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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? Commented Jun 21, 2022 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. Commented Jun 21, 2022 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. Commented Jun 21, 2022 at 17:39
  • No, I'm trying it to load into a 5.15.27custom system, but building on a 4.15.0-... system! ;) Commented Jun 21, 2022 at 21:50

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