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BUG: KCSAN: data-race in ext4_es_lookup_extent / ext4_es_lookup_extent

read to 0xffff8881258bbd68 of 8 bytes by task 28155 on cpu 0:
 ext4_es_lookup_extent+0x3c8/0x580 fs/ext4/extents_status.c:948
 ext4_map_blocks+0xbd/0xfa0 fs/ext4/inode.c:530
 ext4_mpage_readpages+0x932/0x12c0 fs/ext4/readpage.c:296
 ext4_readpages+0x92/0xc0 fs/ext4/inode.c:3342
 read_pages+0xa2/0x2d0 mm/readahead.c:126
 __do_page_cache_readahead+0x2bb/0x390 mm/readahead.c:190
 ra_submit mm/internal.h:62 [inline]
 do_sync_mmap_readahead mm/filemap.c:2442 [inline]
 filemap_fault+0xdad/0xf90 mm/filemap.c:2528
 ext4_filemap_fault+0x59/0x72 fs/ext4/inode.c:6292
 __do_fault+0xae/0x1f0 mm/memory.c:3092
 do_read_fault mm/memory.c:3489 [inline]
 do_fault mm/memory.c:3618 [inline]
 handle_pte_fault mm/memory.c:3849 [inline]
 __handle_mm_fault+0x1fa0/0x2cb0 mm/memory.c:3973
 handle_mm_fault+0x21b/0x530 mm/memory.c:4010
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x3fb/0x9e0 arch/x86/mm/fault.c:1506
 do_page_fault+0x54/0x233 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1202

write to 0xffff8881258bbd68 of 8 bytes by task 28152 on cpu 1:
 ext4_es_set_referenced fs/ext4/extents_status.h:194 [inline]
 ext4_es_lookup_extent+0x406/0x580 fs/ext4/extents_status.c:950
 ext4_map_blocks+0xbd/0xfa0 fs/ext4/inode.c:530
 ext4_mpage_readpages+0x932/0x12c0 fs/ext4/readpage.c:296
 ext4_readpages+0x92/0xc0 fs/ext4/inode.c:3342
 read_pages+0xa2/0x2d0 mm/readahead.c:126
 __do_page_cache_readahead+0x353/0x390 mm/readahead.c:212
 ra_submit mm/internal.h:62 [inline]
 do_sync_mmap_readahead mm/filemap.c:2442 [inline]
 filemap_fault+0xdad/0xf90 mm/filemap.c:2528
 ext4_filemap_fault+0x59/0x72 fs/ext4/inode.c:6292
 __do_fault+0xae/0x1f0 mm/memory.c:3092
 do_shared_fault mm/memory.c:3544 [inline]
 do_fault mm/memory.c:3622 [inline]
 handle_pte_fault mm/memory.c:3849 [inline]
 __handle_mm_fault+0x2029/0x2cb0 mm/memory.c:3973
 handle_mm_fault+0x21b/0x530 mm/memory.c:4010
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x3fb/0x9e0 arch/x86/mm/fault.c:1506
 do_page_fault+0x54/0x233 arch/x86/mm/fault.c:1530

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 28152 Comm: syz-executor.0 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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