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BUG: KCSAN: data-race in __mark_inode_dirty / move_expired_inodes

write to 0xffff888101353bc8 of 8 bytes by task 3623 on cpu 1:
 move_expired_inodes+0x1ca/0x4c0 fs/fs-writeback.c:1257
 queue_io+0xe1/0x280 fs/fs-writeback.c:1304
 wb_writeback+0x265/0x700 fs/fs-writeback.c:1903
 wb_check_start_all fs/fs-writeback.c:2031 [inline]
 wb_do_writeback+0x330/0x510 fs/fs-writeback.c:2057
 wb_workfn+0xc8/0x520 fs/fs-writeback.c:2091
 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276
 worker_thread+0x636/0xae0 kernel/workqueue.c:2422
 kthread+0x1d0/0x1f0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff888101353bc8 of 8 bytes by task 18227 on cpu 0:
 __mark_inode_dirty+0xda/0x6c0 fs/fs-writeback.c:2295
 mark_buffer_dirty+0x143/0x200 fs/buffer.c:1137
 __ext4_handle_dirty_metadata+0x20c/0x590 fs/ext4/ext4_jbd2.c:362
 __ext4_new_inode+0x1f0d/0x2f70 fs/ext4/ialloc.c:1229
 ext4_symlink+0x2c3/0x700 fs/ext4/namei.c:3465
 vfs_symlink+0x23a/0x300 fs/namei.c:4172
 do_symlinkat+0xeb/0x280 fs/namei.c:4202
 __do_sys_symlink fs/namei.c:4223 [inline]
 __se_sys_symlink fs/namei.c:4221 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:4221
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000004 -> 0x0000000000020084

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 18227 Comm: syz-executor.5 Not tainted 5.13.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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