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PFN_SHARE_COUNT
The result bug check has a value of 0x0000001B.
This bug check code is no longer used by the Windows operating system.
Important
This topic is for programmers. If you are a customer who has received a blue screen error code while using your computer, see Troubleshoot blue screen errors.
Dump evidence for PFN_SHARE_COUNT
Preserve the complete dump, the four bug-check parameters, the exact Windows build, loaded-module list, and the event timeline immediately before the stop. AllStat summarizes the condition as “this result”; that sentence identifies the failure class, while the parameters and stack determine which object, driver, processor, or subsystem instance was involved.
Analysis order
- Run WinDbg
!analyze -v, then inspect the documented meaning of each parameter instead of relying only on the probably-caused-by line. - Find the earliest abnormal event: driver update, firmware change, device reset, storage error, verifier report, resource exhaustion, or application hang connected with pfn / share / count.
- keep third-party filter, security, storage, graphics, and virtualization drivers in the module inventory; removing evidence before dump analysis can obscure the responsible path.
Do not repeatedly reboot a machine affected by this result before collecting the dump and event logs. Recovery actions should follow the component identified by the stack and parameters, not merely the symbolic stop-code name.
Distinctive failure boundary
This result identifies page-frame share-count inconsistency. Examine the PFN database entry, share and reference counts, PTEs that map the page, locked-page activity, DMA buffers, and drivers that map or unmap physical pages.
Separating the result from neighboring bug checks
Memory diagnostics can rule out hardware, but a repeatable stack around page locking or MDL handling strongly suggests a driver accounting error. Preserve the original dump and use the documented parameters and stack to verify this distinction before changing drivers or platform configuration.
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