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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/options/" class="md-nav__link">
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<span class="md-ellipsis">
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Options
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/deprecated_options/" class="md-nav__link">
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<span class="md-ellipsis">
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Deprecated Options
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/branches/" class="md-nav__link">
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<span class="md-ellipsis">
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branches
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/functions_categories_and_policies/" class="md-nav__link">
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<span class="md-ellipsis">
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functions, categories and policies
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/func_readdir/" class="md-nav__link">
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<span class="md-ellipsis">
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func.readdir
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/rename_and_link/" class="md-nav__link">
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<span class="md-ellipsis">
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rename and link
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/cache/" class="md-nav__link">
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<span class="md-ellipsis">
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caching
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/readahead/" class="md-nav__link">
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<span class="md-ellipsis">
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readahead
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/inodecalc/" class="md-nav__link">
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<span class="md-ellipsis">
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inodecalc
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/threads/" class="md-nav__link">
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<span class="md-ellipsis">
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threads
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/pin-threads/" class="md-nav__link">
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<span class="md-ellipsis">
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pin-threads
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/link_cow/" class="md-nav__link">
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<span class="md-ellipsis">
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link_cow
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/fuse_msg_size/" class="md-nav__link">
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<span class="md-ellipsis">
|
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fuse_msg_size
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/follow-symlinks/" class="md-nav__link">
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<span class="md-ellipsis">
|
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follow-symlinks
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/link-exdev/" class="md-nav__link">
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<span class="md-ellipsis">
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link-exdev
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/rename-exdev/" class="md-nav__link">
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<span class="md-ellipsis">
|
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rename-exdev
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../config/symlinkify/" class="md-nav__link">
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<span class="md-ellipsis">
|
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symlinkify
|
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
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<a href="../config/nullrw/" class="md-nav__link">
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<span class="md-ellipsis">
|
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nullrw
|
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</span>
|
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</a>
|
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</li>
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<li class="md-nav__item">
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<a href="../config/xattr/" class="md-nav__link">
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<span class="md-ellipsis">
|
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xattr
|
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../config/nfsopenhack/" class="md-nav__link">
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|
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<span class="md-ellipsis">
|
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nfsopenhack
|
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</span>
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</a>
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</li>
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<li class="md-nav__item">
|
