https://bugzilla.kernel.org/show_bug.cgi?id=204479
--- Comment #11 from Christophe Leroy (christophe.le...@c-s.fr) --- Thanks. Then it is not about SMP allthough there's anyway a theoritical problem with SMP that's I'll address in another patch. I think I finally spotted the issue. Let's take the first occurence of the first log: Aug 08 23:39:58 T600 kernel: ###### module_alloc(4718) = f1065000 [fe20ca00-fe20d2e3] [...] Aug 08 23:39:59 T600 kernel: BUG: Unable to handle kernel data access at 0xfe20d040 In kasan_init_region(), the loop starts with k_cur = 0xfe20ca00 to set the pte for the first shadow page at 0xfe20c000. Then k_cur is increased by PAGE_SIZE so now k_cur = 0xfe20da00. As this is over 0xfe20d2e3, it doesn't set the pte for the second page at 0xfe20d000. It should be fixed by changing the init value of k_cur in the for() loop of kasan_init_region() by: for (k_cur = k_start & PAGE_MASK; ....) Can you test it ? -- You are receiving this mail because: You are on the CC list for the bug.
