[CIFS / SMB Stale File Handle]

For about a month, i was seeing this once or twice a day on my Linux Mint VM and couldn't figure out the cause (and having to umount/mount to correct it). I tried using NFS, various SMB versions, SMB options, all resulted in the same issue. As others have mentioned it didn't seem to be based on the amount of time it was mounted, rather the time after the previous write to that mount. 

 

I never discovered the source of the issue, but I have since switched to using autofs so that it unmounts and remounts the share dynamically. Since going to this, I've only had one instance of this issue come up and that was simply because I was inside the mounted share via command line and autofs couldn't unmount it. 

 

My setup uses a cache drive for writes on one of these shares, but not the other and both experienced the problem. The VM runs off the cache drive in case thats relevant at all. I also run the 'dynamix cache directories' plug in, but have it exclude one of these shares (the one that uses the cache disk for writes). But again, it still happens to both shares.

 

This has also only occurred on the new 6.8 and 6.8RC releases for me, but I built this server new and went straight to rc1 a few months ago so never attempted to run it on 6.7 and older.

[kernel error in syslog]

Has anyone found a solution to this issue, or did those kernel parameters fix your problem? I've only been running unraid for 2 months now, on the 6.7 RC code (and now 6.8), and have come across this twice. In each case, the server itself had been up for almost two weeks with plex running as a docker using the igpu the whole time (baring a restart of the docker for the occasional update). 

 

As an additional symptom of this issue, the whole Unraid box freezes (can't login to directly attached console or anything) and for some reason (that I cannot explain) it wipes out my whole wired network (I even replaced the attached switch when this happened the last time, rebooted router, wireless ran fine), but unless I unplugged the unraid box I got no network connectivity on other machines.

 

Machine specs:

i7-6700

Asus Z170-A on latest firmware

3 PCIe cards (additional network, graphics, LSI -Sas to Sata) 

 

From the Syslog (remote):

2019-12-2716:59:39   Error     kern   kernel    [drm:gen8_reset_engines [i915]] *ERROR* rcs0: reset request timeout

2019-12-2716:59:39   Error     kern   kernel   i915 0000:00:02.0: Failed to reset chip

2019-12-2716:59:38   Error     kern   kernel   [drm:gen8_reset_engines [i915]] *ERROR* rcs0: reset request timeout

2019-12-2716:59:38   Error     kern   kernel   [drm:gen8_reset_engines [i915]] *ERROR* rcs0: reset request timeout

2019-12-2716:59:38   Error     kern   kernel   [drm:gen8_reset_engines [i915]] *ERROR* rcs0: reset request timeout

2019-12-2716:59:38   Notice   kern   kernel   i915 0000:00:02.0: Resetting chip for hang on rcs0

2019-12-2716:59:38   Error     kern   kernel   [drm:gen8_reset_engines [i915]] *ERROR* rcs0: reset request timeout

2019-12-2716:59:38   Notice   kern   kernel   i915 0000:00:02.0: Resetting rcs0 for hang on rcs0

2019-12-2716:59:38   Information   kern   kernel   [drm] GPU HANG: ecode 9:0:0x96d1ccef, in Plex Transcoder [14234], reason: hang on rcs0, action: reset

[Unraid Forum 100K Giveaway]

Best thing about unraid is definitely the community engagement, everyone does a terrific job in responding to issues quickly. If I were to add something in 2020, it'd probably be to have multiple unraid pools on the same server.