CI: Flock test failed.

[zhoucheng361]

What happened:
https://github.com/juicedata/juicefs/actions/runs/13404626272/job/37442216353

go test ./pkg/meta/... -rapid.meta=sqlite3://test.db -rapid.seed=21172 -rapid.checks=100000 -rapid.steps=200 -run "TestFSOps" -v -failfast -count=1 -timeout=30m -cover -coverpkg=./pkg/...,./cmd/... -args -test.gocoverdir="/home/runner/work/juicefs/juicefs/cover"
warning: no packages being tested depend on matches for pattern ./cmd/...
	github.com/juicedata/juicefs/pkg/meta/pb		coverage: 0.0% of statements
=== RUN   TestFSOps
    random_test.go:2159: [rapid] failed after 0 tests: expect [] but got []
        To reproduce, specify -run="TestFSOps" -rapid.failfile="testdata/rapid/TestFSOps/TestFSOps-2025021903[11](https://github.com/juicedata/juicefs/actions/runs/13404626272/job/37442217461#step:6:12)06-2750.fail" (or -rapid.seed=21172)
        Failed test output:
    random_test.go:[12](https://github.com/juicedata/juicefs/actions/runs/13404626272/job/37442217461#step:6:13)6: [rapid] draw sid: 0x0
    random_test.go:2159: [rapid] draw action: "Flock"
    random_test.go:163: [rapid] draw uid: 0x0
    random_test.go:164: [rapid] draw gid: 0x0
    random_test.go:176: [rapid] draw node: 0x1
    random_test.go:1928: [rapid] draw owner: 0x0
    random_test.go:1929: [rapid] draw typ: 0x0
    random_test.go:1971: expect [] but got []
--- FAIL: TestFSOps (3.81s)

go test ./pkg/meta/... -rapid.meta=redis://127.0.0.1:6379/1 -rapid.seed=7908 -rapid.checks=100000 -rapid.steps=200 -run "TestFSOps" -v -failfast -count=1 -timeout=30m -cover -coverpkg=./pkg/...,./cmd/... -args -test.gocoverdir="/home/runner/work/juicefs/juicefs/cover"
warning: no packages being tested depend on matches for pattern ./cmd/...
	github.com/juicedata/juicefs/pkg/meta/pb		coverage: 0.0% of statements
=== RUN   TestFSOps
    random_test.go:2159: [rapid] failed after 0 tests: expect [] but got []
        To reproduce, specify -run="TestFSOps" -rapid.failfile="testdata/rapid/TestFSOps/TestFSOps-2025021903[11](https://github.com/juicedata/juicefs/actions/runs/13404626272/job/37442216353#step:6:12)10-3927.fail" (or -rapid.seed=7908)
        Failed test output:
    random_test.go:[12](https://github.com/juicedata/juicefs/actions/runs/13404626272/job/37442216353#step:6:13)6: [rapid] draw sid: 0x0
    random_test.go:2159: [rapid] draw action: "Flock"
    random_test.go:163: [rapid] draw uid: 0x0
    random_test.go:164: [rapid] draw gid: 0x0
    random_test.go:176: [rapid] draw node: 0x1
    random_test.go:1928: [rapid] draw owner: 0x0
    random_test.go:1929: [rapid] draw typ: 0x0
    random_test.go:1971: expect [] but got []
--- FAIL: TestFSOps (1.05s)
FAIL
coverage: 4.3% of statements in ./pkg/..., ./cmd/...
FAIL	github.com/juicedata/juicefs/pkg/meta	1.410s

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?

Environment:

• JuiceFS version (use juicefs --version) or Hadoop Java SDK version:
• Cloud provider or hardware configuration running JuiceFS:
• OS (e.g cat /etc/os-release):
• Kernel (e.g. uname -a):
• Object storage (cloud provider and region, or self maintained):
• Metadata engine info (version, cloud provider managed or self maintained):
• Network connectivity (JuiceFS to metadata engine, JuiceFS to object storage):
• Others: