panic: invalid allocation length: 0x0

DIAGNOSIS:
I0121 06:06:00.604853   15510 x:0] ***************************
I0121 06:06:00.604916   15510 x:0] Args: [/syzkaller/managers/ptrace-direct-overlay-host-race/current/image -root /syzkaller/managers/ptrace-direct-overlay-host-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=exclusive -overlay -network=host -TESTONLY-unsafe-nonroot debug -stacks --ps ci-gvisor-ptrace-direct-overlay-host-race-3]
I0121 06:06:00.605051   15510 x:0] Version release-20200115.0-34-g10401599e104
I0121 06:06:00.605110   15510 x:0] PID: 15510
I0121 06:06:00.605166   15510 x:0] UID: 0, GID: 0
I0121 06:06:00.605209   15510 x:0] Configuration:
I0121 06:06:00.605244   15510 x:0] 		RootDir: /syzkaller/managers/ptrace-direct-overlay-host-race/workdir/gvisor_root
I0121 06:06:00.605289   15510 x:0] 		Platform: ptrace
I0121 06:06:00.605319   15510 x:0] 		FileAccess: exclusive, overlay: true
I0121 06:06:00.605577   15510 x:0] 		Network: host, logging: false
I0121 06:06:00.605688   15510 x:0] 		Strace: false, max size: 1024, syscalls: []
I0121 06:06:00.605743   15510 x:0] ***************************
W0121 06:06:00.605813   15510 x:0] Block the TERM signal. This is only safe in tests!
D0121 06:06:00.605961   15510 x:0] Load container "/syzkaller/managers/ptrace-direct-overlay-host-race/workdir/gvisor_root" "ci-gvisor-ptrace-direct-overlay-host-race-3"
D0121 06:06:00.617766   15510 x:0] Signal container "ci-gvisor-ptrace-direct-overlay-host-race-3": signal 0
D0121 06:06:00.617907   15510 x:0] Signal sandbox "ci-gvisor-ptrace-direct-overlay-host-race-3"
D0121 06:06:00.617977   15510 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-race-3"
D0121 06:06:00.621860   15510 x:0] urpc: successfully marshalled 123 bytes.
I0121 06:06:00.986825   15510 x:0] Found sandbox "ci-gvisor-ptrace-direct-overlay-host-race-3", PID: 2482
I0121 06:06:00.986920   15510 x:0] Retrieving sandbox stacks
D0121 06:06:00.986966   15510 x:0] Stacks sandbox "ci-gvisor-ptrace-direct-overlay-host-race-3"
D0121 06:06:00.987047   15510 x:0] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-race-3"
D0121 06:06:00.987233   15510 x:0] urpc: successfully marshalled 36 bytes.
W0121 06:06:01.044581   15510 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-ptrace-direct-overlay-host-race-3" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-ptrace-direct-overlay-host-race-3" stacks: urpc method "debug.Stacks" failed: connection reset by peer
W0121 06:06:01.044877   15510 x:0] Failure to execute command, err: 1