On Wed, Jul 5, 2023 at 10:16 AM David Hildenbrand <david@xxxxxxxxxx> wrote: > > On 05.07.23 19:12, Suren Baghdasaryan wrote: > > A memory corruption was reported in [1] with bisection pointing to the > > patch [2] enabling per-VMA locks for x86. > > Disable per-VMA locks config to prevent this issue while the problem is > > being investigated. This is expected to be a temporary measure. > > > > [1] https://bugzilla.kernel.org/show_bug.cgi?id=217624 > > [2] https://lore.kernel.org/all/20230227173632.3292573-30-surenb@xxxxxxxxxx > > > > Reported-by: Jiri Slaby <jirislaby@xxxxxxxxxx> > > Closes: https://lore.kernel.org/all/dbdef34c-3a07-5951-e1ae-e9c6e3cdf51b@xxxxxxxxxx/ > > Reported-by: Jacob Young <jacobly.alt@xxxxxxxxx> > > Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217624 > > Fixes: 0bff0aaea03e ("x86/mm: try VMA lock-based page fault handling first") > > Cc: stable@xxxxxxxxxxxxxxx > > Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx> > > --- > > mm/Kconfig | 3 ++- > > 1 file changed, 2 insertions(+), 1 deletion(-) > > > > diff --git a/mm/Kconfig b/mm/Kconfig > > index 09130434e30d..0abc6c71dd89 100644 > > --- a/mm/Kconfig > > +++ b/mm/Kconfig > > @@ -1224,8 +1224,9 @@ config ARCH_SUPPORTS_PER_VMA_LOCK > > def_bool n > > > > config PER_VMA_LOCK > > - def_bool y > > + bool "Enable per-vma locking during page fault handling." > > depends on ARCH_SUPPORTS_PER_VMA_LOCK && MMU && SMP > > + depends on BROKEN > > help > > Allow per-vma locking during page fault handling. > > > Do we have any testing results (that don't reveal other issues :) ) for > patch #1? Not sure if we really want to mark it broken if patch #1 fixes > the issue. I tested the fix using the only reproducer provided in the reports plus kernel compilation and my fork stress test. All looked good and stable but I don't know if other reports had the same issue or something different. I think the urgency to disable the feature stems from the timeline being very close to when distributions will start using the 6.4 stable kernel version. > > -- > Cheers, > > David / dhildenb >
