[Bug 205833] New: fsfreeze blocks close(fd) on xfs sometimes

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=205833

            Bug ID: 205833
           Summary: fsfreeze blocks close(fd) on xfs sometimes
           Product: File System
           Version: 2.5
    Kernel Version: 4.15.0-55-generic #60-Ubuntu
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: XFS
          Assignee: filesystem_xfs@kernel-bugs.kernel.org
          Reporter: kernel.org@estada.ch
        Regression: No

Dear all

I noticed the bug while setting up a backup with fsfreeze and restic.

How I reproduce it:

    1. Write multiple MB to a file (eg. 100MB) while after one or two MB freeze
the filesystem from the sidecar pod
    2. From the sidecar pod, issue multiple `strace tail /generated/data/0.txt`
    3. After a couple of tries strace shows that the `read(...)` works but
`close(...)` hangs
    4. From now on all `read(...)` operations are blocked until the freeze is
lifted

System: Ubuntu 18.04.3 LTS
CPU: Intel(R) Xeon(R) CPU X5650  @ 2.67GHz
Storage: /dev/mapper/mpathXX on /var/lib/kubelet/plugins/hpe.com/... type xfs
(rw,noatime,attr2,inode64,noquota)

I used this tool to generate the file. The number of concurrent files does not
appear to matter that much. I was able to trigger the bug, tested with 2, 4 and
32 parallel files:
https://gitlab.com/dns2utf8/multi_file_writer

Cheers,
Stefan

PS: I opened a bug at the tool vendor too:
https://github.com/vmware-tanzu/velero/issues/2113

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