kernel: FS-Cache: Duplicate cookie detected - what is this?












1















In Arch Linux, after installing the most recent updates today, I see the following errors in the journal:



kernel: FS-Cache: Duplicate cookie detected
kernel: FS-Cache: O-cookie


There are about 20 lines in total that are like these. I don't find any info on this via a search. Is this a serious or known problem?



My CPU is an Intel Core i7 with an Asus motherboard. I can provide any requested relevant info. However, at this moment, I don't know what I'm looking at, so I am not sure what info is relevant.



UPDATE: on a 2nd reboot there are fewer of the messages. Here is the complete output of journalctl -b -p err



kernel: FS-Cache: Duplicate cookie detected
kernel: FS-Cache: O-cookie c=000000001e72b895 [p=0000000089da8da7 fl=222 nc=0 na=1]
kernel: FS-Cache: O-cookie d=00000000c3a2cbed n=00000000f757123a
kernel: FS-Cache: O-key=[10] '040002000801c0a805c3'
kernel: FS-Cache: N-cookie c=00000000ea48db1d [p=0000000089da8da7 fl=2 nc=0 na=1]
kernel: FS-Cache: N-cookie d=00000000c3a2cbed n=000000000f72327e
kernel: FS-Cache: N-key=[10] '040002000801c0a805c3'









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    1















    In Arch Linux, after installing the most recent updates today, I see the following errors in the journal:



    kernel: FS-Cache: Duplicate cookie detected
    kernel: FS-Cache: O-cookie


    There are about 20 lines in total that are like these. I don't find any info on this via a search. Is this a serious or known problem?



    My CPU is an Intel Core i7 with an Asus motherboard. I can provide any requested relevant info. However, at this moment, I don't know what I'm looking at, so I am not sure what info is relevant.



    UPDATE: on a 2nd reboot there are fewer of the messages. Here is the complete output of journalctl -b -p err



    kernel: FS-Cache: Duplicate cookie detected
    kernel: FS-Cache: O-cookie c=000000001e72b895 [p=0000000089da8da7 fl=222 nc=0 na=1]
    kernel: FS-Cache: O-cookie d=00000000c3a2cbed n=00000000f757123a
    kernel: FS-Cache: O-key=[10] '040002000801c0a805c3'
    kernel: FS-Cache: N-cookie c=00000000ea48db1d [p=0000000089da8da7 fl=2 nc=0 na=1]
    kernel: FS-Cache: N-cookie d=00000000c3a2cbed n=000000000f72327e
    kernel: FS-Cache: N-key=[10] '040002000801c0a805c3'









    share|improve this question














    bumped to the homepage by Community 14 mins ago


    This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.


















      1












      1








      1


      1






      In Arch Linux, after installing the most recent updates today, I see the following errors in the journal:



      kernel: FS-Cache: Duplicate cookie detected
      kernel: FS-Cache: O-cookie


      There are about 20 lines in total that are like these. I don't find any info on this via a search. Is this a serious or known problem?



      My CPU is an Intel Core i7 with an Asus motherboard. I can provide any requested relevant info. However, at this moment, I don't know what I'm looking at, so I am not sure what info is relevant.



      UPDATE: on a 2nd reboot there are fewer of the messages. Here is the complete output of journalctl -b -p err



      kernel: FS-Cache: Duplicate cookie detected
      kernel: FS-Cache: O-cookie c=000000001e72b895 [p=0000000089da8da7 fl=222 nc=0 na=1]
      kernel: FS-Cache: O-cookie d=00000000c3a2cbed n=00000000f757123a
      kernel: FS-Cache: O-key=[10] '040002000801c0a805c3'
      kernel: FS-Cache: N-cookie c=00000000ea48db1d [p=0000000089da8da7 fl=2 nc=0 na=1]
      kernel: FS-Cache: N-cookie d=00000000c3a2cbed n=000000000f72327e
      kernel: FS-Cache: N-key=[10] '040002000801c0a805c3'









      share|improve this question














      In Arch Linux, after installing the most recent updates today, I see the following errors in the journal:



      kernel: FS-Cache: Duplicate cookie detected
      kernel: FS-Cache: O-cookie


      There are about 20 lines in total that are like these. I don't find any info on this via a search. Is this a serious or known problem?



      My CPU is an Intel Core i7 with an Asus motherboard. I can provide any requested relevant info. However, at this moment, I don't know what I'm looking at, so I am not sure what info is relevant.



