Home Categories runtime Products Windows blue screen APC_INDEX_MISMATCH Windows Bug Check
Windows blue screen APC_INDEX_MISMATCH Bug Check 0x1: APC_INDEX_MISMATCH Windows stopped with an APC_INDEX_MISMATCH bug check because a kernel routine or driver created an invalid asynchronous procedure call state. This usually points to a buggy driver, filter driver, or low-level system component mismanaging APC disable and re-enable behavior.
Observed message
Bug Check 0x1: APC_INDEX_MISMATCH Why it happens
A kernel-mode driver mismatched the sequence of calls that disable and re-enable APCs. A file-system, antivirus, backup, or filter driver corrupted thread APC state. A recent low-level driver or system software change introduced invalid APC handling. How to fix it
Roll back or update recently installed low-level drivers first, especially antivirus, backup, storage, and virtualization components. If the crashes began after a Windows or driver update, test with the most likely suspect removed or reverted. Use crash dumps and stack traces where available to identify the repeated driver or routine involved in the APC mismatch. Check for BIOS, chipset, and storage-driver updates if the stop code tracks to a platform-level driver path. 