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

DIAGNOSIS:
I0102 17:33:27.121959   36075 x:0] ***************************
I0102 17:33:27.122027   36075 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-1]
I0102 17:33:27.122153   36075 x:0] Version release-20191213.0-56-g1f384ac42b9e
I0102 17:33:27.122188   36075 x:0] PID: 36075
I0102 17:33:27.122230   36075 x:0] UID: 0, GID: 0
I0102 17:33:27.122264   36075 x:0] Configuration:
I0102 17:33:27.122293   36075 x:0] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0102 17:33:27.122319   36075 x:0] 		Platform: ptrace
I0102 17:33:27.122371   36075 x:0] 		FileAccess: shared, overlay: false
I0102 17:33:27.122437   36075 x:0] 		Network: sandbox, logging: false
I0102 17:33:27.122498   36075 x:0] 		Strace: false, max size: 1024, syscalls: []
I0102 17:33:27.122547   36075 x:0] ***************************
W0102 17:33:27.122578   36075 x:0] Block the TERM signal. This is only safe in tests!
D0102 17:33:27.122685   36075 x:0] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0102 17:33:27.129896   36075 x:0] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0
D0102 17:33:27.130010   36075 x:0] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0102 17:33:27.130059   36075 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0102 17:33:27.130466   36075 x:0] urpc: successfully marshalled 117 bytes.
I0102 17:33:27.204732   36075 x:0] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 30607
I0102 17:33:27.204823   36075 x:0] Retrieving sandbox stacks
D0102 17:33:27.204855   36075 x:0] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0102 17:33:27.204915   36075 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
W0102 17:33:27.205026   36075 x:0] FATAL ERROR: retrieving stacks: connecting to control server at PID 30607: connection refused
retrieving stacks: connecting to control server at PID 30607: connection refused
W0102 17:33:27.205259   36075 x:0] Failure to execute command, err: 1