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<a href="../config/statfs/" class="md-nav__link">
|
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|
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|
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<span class="md-ellipsis">
|
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statfs / statvfs
|
|
</span>
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../config/flush-on-close/" class="md-nav__link">
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<span class="md-ellipsis">
|
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flush-on-close
|
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</span>
|
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</a>
|
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</li>
|
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<li class="md-nav__item">
|
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<a href="../config/export-support/" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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export-support
|
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</span>
|
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</a>
|
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</li>
|
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</ul>
|
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</nav>
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</li>
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<li class="md-nav__item">
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<a href="../error_handling/" class="md-nav__link">
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<span class="md-ellipsis">
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Error Handling
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</span>
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</a>
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</li>
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<li class="md-nav__item">
|
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<a href="../runtime_interfaces/" class="md-nav__link">
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<span class="md-ellipsis">
|
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Runtime Interfaces
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</span>
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../remote_filesystems/" class="md-nav__link">
|
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|
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|
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<span class="md-ellipsis">
|
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Remote Filesystems
|
|
</span>
|
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../tips_notes/" class="md-nav__link">
|
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|
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<span class="md-ellipsis">
|
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Tips and Notes
|
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</span>
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</a>
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</li>
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<li class="md-nav__item md-nav__item--active">
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<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
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<label class="md-nav__link md-nav__link--active" for="__toc">
|
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<span class="md-ellipsis">
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Known Issues and Bugs
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</span>
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<span class="md-nav__icon md-icon"></span>
|
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</label>
|
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<a href="./" class="md-nav__link md-nav__link--active">
|
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|
|
|
|
<span class="md-ellipsis">
|
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Known Issues and Bugs
|
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</span>
|
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|
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</a>
|
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|
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|
|
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
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<label class="md-nav__title" for="__toc">
|
|
<span class="md-nav__icon md-icon"></span>
|
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Table of contents
|
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</label>
|
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<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
|
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|
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<li class="md-nav__item">
|
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<a href="#mergerfs" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
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mergerfs
|
|
</span>
|
|
</a>
|
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|
|
<nav class="md-nav" aria-label="mergerfs">
|
|
<ul class="md-nav__list">
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<li class="md-nav__item">
|
