panic: runtime error: index out of range

goroutine 1998078 [running]:
unicode/utf8.EncodeRune(0xc000297b69, 0x1, 0x7, 0xef, 0xc0000000ef)
	GOROOT/src/unicode/utf8/utf8.go:346 +0x148
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*inputQueueTransformer).transform(0x146a610, 0xc00031a9a0, 0xc00031a9b0, 0xc0003a80f2, 0x46, 0x48, 0xc000000008)
	pkg/sentry/fs/tty/line_discipline.go:403 +0x3f5
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*queue).pushWaitBufLocked(0xc00031a9b0, 0xc00031a9a0, 0xc0014d3500)
	pkg/sentry/fs/tty/queue.go:227 +0xa2
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*queue).write(0xc00031a9b0, 0xdf9be0, 0xc0014d3500, 0xdf8c20, 0xc0013b2000, 0x0, 0x1, 0x20000080, 0x48, 0x100, ...)
	pkg/sentry/fs/tty/queue.go:187 +0x1b2
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*lineDiscipline).inputQueueWrite(0xc00031a9a0, 0xdf9be0, 0xc0014d3500, 0xdf8c20, 0xc0013b2000, 0x0, 0x1, 0x20000080, 0x48, 0x100, ...)
	pkg/sentry/fs/tty/line_discipline.go:205 +0xef
gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*masterFileOperations).Write(0xc0006861f0, 0xdf9be0, 0xc0014d3500, 0xc000b33170, 0xdf8c20, 0xc0013b2000, 0x0, 0x1, 0x20000080, 0x48, ...)
	pkg/sentry/fs/tty/master.go:141 +0x85
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).Writev(0xc000b33170, 0xdf9be0, 0xc0014d3500, 0xdf8c20, 0xc0013b2000, 0x0, 0x1, 0x20000080, 0x48, 0x100, ...)
	pkg/sentry/fs/file.go:314 +0x172
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.writev(0xc0014d3500, 0xc000b33170, 0xdf8c20, 0xc0013b2000, 0x0, 0x1, 0x20000080, 0x48, 0x100, 0x48, ...)
	pkg/sentry/syscalls/linux/sys_write.go:261 +0x90
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Write(0xc0014d3500, 0x3, 0x20000080, 0x48, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_write.go:71 +0x1d1
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0014d3500, 0x1, 0x3, 0x20000080, 0x48, 0x0, 0x0, 0x0, 0xc001198d08, 0xc001198dc0, ...)
	pkg/sentry/kernel/task_syscall.go:165 +0x10a
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0014d3500, 0x1, 0x3, 0x20000080, 0x48, 0x0, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:283 +0x69
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0014d3500, 0x1, 0x3, 0x20000080, 0x48, 0x0, 0x0, 0x0, 0xc001f103c0, 0xe09640)
	pkg/sentry/kernel/task_syscall.go:244 +0x96
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0014d3500, 0x2, 0xc00072c2c0)
	pkg/sentry/kernel/task_syscall.go:219 +0x13d
DIAGNOSIS:
I0403 17:22:11.520461   43998 x:0] ***************************
I0403 17:22:11.520513   43998 x:0] Args: [/syzkaller/managers/main/current/image -root /syzkaller/managers/main/workdir/gvisor_root -watchdog-action=panic -network=none -debug -platform=ptrace -file-access=shared -network=none debug -stacks ci-gvisor-main-1]
I0403 17:22:11.520527   43998 x:0] Version release-20190304.1-78-gc4caccd54042
I0403 17:22:11.520531   43998 x:0] PID: 43998
I0403 17:22:11.520536   43998 x:0] UID: 0, GID: 0
I0403 17:22:11.520539   43998 x:0] Configuration:
I0403 17:22:11.520541   43998 x:0] 		RootDir: /syzkaller/managers/main/workdir/gvisor_root
I0403 17:22:11.520544   43998 x:0] 		Platform: ptrace
I0403 17:22:11.520549   43998 x:0] 		FileAccess: shared, overlay: false
I0403 17:22:11.520555   43998 x:0] 		Network: none, logging: false
I0403 17:22:11.520564   43998 x:0] 		Strace: false, max size: 1024, syscalls: []
I0403 17:22:11.520568   43998 x:0] ***************************
D0403 17:22:11.520581   43998 x:0] Load container "/syzkaller/managers/main/workdir/gvisor_root" "ci-gvisor-main-1"
D0403 17:22:11.522727   43998 x:0] Signal container "ci-gvisor-main-1": signal 0
D0403 17:22:11.522792   43998 x:0] Signal sandbox "ci-gvisor-main-1"
D0403 17:22:11.522822   43998 x:0] Connecting to sandbox "ci-gvisor-main-1"
D0403 17:22:11.523069   43998 x:0] urpc: successfully marshalled 96 bytes.
I0403 17:22:11.843259   43998 x:0] Found sandbox "ci-gvisor-main-1", PID: 9251
I0403 17:22:11.843280   43998 x:0] Retrieving sandbox stacks
D0403 17:22:11.843283   43998 x:0] Stacks sandbox "ci-gvisor-main-1"
D0403 17:22:11.843287   43998 x:0] Connecting to sandbox "ci-gvisor-main-1"
D0403 17:22:11.843337   43998 x:0] urpc: successfully marshalled 36 bytes.
W0403 17:22:11.911584   43998 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-main-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-main-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer