Re: a nfsd_file_free panic when shudown

[Wang Yugui <wangyugui@xxxxxxxxxxxx>]

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.

Now I can reproduce it.
1)  'tail -f xxx' to keep a file is open from nfs4 client
2) 'shutdow -r now' the nfs server.

more panic info in the attachment files (panic-2.txt/panic-3.txt)

Best Regards
Wang Yugui (wangyugui@xxxxxxxxxxxx)
2022/12/22

> 
> 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@xxxxxxxxxxxx)
> 2022/12/22

-- 
Wang Yugui <wangyugui@xxxxxxxxxxxx>

Attachment: panic-2.txt
Description: Binary data

Attachment: panic-3.txt
Description: Binary data