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<a href="#supplemental-user-groups" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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Supplemental user groups
|
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</span>
|
|
</a>
|
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</li>
|
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|
|
<li class="md-nav__item">
|
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<a href="#directory-mtime-is-not-being-updated" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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directory mtime is not being updated
|
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</span>
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</a>
|
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|
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</li>
|
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|
|
<li class="md-nav__item">
|
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<a href="#mv-mntpoolfoo-mntdisk1foo-removes-foo" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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'mv /mnt/pool/foo /mnt/disk1/foo' removes 'foo'
|
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</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
<li class="md-nav__item">
|
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<a href="#cached-memory-appears-greater-than-it-should-be" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
cached memory appears greater than it should be
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
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|
|
<li class="md-nav__item">
|
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<a href="#nfs-clients-returning-estale-stale-file-handle" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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NFS clients returning ESTALE / Stale file handle
|
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</span>
|
|
</a>
|
|
|
|
</li>
|
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|
|
<li class="md-nav__item">
|
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<a href="#rtorrent-fails-with-enodev-no-such-device" class="md-nav__link">
|
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<span class="md-ellipsis">
|
|
rtorrent fails with ENODEV (No such device)
|
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</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
<li class="md-nav__item">
|
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<a href="#plex-jellyfin-doesnt-work-with-mergerfs" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
Plex / Jellyfin doesn't work with mergerfs
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
<li class="md-nav__item">
|
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<a href="#when-a-program-tries-to-move-or-rename-a-file-it-fails" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
When a program tries to move or rename a file it fails
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</span>
|
|
</a>
|
|
|
|
</li>
|
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|
|
<li class="md-nav__item">
|
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<a href="#my-32bit-software-has-problems" class="md-nav__link">
|
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<span class="md-ellipsis">
|
|
my 32bit software has problems
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
<li class="md-nav__item">
|
|
<a href="#moving-files-and-directories-fails-with-samba" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
Moving files and directories fails with Samba
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
<li class="md-nav__item">
|
|
<a href="#trashing-files-occasionally-fails" class="md-nav__link">
|
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<span class="md-ellipsis">
|
|
Trashing files occasionally fails
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
</ul>
|
|
</nav>
|
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|
</li>
|
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|
|
<li class="md-nav__item">
|
|
<a href="#fuse-and-linux-kernel" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
FUSE and Linux kernel
|
|
</span>
|
|
</a>
|
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|
|
<nav class="md-nav" aria-label="FUSE and Linux kernel">
|
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<ul class="md-nav__list">
|
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|
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<li class="md-nav__item">
|
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<a href="#nfs-and-eio-errors" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
NFS and EIO errors
|
|
</span>
|
|
</a>
|
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|
|
</li>
|
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|
|
<li class="md-nav__item">
|
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<a href="#truncated-files" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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Truncated files
|
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</span>
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|
</a>
|
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|
</li>
|
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|
|
<li class="md-nav__item">
|
|