      UPDATE: on a 2nd reboot there are fewer of the messages. Here is the complete output of journalctl -b -p err



      kernel: FS-Cache: Duplicate cookie detected
      kernel: FS-Cache: O-cookie c=000000001e72b895 [p=0000000089da8da7 fl=222 nc=0 na=1]
      kernel: FS-Cache: O-cookie d=00000000c3a2cbed n=00000000f757123a
      kernel: FS-Cache: O-key=[10] '040002000801c0a805c3'
      kernel: FS-Cache: N-cookie c=00000000ea48db1d [p=0000000089da8da7 fl=2 nc=0 na=1]
      kernel: FS-Cache: N-cookie d=00000000c3a2cbed n=000000000f72327e
      kernel: FS-Cache: N-key=[10] '040002000801c0a805c3'






      kernel cache






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      asked Jun 18 '18 at 22:39









      MountainXMountainX

      5,0482672131




      5,0482672131





      bumped to the homepage by Community 14 mins ago


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      bumped to the homepage by Community 14 mins ago


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          1 Answer
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          0














          There is a bug report open about this topic on ArchLinux bug tracker :
          https://bugs.archlinux.org/task/59058






          share|improve this answer
























          • That's the bug report I filed. However, I learned that bugs.archlinux.org is not the right place for this bug report. People with this issue should contact upstream using linux-cachefs@redhat.com (moderated list) or linux-kernel@vger.kernel.org (open list). Also, there is a better bug report here: bugzilla.kernel.org/show_bug.cgi?id=200145

            – MountainX
            Jun 23 '18 at 16:00











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          1 Answer
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          0














          There is a bug report open about this topic on ArchLinux bug tracker :
          https://bugs.archlinux.org/task/59058






          share|improve this answer
























          • That's the bug report I filed. However, I learned that bugs.archlinux.org is not the right place for this bug report. People with this issue should contact upstream using linux-cachefs@redhat.com (moderated list) or linux-kernel@vger.kernel.org (open list). Also, there is a better bug report here: bugzilla.kernel.org/show_bug.cgi?id=200145

            – MountainX
            Jun 23 '18 at 16:00
















          0














          There is a bug report open about this topic on ArchLinux bug tracker :
          https://bugs.archlinux.org/task/59058






          share|improve this answer
























          • That's the bug report I filed. However, I learned that bugs.archlinux.org is not the right place for this bug report. People with this issue should contact upstream using linux-cachefs@redhat.com (moderated list) or linux-kernel@vger.kernel.org (open list). Also, there is a better bug report here: bugzilla.kernel.org/show_bug.cgi?id=200145

            – MountainX
            Jun 23 '18 at 16:00














          0












          0








          0







          There is a bug report open about this topic on ArchLinux bug tracker :
          https://bugs.archlinux.org/task/59058






          share|improve this answer













          There is a bug report open about this topic on ArchLinux bug tracker :
          https://bugs.archlinux.org/task/59058







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Jun 22 '18 at 5:03









          rhonrhon

          1




          1













          • That's the bug report I filed. However, I learned that bugs.archlinux.org is not the right place for this bug report. People with this issue should contact upstream using linux-cachefs@redhat.com (moderated list) or linux-kernel@vger.kernel.org (open list). Also, there is a better bug report here: bugzilla.kernel.org/show_bug.cgi?id=200145

            – MountainX
            Jun 23 '18 at 16:00



















          • That's the bug report I filed. However, I learned that bugs.archlinux.org is not the right place for this bug report. People with this issue should contact upstream using linux-cachefs@redhat.com (moderated list) or linux-kernel@vger.kernel.org (open list). Also, there is a better bug report here: bugzilla.kernel.org/show_bug.cgi?id=200145

            – MountainX
            Jun 23 '18 at 16:00

















          That's the bug report I filed. However, I learned that bugs.archlinux.org is not the right place for this bug report. People with this issue should contact upstream using linux-cachefs@redhat.com (moderated list) or linux-kernel@vger.kernel.org (open list). Also, there is a better bug report here: bugzilla.kernel.org/show_bug.cgi?id=200145

          – MountainX
          Jun 23 '18 at 16:00





          That's the bug report I filed. However, I learned that bugs.archlinux.org is not the right place for this bug report. People with this issue should contact upstream using linux-cachefs@redhat.com (moderated list) or linux-kernel@vger.kernel.org (open list). Also, there is a better bug report here: bugzilla.kernel.org/show_bug.cgi?id=200145

          – MountainX
          Jun 23 '18 at 16:00


















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