OpenWrt's out-of-tree 204-module_strip.patch causes issues

[Daniel Golle]

On 1 June 2024 20:23:20 UTC, "Arınç ÜNAL" <arinc.unal at arinc9.com> wrote:
>I've been working on porting MP-DCCP to Teltonika SDK 7.6.10. The SDK is
>based off of OpenWrt, close to 22.03.6. After spending hours on figuring
>out why my MP-DCCP port works on the vanilla 5.10.201 but not OpenWrt's
>5.10.201, I've started looking for OpenWrt's out-of-tree kernel patches. I
>was able to pinpoint it to
>target/linux/generic/hack-5.10/204-module_strip.patch. I see that this
>patch is still there for 6.6 on the main branch of the OpenWrt repository.

I guess that's the price to pay for space reduction.... And I guess the fact that Teltonika bases their OS on OpenWrt is also because they manage to implement a dual-boot system with 16MB of flash, so there is some direct causal connection here, SPI-NOR still being much more reliable and cheaper than an eMMC which could fit Debian or whatever other OS...

Anyway, does that warning also occur if CONFIG_MODULE_STRIPPED isn't selected? And is there any functional impact besides that warning?


>
>For my case, I just removed this patch and moved on. I'm only sending this
>email as proof that OpenWrt's out-of-tree patches cause issues.
>
>[    1.897757] ------------[ cut here ]------------
>[    1.902441] WARNING: CPU: 0 PID: 1 at fs/sysfs/group.c:116 internal_create_group+0x3ac/0x3d4
>[    1.911179] Modules linked in:
>[    1.914253] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.10.201 #0
>[    1.920346] Hardware name: Mediatek Cortex-A7 (Device Tree)
>[    1.925936] [<c010d780>] (unwind_backtrace) from [<c0109c00>] (show_stack+0x10/0x14)
>[    1.933688] [<c0109c00>] (show_stack) from [<c04c21f8>] (dump_stack+0x88/0x9c)
>[    1.940917] [<c04c21f8>] (dump_stack) from [<c011ead8>] (__warn+0x9c/0xf8)
>[    1.947796] [<c011ead8>] (__warn) from [<c011eb9c>] (warn_slowpath_fmt+0x68/0x78)
>[    1.955287] [<c011eb9c>] (warn_slowpath_fmt) from [<c02f0300>] (internal_create_group+0x3ac/0x3d4)
>[    1.964258] [<c02f0300>] (internal_create_group) from [<c08efb98>] (mpdccp_link_sysfs_init+0x90/0xb4)
>[    1.973489] [<c08efb98>] (mpdccp_link_sysfs_init) from [<c0d2786c>] (mpdccp_link_module_init+0x24/0xdc)
>[    1.982889] [<c0d2786c>] (mpdccp_link_module_init) from [<c0101920>] (do_one_initcall+0x54/0x1f4)
>[    1.991769] [<c0101920>] (do_one_initcall) from [<c0d0125c>] (kernel_init_freeable+0x22c/0x280)
>[    2.000474] [<c0d0125c>] (kernel_init_freeable) from [<c0900454>] (kernel_init+0x8/0x118)
>[    2.008657] [<c0900454>] (kernel_init) from [<c0100148>] (ret_from_fork+0x14/0x2c)
>[    2.016229] Exception stack(0xc1079fb0 to 0xc1079ff8)
>[    2.021282] 9fa0:                                     00000000 00000000 00000000 00000000
>[    2.029465] 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
>[    2.037645] 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
>[    2.044348] ---[ end trace a1a1b229e3c1a883 ]---
>
>Arınç
>
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