On Sat, 16 Jul 2022 at 20:43, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote: [...] > > - 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?
