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BUG: KCSAN: data-race in __es_shrink / __es_shrink

write to 0xffff888217d51c80 of 8 bytes by task 16617 on cpu 1:
 __es_shrink+0x395/0x580 fs/ext4/extents_status.c:1515
 ext4_es_scan+0x88/0x270 fs/ext4/extents_status.c:1559
 do_shrink_slab+0x286/0x5c0 mm/vmscan.c:513
 shrink_slab+0xea/0x1c0 mm/vmscan.c:674
 shrink_node_memcgs+0x270/0x410 mm/vmscan.c:2653
 shrink_node+0x9ed/0x1230 mm/vmscan.c:2768
 shrink_zones+0x2af/0x490 mm/vmscan.c:2971
 do_try_to_free_pages+0x193/0x6e0 mm/vmscan.c:3026
 try_to_free_pages+0x38e/0x8b0 mm/vmscan.c:3265
 __perform_reclaim mm/page_alloc.c:4273 [inline]
 __alloc_pages_direct_reclaim mm/page_alloc.c:4294 [inline]
 __alloc_pages_slowpath+0x55f/0x9e0 mm/page_alloc.c:4698
 __alloc_pages_nodemask+0x266/0x380 mm/page_alloc.c:4914
 alloc_pages_current+0x21d/0x310 mm/mempolicy.c:2275
 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

read to 0xffff888217d51c80 of 8 bytes by task 16636 on cpu 0:
 __es_shrink+0x367/0x580 fs/ext4/extents_status.c:1515
 ext4_es_scan+0x88/0x270 fs/ext4/extents_status.c:1559
 do_shrink_slab+0x286/0x5c0 mm/vmscan.c:513
 shrink_slab+0xea/0x1c0 mm/vmscan.c:674
 shrink_node_memcgs+0x270/0x410 mm/vmscan.c:2653
 shrink_node+0x9ed/0x1230 mm/vmscan.c:2768
 shrink_zones+0x2af/0x490 mm/vmscan.c:2971
 do_try_to_free_pages+0x193/0x6e0 mm/vmscan.c:3026
 try_to_free_pages+0x38e/0x8b0 mm/vmscan.c:3265
 __perform_reclaim mm/page_alloc.c:4273 [inline]
 __alloc_pages_direct_reclaim mm/page_alloc.c:4294 [inline]
 __alloc_pages_slowpath+0x55f/0x9e0 mm/page_alloc.c:4698
 __alloc_pages_nodemask+0x266/0x380 mm/page_alloc.c:4914
 alloc_pages_vma+0x3e6/0x890 mm/mempolicy.c:2238
 wp_page_copy+0x16b/0x1710 mm/memory.c:2863
 do_wp_page+0x4c6/0x740 arch/x86/include/asm/atomic.h:95
 handle_pte_fault mm/memory.c:4418 [inline]
 __handle_mm_fault mm/memory.c:4535 [inline]
 handle_mm_fault+0x1899/0x1af0 mm/memory.c:4633
 do_user_addr_fault+0x380/0x770 arch/x86/mm/fault.c:1372
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1482
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538
 __put_user_4+0x1c/0x30 arch/x86/lib/putuser.S:68
 schedule_tail+0x58/0xc0 kernel/sched/core.c:3718
 ret_from_fork+0x8/0x30 arch/x86/entry/entry_64.S:279

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 16636 Comm: syz-executor.3 Not tainted 5.9.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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