fatal error: unknown caller pc
DIAGNOSIS:
I1008 21:48:11.724224   23510 x:0] ***************************
I1008 21:48:11.724296   23510 x:0] Args: [/syzkaller/managers/kvm-proxy-overlay-sandbox/current/image -root /syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=kvm -file-access=exclusive -overlay -network=sandbox debug -stacks ci-gvisor-kvm-proxy-overlay-sandbox-2]
I1008 21:48:11.724314   23510 x:0] Version release-20190806.1-247-g7c1587e3401a
I1008 21:48:11.724318   23510 x:0] PID: 23510
I1008 21:48:11.724325   23510 x:0] UID: 0, GID: 0
I1008 21:48:11.724328   23510 x:0] Configuration:
I1008 21:48:11.724332   23510 x:0] 		RootDir: /syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root
I1008 21:48:11.724336   23510 x:0] 		Platform: kvm
I1008 21:48:11.724344   23510 x:0] 		FileAccess: exclusive, overlay: true
I1008 21:48:11.724356   23510 x:0] 		Network: sandbox, logging: false
I1008 21:48:11.724363   23510 x:0] 		Strace: false, max size: 1024, syscalls: []
I1008 21:48:11.724370   23510 x:0] ***************************
D1008 21:48:11.724410   23510 x:0] Load container "/syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root" "ci-gvisor-kvm-proxy-overlay-sandbox-2"
D1008 21:48:11.726363   23510 x:0] Signal container "ci-gvisor-kvm-proxy-overlay-sandbox-2": signal 0
D1008 21:48:11.726399   23510 x:0] Signal sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-2"
D1008 21:48:11.726405   23510 x:0] Connecting to sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-2"
D1008 21:48:11.726610   23510 x:0] urpc: successfully marshalled 117 bytes.
I1008 21:48:12.783225   23510 x:0] Found sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-2", PID: 2935
I1008 21:48:12.783250   23510 x:0] Retrieving sandbox stacks
D1008 21:48:12.783255   23510 x:0] Stacks sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-2"
D1008 21:48:12.783261   23510 x:0] Connecting to sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-2"
D1008 21:48:12.783322   23510 x:0] urpc: successfully marshalled 36 bytes.
W1008 21:48:13.021187   23510 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer
W1008 21:48:13.021322   23510 x:0] Failure to execute command, err: 1