Subject: [Bug 205099] KASAN hit at raid6_pq: BUG: Unable to handle kernel data access at 0x00f0fd0d

From: [email-masked]
Date: Fri, 26 Nov 2021 09:14:06 +0000

https://bugzilla.kernel.org/show_bug.cgi?id=205099

--- Comment #38 from Christophe Leroy ([email-masked]) ---
Looks like only x86 are arm implement this vmalloc= parameter:

[chleroy@PO20335 linux-powerpc]$ git grep 'early_param("vmalloc"' arch/
arch/arm/mm/mmu.c:early_param("vmalloc", early_vmalloc);
arch/x86/mm/pgtable_32.c:early_param("vmalloc", parse_vmalloc);

However, your vmalloc area has a size of 65M:

Kernel virtual memory layout:
  * 0xf6000000..0xfec00000  : kasan shadow mem
  * 0xf5bbf000..0xf5fff000  : fixmap
  * 0xf5400000..0xf5800000  : highmem PTEs
  * 0xf5115000..0xf5400000  : early ioremap
  * 0xf1000000..0xf5110000  : vmalloc & ioremap
  * 0xb0000000..0xc0000000  : modules
Memory: 1928984K/2097152K available (22288K kernel code, 2616K rwdata, 4868K
rodata, 1408K init, 8981K bss, 168168K reserved, 0K cma-reserved, 1310720K
highmem)

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