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BUG: KCSAN: data-race in ext4_es_lookup_extent / ext4_es_lookup_extent

write to 0xffff88812994bc28 of 8 bytes by task 8624 on cpu 1:
 ext4_es_lookup_extent+0x3d3/0x510 fs/ext4/extents_status.c:950
 ext4_map_blocks+0xc2/0xf70 fs/ext4/inode.c:530
 ext4_mpage_readpages+0x92b/0x1270 fs/ext4/readpage.c:182
 ext4_readpages+0x92/0xc0 fs/ext4/inode.c:3388
 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]
 ondemand_readahead+0x35d/0x710 mm/readahead.c:492
 page_cache_async_readahead+0x22c/0x250 mm/readahead.c:574
 generic_file_buffered_read mm/filemap.c:2079 [inline]
 generic_file_read_iter+0xffc/0x1440 mm/filemap.c:2344
 ext4_file_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter+0xfa/0x240 fs/ext4/file.c:65
 call_read_iter include/linux/fs.h:1864 [inline]
 generic_file_splice_read+0x35c/0x500 fs/splice.c:307
 do_splice_to+0xf2/0x130 fs/splice.c:877
 splice_direct_to_actor+0x1a1/0x510 fs/splice.c:954
 do_splice_direct+0x161/0x1e0 fs/splice.c:1063

read to 0xffff88812994bc28 of 8 bytes by task 8625 on cpu 0:
 ext4_es_lookup_extent+0x3ba/0x510 fs/ext4/extents_status.c:950
 ext4_map_blocks+0xc2/0xf70 fs/ext4/inode.c:530
 ext4_mpage_readpages+0x92b/0x1270 fs/ext4/readpage.c:182
 ext4_readpages+0x92/0xc0 fs/ext4/inode.c:3388
 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]
 ondemand_readahead+0x35d/0x710 mm/readahead.c:492
 page_cache_async_readahead+0x22c/0x250 mm/readahead.c:574
 generic_file_buffered_read mm/filemap.c:2079 [inline]
 generic_file_read_iter+0xffc/0x1440 mm/filemap.c:2344
 ext4_file_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter+0xfa/0x240 fs/ext4/file.c:65
 call_read_iter include/linux/fs.h:1864 [inline]
 generic_file_splice_read+0x35c/0x500 fs/splice.c:307
 do_splice_to+0xf2/0x130 fs/splice.c:877
 splice_direct_to_actor+0x1a1/0x510 fs/splice.c:954

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8625 Comm: syz-executor.1 Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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