<a href="#crashing-on-openvz" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
Crashing on OpenVZ
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
<li class="md-nav__item">
|
|
<a href="#really-bad-mmap-performance" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
Really bad mmap performance
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
<li class="md-nav__item">
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Heavy load and memory pressure leads to kernel panic
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<article class="md-content__inner md-typeset">
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<a href="https://github.com/trapexit/mergerfs/tree/master/mkdocs/docs/known_issues_bugs.md" title="Edit this page" class="md-content__button md-icon">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M10 20H6V4h7v5h5v3.1l2-2V8l-6-6H6c-1.1 0-2 .9-2 2v16c0 1.1.9 2 2 2h4zm10.2-7c.1 0 .3.1.4.2l1.3 1.3c.2.2.2.6 0 .8l-1 1-2.1-2.1 1-1c.1-.1.2-.2.4-.2m0 3.9L14.1 23H12v-2.1l6.1-6.1z"/></svg>
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<a href="https://github.com/trapexit/mergerfs/tree/master/mkdocs/docs/known_issues_bugs.md" title="View source of this page" class="md-content__button md-icon">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M17 18c.56 0 1 .44 1 1s-.44 1-1 1-1-.44-1-1 .44-1 1-1m0-3c-2.73 0-5.06 1.66-6 4 .94 2.34 3.27 4 6 4s5.06-1.66 6-4c-.94-2.34-3.27-4-6-4m0 6.5a2.5 2.5 0 0 1-2.5-2.5 2.5 2.5 0 0 1 2.5-2.5 2.5 2.5 0 0 1 2.5 2.5 2.5 2.5 0 0 1-2.5 2.5M9.27 20H6V4h7v5h5v4.07c.7.08 1.36.25 2 .49V8l-6-6H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h4.5a8.2 8.2 0 0 1-1.23-2"/></svg>
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</a>
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<h1 id="known-issues-and-bugs">Known Issues and Bugs</h1>
|
|
<h2 id="mergerfs">mergerfs</h2>
|
|
<h3 id="supplemental-user-groups">Supplemental user groups</h3>
|
|
<p>Due to the overhead of
|
|
<a href="http://linux.die.net/man/2/setgroups">getgroups/setgroups</a> mergerfs
|
|
utilizes a cache. This cache is opportunistic and per thread. Each
|
|
thread will query the supplemental groups for a user when that
|
|
particular thread needs to change credentials and will keep that data
|
|
for the lifetime of the thread. This means that if a user is added to
|
|
a group it may not be picked up without the restart of
|
|
mergerfs. In the future this may be improved to allow a periodic or
|
|
manual clearing of the cache.</p>
|
|
<p>While not a bug some users have found when using containers that
|
|
supplemental groups defined inside the container don't work as
|
|
expected. Since mergerfs lives outside the container it is querying
|
|
the host's group database. Effectively containers have their own user
|
|
and group definitions unless setup otherwise just as different systems
|
|
would.</p>
|
|
<p>Users should mount in the host group file into the containers or use a
|
|
standard shared user & groups technology like NIS or LDAP.</p>
|
|
<h3 id="directory-mtime-is-not-being-updated">directory mtime is not being updated</h3>
|
|
<p>Remember that the default policy for <code>getattr</code> is <code>ff</code>. The
|
|
information for the first directory found will be returned. If it
|
|
wasn't the directory which had been updated then it will appear
|
|
outdated.</p>
|
|
<p>The reason this is the default is because any other policy would be
|
|
more expensive and for many applications it is unnecessary. To always
|
|
return the directory with the most recent mtime or a faked value based
|
|
on all found would require a scan of all filesystems.</p>
|
|
<p>If you always want the directory information from the one with the
|
|
most recent mtime then use the <code>newest</code> policy for <code>getattr</code>.</p>
|
|
<h3 id="mv-mntpoolfoo-mntdisk1foo-removes-foo">'mv /mnt/pool/foo /mnt/disk1/foo' removes 'foo'</h3>
|
|
<p>This is not a bug.</p>
|
|
<p>Run in verbose mode to better understand what's happening:</p>
|
|
<div class="language-text highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>$ mv -v /mnt/pool/foo /mnt/disk1/foo
|
|
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>copied '/mnt/pool/foo' -> '/mnt/disk1/foo'
|
|
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a>removed '/mnt/pool/foo'
|
|
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a>$ ls /mnt/pool/foo
|
|
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a>ls: cannot access '/mnt/pool/foo': No such file or directory
|
|
</span></code></pre></div>
|
|
<p><code>mv</code>, when working across devices, is copying the source to target and
|
|
then removing the source. Since the source <strong>is</strong> the target in this
|
|
case, depending on the unlink policy, it will remove the just copied
|
|
file and other files across the branches.</p>
|
|
<p>If you want to move files to one filesystem just copy them there and
|
|
use mergerfs.dedup to clean up the old paths or manually remove them
|
|
from the branches directly.</p>
|
|
<h3 id="cached-memory-appears-greater-than-it-should-be">cached memory appears greater than it should be</h3>
|
|
<p>Use <code>cache.files=off</code> and/or <code>dropcacheonclose=true</code>. See the section
|
|
on <a href="../config/cache/">page caching</a>.</p>
|
|
<h3 id="nfs-clients-returning-estale-stale-file-handle">NFS clients returning ESTALE / Stale file handle</h3>
|
|
<p>NFS generally does not like out of band changes. Take a look at the
|
|
