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I'm trying to load an out-of-tree module, exactly the same way I was doing it on past kernels with success. But with 5.15.27, it longer works:

$ insmod /lib/modules/5.15.27custom/extra/mymodule.ko

insmod: ERROR: could not insert module /lib/modules/5.15.27custom/extra/mymodule.ko: Invalid parameters

dmesg says:

[61204.361302] mymodule: disagrees about version of symbol __stack_chk_fail

[61204.361326] mymodule: Unknown symbol __stack_chk_fail (err -22)

CONFIG_STACKPROTECTOR and CONFIG_STACKPROTECTOR_STRONG are set in .config, if that matters.

Can anyone help me on how to make that module loadable (or rebuild so it can be loaded)?

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  • Silly question, but you have recompiled it against the running kernel source?
    – Bib
    Jun 21 at 15:02
  • No, the running version is 4.15.0-187-generic (Ubuntu 18.04, which I'need for compiling for a very scruffy embedded OS). But that was never an issue.
    – Fabiano
    Jun 21 at 17:02
  • Then you have a problem. You are saying the running kernel version is 4.15.0-187-generic, and yet, the above error shows 5.15.27custom. If you have compiled it again that v5 kernel, then there is no chance of loading it in the running v4.
    – Bib
    Jun 21 at 17:39
  • No, I'm trying it to load into a 5.15.27custom system, but building on a 4.15.0-... system! ;)
    – Fabiano
    Jun 21 at 21:50

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