[FS#4158] Master regression - boot loop due to kernel panic (mt7621)

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FS#4158 - Master regression - boot loop due to kernel panic (mt7621)
User who did this - d.souza (dsouza)

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Just posting here what I just posted in the forum.

I think I've spoken too soon that removing the patch fixed the problem. In a rush last night to test it, I just removed the patch and rebooted the router. And it rebooted OK, without boot loop, and I concluded it was OK.

But today after a closer inspection in the log file I've noticed that the RAM size is being incorrectly detected, 256MB instead of 128MB (see below).

I will try now going back to my previous fix by setting "CONFIG_HIGHMEM=n" to check if it has a different outcome.


[    0.000000] Linux version 5.4.162 (dsouza at dsouza00) (gcc version 11.2.0 (OpenWrt GCC 11.2.0 r18233-0a4f5d06c2)) #0 SMP Sun Nov 28 20:15:10 2021
[    0.000000] SoC Type: MediaTek MT7621 ver:1 eco:3
[    0.000000] printk: bootconsole [early0] enabled
[    0.000000] CPU0 revision is: 0001992f (MIPS 1004Kc)
[    0.000000] MIPS: machine is TP-Link Archer C6 v3
[    0.000000] Initrd not found or empty - disabling initrd
[    0.000000] VPE topology {2,2} total 4
[    0.000000] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[    0.000000] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[    0.000000] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[    0.000000] Zone ranges:
[    0.000000]   Normal   [mem 0x0000000000000000-0x000000000fffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x000000001bffffff]
[    0.000000]   node   0: [mem 0x0000000020000000-0x0000000023ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000023ffffff]
[    0.000000] On node 0 totalpages: 65536
[    0.000000]   Normal zone: 576 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 65536 pages, LIFO batch:15
[    0.000000] percpu: Embedded 14 pages/cpu s26480 r8192 d22672 u57344
[    0.000000] pcpu-alloc: s26480 r8192 d22672 u57344 alloc=14*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3 
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 64960
[    0.000000] Kernel command line: console=ttyS0,115200n8 rootfstype=squashfs,jffs2
[    0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072 bytes, linear)
[    0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 bytes, linear)
[    0.000000] Writing ErrCtl register=0005a010
[    0.000000] Readback ErrCtl register=0005a010
[    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[    0.000000] Memory: 250320K/262144K available (6107K kernel code, 201K rwdata, 1240K rodata, 1272K init, 206K bss, 11824K reserved, 0K cma-reserved)

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4158#comment10362

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