section on NFS in the <a href="../remote_filesystems/">remote-filesystems</a> for
|
|
more details.</p>
|
|
<h3 id="rtorrent-fails-with-enodev-no-such-device">rtorrent fails with ENODEV (No such device)</h3>
|
|
<p>Be sure to set
|
|
<a href="../config/cache/">cache.files=partial|full|auto-full|per-process</a>
|
|
or use Linux kernel v6.6 or above. rtorrent and some other
|
|
applications use <a href="http://linux.die.net/man/2/mmap">mmap</a> to read and
|
|
write to files and offer no fallback to traditional methods.</p>
|
|
<h3 id="plex-jellyfin-doesnt-work-with-mergerfs">Plex / Jellyfin doesn't work with mergerfs</h3>
|
|
<p>It does. If you're trying to put the software's config / metadata /
|
|
database on mergerfs you can't set
|
|
<a href="../config/cache/">cache.files=off</a> (unless you use Linux v6.6 or
|
|
above) because Plex is using <strong>sqlite3</strong> with <strong>mmap</strong> enabled.</p>
|
|
<p>That said it is recommended that config and runtime files be stored on
|
|
SSDs on a regular filesystem for performance reasons and if you are
|
|
using HDDs in your pool to help limit spinup.</p>
|
|
<p>Other software that leverages <strong>sqlite3</strong> which require <strong>mmap</strong>
|
|
includes Radarr, Sonarr, Lidarr.</p>
|
|
<p>It is recommended that you reach out to the developers of the software
|
|
you're having troubles with and asking them to add a fallback to
|
|
regular file IO when <strong>mmap</strong> is unavailable. It is not only more
|
|
compatible and resilient but also can be more performant in certain
|
|
situations.</p>
|
|
<p>If the issue is that quick scanning doesn't seem to pick up media then
|
|
be sure to set <code>func.getattr=newest</code>, though generally, a full scan
|
|
will pick up all media anyway.</p>
|
|
<h3 id="when-a-program-tries-to-move-or-rename-a-file-it-fails">When a program tries to move or rename a file it fails</h3>
|
|
<p>Please read the docs regarding <a href="../config/functions_categories_and_policies/#rename-and-link">rename and
|
|
link</a>.</p>
|
|
<p>The problem is that many applications do not properly handle <code>EXDEV</code>
|
|
errors which <code>rename</code> and <code>link</code> may return even though they are
|
|
perfectly valid situations which do not indicate actual device,
|
|
filesystem, or OS errors. The error will only be returned by mergerfs
|
|
if using a path preserving policy as described in the policy section
|
|
above. If you do not care about path preservation simply change the
|
|
mergerfs policy to the non-path preserving version. For example: <code>-o
|
|
category.create=mfs</code> Ideally the offending software would be fixed and
|
|
it is recommended that if you run into this problem you contact the
|
|
software's author and request proper handling of <code>EXDEV</code> errors.</p>
|
|
<h3 id="my-32bit-software-has-problems">my 32bit software has problems</h3>
|
|
<p>Some software have problems with 64bit inode values. The symptoms can
|
|
include EOVERFLOW errors when trying to list files. You can address
|
|
this by setting <code>inodecalc</code> to one of the 32bit based algos as
|
|
described in the relevant section.</p>
|
|
<h3 id="moving-files-and-directories-fails-with-samba">Moving files and directories fails with Samba</h3>
|
|
<p>Workaround: Copy the file/directory and then remove the original
|
|
rather than move.</p>
|
|
<p>This isn't an issue with Samba but some SMB clients. GVFS-fuse v1.20.3
|
|
and prior (found in Ubuntu 14.04 among others) failed to handle
|
|
certain error codes correctly. Particularly <code>STATUS_NOT_SAME_DEVICE</code>
|
|
which comes from the <code>EXDEV</code> that is returned by <code>rename</code> when the
|
|
call is crossing mount points. When a program gets an <code>EXDEV</code> it needs
|
|
to explicitly take an alternate action to accomplish its goal. In the
|
|
case of <code>mv</code> or similar it tries <code>rename</code> and on <code>EXDEV</code> falls back to
|
|
a copying the file to the destination and deleting the source. In
|
|
these older versions of GVFS-fuse if it received <code>EXDEV</code> it would
|
|
translate that into <code>EIO</code>. This would cause <code>mv</code> or most any
|
|
application attempting to move files around on that SMB share to fail
|
|
with a generic IO error.</p>
|
|
<p><a href="https://bugzilla.gnome.org/show_bug.cgi?id=734568">GVFS-fuse v1.22.0</a>
|
|
and above fixed this issue but a large number of systems use the older
|
|
release. On Ubuntu, the version can be checked by issuing <code>apt-cache
|
|
showpkg gvfs-fuse</code>. Most distros released in 2015 seem to have the
|
|
updated release and will work fine but older systems may
|
|
not. Upgrading gvfs-fuse or the distro in general will address the
|
|
problem.</p>
|
|
<p>In Apple's MacOSX 10.9 they replaced Samba (client and server) with
|
|
their own product. It appears their new client does not handle
|
|
<code>EXDEV</code> either and responds similarly to older releases of gvfs on
|
|
Linux.</p>
|
|
<h3 id="trashing-files-occasionally-fails">Trashing files occasionally fails</h3>
|
|
<p>This is the same issue as with Samba. <code>rename</code> returns <code>EXDEV</code> (in our
|
|
case that will really only happen with path preserving policies like
|
|
<code>epmfs</code>) and the software doesn't handle the situation well. This is
|
|
unfortunately a common failure of software which moves files
|
|
around. The standard indicates that an implementation <strong>MAY</strong> choose
