Unable to mount /system RW in Android Q

[1dopewrx]

I am unable to mount /system in Android Q on my Pixel 2 XL either in TWRP or through terminal/ADB. I've tried rooting through patching boot.img as well as traditional through TWRP and same result. A thread on XDA has people pointing towards it being a magisk problem. Could this be possible?

[topjohnwu]

If you are unable to mount system as rw in TWRP, then it is not a Magisk problem, but the new way Google is dealing with their system partitions

[Octal450]

Will this be fixed at some point? I'd like to be able to debloat my device.

I though the partition scheme was only modified on the Pixel 3 and not the older Pixels?

EDIT: Canary no luck either

Kind Regards, Josh

[3c71]

From what I read, it appears that since Android 9, /system partition is actually in / partition. Have you tried mount -o rw,remount / instead?

I tried on a Pie and a Q device, no luck on either of them. Tried on Android 6 with Magisk, same result whether I use / or /system !? Then went on a SuperSU device, all ok.

Any news on this?

[topjohnwu]

Android Q uses EXT4 dedup filesystem, which is not writable. More info here: https://twitter.com/topjohnwu/status/1170404631865778177

[Jaapp-]

Just to add a datapoint, after disabling MagiskHide I could remount through adb with more progress, but it still didn't work:

[libfs_mgr]dt_fstab: Using a specified mount point /system_root for system
[libfs_mgr]dt_fstab: Using a specified mount point /system_root for system
[libfs_mgr]dt_fstab: Using a specified mount point /system_root for system
E failed to remount partition dev:/dev/block/platform/soc/c0c4000.sdhci/by-name/system mnt:/system_root: No such file or directory
/system/bin/remount exited with status 10
remount failed

Afterwards (previous step might or might not be necessary), running adb remount -o rw,remount / in a shell did work for me while adb remount -o rw,remount /system didn't.

[st4ycool]

Why you never mention that problems in faq? It takes so much time to discover by yourself

[plakat3]

Well then I don't see a point of rooting the phone. Wanted to change hosts file and this is one of the main reason for me to root it.

[Uj947nXmRqV2nRaWshKtHzTvckUUpD]

you can change hosts file systemlessly with adaway after you enable systemless hosts in magisk