a nfsd_file_free panic when shudown

[Wang Yugui <wangyugui@e16-tech.com>]

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Hi,

a nfsd_file_free panic when shudown.

This is a kernel 6.1.1 with some nfsd 6.2 pathes.
It happened when os shutdown.

but the reproducer is yet not clear.
we just gather the info of the attachment file.

the path list that applied to kernel 6.1.1.
Subject: nfsd: don't call nfsd_file_put from client states seqfile display
Subject: NFSD: Pass the target nfsd_file to nfsd_commit()
Subject: NFSD: Revert "NFSD: NFSv4 CLOSE should release an nfsd_file
Subject: NFSD: Add an NFSD_FILE_GC flag to enable nfsd_file garbage collection
Subject: nfsd: fix up the filecache laundrette scheduling
Subject: NFSD: Flesh out a documenting comment for filecache.c
Subject: NFSD: Clean up nfs4_preprocess_stateid_op() call sites
Subject: NFSD: Trace stateids returned via DELEGRETURN
Subject: NFSD: Trace delegation revocations
Subject: NFSD: Use const pointers as parameters to fh_ helpers
Subject: NFSD: Update file_hashtbl() helpers
Subject: NFSD: Clean up nfsd4_init_file()
Subject: NFSD: Add a nfsd4_file_hash_remove() helper
Subject: NFSD: Clean up find_or_add_file()
Subject: NFSD: Refactor find_file()
Subject: NFSD: Use rhashtable for managing nfs4_file objects
Subject: NFSD: Fix licensing header in filecache.c
Subject: nfsd: remove the pages_flushed statistic from filecache
Subject: nfsd: reorganize filecache.c
Subject: NFSD: Add an nfsd_file_fsync tracepoint
Subject: nfsd: rework refcounting in filecache
Subject: nfsd: under NFSv4.1, fix double svc_xprt_put on rpc_create failure
Subject: NFSD: fix use-after-free in __nfs42_ssc_open()


It happened just after 'Subject: nfsd: rework refcounting in filecache'
is added, so this patch maybe related.

Best Regards
Wang Yugui (wangyugui@e16-tech.com)
2022/12/22

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