|
|
to support non-user home directory trashing of files (which is a
|
|
<strong>MUST</strong>). The implementation <strong>MAY</strong> also support "top directory
|
|
trashes" which many probably do.</p>
|
|
<p>To create a <code>$topdir/.Trash</code> directory as defined in the standard use
|
|
the <a href="https://github.com/trapexit/mergerfs-tools">mergerfs-tools</a> tool
|
|
<code>mergerfs.mktrash</code>.</p>
|
|
<h2 id="fuse-and-linux-kernel">FUSE and Linux kernel</h2>
|
|
<p>There have been a number of kernel issues / bugs over the years which
|
|
mergerfs has run into. Here is a list of them for reference and
|
|
posterity.</p>
|
|
<h3 id="nfs-and-eio-errors">NFS and EIO errors</h3>
|
|
<p><a href="https://lore.kernel.org/linux-fsdevel/20240228160213.1988854-1-mszeredi@redhat.com/T/">https://lore.kernel.org/linux-fsdevel/20240228160213.1988854-1-mszeredi@redhat.com/T/</a></p>
|
|
<p>Over the years some users have reported that while exporting mergerfs
|
|
via NFS, after significant filesystem activity, not only will the NFS
|
|
client start returning ESTALE and EIO errors but mergerfs itself would
|
|
start returning EIO errors. The problem was that no one could
|
|
reliability reproduce the issue. After a string of reports in late
|
|
2023 and early 2024 more investigation was done.</p>
|
|
<p>In Linux 5.14 new validation was put into FUSE which caught a few
|
|
invalid situations and would tag a FUSE node as invalid if a check
|
|
failed. Such checks include invalid file type, changing of type from
|
|
one request to another, a size greater than 63bit, and the generation
|
|
of a inode changing while in use.</p>
|
|
<p>What happened was that mergerfs was using a different fixed, non-zero
|
|
value for the generation of all nodes as it was suggested that unique
|
|
inode + generation pairs are needed for proper integration with
|
|
NFS. That non-zero value was being sent back to the kernel when a
|
|
lookup request was made for root. The reason this was hard to track
|
|
down was because NFS almost uniquely uses an API which can lead to a
|
|
lookup of the root node that simply won't happen under normal
|
|
workloads and usage. And that lookup will only happen if child nodes
|
|
of the root were forgotten but NFS still had a handle to that node and
|
|
later asked for details about it. It would trigger a set of requests
|
|
to lookup info on those nodes.</p>
|
|
<p>This wasn't a bug in FUSE but mergerfs. However, the incorrect
|
|
behavior of mergerfs lead to FUSE behave in an unexpected and
|
|
incorrect manner. It would issue a lookup of the "parent of a child of
|
|
the root" and mergerfs would send the invalid generation value. As a
|
|
result the kernel would mark the root node as "bad" which would then
|
|
trigger the kernel to issue a "forget root" message. In between those
|
|
it would issue a request for the parent of the root... which doesn't
|
|
exist.</p>
|
|
<p>So the kernel was doing two invalid things. Requesting the parent of
|
|
the root and then when that failed issuing a forget for the
|
|
root. These led to chasing after the wrong possible causes.</p>
|
|
<p>The change was for FUSE to revert the marking of root node bad if the
|
|
generation is non-zero and warn about it. It will mark the node bad
|
|
but not unhash/forget/remove it.</p>
|
|
<p>mergerfs in v2.40.1 ensures that generation for root is always 0 on
|
|
lookup which should work across any kernel version.</p>
|
|
<h3 id="truncated-files">Truncated files</h3>
|
|
<p>This was a bug with <code>mmap</code> and <code>FUSE</code> on 32bit platforms. Should be fixed in all LTS releases.</p>
|
|
<ul>
|
|
<li><a href="https://marc.info/?l=linux-fsdevel&m=155550785230874&w=2">https://marc.info/?l=linux-fsdevel&m=155550785230874&w=2</a></li>
|
|
</ul>
|
|
<h3 id="crashing-on-openvz">Crashing on OpenVZ</h3>
|
|
<p>There was a bug in the OpenVZ kernel with regard to how it handles <code>ioctl</code> calls. It was making invalid requests which would lead to crashes due to mergerfs not expecting them.</p>
|
|
<ul>
|
|
<li><a href="https://bugs.openvz.org/browse/OVZ-7145">https://bugs.openvz.org/browse/OVZ-7145</a></li>
|
|
<li><a href="https://www.mail-archive.com/devel@openvz.org/msg37096.html">https://www.mail-archive.com/devel@openvz.org/msg37096.html</a></li>
|
|
</ul>
|
|
<h3 id="really-bad-mmap-performance">Really bad mmap performance</h3>
|
|
<p>There was a bug in caching which affects overall performance of <code>mmap</code> through <code>FUSE</code> in Linux 4.x kernels. It is fixed in 4.4.10 and 4.5.4.</p>
|
|
<ul>
|
|
<li><a href="https://lkml.org/lkml/2016/3/16/260">https://lkml.org/lkml/2016/3/16/260</a></li>
|
|
<li><a href="https://lkml.org/lkml/2016/5/11/59">https://lkml.org/lkml/2016/5/11/59</a></li>
|
|
</ul>
|
|
<h3 id="heavy-load-and-memory-pressure-leads-to-kernel-panic">Heavy load and memory pressure leads to kernel panic</h3>
|
|
<ul>
|
|
<li><a href="https://lkml.org/lkml/2016/9/14/527">https://lkml.org/lkml/2016/9/14/527</a></li>
|
|
<li><a href="https://lkml.org/lkml/2016/10/4/1">https://lkml.org/lkml/2016/10/4/1</a></li>
|
|
<li><a href="https://www.theregister.com/2016/10/05/linus_torvalds_admits_buggy_crap_made_it_into_linux_48/">https://www.theregister.com/2016/10/05/linus_torvalds_admits_buggy_crap_made_it_into_linux_48/</a></li>
|
|
</ul>
|
|
|
|
|
|
|
|
|
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|
|
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