STATUS_ALPC_CHECK_COMPLETION_LIST (0X40000030) fix

Quick answer

STATUS_ALPC_CHECK_COMPLETION_LIST (0X40000030) means the ALPC receive completed successfully — it's a success code, not an error. If you're seeing this in a BSOD or event log, your kernel memory was corrupted elsewhere, and this code just happened to be the last thing the CPU checked before crashing. Run Driver Verifier and a memory test.

Context — why you're seeing this code

What's actually happening here is that Windows' Advanced Local Procedure Call (ALPC) subsystem — used for fast inter-process communication between system services — finished receiving data. The 0x40000030 value is the NTSTATUS code that says "receive complete." It's not an error. But when this shows up in a crash dump as the primary bug check, it means the system had a corrupted lookaside list or completion list pointer. The ALPC code tried to read a memory address that didn't exist anymore, or pointed to freed memory.

The real trigger is almost always a buggy kernel-mode driver that wrote to the wrong memory address, or faulty RAM that flipped a bit in kernel memory. I've seen this on Windows 10 20H2 through Windows 11 23H2, often after installing a VPN client, a printer driver, or an old anti-virus that hooks into the kernel. The ALPC check itself isn't the problem — it's the canary in the coal mine.

Numbered fix steps

1. Boot into Safe Mode with Networking. This stops most third-party drivers from loading. If the error stops, you've confirmed a driver is the cause. Press F8 or Shift + Restart from the login screen.
2. Run Driver Verifier. Open Command Prompt as Admin, type verifier, hit Enter. Choose "Create custom settings" → "Select individual settings" → check all boxes except "Low resources simulation." Then choose "Select driver names from a list" and sort by Provider. Uncheck all Microsoft drivers. Check every third-party driver. Reboot. Let it run for 48 hours or until it crashes again — it will point you to the exact driver file.
3. Check the crash dump manually. Download WinDbg (from Microsoft Store). Open the .dmp file from C:\Windows\Minidump. Run !analyze -v. Look at the STACK_TEXT section — see which driver's functions appear right before ntoskrnl.exe. That's your culprit. Common ones: aswSnx.sys (Avast), e1d64x64.sys (Intel Ethernet), rt640x64.sys (Realtek LAN).
4. Test your RAM. Bad memory can corrupt kernel data structures. Open Windows Memory Diagnostic (search for it in Start), choose "Restart now and check for problems." Let it run the extended test — takes a few hours. If it finds errors, replace the faulty stick.
5. Update or roll back drivers. If Verifier flagged a specific driver, go to Device Manager, find that device, right-click → Properties → Driver tab. Try "Roll Back Driver" if the issue started after an update. Otherwise, download the latest driver from the manufacturer's site — not Windows Update. For network adapters, try the driver from Intel or Realtek directly.

Alternative fixes if the main one fails

• System File Checker + DISM. Run sfc /scannow in Admin CMD. Then DISM /Online /Cleanup-Image /RestoreHealth. This repairs corrupted system files that could be causing the ALPC completion list corruption.
• Disable Fast Startup. In Power Options → "Choose what the power button does" → uncheck "Turn on fast startup." Fast startup keeps kernel memory across reboots, which can mask memory corruption.
• Check for pending Windows updates. If this started after a recent cumulative update, uninstall it: Settings → Windows Update → Update history → Uninstall updates. Look for the most recent KB. If removing it fixes the problem, report it to Microsoft via Feedback Hub.
• Clean boot. Run msconfig, select "Selective startup," uncheck "Load startup items." Also check "Services" tab → "Hide all Microsoft services" → Disable all. Reboot. If the error vanishes, re-enable services one batch at a time until it returns. That's your conflict.

Prevention tip

The reason step 3 works — analyzing the crash dump — is that ALPC itself is stable code that's been in the kernel since Windows 8. The probability of it being a Microsoft bug is close to zero. The real cause is almost always a third-party driver that's writing past a buffer boundary, or memory that's physically degraded. To prevent this recurring: keep only essential third-party drivers installed, never use "driver updater" tools (they push beta or mismatched versions), and run memtest86 once a year if you're on older RAM. If you're on a laptop and got this error after a drop or spill, replace the RAM first — that's likely the root cause, not a software bug.