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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| outdated.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> | |
| <h2 id="3rd-party-software">3rd Party Software</h2> | |
| <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="sqlite3-plex-jellyfin-do-not-work-with-mergerfs">SQLite3, Plex, Jellyfin do not 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 they are 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. See <a href="../faq/recommendations_and_warnings/">What should | |
| mergerfs NOT be used for?</a>.</p> | |
| <p>Other software that leverages <strong>sqlite3</strong> which require <strong>mmap</strong> | |
| includes Radarr, Sonarr, and Lidarr. That said many programs use | |
| <strong>sqlite3</strong> and do not require <strong>mmap</strong>.</p> | |
| <p>It is recommended that you reach out to the developers of the software | |
| you are 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>. That said a full scan will pick | |
| up all media and it will put less load on the host to use time based | |
| library scans or to configure downloading software to trigger a scan | |
| when files are added to the pool. See <a href="../faq/compatibility_and_integration/#does-inotify-and-fanotify-work">Does inotify and fanotify | |
| work?</a> | |
| for more details.</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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