panic: invalid allocation length: 0x0

goroutine 2362673 [running]:
DIAGNOSIS:
I0128 06:31:04.836107   49336 x:0] ***************************
I0128 06:31:04.836195   49336 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]
I0128 06:31:04.836385   49336 x:0] Version release-20200115.0-104-g6b14be4246e8
I0128 06:31:04.836458   49336 x:0] PID: 49336
I0128 06:31:04.836520   49336 x:0] UID: 0, GID: 0
I0128 06:31:04.836572   49336 x:0] Configuration:
I0128 06:31:04.836600   49336 x:0] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0128 06:31:04.836638   49336 x:0] 		Platform: ptrace
I0128 06:31:04.836681   49336 x:0] 		FileAccess: shared, overlay: false
I0128 06:31:04.836733   49336 x:0] 		Network: sandbox, logging: false
I0128 06:31:04.836819   49336 x:0] 		Strace: false, max size: 1024, syscalls: []
I0128 06:31:04.836875   49336 x:0] ***************************
W0128 06:31:04.836913   49336 x:0] Block the TERM signal. This is only safe in tests!
D0128 06:31:04.837075   49336 x:0] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0128 06:31:04.859487   49336 x:0] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-3": signal 0
D0128 06:31:04.859671   49336 x:0] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0128 06:31:04.859749   49336 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0128 06:31:04.860373   49336 x:0] urpc: successfully marshalled 117 bytes.
I0128 06:31:05.793175   49336 x:0] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3", PID: 34287
I0128 06:31:05.794507   49336 x:0] Retrieving sandbox stacks
D0128 06:31:05.795149   49336 x:0] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0128 06:31:05.795242   49336 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0128 06:31:05.795385   49336 x:0] urpc: successfully marshalled 36 bytes.
W0128 06:31:05.889628   49336 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3" stacks: urpc method "debug.Stacks" failed: connection reset by peer
W0128 06:31:05.889983   49336 x:0] Failure to execute command, err: 1