/mnt/cache can't be unmounted

[thatnovaguy]

I'm running into an issue where /mnt/cache can't be unmounted during array stop.

When poking around with losetup I found that /dev/loop1 is hanging.

root@HTPC:/# lsof /dev/loop1
COMMAND     PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
sh         5078 root  cwd    DIR   0,25      100   98 /usr/local/emhttp
sh         5080 root  cwd    DIR   0,25      100   98 /usr/local/emhttp
inotifywa  5081 root  cwd    DIR   0,25      100   98 /usr/local/emhttp
sleep      6891 root  cwd    DIR   0,25      100   98 /usr/local/emhttp
sleep      8080 root  cwd    DIR   0,25      100   98 /usr/local/emhttp
notify_po  8828 root  cwd    DIR   0,25      100   98 /usr/local/emhttp
session_c  8830 root  cwd    DIR   0,25      100   98 /usr/local/emhttp
system_te  8832 root  cwd    DIR   0,25      100   98 /usr/local/emhttp
device_li  9114 root  cwd    DIR   0,25      100   98 /usr/local/emhttp
disk_load  9116 root  cwd    DIR   0,25      100   98 /usr/local/emhttp
parity_li  9118 root  cwd    DIR   0,25      100   98 /usr/local/emhttp
php-fpm   13024 root  cwd    DIR   0,25      100   98 /usr/local/emhttp
php-fpm   14051 root  cwd    DIR   0,25      100   98 /usr/local/emhttp
php-fpm   15734 root  cwd    DIR   0,25      100   98 /usr/local/emhttp
php-fpm   17750 root  cwd    DIR   0,25      100   98 /usr/local/emhttp
autofan   20735 root  cwd    DIR   0,25      100   98 /usr/local/emhttp
ttyd      26217 root  cwd    DIR   0,25      100   98 /usr/local/emhttp

Just guessing by the "autofan" in the list  I'm assuming this is happening because of plugins.

Is this a known bug since 6.12.2?

 

EDIT: umount -l /dev/loop1 doesn't work either

root@HTPC:/# umount -l /dev/loop1
umount: /dev/loop1: umount failed: Invalid argument.

 

Edited July 9, 2023 by thatnovaguy

[ljm42]

Please see if this applies: https://forums.unraid.net/topic/141479-6122-array-stop-stuck-on-retry-unmounting-disk-shares/#comment-1281063

 

[thatnovaguy]

14 hours ago, ljm42 said:

Please see if this applies: https://forums.unraid.net/topic/141479-6122-array-stop-stuck-on-retry-unmounting-disk-shares/#comment-1281063

 

Thank you I'll keep an eye on it. I wasn't able to use umount the last time it happened, though.

[ljm42]

When you run losetup, does /dev/loop1 point to /boot/bzfirmware? If so, that does *not* need to be unmounted to stop the array (and it shouldn't be).  Same with /boot/bzmodules.

 

The one loopback that does need to be unmounted is docker.img