Re: [PATCH v2 1/1] mm: kfence: apply kmemleak_ignore_phys on early allocated pool
From: Marco Elver <elver@google.com>
Date: 2022-07-18 14:27:06
Also in:
linux-mediatek, linux-mm, lkml
On Sat, 16 Jul 2022 at 20:43, Geert Uytterhoeven [off-list ref] wrote: [...]
quoted
- This patch has been accused of crashing the kernel: https://lkml.kernel.org/r/YsFeUHkrFTQ7T51Q@xsang-OptiPlex-9020 Do we think that report is bogus?I think all of this is highly architecture-specific...
The report can be reproduced on i386 with CONFIG_X86_PAE=y. But e.g. mm/memblock.c:memblock_free() is also guilty of using __pa() on previously memblock_alloc()'d addresses. Looking at the phys addr before memblock_alloc() does virt_to_phys(), the result of __pa() looks correct even on PAE, at least for the purpose of passing it on to kmemleak(). So I don't know what that BUG_ON(slow_virt_to_phys() != phys_addr) is supposed to tell us here. Ideas? _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel