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A kernel panic was reported with the following kernel log:
EDAC igen6: Expected 2 mcs, but only 1 detected.
BUG: unable to handle page fault for address: 000000000000d570
...
Hardware name: Notebook V54x_6x_TU/V54x_6x_TU, BIOS Dasharo (coreboot+UEFI) v0.9.0 07/17/2024
RIP: e030:ecclog_handler+0x7e/0xf0 [igen6_edac]
...
igen6_probe+0x2a0/0x343 [igen6_edac]
...
igen6_init+0xc5/0xff0 [igen6_edac]
...
This issue occurred because one memory controller was disabled by
the BIOS but the igen6_edac driver still checked all the memory
controllers, including this absent one, to identify the source of
the error. Accessing the null MMIO for the absent memory controller
resulted in the oops above.
Fix this issue by reverting the configuration structure to non-const
and updating the field 'res_cfg->num_imc' to reflect the number of
detected memory controllers.
Fixes: 20e190b1c1 ("EDAC/igen6: Skip absent memory controllers")
Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Closes: https://lore.kernel.org/all/aFFN7RlXkaK_loQb@mail-itl/
Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Link: https://lore.kernel.org/r/20250618162307.1523736-1-qiuxu.zhuo@intel.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.