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Date:   Tue, 5 Mar 2019 16:24:09 -0800 (PST)
From:   Christian Kujau <>
cc:     David Howells <>,
        Anna Schumaker <>,
        Steve Dickson <>
Subject: FS-Cache: Duplicate cookie detected


ever since ec0328e46d6e ("fscache: Maintain a catalogue of allocated 
cookies") was commited, people are seeing[0] those "Duplicate cookie 
detected" messages in syslog, see below. NFS and CIFS mounts appear to 
continue to work, but these messsages are new and I too am wondering if 
this is something to worry about.

They _are_ logged with pr_err in fs/fscache/cookie.c, but maybe this needs 
to be changed to a different loglevel?


 FS-Cache: Duplicate cookie detected
 FS-Cache: O-cookie c=000000009da9dbf0 [p=000000001593f904 fl=222 nc=0 na=1]
 FS-Cache: O-cookie d=00000000287febd9 n=00000000980c9e8a
 FS-Cache: O-key=[8] '020001bdc0a80064'
 FS-Cache: N-cookie c=00000000bfe3f869 [p=000000001593f904 fl=2 nc=0 na=1]
 FS-Cache: N-cookie d=00000000287febd9 n=00000000e153f178
 FS-Cache: N-key=[8] '020001bdc0a80064'

BOFH excuse #318:

Your EMAIL is now being delivered by the USPS.

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