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BUG: KCSAN: data-race in ext4_ext_insert_extent / ext4_mark_iloc_dirty

read-write to 0xffff88800be45a82 of 2 bytes by task 11382 on cpu 1:
 le16_add_cpu include/linux/byteorder/generic.h:146 [inline]
 ext4_ext_insert_extent+0x1981/0x2b50 fs/ext4/extents.c:2112
 ext4_ext_map_blocks+0x1761/0x1fd0 fs/ext4/extents.c:4261
 ext4_map_blocks+0x71b/0xfc0 fs/ext4/inode.c:626
 mpage_map_one_extent+0x10d/0x390 fs/ext4/inode.c:2385
 mpage_map_and_submit_extent fs/ext4/inode.c:2438 [inline]
 ext4_writepages+0xa2c/0x1e10 fs/ext4/inode.c:2790
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __filemap_fdatawrite_range+0x19d/0x1d0 mm/filemap.c:422
 filemap_write_and_wait_range+0x8b/0x2a0 mm/filemap.c:655
 __iomap_dio_rw+0x38c/0x9b0 fs/iomap/direct-io.c:489
 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:605
 ext4_dio_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter+0x3bd/0x420 fs/ext4/file.c:129
 call_read_iter include/linux/fs.h:1881 [inline]
 generic_file_splice_read+0x22a/0x310 fs/splice.c:311
 do_splice_to fs/splice.c:788 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867
 do_splice_direct+0xf5/0x170 fs/splice.c:976
 do_sendfile+0x574/0xb70 fs/read_write.c:1257
 __do_sys_sendfile64 fs/read_write.c:1318 [inline]
 __se_sys_sendfile64 fs/read_write.c:1304 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88800be45a80 of 4 bytes by task 11381 on cpu 0:
 ext4_do_update_inode fs/ext4/inode.c:5102 [inline]
 ext4_mark_iloc_dirty+0xcc0/0x1650 fs/ext4/inode.c:5709
 __ext4_mark_inode_dirty+0x450/0x610 fs/ext4/inode.c:5903
 ext4_dirty_inode+0xa6/0xc0 fs/ext4/inode.c:5939
 __mark_inode_dirty+0x74/0x740 fs/fs-writeback.c:2260
 generic_update_time fs/inode.c:1764 [inline]
 update_time fs/inode.c:1777 [inline]
 touch_atime+0x157/0x1a0 fs/inode.c:1848
 file_accessed include/linux/fs.h:2204 [inline]
 generic_file_buffered_read+0x1a1c/0x2110 mm/filemap.c:2458
 generic_file_read_iter+0x80/0x3d0 mm/filemap.c:2535
 ext4_file_read_iter+0x2d0/0x420 fs/ext4/file.c:74
 call_read_iter include/linux/fs.h:1881 [inline]
 generic_file_splice_read+0x22a/0x310 fs/splice.c:311
 do_splice_to fs/splice.c:788 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867
 do_splice_direct+0xf5/0x170 fs/splice.c:976
 do_sendfile+0x574/0xb70 fs/read_write.c:1257
 __do_sys_sendfile64 fs/read_write.c:1318 [inline]
 __se_sys_sendfile64 fs/read_write.c:1304 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304
 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: 11381 Comm: syz-executor.4 Not tainted 5.10.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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