[OpenWrt-Devel] [PATCH] ramips: mt7621: limit dictionary size for DIR-860L due to kernel 5.4

Szabolcs Hubai szab.hu at gmail.com
Thu Apr 16 11:31:46 EDT 2020 

Snapshot images for DIR-860L after the initial kernel 5.4 landing
(on Apr 4, 2020 commits from b51ea43f9001 to 4d979a4d1969)
are broken: they causes "LZMA ERROR 1 - must RESET board to recover"

Snapshot factory image serial log:
----
Please choose the operation:
   1: Load system code to SDRAM via TFTP.
   2: Load system code then write to Flash via TFTP.
   3: Boot system code via Flash (default).
   4: Entr boot command line interface.
   7: Load Boot Loader code then write to Flash via Serial.
   9: Load Boot Loader code then write to Flash via TFTP.

You choosed 3

0

3: System Boot system code via Flash.
addr:80500000
We have SEAMA, Image Size = 2424768
Verifying Checksum ...
Uncompressing SEAMA linux.lzma ... LZMA ERROR 1 - must RESET board to recover
----

The local defconfig build works, also the snapshot initramfs images.

The bug can be reproduced with the "CONFIG_ALL_KMODS=y" configuration.

As this "LZMA ERROR 1" isn't new (e.g. 77e2bccde8f7),
I tried to adjust the lzma dictionary parameter:
- with "-d20" and above it causes "LZMA ERROR 1"
- with "-d19" it boots but doesn't find the device tree (see below)
- with "-d18" it boots fine

Serial log with "-d19" lzma dictionary:
----
Please choose the operation:
   1: Load system code to SDRAM via TFTP.
   2: Load system code then write to Flash via TFTP.
   3: Boot system code via Flash (default).
   4: Entr boot command line interface.
   7: Load Boot Loader code then write to Flash via Serial.
   9: Load Boot Loader code then write to Flash via TFTP.
0

3: System Boot system code via Flash.
addr:80500000
We have SEAMA, Image Size = 4915140
Verifying Checksum ...
Uncompressing SEAMA linux.lzma ... OK

Starting kernel ...

[    0.000000] Linux version 5.4.32 (xabolcs at ut1804) (gcc version 8.4.0 (OpenWrt GCC 8.4.0 r12974-75f19deb3a)) #0 SMP Wed Apr 15 02:14:19 2020
[    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] 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 0x0000000000000000-0x0000000007ffffff]
[    0.000000]   HighMem  empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] OF: fdt: No valid device tree found, continuing without
[    0.000000] percpu: Embedded 14 pages/cpu s26704 r8192 d22448 u57344
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 32480
[    0.000000] Kernel command line:   rootfstype=squashfs,jffs2
[    0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes, linear)
[    0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes, linear)
[    0.000000] Writing ErrCtl register=0004050c
[    0.000000] Readback ErrCtl register=0004050c
[    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[    0.000000] Memory: 120752K/131072K available (5826K kernel code, 206K rwdata, 1252K rodata, 1280K init, 237K bss, 10320K reserved, 0K cma-reserved, 0K highmem)
[    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[    0.000000] rcu: Hierarchical RCU implementation.
[    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies.
[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: CPU: 0 PID: 0 at kernel/rcu/tree.c:2998 rcu_init+0x55c/0x774
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.32 #0
[    0.000000] Stack : 00000000 800774cc 806b0000 806b6474 80720000 806b643c 806b5590 806efdb4
[    0.000000]         80860000 80701248 80700d83 8064c7e4 00000000 00000001 806efd58 00000000
[    0.000000]         00000000 00000000 808a0000 00000000 00000030 00000027 342e3520 2032332e
[    0.000000]         00000000 00000000 00000000 00000000 00000000 80720000 00000000 807299f0
[    0.000000]         00000009 806451a4 806fe2b0 80700000 00000002 00000010 87ff0000 00000000
[    0.000000]         ...
[    0.000000] Call Trace:
[    0.000000] [<8000b72c>] show_stack+0x30/0x100
[    0.000000] [<8058fac4>] dump_stack+0xa4/0xdc
[    0.000000] [<80028038>] __warn+0xc0/0x10c
[    0.000000] [<800280e0>] warn_slowpath_fmt+0x5c/0xac
[    0.000000] [<807299f0>] rcu_init+0x55c/0x774
[    0.000000] [<80720a7c>] start_kernel+0x2dc/0x55c
[    0.000000] [<80011044>] start_secondary+0xb0/0x3a0
[    0.000000] random: get_random_bytes called from print_oops_end_marker+0x2c/0x64 with crng_init=0
[    0.000000] ---[ end trace 0000000000000000 ]---
[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: CPU: 0 PID: 0 at kernel/rcu/tree.c:2999 rcu_init+0x5ac/0x774
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        W          5.4.32 #0
[    0.000000] Stack : 00000000 800774cc 806b0000 806b6474 80720000 806b643c 806b5590 806efdb4
[    0.000000]         80860000 80701248 80700d83 8064c7e4 00000000 00000001 806efd58 00000000
[    0.000000]         00000000 00000000 808a0000 00000000 00000030 0000003b 342e3520 2032332e
[    0.000000]         00000000 00000000 00000000 00000000 00000000 80720000 00000000 80729a40
[    0.000000]         00000009 806451a4 806fe2b0 80700000 00000002 00000010 87ff0000 00000000
[    0.000000]         ...
[    0.000000] Call Trace:
[    0.000000] [<8000b72c>] show_stack+0x30/0x100
[    0.000000] [<8058fac4>] dump_stack+0xa4/0xdc
[    0.000000] [<80028038>] __warn+0xc0/0x10c
[    0.000000] [<800280e0>] warn_slowpath_fmt+0x5c/0xac
[    0.000000] [<80729a40>] rcu_init+0x5ac/0x774
[    0.000000] [<80720a7c>] start_kernel+0x2dc/0x55c
[    0.000000] [<80011044>] start_secondary+0xb0/0x3a0
[    0.000000] ---[ end trace f68728a0d3053b52 ]---
[    0.000000] NR_IRQS: 256
[    0.000000] Kernel panic - not syncing: Failed to find mtk,mt7621-sysc node
[    0.000000] Rebooting in 1 seconds..
[    0.000000] Reboot failed -- System halted
----

Signed-off-by: Szabolcs Hubai <szab.hu at gmail.com>
---
 target/linux/ramips/image/mt7621.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index 6e64fb8bf1..cfae103d22 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -218,6 +218,7 @@ define Device/dlink_dir-860l-b1
   $(Device/seama)
   BLOCKSIZE := 64k
   SEAMA_SIGNATURE := wrgac13_dlink.2013gui_dir860lb
+  KERNEL := kernel-bin | append-dtb | relocate-kernel | lzma -d18 | uImage lzma
   KERNEL := kernel-bin | append-dtb | relocate-kernel | lzma | uImage lzma
   IMAGE_SIZE := 16064k
   DEVICE_VENDOR := D-Link
-- 
2.17.1


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