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BUG: KCSAN: data-race in ext4_ext_try_to_merge_right / ext4_mark_iloc_dirty

write to 0xffff88811edc5290 of 2 bytes by task 13420 on cpu 1:
 ext4_ext_try_to_merge_right+0x285/0x4c0 fs/ext4/extents.c:1773
 ext4_ext_try_to_merge+0x6b/0x310 fs/ext4/extents.c:1857
 ext4_convert_unwritten_extents_endio fs/ext4/extents.c:3726 [inline]
 ext4_ext_handle_unwritten_extents+0x625/0xaa0 fs/ext4/extents.c:3854
 ext4_ext_map_blocks+0x758/0x20c0 fs/ext4/extents.c:4124
 ext4_map_blocks+0x6a6/0xf60 fs/ext4/inode.c:626
 ext4_convert_unwritten_extents+0x16a/0x2d0 fs/ext4/extents.c:4755
 ext4_convert_unwritten_io_end_vec+0xa4/0x130 fs/ext4/extents.c:4794
 ext4_end_io_end fs/ext4/page-io.c:187 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:260 [inline]
 ext4_end_io_rsv_work+0x198/0x350 fs/ext4/page-io.c:274
 process_one_work+0x3cb/0x990 kernel/workqueue.c:2269
 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415
 kthread+0x210/0x220 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

read to 0xffff88811edc5290 of 4 bytes by task 18696 on cpu 0:
 ext4_do_update_inode fs/ext4/inode.c:5042 [inline]
 ext4_mark_iloc_dirty+0xcd4/0x1630 fs/ext4/inode.c:5624
 __ext4_mark_inode_dirty+0x2b9/0x3f0 fs/ext4/inode.c:5818
 ext4_dirty_inode+0xa6/0xc0 fs/ext4/inode.c:5854
 __mark_inode_dirty+0x72/0x7d0 fs/fs-writeback.c:2258
 mark_inode_dirty include/linux/fs.h:2192 [inline]
 generic_write_end+0x174/0x2a0 fs/buffer.c:2203
 ext4_da_write_end+0x55e/0x6d0 fs/ext4/inode.c:3092
 generic_perform_write+0x233/0x380 mm/filemap.c:3310
 ext4_buffered_write_iter+0x2b1/0x390 fs/ext4/file.c:270
 ext4_file_write_iter+0x4a3/0xfd0 fs/ext4/file.c:498
 call_write_iter include/linux/fs.h:1907 [inline]
 new_sync_write fs/read_write.c:484 [inline]
 __vfs_write+0x2d8/0x340 fs/read_write.c:497
 vfs_write+0x19b/0x350 fs/read_write.c:559
 ksys_write+0xce/0x180 fs/read_write.c:612
 __do_sys_write fs/read_write.c:624 [inline]
 __se_sys_write fs/read_write.c:621 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:621
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 18696 Comm: syz-executor.5 Not tainted 5.8.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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