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BUG: KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode

write to 0xffff88821b861bf0 of 8 bytes by task 9568 on cpu 0:
 __writeback_single_inode+0x328/0x8e0 fs/fs-writeback.c:1486
 writeback_sb_inodes+0x4ba/0xa50 fs/fs-writeback.c:1716
 __writeback_inodes_wb+0xe8/0x1b0 fs/fs-writeback.c:1785
 wb_writeback+0x557/0x6a0 fs/fs-writeback.c:1894
 wb_check_old_data_flush fs/fs-writeback.c:1996 [inline]
 wb_do_writeback fs/fs-writeback.c:2049 [inline]
 wb_workfn+0x7bb/0x970 fs/fs-writeback.c:2078
 process_one_work+0x40b/0x8d0 kernel/workqueue.c:2264
 worker_thread+0xa0/0x800 kernel/workqueue.c:2410
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

read to 0xffff88821b861bf0 of 8 bytes by task 32709 on cpu 1:
 __mark_inode_dirty+0xb8/0x940 fs/fs-writeback.c:2272
 mark_buffer_dirty+0x29c/0x2c0 fs/buffer.c:1156
 mark_buffer_dirty_inode+0x6d/0x260 fs/buffer.c:590
 __ext4_handle_dirty_metadata+0x178/0x3e0 fs/ext4/ext4_jbd2.c:312
 ext4_handle_dirty_dirblock+0x20a/0x280 fs/ext4/namei.c:404
 ext4_delete_entry+0x266/0x2c0 fs/ext4/namei.c:2509
 ext4_unlink fs/ext4/namei.c:3199 [inline]
 ext4_unlink+0x30b/0x7d0 fs/ext4/namei.c:3154
 vfs_unlink+0x225/0x3e0 fs/namei.c:4003
 do_unlinkat+0x32b/0x530 fs/namei.c:4067
 __do_sys_unlink fs/namei.c:4114 [inline]
 __se_sys_unlink fs/namei.c:4112 [inline]
 __x64_sys_unlink+0x3b/0x50 fs/namei.c:4112
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 32709 Comm: syz-executor.1 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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