Matthew Wilcox (Oracle)
3b7f3cab1d
mm/filemap: fix storing to a THP shadow entry ...
commit 198b62f83eef1d605d70eca32759c92cdcc14175 upstream
When a THP is removed from the page cache by reclaim, we replace it with a
shadow entry that occupies all slots of the XArray previously occupied by
the THP. If the user then accesses that page again, we only allocate a
single page, but storing it into the shadow entry replaces all entries
with that one page. That leads to bugs like
page dumped because: VM_BUG_ON_PAGE(page_to_pgoff(page) != offset)
------------[ cut here ]------------
kernel BUG at mm/filemap.c:2529!
https://bugzilla.kernel.org/show_bug.cgi?id=206569
This is hard to reproduce with mainline, but happens regularly with the
THP patchset (as so many more THPs are created). This solution is take
from the THP patchset. It splits the shadow entry into order-0 pieces at
the time that we bring a new page into cache.
Fixes: 99cb0dbd47https://lkml.kernel.org/r/20200903183029.14930-4-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-06-10 13:37:15 +02:00
kasan: fix incorrect arguments passing in kasan_add_zero_shadow
2021-01-27 11:47:53 +01:00
bdi: add a ->dev_name field to struct backing_dev_info
2020-05-14 07:58:30 +02:00
cma: don't quit at first error when activating reserved areas
2020-09-03 11:26:51 +02:00
mm/compaction: fix misbehaviors of fast_find_migrateblock()
2021-03-04 10:26:39 +01:00
mm/debug.c: always print flags in dump_page()
2020-03-05 16:43:51 +01:00
mm/filemap: fix storing to a THP shadow entry
2021-06-10 13:37:15 +02:00
mm/gup: fix gup_fast with dynamic page table folding
2020-10-01 13:18:24 +02:00
mm/gup: fix memory leak in __gup_benchmark_ioctl
2020-01-09 10:20:00 +01:00
mm: thp: fix MADV_REMOVE deadlock on shmem THP
2021-02-10 09:25:31 +01:00
mm, hugetlb: fix simple resv_huge_pages underflow on UFFDIO_COPY
2021-06-10 13:37:14 +02:00
mm: hugetlb: switch to css_tryget() in hugetlb_cgroup_charge_cgroup()
2019-11-15 18:34:00 -08:00
mm/init-mm.c: include <linux/mman.h> for vm_committed_as_batch
2019-10-19 06:32:32 -04:00
mm: drop mmap_sem before calling balance_dirty_pages() in write fault
2020-01-09 10:19:55 +01:00
mm/zsmalloc.c: drop ZSMALLOC_PGTABLE_MAPPING
2020-12-16 10:56:59 +01:00
khugepaged: fix wrong result value for trace_mm_collapse_huge_page_isolate()
2021-05-19 10:08:27 +02:00
mm/kmemleak.c: use address-of operator on section symbols
2020-10-01 13:17:53 +02:00
ksm: fix potential missing rmap_item for stable_node
2021-05-19 10:08:27 +02:00
mm: list_lru: set shrinker map bit when child nr_items is not zero
2020-12-11 13:23:31 +01:00
uaccess: Add non-pagefault user-space write function
2020-01-17 19:48:40 +01:00
mm: validate pmd after splitting
2020-10-01 13:18:21 +02:00
memblock: do not start bottom-up allocations with kernel_end
2021-02-10 09:25:28 +01:00
mm: memcg/slab: fix root memcg vmstats
2020-11-24 13:29:24 +01:00
mm/memory-failure: unnecessary amount of unmapping
2021-05-14 09:44:32 +02:00
mm: fix race by making init_zero_pfn() early_initcall
2021-04-07 14:47:42 +02:00
mm: don't rely on system state to detect hot-plug operations
