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BUG: KCSAN: data-race in ext4_ext_try_to_merge_right / ext4_mark_iloc_dirty

write to 0xffff88813e967210 of 2 bytes by task 8301 on cpu 1:
 ext4_ext_try_to_merge_right+0x285/0x4c0 fs/ext4/extents.c:1776
 ext4_ext_try_to_merge+0x6b/0x310 fs/ext4/extents.c:1860
 ext4_convert_unwritten_extents_endio fs/ext4/extents.c:3733 [inline]
 ext4_ext_handle_unwritten_extents+0x680/0xa90 fs/ext4/extents.c:3861
 ext4_ext_map_blocks+0x719/0x1f10 fs/ext4/extents.c:4131
 ext4_map_blocks+0x70d/0xef0 fs/ext4/inode.c:637
 ext4_convert_unwritten_extents+0x15a/0x2c0 fs/ext4/extents.c:4773
 ext4_convert_unwritten_io_end_vec+0xa4/0x130 fs/ext4/extents.c:4812
 ext4_end_io_end fs/ext4/page-io.c:184 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:257 [inline]
 ext4_end_io_rsv_work+0x198/0x360 fs/ext4/page-io.c:271
 process_one_work+0x402/0x910 kernel/workqueue.c:2297
 worker_thread+0x636/0xae0 kernel/workqueue.c:2444
 kthread+0x262/0x280 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

read to 0xffff88813e967210 of 4 bytes by task 22061 on cpu 0:
 ext4_do_update_inode fs/ext4/inode.c:5117 [inline]
 ext4_mark_iloc_dirty+0xcc8/0x1700 fs/ext4/inode.c:5741
 __ext4_mark_inode_dirty+0x4db/0x5b0 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
 mark_inode_dirty include/linux/fs.h:2452 [inline]
 generic_write_end+0x157/0x180 fs/buffer.c:2198
 ext4_da_write_end+0x59b/0x730 fs/ext4/inode.c:3116
 generic_perform_write+0x23a/0x3d0 mm/filemap.c:3784
 ext4_buffered_write_iter+0x305/0x400 fs/ext4/file.c:269
 ext4_file_write_iter+0x2e7/0x11a0 fs/ext4/file.c:519
 call_write_iter include/linux/fs.h:2163 [inline]
 do_iter_readv_writev+0x2cd/0x370 fs/read_write.c:729
 do_iter_write+0x192/0x5c0 fs/read_write.c:855
 vfs_iter_write+0x4c/0x70 fs/read_write.c:896
 iter_file_splice_write+0x40a/0x750 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x618/0xb90 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+0xf2/0x130 fs/read_write.c:1300
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000085e -> 0x0000086e

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22061 Comm: syz-executor.3 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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