[PATCH 0/3] mm/hugetlb: Fix missing hugetlb_lock for memcg resv uncharge

[Peter Xu]

Should fix the recent syzbot report for:

https://lore.kernel.org/all/000000000000ee06de0616177560@xxxxxxxxxx/

Patch 1 is a small fixup where I notice mm-unstable crashes with the new
hugetlb memcg accounting when testing the changes.

Patch 2 should be the fix to the reported issue.

Patch 3 is an oneliner to add an assertion similar to what found the issue
in patch 2.

Only smoke tested over a bunch of hugetlb unit tests.  Reviews welcomed.

Thanks,

Peter Xu (3):
  fixup! mm: always initialise folio->_deferred_list
  mm/hugetlb: Fix missing hugetlb_lock for resv uncharge
  mm/hugetlb: Assert hugetlb_lock in __hugetlb_cgroup_commit_charge

 mm/hugetlb.c        | 5 ++++-
 mm/hugetlb_cgroup.c | 2 +-
 mm/memcontrol.c     | 1 +
 3 files changed, 6 insertions(+), 2 deletions(-)

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2.44.0