CimFS snapshotter causes BSOD on Windows Server 2022 (build 20348.4773) under concurrent container workload

**Describe the bug** Using the CimFS snapshotter (`cimfs.sys`) with containerd 2.2.1 on Windows Server 2022 causes repeated BSODs when pulling and starting multiple container images concurrently. Two distinct bugchecks occurred within 13 minutes: 1. `0x00000044` (`MULTIPLE_IRP_COMPLETE_REQUESTS`) 2. `0x000001ca` (`SYNTHETIC_WATCHDOG_TIMEOUT`) Also filed as https://github.com/microsoft/hcsshim/issues/2625 since the CimFS snapshotter/differ implementation lives in hcsshim. **To Reproduce** 1. Install containerd v2.2.1 on Windows Server 2022 (build 20348.4773). 2. Configure containerd to use the `cimfs` snapshotter: ```toml version = 3 [plugins.'io.containerd.cri.v1.images'] snapshotter = 'cimfs' [plugins.'io.containerd.transfer.v1.local'] [[plugins.'io.containerd.transfer.v1.local'.unpack_config]] platform = 'windows/amd64' snapshotter = 'cimfs' differ = 'cimfs' ``` 3. Start containerd and kubelet. 4. Pull ~15-20 Windows container images concurrently (Kubernetes daemonsets + workloads). 5. System BSODs within minutes. **Expected behavior** The CimFS kernel driver should handle concurrent image layer mounts without crashing. **Configuration:** - Edition: Windows Server 2022 Datacenter (21H2) - OS Build: 20348.4773 (KB5075906, February 2026 cumulative update) - `cimfs.sys` driver version: 10.0.20348.3804 - Container engine: containerd v2.2.1 - Orchestrator: Kubernetes v1.34.2 - Hardware: Bare metal, AMD Ryzen 9 7950X, 64GB RAM - Base images: `mcr.microsoft.com/windows/servercore:ltsc2022` and `mcr.microsoft.com/windows/nanoserver:ltsc2022` **Additional context** Bugcheck details: ``` Bugcheck 1 (12:37 PST): Code: 0x00000044 (MULTIPLE_IRP_COMPLETE_REQUESTS) Parameters: (0xffffb1075846f4c0, 0x000000000000125a, 0x0000000000000000, 0x0000000000000000) Bugcheck 2 (12:50 PST): Code: 0x000001ca (SYNTHETIC_WATCHDOG_TIMEOUT) Parameters: (0x0000000019628f83, 0x00000001bf799269, 0x00000001bf7ca01d, 0x0000000000000008) ``` The system was stable for over 3 years with the default `windows` (WCIFS) snapshotter. BSODs started immediately after switching to CimFS and stopped after reverting. The crashes appear to be in the `cimfs.sys` kernel driver under concurrent I/O load. Minidumps are available if needed.