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BUG: KCSAN: data-race in ext4_es_lookup_extent / ext4_es_lookup_extent

read to 0xffff888104a0fc28 of 8 bytes by task 8572 on cpu 1:
 ext4_es_lookup_extent+0x2a8/0x500 fs/ext4/extents_status.c:966
 ext4_map_blocks+0x10e/0xf00 fs/ext4/inode.c:529
 ext4_iomap_begin+0x17b/0x630 fs/ext4/inode.c:3420
 iomap_iter+0x395/0x4a0 fs/iomap/iter.c:74
 __iomap_dio_rw+0xb24/0xf20 fs/iomap/direct-io.c:571
 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:656
 ext4_dio_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter+0x21a/0x290 fs/ext4/file.c:128
 call_read_iter include/linux/fs.h:2155 [inline]
 generic_file_splice_read+0x24f/0x330 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

write to 0xffff888104a0fc28 of 8 bytes by task 8535 on cpu 0:
 ext4_es_set_referenced fs/ext4/extents_status.h:194 [inline]
 ext4_es_lookup_extent+0x2f7/0x500 fs/ext4/extents_status.c:968
 ext4_map_blocks+0x10e/0xf00 fs/ext4/inode.c:529
 ext4_mpage_readpages+0x603/0x11f0 fs/ext4/readpage.c:304
 ext4_readahead+0x99/0xa0 fs/ext4/inode.c:3202
 read_pages+0xba/0x5f0 mm/readahead.c:129
 page_cache_ra_unbounded+0x3d2/0x430 mm/readahead.c:238
 ondemand_readahead+0x4f8/0x700
 page_cache_sync_ra+0xaf/0xe0 mm/readahead.c:579
 page_cache_sync_readahead include/linux/pagemap.h:980 [inline]
 filemap_get_pages mm/filemap.c:2541 [inline]
 filemap_read+0x3d8/0x1720 mm/filemap.c:2624
 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2775
 ext4_file_read_iter+0x1db/0x290
 call_read_iter include/linux/fs.h:2155 [inline]
 generic_file_splice_read+0x24f/0x330 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x080000000000981c -> 0x880000000000981c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8535 Comm: syz-executor.5 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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