[Google Pixel 2 XL Guides, News, & Discussion] rockingondrums:
That's what I did to successfully install several months ago, but doing that with v5.5.5 on Jan build gets me stuck on the white G. I reflash the stock boot image, the same one I pushed to patch (from factory image), and I boot right back up.

Turns out I saved the log from my last failed install:

- Device platform: arm64

- Extracting files

- Use boot image: /data/user_de/0/com.topjohnwu.magisk/install/boot.img

grep: /etc/*fstab*: No such file or directory

- Mounting /system, /vendor

- Device skip_initramfs detected

- Unpacking boot image

MagiskBoot v15.3(1531) (by topjohnwu) - Boot Image Modification Tool

Parsing boot image: [/data/user_de/0/com.topjohnwu.magisk/install/boot.img]

KERNEL [16931085] @ 0x00008000

RAMDISK [9171745] @ 0x01000000

SECOND [0] @ 0x00f00000

EXTRA [0] @ 0x00000100

PAGESIZE [4096]

OS_VERSION [8.1.0]

PATCH_LEVEL [2018-01]

NAME []

CMDLINE [console=ttyMSM0,115200,n8 earlycon=msm_serial_dm,0xc1b0000 androidboot.hardware=taimen androidboot.console=ttyMSM0 lpm_levels.sleep_disabled=1 user_debug=31 msm_rtb.filter=0x37 ehci-hcd.park=3 service_locator.enable=1 swiotlb=2048 firmware_class.path=/vendor/firmware loop.max_part=7 raid=noautodetect buildvariant=user]

DTB [391844]

KERNEL_FMT [lz4]

RAMDISK_FMT [gzip]

- Checking ramdisk status

MagiskBoot v15.3(1531) (by topjohnwu) - Boot Image Modification Tool

Loading cpio: [ramdisk.cpio]

- Stock boot image detected

- Backing up stock boot image

MagiskBoot v15.3(1531) (by topjohnwu) - Boot Image Modification Tool

Compressing to [stock_boot_cb345ec200b2cf05f7738a3579a500b49c3212af.img.gz]

- Patching ramdisk

MagiskBoot v15.3(1531) (by topjohnwu) - Boot Image Modification Tool

Loading cpio: [ramdisk.cpio]

Add entry [init] (0750)

Patch with flag KEEPVERITY=[false] KEEPFORCEENCRYPT=[true]

Remove pattern [,avb]

Save SHA1: [cb345ec200b2cf05f7738a3579a500b49c3212af] -> [.backup/.sha1]

Loading cpio: [ramdisk.cpio.orig]

Backup mismatch entry: [etc/recovery.fstab] -> [.backup/etc/recovery.fstab]

Backup mismatch entry: [init] -> [.backup/init]

Dump cpio: [ramdisk.cpio]

MagiskBoot v15.3(1531) (by topjohnwu) - Boot Image Modification Tool

Loading dtbs from [dtb]

MagiskBoot v15.3(1531) (by topjohnwu) - Boot Image Modification Tool

MagiskBoot v15.3(1531) (by topjohnwu) - Boot Image Modification Tool

Patch @ 01B7A86E [736B69705F696E697472616D6673]->[77616E745F696E697472616D6673]

- Repacking boot image

MagiskBoot v15.3(1531) (by topjohnwu) - Boot Image Modification Tool

Parsing boot image: [/data/user_de/0/com.topjohnwu.magisk/install/boot.img]

KERNEL [16931085] @ 0x00008000

RAMDISK [9171745] @ 0x01000000

SECOND [0] @ 0x00f00000

EXTRA [0] @ 0x00000100

PAGESIZE [4096]

OS_VERSION [8.1.0]

PATCH_LEVEL [2018-01]

NAME []

CMDLINE [console=ttyMSM0,115200,n8 earlycon=msm_serial_dm,0xc1b0000 androidboot.hardware=taimen androidboot.console=ttyMSM0 lpm_levels.sleep_disabled=1 user_debug=31 msm_rtb.filter=0x37 ehci-hcd.park=3 service_locator.enable=1 swiotlb=2048 firmware_class.path=/vendor/firmware loop.max_part=7 raid=noautodetect buildvariant=user]

DTB [391844]

KERNEL_FMT [lz4]

RAMDISK_FMT [gzip]

Repack to boot image: [new-boot.img]

KERNEL [16931085] @ 0x00008000

RAMDISK [9547533] @ 0x01000000

SECOND [0] @ 0x00f00000

EXTRA [0] @ 0x00000100

PAGESIZE [4096]

OS_VERSION [8.1.0]

PATCH_LEVEL [2018-01]

NAME []

CMDLINE [console=ttyMSM0,115200,n8 earlycon=msm_serial_dm,0xc1b0000 androidboot.hardware=taimen androidboot.console=ttyMSM0 lpm_levels.sleep_disabled=1 user_debug=31 msm_rtb.filter=0x37 ehci-hcd.park=3 service_locator.enable=1 swiotlb=2048 firmware_class.path=/vendor/firmware loop.max_part=7 raid=noautodetect buildvariant=user]

MagiskBoot v15.3(1531) (by topjohnwu) - Boot Image Modification Tool

Cleaning up...

*********************************

Patched Boot Image is placed in

/storage/emulated/0/MagiskManager/patched_boot.img

*********************************

- All done!