-2"
W0403 16:28:34.295457   13394 x:0] FATAL ERROR: retrieving stacks: connecting to control server at PID 61144: connection refused
retrieving stacks: connecting to control server at PID 61144: connection refused