[Bug 260453] ZFS truncated write to O_APPEND file from mmap'ed memory

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260453

            Bug ID: 260453
           Summary: ZFS truncated write to O_APPEND file from mmap'ed
                    memory
           Product: Base System
           Version: 13.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: phk@FreeBSD.org

Summary:
        A file is opened for O_APPEND
        writev(2) is called with 480 bytes from a mmap'ed neighbor file.
        writev(2) returns 480
        The file only grows by 194 bytes.

Seen on: 13.0p5, emaste reproduced on ref13-amd64

ZFS seems to be a requirement for the failure.

To reproduce:

        git clone https://github.com/bsdphk/AardWARC
        cd AardWARC
        make test  (The action happens in /tmp)

The bug triggers the following assert:

        Assert error in silo_attempt_append(), wsilo.c line 436:
          Condition((off_t)s == (after - before)) not true.

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