panic: runtime error: index out of range

goroutine 2332047 [running]:
unicode/utf8.EncodeRune(0xc000c6bf09, 0x1, 0x7, 0xc000000083, 0x1)
	GOROOT/src/unicode/utf8/utf8.go:346 +0x29f
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*inputQueueTransformer).transform(0x23e9c70, 0xc0019122c0, 0xc0019122d0, 0xc000c6bf02, 0x4, 0x4, 0xc0007fac80)
	pkg/sentry/fs/tty/line_discipline.go:403 +0x4a3
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*queue).pushWaitBufLocked(0xc0019122d0, 0xc0019122c0, 0xc001e66a80)
	pkg/sentry/fs/tty/queue.go:227 +0x193
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*queue).write(0xc0019122d0, 0x12d1200, 0xc001e66a80, 0x12d0300, 0xc0011d7600, 0x0, 0x1, 0x20000080, 0x6, 0x100, ...)
	pkg/sentry/fs/tty/queue.go:187 +0x1d3
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*lineDiscipline).inputQueueWrite(0xc0019122c0, 0x12d1200, 0xc001e66a80, 0x12d0300, 0xc0011d7600, 0x0, 0x1, 0x20000080, 0x6, 0x100, ...)
	pkg/sentry/fs/tty/line_discipline.go:205 +0x148
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*masterFileOperations).Write(0xc0001297b0, 0x12d1200, 0xc001e66a80, 0xc0017ad680, 0x12d0300, 0xc0011d7600, 0x0, 0x1, 0x20000080, 0x6, ...)
	pkg/sentry/fs/tty/master.go:141 +0x11d
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).Writev(0xc0017ad680, 0x12d1200, 0xc001e66a80, 0x12d0300, 0xc0011d7600, 0x0, 0x1, 0x20000080, 0x6, 0x100, ...)
	pkg/sentry/fs/file.go:314 +0x1fd
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.writev(0xc001e66a80, 0xc0017ad680, 0x12d0300, 0xc0011d7600, 0x0, 0x1, 0x20000080, 0x6, 0x100, 0x6, ...)
	pkg/sentry/syscalls/linux/sys_write.go:261 +0xe1
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Write(0xc001e66a80, 0x4, 0x20000080, 0x6, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_write.go:71 +0x294
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc001e66a80, 0x1, 0x4, 0x20000080, 0x6, 0x0, 0x0, 0x0, 0x465c01, 0xc001e67258, ...)
	pkg/sentry/kernel/task_syscall.go:165 +0x408
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc001e66a80, 0x1, 0x4, 0x20000080, 0x6, 0x0, 0x0, 0x0, 0x1, 0xc0023dfe00)
	pkg/sentry/kernel/task_syscall.go:283 +0xb5
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc001e66a80, 0x1, 0x4, 0x20000080, 0x6, 0x0, 0x0, 0x0, 0xc001553d40, 0xd27595)
	pkg/sentry/kernel/task_syscall.go:244 +0x10a
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc001e66a80, 0x2, 0xc0007d8580)
	pkg/sentry/kernel/task_syscall.go:219 +0x1b7
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc001e66a80, 0x12b8720, 0x0)
	pkg/sentry/kernel/task_run.go:215 +0x1853
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc001e66a80, 0x3779)
	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
DIAGNOSIS:
I0403 17:51:38.285607   52187 x:0] ***************************
I0403 17:51:38.285712   52187 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-3]
I0403 17:51:38.285769   52187 x:0] Version release-20190304.1-78-gc4caccd54042
I0403 17:51:38.285798   52187 x:0] PID: 52187
I0403 17:51:38.285815   52187 x:0] UID: 0, GID: 0
I0403 17:51:38.285829   52187 x:0] Configuration:
I0403 17:51:38.285853   52187 x:0] 		RootDir: /syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root
I0403 17:51:38.285872   52187 x:0] 		Platform: ptrace
I0403 17:51:38.285895   52187 x:0] 		FileAccess: exclusive, overlay: true
I0403 17:51:38.285941   52187 x:0] 		Network: host, logging: false
I0403 17:51:38.285961   52187 x:0] 		Strace: false, max size: 1024, syscalls: []
I0403 17:51:38.285982   52187 x:0] ***************************
D0403 17:51:38.286029   52187 x:0] Load container "/syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root" "ci-gvisor-kvm-direct-overlay-host-race-3"
D0403 17:51:38.304360   52187 x:0] Signal container "ci-gvisor-kvm-direct-overlay-host-race-3": signal 0
D0403 17:51:38.304435   52187 x:0] Signal sandbox "ci-gvisor-kvm-direct-overlay-host-race-3"
D0403 17:51:38.304466   52187 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-overlay-host-race-3"
D0403 17:51:38.305189   52187 x:0] urpc: successfully marshalled 120 bytes.
I0403 17:51:38.842890   52187 x:0] Found sandbox "ci-gvisor-kvm-direct-overlay-host-race-3", PID: 56669
I0403 17:51:38.842974   52187 x:0] Retrieving sandbox stacks
D0403 17:51:38.843019   52187 x:0] Stacks sandbox "ci-gvisor-kvm-direct-overlay-host-race-3"
D0403 17:51:38.843082   52187 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-overlay-host-race-3"
D0403 17:51:38.843265   52187 x:0] urpc: successfully marshalled 36 bytes.
W0403 17:51:38.900589   52187 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-overlay-host-race-3" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-overlay-host-race-3" stacks: urpc method "debug.Stacks" failed: connection reset by peer