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dc74104804
scoutfs_client_destroy nulled client->conn before scoutfs_net_free_conn had a chance to drain the conn's workqueue. An in-flight proc_worker running client_lock_recover dispatches scoutfs_lock_recover_request synchronously, which in turn calls scoutfs_client_lock_recover_response. That helper reads client->conn and hands it to scoutfs_net_response, so a racing NULL made submit_send dereference conn->lock and trip a KASAN null-ptr-deref followed by a GPF. Only became reachable in practice once reconnect started draining pending client requests with -ECONNRESET, because the farewell can now return while the server is still sending requests on the re-established socket. Reorder so scoutfs_net_free_conn runs first; its shutdown_worker drains conn->workq before any memory is freed, then client->conn is nulled. The original intent of nulling to catch buggy late callers is preserved. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Introduction
scoutfs is a clustered in-kernel Linux filesystem designed to support large archival systems. It features additional interfaces and metadata so that archive agents can perform their maintenance workflows without walking all the files in the namespace. Its cluster support lets deployments add nodes to satisfy archival tier bandwidth targets.
The design goal is to reach file populations in the trillions, with the archival bandwidth to match, while remaining operational and responsive.
Highlights of the design and implementation include:
- Fully consistent POSIX semantics between nodes
- Atomic transactions to maintain consistent persistent structures
- Integrated archival metadata replaces syncing to external databases
- Dynamic seperation of resources lets nodes write in parallel
- 64bit throughout; no limits on file or directory sizes or counts
- Open GPLv2 implementation
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