panic: invalid allocation length: 0x0

goroutine 370 [running]:
DIAGNOSIS:
I0121 06:31:46.283935   31580 x:0] ***************************
I0121 06:31:46.284000   31580 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]
I0121 06:31:46.284114   31580 x:0] Version release-20200115.0-34-g10401599e104
I0121 06:31:46.284152   31580 x:0] PID: 31580
I0121 06:31:46.284178   31580 x:0] UID: 0, GID: 0
I0121 06:31:46.284203   31580 x:0] Configuration:
I0121 06:31:46.284226   31580 x:0] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0121 06:31:46.284247   31580 x:0] 		Platform: ptrace
I0121 06:31:46.284268   31580 x:0] 		FileAccess: shared, overlay: false
I0121 06:31:46.284302   31580 x:0] 		Network: sandbox, logging: false
I0121 06:31:46.284338   31580 x:0] 		Strace: false, max size: 1024, syscalls: []
I0121 06:31:46.284366   31580 x:0] ***************************
W0121 06:31:46.284390   31580 x:0] Block the TERM signal. This is only safe in tests!
D0121 06:31:46.284602   31580 x:0] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0121 06:31:46.291452   31580 x:0] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0
D0121 06:31:46.291574   31580 x:0] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0121 06:31:46.291794   31580 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0121 06:31:46.292396   31580 x:0] urpc: successfully marshalled 117 bytes.
I0121 06:31:46.404184   31580 x:0] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 28485
I0121 06:31:46.404278   31580 x:0] Retrieving sandbox stacks
D0121 06:31:46.404304   31580 x:0] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0121 06:31:46.404351   31580 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
W0121 06:31:46.404453   31580 x:0] FATAL ERROR: retrieving stacks: connecting to control server at PID 28485: connection refused
retrieving stacks: connecting to control server at PID 28485: connection refused
W0121 06:31:46.404632   31580 x:0] Failure to execute command, err: 1