[Magisk] BertlBrown:
I get the Error 13 at mount, mentioned for earlier releases, but I think the reason is different this time:

[*]E Magisk : mount /dev/block/loop0 -> /sbin/.core/img failed with 13: Permission denied
​

I installed Magisk v15.3 (1531) on Vernee Mix 2 using Magisk Manager and a clean Boot.img from Vendor, keeping "force encryption" and "dm-verity".

I gained root and it is hidden for selected apps. There have been no errors during install.

But I can't install any module and hiding properties doesn't work due to the mount error.

Using Termux and su I found, that /dev/loop* are missing on my device. losetup does not work:

# losetup -f test

losetup: /dev/loop1: No such file or directory
​

Vendors Rom with used boot.img: http://www.mediafire.com/folder/5s9cio5rgwh9r/MIX2

Magisk Log:

02-03 07:50:06.253 312 312 I Magisk : Magisk v15.3(1531) daemon started

02-03 07:50:06.262 312 318 I Magisk : ** post-fs mode running

02-03 07:50:53.874 312 1997 I Magisk : ** post-fs-data mode running

02-03 08:50:53.880 312 1997 I Magisk : * Creating /sbin overlay

02-03 08:50:53.881 312 1997 I Magisk : * Mounting mirrors

02-03 08:50:53.882 312 1997 I Magisk : mount: /sbin/.core/mirror/system

02-03 08:50:53.882 312 1997 I Magisk : link: /sbin/.core/mirror/vendor

02-03 08:50:53.883 312 1997 I Magisk : bind_mount: /sbin/.core/mirror/bin

02-03 08:50:53.883 312 1997 I Magisk : * Setting up internal busybox

02-03 08:50:53.908 312 1997 I Magisk : * Merging /data/adb/magisk_merge.img -> /data/adb/magisk.img

02-03 08:50:54.009 312 1997 E Magisk : mount /dev/block/loop0->/dev/source failed with 13: Permission denied

02-03 08:50:54.046 312 1997 E Magisk : mount /dev/block/loop1->/dev/target failed with 13: Permission denied

02-03 08:50:54.047 312 1997 E Magisk : umount /dev/source failed with 22: Invalid argument

02-03 08:50:54.047 312 1997 E Magisk : umount /dev/target failed with 22: Invalid argument

02-03 08:50:54.049 312 1997 I Magisk : * Mounting /data/adb/magisk.img

02-03 08:50:54.097 312 1997 E Magisk : mount /dev/block/loop0->/sbin/.core/img failed with 13: Permission denied

02-03 08:50:54.097 312 1997 E Magisk : umount /sbin/.core/img failed with 22: Invalid argument

02-03 08:50:54.157 312 1997 E Magisk : mount /dev/block/loop0->/sbin/.core/img failed with 13: Permission denied

02-03 08:50:54.157 312 1997 I Magisk : * Running post-fs-data.d scripts

02-03 08:50:54.157 312 1997 I Magisk : * Running module post-fs-data scripts

02-03 08:50:54.157 312 1997 I Magisk : * Loading modules

02-03 08:50:54.158 312 2010 I Magisk : * Starting MagiskHide

02-03 08:50:54.158 312 2010 I Magisk : hide_utils: Hiding sensitive props

02-03 08:50:54.158 312 2010 E Magisk : fopen: /sbin/.core/img/.core/hidelist failed with 2: No such file or directory

02-03 08:50:54.158 312 2010 I Magisk : hide_list add: [com.google.android.gms.unstable]

02-03 08:50:54.187 312 2010 I Magisk : proc_monitor: init ns=mnt:[4026531840]

02-03 08:50:55.308 312 2190 I Magisk : ** late_start service mode running

02-03 08:50:55.308 312 2190 I Magisk : * Running service.d scripts

02-03 08:50:55.310 312 2190 I Magisk : * Running module service scripts

02-03 08:50:56.171 312 2010 E Magisk : open: /proc/2331/comm failed with 2: No such file or directory

02-03 08:50:56.653 312 2010 I Magisk : proc_monitor: zygote ns=mnt:[4026533971] zygote64 ns=mnt:[4026533970]

02-03 08:51:16.126 312 2010 I Magisk : proc_monitor: com.google.android.gms.unstable (PID=4475 ns=mnt:[4026534035])

02-03 09:01:37.012 312 2010 I Magisk : proc_monitor: com.google.android.gms.unstable (PID=7108 ns=mnt:[4026534024])

02-03 17:30:02.351 312 2010 I Magisk : proc_monitor: com.google.android.gms.unstable (PID=26311 ns=mnt:[4026534027])
​

Before trying to install a module, the part between 'Setting up internal busybox' and 'Mounting /data/adb/magisk.img' has been absent but the error 13 with mounting magisk.img had been there from the beginning.

Rebooting multiple times did not help.