What does BSOD 0x10B (DFSC_FILE_SYSTEM) mean?

DFSC_FILE_SYSTEM

DFS client file-system failure for DFSC_FILE_SYSTEM

DFSC_FILE_SYSTEM is bug check code 0x0000010B.

This bug check is a DFS client-side counterpart to DFS namespace handling. It points to client referral/cache/path state, redirector interaction, or filters in the UNC namespace path.

How to read it in a dump

• Use the stack to distinguish DFS client, MUP, SMB redirector, WebDAV, and third-party file-system filters.
• The failing workload can be target failover, referral cache update, reconnect, cleanup, or namespace traversal.
• It is not enough to test the server; the client-side namespace path can be the failing component.

What to check

• Check DFS namespace targets, referral timeouts, SMB redirector events, and file-system filters.
• Reproduce with a specific UNC path and compare behavior when bypassing DFS to a direct target.
• Correlate with network transitions and offline/online state.

References

• Microsoft clustering / DFS documentation
• Microsoft Bug Check Code Reference
• Crash dump files and WinDbg