panic: ptrace status unexpected: got 31, wanted stopped

goroutine 1601458 [running]:
DIAGNOSIS:
I0325 13:44:13.566894   32767 x:0] ***************************
I0325 13:44:13.567989   32767 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-1]
I0325 13:44:13.568083   32767 x:0] Git Revision: cea1dd7d21b976ad5cb145b94be7b1bf879235be
I0325 13:44:13.568102   32767 x:0] PID: 32767
I0325 13:44:13.568160   32767 x:0] UID: 0, GID: 0
I0325 13:44:13.568179   32767 x:0] Configuration:
I0325 13:44:13.568194   32767 x:0] 		RootDir: /syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root
I0325 13:44:13.568210   32767 x:0] 		Platform: ptrace
I0325 13:44:13.568246   32767 x:0] 		FileAccess: exclusive, overlay: true
I0325 13:44:13.568275   32767 x:0] 		Network: host, logging: false
I0325 13:44:13.568310   32767 x:0] 		Strace: false, max size: 1024, syscalls: []
I0325 13:44:13.568338   32767 x:0] ***************************
D0325 13:44:13.568710   32767 x:0] Load container "/syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root" "ci-gvisor-kvm-direct-overlay-host-race-1"
D0325 13:44:13.575733   32767 x:0] Signal container "ci-gvisor-kvm-direct-overlay-host-race-1": signal 0
D0325 13:44:13.575816   32767 x:0] Signal sandbox "ci-gvisor-kvm-direct-overlay-host-race-1"
D0325 13:44:13.575865   32767 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-overlay-host-race-1"
D0325 13:44:13.576696   32767 x:0] urpc: successfully marshalled 120 bytes.
I0325 13:44:13.895999   32767 x:0] Found sandbox "ci-gvisor-kvm-direct-overlay-host-race-1", PID: 13447
I0325 13:44:13.896067   32767 x:0] Retrieving sandbox stacks
D0325 13:44:13.896353   32767 x:0] Stacks sandbox "ci-gvisor-kvm-direct-overlay-host-race-1"
D0325 13:44:13.896591   32767 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-overlay-host-race-1"
D0325 13:44:13.896752   32767 x:0] urpc: successfully marshalled 36 bytes.
W0325 13:44:13.943600   32767 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-overlay-host-race-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-overlay-host-race-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer