[FS#3890] Kernel is wrongly encapsulated

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - anonymous (Mijzelf) 

Attached to Project - OpenWrt/LEDE Project
Summary - Kernel is wrongly encapsulated
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - Device ZyXEL P2812HNU-F1

Flashing the sysupgrade of 21.02rc3 bricks the router. Apparently there is a checksum error in the flashed kernel:

NAND read: device 0 offset 0x60000, size 0x200000
2097152 bytes read: OK

## Booting kernel from Legacy Image at 80800000 ...
   Image Name:   MIPS OpenWrt Linux-5.4.124
   Created:      2021-06-13  22:02:19 UTC
   Image Type:   MIPS Linux Kernel Image (lzma compressed)
   Data Size:    2465658 Bytes = 2.4 MiB
   Load Address: 80002000
   Entry Point:  80002000
   Verifying Checksum ... Bad Data CRC
ERROR: can't get kernel image! 

Further, don't know if it is related, booting the initramfs-kernel.bin doesn't work either:

P-2812HNU-F1 # bootm $fileaddr
## Booting kernel from Legacy Image at 81000000 ...
   Image Name:   MIPS OpenWrt Linux-5.4.124
   Created:      2021-06-13  22:02:19 UTC
   Image Type:   MIPS Linux Kernel Image (lzma compressed)
   Data Size:    5608365 Bytes = 5.3 MiB
   Load Address: 80002000
   Entry Point:  80002000
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... LZMA: uncompress or overwrite error 7 - must RESET b


When tftpbooting the kernel found in the imagebuilder, 
openwrt-imagebuilder-21.02.0-rc3-lantiq-xrx200.Linux-x86_64/build_dir/target-mips_24kc_musl/linux-lantiq_xrx200/zyxel_p-2812hnu-f1-kernel.bin
the kernel boots fine (and uses the rootfs which is currently flashed in ubi), and has the same size and timestamp as the one from sysupgrade:

bootm $fileaddr
## Booting kernel from Legacy Image at 81000000 ...
   Image Name:   MIPS OpenWrt Linux-5.4.124
   Created:      2021-06-13  22:02:19 UTC
   Image Type:   MIPS Linux Kernel Image (lzma compressed)
   Data Size:    2465658 Bytes = 2.4 MiB
   Load Address: 80002000
   Entry Point:  80002000
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... OK

Starting kernel ...

So my guess is something went wrong in assembling the sysupgrade image, destroying the CRC.

I also tried the initramfs-kernel from the bt-homehub and the initramfs-kernel of snapshot for the p-2812hnu-f1, which both gave the same lzma decompress error.


More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3890

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