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BUG: KCSAN: data-race in ext4_ext_insert_extent / ext4_mark_iloc_dirty

write to 0xffff888106359202 of 2 bytes by task 10438 on cpu 0:
 le16_add_cpu include/linux/byteorder/generic.h:146 [inline]
 ext4_ext_insert_extent+0x1ab7/0x2d90 fs/ext4/extents.c:2121
 ext4_ext_map_blocks+0x1714/0x1ff0 fs/ext4/extents.c:4271
 ext4_map_blocks+0x71e/0xf00 fs/ext4/inode.c:637
 mpage_map_one_extent+0x10d/0x360 fs/ext4/inode.c:2401
 mpage_map_and_submit_extent fs/ext4/inode.c:2454 [inline]
 ext4_writepages+0xc5a/0x1d70 fs/ext4/inode.c:2806
 do_writepages+0x26b/0x3c0 mm/page-writeback.c:2364
 filemap_fdatawrite_wbc mm/filemap.c:400 [inline]
 __filemap_fdatawrite_range mm/filemap.c:433 [inline]
 filemap_write_and_wait_range+0x238/0x3c0 mm/filemap.c:704
 __iomap_dio_rw+0x4ca/0x1010 fs/iomap/direct-io.c:540
 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:649
 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:2157 [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+0x63e/0xbb0 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1314 [inline]
 __se_sys_sendfile64 fs/read_write.c:1300 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300
 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

read to 0xffff888106359200 of 4 bytes by task 10431 on cpu 1:
 ext4_do_update_inode fs/ext4/inode.c:5117 [inline]
 ext4_mark_iloc_dirty+0xc64/0x1700 fs/ext4/inode.c:5741
 __ext4_mark_inode_dirty+0x4ec/0x5c0 fs/ext4/inode.c:5937
 ext4_dirty_inode+0x86/0xa0 fs/ext4/inode.c:5966
 __mark_inode_dirty+0x77/0x6a0 fs/fs-writeback.c:2398
 generic_update_time fs/inode.c:1774 [inline]
 update_time fs/inode.c:1787 [inline]
 file_update_time+0x3b5/0x3f0 fs/inode.c:2003
 ext4_page_mkwrite+0x11a/0xec0 fs/ext4/inode.c:6084
 do_page_mkwrite mm/memory.c:2870 [inline]
 wp_page_shared mm/memory.c:3203 [inline]
 do_wp_page+0x86c/0xba0 mm/memory.c:3304
 handle_pte_fault mm/memory.c:4576 [inline]
 __handle_mm_fault mm/memory.c:4693 [inline]
 handle_mm_fault+0x96e/0x1580 mm/memory.c:4791
 do_user_addr_fault+0x609/0xbe0 arch/x86/mm/fault.c:1390
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x91/0x220 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30

value changed: 0x0001f30a -> 0x0002f30a

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10431 Comm: syz-executor.1 Tainted: G        W         5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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