On 02/28, Masami Hiramatsu wrote: >On Mon, 27 Feb 2017 16:01:34 +0300 >Andrey Ryabinin <aryabi...@virtuozzo.com> wrote: > >> On 02/27/2017 04:03 AM, kernel test robot wrote: >> > >> > FYI, we noticed the following commit: >> > >> > commit: 243b72aae28ca1032284028323bb81c9235b15c9 ("x86/mm/ptdump: Optimize >> > check for W+X mappings for CONFIG_KASAN=y") >> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master >> >> ... >> > >> > caused below changes (please refer to attached dmesg/kmsg for entire >> > log/backtrace): >> > >> > >> > +-----------------------------------------------------+------------+------------+ >> > | | 5b1ad68f9b | >> > 243b72aae2 | >> > +-----------------------------------------------------+------------+------------+ >> > | boot_successes | 0 | 0 >> > | >> > | boot_failures | 8 | 6 >> > | >> > | BUG:KASAN:slab-out-of-bounds | 8 | 6 >> > | >> > | WARNING:at_arch/x86/mm/dump_pagetables.c:#note_page | 0 | 6 >> > | >> > +-----------------------------------------------------+------------+------------+ >> >> Ok, I reproduced this, but it's definitely caused *not* by 243b72aae28. >> This WARN is also reproducible on the parent commit 5b1ad68f9b. >> The only difference here is that on parent one needs dozens of seconds to >> reach this WARNING. >> It seems that this time difference somehow confused the robot. >> >> As for the warning itself, it caused by kprobes. krpobe code use >> module_alloc() which >> creates these RWX mappings. >> I'm not sure how to fix this as AFAIK kprobes actually need RWX mapping. > >Thanks! I also noticed this issue. I actually have a plan to make kprobes with >R+X mappings (as ftrace does). >I'll queue this on my TODO list. >
Good to know that, feel free to ask me to verify your fix if needed. Thanks, Xiaolong > > >-- >Masami Hiramatsu <mhira...@kernel.org>