==================================================================
BUG: KCSAN: data-race in get_scan_count / mem_cgroup_update_lru_size

write to 0xffff88812bd50608 of 8 bytes by task 18248 on cpu 1:
 mem_cgroup_update_lru_size+0x53/0xf0 mm/memcontrol.c:1381
 update_lru_size include/linux/mm_inline.h:44 [inline]
 move_pages_to_lru+0x2f5/0x9d0 mm/vmscan.c:1867
 shrink_inactive_list+0x29b/0x610 mm/vmscan.c:1964
 shrink_list mm/vmscan.c:2169 [inline]
 shrink_lruvec+0x38a/0x620 mm/vmscan.c:2464
 shrink_node_memcgs+0x233/0x410 mm/vmscan.c:2644
 shrink_node+0x94e/0x1140 mm/vmscan.c:2758
 shrink_zones+0x2af/0x490 mm/vmscan.c:2961
 do_try_to_free_pages+0x1b4/0x6c0 mm/vmscan.c:3014
 try_to_free_pages+0x38e/0x8b0 mm/vmscan.c:3253
 __perform_reclaim mm/page_alloc.c:4254 [inline]
 __alloc_pages_direct_reclaim mm/page_alloc.c:4275 [inline]
 __alloc_pages_slowpath+0x55f/0x9e0 mm/page_alloc.c:4679
 __alloc_pages_nodemask+0x266/0x380 mm/page_alloc.c:4895
 alloc_pages_current+0x21d/0x310 mm/mempolicy.c:2292
 alloc_pages include/linux/gfp.h:545 [inline]
 __page_cache_alloc+0x4f/0x120 mm/filemap.c:957
 pagecache_get_page+0x494/0x900 mm/filemap.c:1710
 filemap_fault+0xba4/0x11e0 mm/filemap.c:2591
 ext4_filemap_fault+0x4b/0x60 fs/ext4/inode.c:6060
 __do_fault mm/memory.c:3467 [inline]
 do_read_fault+0x41f/0x730 mm/memory.c:3860
 do_fault mm/memory.c:3988 [inline]
 handle_pte_fault mm/memory.c:4228 [inline]
 __handle_mm_fault mm/memory.c:4360 [inline]
 handle_mm_fault+0x136c/0x1950 mm/memory.c:4397
 do_user_addr_fault+0x393/0x810 arch/x86/mm/fault.c:1294
 handle_page_fault arch/x86/mm/fault.c:1364 [inline]
 exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1417
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538

read to 0xffff88812bd50608 of 8 bytes by task 18251 on cpu 0:
 mem_cgroup_get_zone_lru_size include/linux/memcontrol.h:625 [inline]
 lruvec_lru_size mm/vmscan.c:327 [inline]
 get_scan_count+0x2be/0x790 mm/vmscan.c:2329
 shrink_lruvec+0x5a/0x620 mm/vmscan.c:2434
 shrink_node_memcgs+0x233/0x410 mm/vmscan.c:2644
 shrink_node+0x94e/0x1140 mm/vmscan.c:2758
 shrink_zones+0x2af/0x490 mm/vmscan.c:2961
 do_try_to_free_pages+0x1b4/0x6c0 mm/vmscan.c:3014
 try_to_free_pages+0x38e/0x8b0 mm/vmscan.c:3253
 __perform_reclaim mm/page_alloc.c:4254 [inline]
 __alloc_pages_direct_reclaim mm/page_alloc.c:4275 [inline]
 __alloc_pages_slowpath+0x55f/0x9e0 mm/page_alloc.c:4679
 __alloc_pages_nodemask+0x266/0x380 mm/page_alloc.c:4895
 alloc_pages_current+0x21d/0x310 mm/mempolicy.c:2292
 alloc_pages include/linux/gfp.h:545 [inline]
 ion_page_pool_alloc_pages drivers/staging/android/ion/ion_page_pool.c:19 [inline]
 ion_page_pool_alloc+0x230/0x260 drivers/staging/android/ion/ion_page_pool.c:78
 alloc_buffer_page drivers/staging/android/ion/ion_system_heap.c:53 [inline]
 alloc_largest_available drivers/staging/android/ion/ion_system_heap.c:87 [inline]
 ion_system_heap_allocate+0x1e0/0x6b0 drivers/staging/android/ion/ion_system_heap.c:118
 ion_buffer_create drivers/staging/android/ion/ion.c:50 [inline]
 ion_alloc drivers/staging/android/ion/ion.c:366 [inline]
 ion_ioctl+0x2d5/0xa00 drivers/staging/android/ion/ion.c:492
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:739
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 18251 Comm: syz-executor.1 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================