On Mon, Oct 21, 2024 at 3:03 PM Linus Walleij <linus.walleij@xxxxxxxxxx> wrote: > This problem reported by Clement LE GOFFIC manifest when > using CONFIG_KASAN_IN_VMALLOC and VMAP_STACK: > https://lore.kernel.org/linux-arm-kernel/a1a1d062-f3a2-4d05-9836-3b098de9db6d@xxxxxxxxxxx/ > > After some analysis it seems we are missing to sync the > VMALLOC shadow memory in top level PGD to all CPUs. > > Add some code to perform this sync, and the bug appears > to go away. > > As suggested by Ard, also perform a dummy read from the > shadow memory of the new VMAP_STACK in the low level > assembly. > > Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx> As these are regressions that need to go in as fixes I'm putting them into Russell's patch tracker now. The 9427/1 patch: https://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=9427/1 Need to be avoided as it causes build regressions. Patch 1/3 supersedes it. Yours, Linus Walleij