2020-10-07 08:01:30 +02:00
mm: mempolicy: fix potential pte_unmap_unlock pte error
2020-11-10 12:37:27 +01:00
mm/memory_hotplug: shrink zones when offlining memory
2020-01-09 10:19:56 +01:00
mm/migrate.c: fix potential indeterminate pte entry in migrate_vma_insert_page()
2021-05-19 10:08:27 +02:00
mm/mmap.c: initialize align_offset explicitly for vm_unmapped_area
2020-10-01 13:17:54 +02:00
mm: fix kthread_use_mm() vs TLB invalidate
2020-09-03 11:26:51 +02:00
mm/mmu_gather: invalidate TLB correctly on batch allocation failure and flush
2020-02-11 04:35:42 -08:00
mm/mmu_notifiers: use the right return code for WARN_ON
2019-11-06 08:47:50 -08:00
mm, numa: fix bad pmd by atomically check for pmd_trans_huge when marking page tables prot_numa
2020-03-12 13:00:19 +01:00
mm: Fix mremap not considering huge pmd devmap
2020-06-07 13:18:46 +02:00
x86/mm: split vmalloc_sync_all()
2020-03-25 08:25:58 +01:00
mm, oom_adj: don't loop through tasks in __set_oom_adj when not necessary
2020-10-29 09:57:45 +01:00
mm/page-writeback.c: avoid potential division by zero in wb_min_max_ratio()
2020-01-23 08:22:41 +01:00
mm: don't wake kswapd prematurely when watermark boosting is disabled
2020-12-30 11:51:27 +01:00
mm/page_counter.c: fix protection usage propagation
2020-08-21 13:05:27 +02:00
swap: fix swapfile read/write offset
2021-03-07 12:20:49 +01:00
mm/memory_hotplug: drain per-cpu pages again during memory offline
2020-09-23 12:40:47 +02:00
mm/page_owner: change split_page_owner to take a count
2020-10-29 09:57:52 +01:00
mm: pagewalk: fix termination condition in walk_pte_range()
2020-10-01 13:17:30 +02:00
percpu: fix first chunk size calculation for populated bitmap
2020-09-23 12:40:45 +02:00
mm: include <linux/huge_mm.h> for is_vma_temporary_stack
2019-10-19 06:32:32 -04:00
mm/hugetlb: fix F_SEAL_FUTURE_WRITE
2021-05-19 10:08:29 +02:00
mm/shuffle: don't move pages between zones and don't read garbage memmaps
2020-09-03 11:26:51 +02:00
mm, debug_pagealloc: don't rely on static keys too early
2020-01-23 08:22:40 +01:00
mm: slab: make page_cgroup_ino() to recognize non-compound slab pages properly
2019-11-06 08:47:50 -08:00
mm: memcg/slab: fix memory leak at non-root kmem_cache destroy
2020-07-29 10:18:44 +02:00
Revert "mm, slub: consider rest of partial list if acquire_slab() fails"
2021-03-17 17:03:34 +01:00
mm/sparse: add the missing sparse_buffer_fini() in error branch
2021-05-14 09:44:32 +02:00
mm/swap_state: fix a data race in swapin_nr_pages
2020-10-01 13:18:08 +02:00
swap: fix swapfile read/write offset
2021-03-07 12:20:49 +01:00
mm/thp: allow dropping THP from page cache
2019-10-19 06:32:33 -04:00
hugetlbfs: hugetlb_fault_mutex_hash() cleanup
2021-03-30 14:35:19 +02:00
mm: add kvfree_sensitive() for freeing sensitive data objects
2020-06-17 16:40:23 +02:00
mm/vunmap: add cond_resched() in vunmap_pmd_range
2020-09-03 11:26:52 +02:00
mm/vmscan.c: fix data races using kswapd_classzone_idx
2020-10-01 13:17:53 +02:00
mm, vmstat: reduce zone->lock holding time by /proc/pagetypeinfo
2019-11-06 08:47:50 -08:00
zsmalloc: account the number of compacted pages correctly
2021-03-07 12:20:49 +01:00
3b7f3cab1d