[Magisk] spambayes:
Lost root after v18.0. Rollback to v17.3 didn't help

Have been trying since yesterday to get things working. Multiple attempts at uninstalling through Manager or via TWRP uninstaller script together with multiple attempts at reinstalling v18 or v17.3. Nothing works.

I don't get any errors installing or uninstalling. But the phone isn't rooted after Magisk. Root apps do not trigger su requests and Magisk doesn't prompt. Something seems to be blocking.

A possible tell tale sign is that all the Magisk logs saved are 0 byte files. Some kind of permission error?

I've had to use copy for the following because saving doesn't work.

07-19 00:10:30.969 256 256 I Magisk : Magisk v17.3(17302) daemon started
07-19 00:10:30.989 260 260 I Magisk : Magisk v17.3(17302) logger started
07-19 00:10:30.989 256 257 I Magisk : ** post-fs-data mode running
07-19 00:10:30.989 256 257 I Magisk : Create /data/adb/magisk.img with size 64M
07-19 00:10:31.179 256 257 I Magisk : * Mounting /data/adb/magisk.img
07-19 00:10:31.199 256 257 I Magisk : * Running post-fs-data.d scripts
07-19 00:10:31.199 256 257 I Magisk : * Running module post-fs-data scripts
07-19 00:10:31.199 256 257 I Magisk : * Loading modules
07-19 00:10:31.199 256 273 I Magisk : * Starting MagiskHide
07-19 00:10:31.199 256 273 I Magisk : hide_utils: Hiding sensitive props
07-19 00:10:31.199 256 273 I Magisk : hide_list add: [com.google.android.gms.unstable]
07-19 00:10:31.239 256 273 E Magisk : proc_monitor: Your kernel doesn't support mount namespace :(
07-19 00:10:34.549 256 395 I Magisk : ** late_start service mode running
07-19 00:10:34.549 256 395 I Magisk : * Running service.d scripts
07-19 00:10:34.549 256 395 I Magisk : * Running module service scripts
07-19 00:10:34.549 256 400 I Magisk : * Starting MagiskHide
07-19 00:10:34.559 256 400 I Magisk : hide_utils: Hiding sensitive props
07-19 00:10:34.559 256 400 I Magisk : hide_list: [com.google.android.gms.unstable]
07-19 00:10:34.939 256 400 E Magisk : proc_monitor: Your kernel doesn't support mount namespace :(
12-14 08:46:48.406 7718 7718 E Magisk : write failed with 32: Broken pipe
12-14 08:46:48.406 7718 7718 E Magisk : readlink /proc/3998/cwd failed with 2: No such file or directory
12-14 08:46:48.406 7718 7718 E Magisk : read failed with 9: Bad file number
12-14 08:46:48.406 7718 7718 E Magisk : read failed with 9: Bad file number
12-14 08:46:48.406 7718 7718 E Magisk : read failed with 14: Bad address
12-14 08:46:48.406 7718 7718 E Magisk : read failed with 14: Bad address
12-14 08:46:48.406 7718 7718 E Magisk : dup2 failed with 9: Bad file number
12-14 08:46:48.406 7718 7718 E Magisk : dup2 failed with 9: Bad file number
12-14 08:46:48.406 7718 7718 E Magisk : dup2 failed with 9: Bad file number
12-14 08:46:48.406 7718 7718 W Magisk : su: request rejected (10270->0)
12-14 08:47:43.046 10492 10492 W Magisk : su: request rejected (10314->0)
12-14 08:48:09.676 11965 11965 E Magisk : write failed with 32: Broken pipe
12-14 08:48:09.676 11965 11965 E Magisk : readlink /proc/8908/cwd failed with 2: No such file or directory
12-14 08:48:09.676 11965 11965 E Magisk : read failed with 9: Bad file number
12-14 08:48:09.676 11965 11965 E Magisk : read failed with 9: Bad file number
12-14 08:48:09.676 11965 11965 E Magisk : read failed with 14: Bad address
12-14 08:48:09.676 11965 11965 E Magisk : read failed with 14: Bad address
12-14 08:48:09.676 11965 11965 E Magisk : stat icu failed with 2: No such file or directory
12-14 08:48:09.676 11965 11965 E Magisk : su: Wrong permission of pts_slave
12-14 08:48:55.166 14966 14966 W Magisk : su: request rejected (10270->0)
12-14 08:49:42.066 17408 17408 W Magisk : su: request rejected (10268->0)
12-14 08:49:56.376 18227 18227 W Magisk : su: request rejected (10318->0)
12-14 08:49:59.606 18453 18453 W Magisk : su: request rejected (10318->0)
12-14 08:50:42.816 20522 20522 W Magisk : su: request rejected (10268->0)
12-14 08:51:43.016 21433 21433 W Magisk : su: request rejected (10268->0)
12-14 08:52:08.486 21745 21745 E Magisk : write failed with 32: Broken pipe
12-14 08:52:08.496 21745 21745 E Magisk : readlink /proc/20888/cwd failed with 2: No such file or directory
12-14 08:52:08.496 21745 21745 E Magisk : read failed with 9: Bad file number
12-14 08:52:08.496 21745 21745 E Magisk : read failed with 9: Bad file number
12-14 08:52:08.496 21745 21745 E Magisk : read failed with 14: Bad address
12-14 08:52:08.496 21745 21745 E Magisk : read failed with 14: Bad address
12-14 08:52:08.496 21745 21745 E Magisk : stat icu failed with 2: No such file or directory
12-14 08:52:08.496 21745 21745 E Magisk : su: Wrong permission of pts_slave
12-14 08:52:43.336 22139 22139 W Magisk : su: request rejected (10268->0)
12-14 08:53:28.726 22680 22680 E Magisk : write failed with 32: Broken pipe
12-14 08:53:28.726 22680 22680 E Magisk : readlink /proc/21993/cwd failed with 2: No such file or directory
12-14 08:53:28.726 22680 22680 E Magisk : read failed with 9: Bad file number
12-14 08:53:28.726 22680 22680 E Magisk : read failed with 9: Bad file number
12-14 08:53:28.726 22680 22680 E Magisk : read failed with 14: Bad address
12-14 08:53:28.726 22680 22680 E Magisk : read failed with 14: Bad address
12-14 08:53:28.726 22680 22680 E Magisk : dup2 failed with 9: Bad file number
12-14 08:53:28.726 22680 22680 E Magisk : dup2 failed with 9: Bad file number
12-14 08:53:28.726 22680 22680 E Magisk : dup2 failed with 9: Bad file number
12-14 08:53:28.736 22680 22680 W Magisk : su: request rejected (10189->0)
12-14 08:53:28.736 22679 22679 W Magisk : su: request rejected (10189->0)
12-14 08:53:43.866 22828 22828 W Magisk : su: request rejected (10268->0)
12-14 08:53:51.836 22949 22949 W Magisk : su: request rejected (10189->0)
12-14 08:54:44.106 23359 23359 W Magisk : su: request rejected (10268->0)
12-14 08:55:59.326 23989 23989 W Magisk : su: request rejected (10189->0)

Lots of errors in the log so I'm sure something is wrong. Anyone kind enough to give it a go? As it is now, my phone is in a semi usable state.

Thanks.