panic: runtime error: slice bounds out of range [:17] with capacity 16

goroutine 309 [running]:
DIAGNOSIS:
I0102 17:23:26.881903    8125 x:0] ***************************
I0102 17:23:26.881978    8125 x:0] Args: [/syzkaller/managers/ptrace-proxy-sandbox-race/current/image -root /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=shared -network=sandbox -TESTONLY-unsafe-nonroot debug -stacks --ps ci-gvisor-ptrace-proxy-sandbox-race-3]
I0102 17:23:26.882116    8125 x:0] Version release-20191213.0-56-g1f384ac42b9e
I0102 17:23:26.882183    8125 x:0] PID: 8125
I0102 17:23:26.882247    8125 x:0] UID: 0, GID: 0
I0102 17:23:26.882293    8125 x:0] Configuration:
I0102 17:23:26.882346    8125 x:0] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0102 17:23:26.882377    8125 x:0] 		Platform: ptrace
I0102 17:23:26.882419    8125 x:0] 		FileAccess: shared, overlay: false
I0102 17:23:26.882471    8125 x:0] 		Network: sandbox, logging: false
I0102 17:23:26.882526    8125 x:0] 		Strace: false, max size: 1024, syscalls: []
I0102 17:23:26.882581    8125 x:0] ***************************
W0102 17:23:26.882614    8125 x:0] Block the TERM signal. This is only safe in tests!
D0102 17:23:26.882749    8125 x:0] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0102 17:23:26.891143    8125 x:0] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-3": signal 0
D0102 17:23:26.891276    8125 x:0] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0102 17:23:26.891343    8125 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0102 17:23:26.891706    8125 x:0] urpc: successfully marshalled 117 bytes.
I0102 17:23:26.965015    8125 x:0] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3", PID: 849
I0102 17:23:26.965169    8125 x:0] Retrieving sandbox stacks
D0102 17:23:26.965209    8125 x:0] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0102 17:23:26.965327    8125 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
W0102 17:23:26.965487    8125 x:0] FATAL ERROR: retrieving stacks: connecting to control server at PID 849: connection refused
retrieving stacks: connecting to control server at PID 849: connection refused
W0102 17:23:26.965743    8125 x:0] Failure to execute command, err: 1