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BUG: KCSAN: data-race in __writeback_single_inode / inode_io_list_del

write to 0xffff8880a6b86a90 of 8 bytes by task 27452 on cpu 1:
 inode_io_list_del_locked fs/fs-writeback.c:148 [inline]
 inode_io_list_del+0xa1/0x240 fs/fs-writeback.c:1127
 evict+0xac/0x470 fs/inode.c:563
 iput_final fs/inode.c:1652 [inline]
 iput+0x421/0x520 fs/inode.c:1678
 do_unlinkat+0x2c9/0x4d0 fs/namei.c:3902
 __do_sys_unlink fs/namei.c:3942 [inline]
 __se_sys_unlink fs/namei.c:3940 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3940
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880a6b86a90 of 8 bytes by task 19764 on cpu 0:
 __writeback_single_inode+0x45/0x580 fs/fs-writeback.c:1457
 writeback_sb_inodes+0x6c0/0xfd0 fs/fs-writeback.c:1721
 wb_writeback+0x28d/0x670 fs/fs-writeback.c:1894
 wb_do_writeback+0x101/0x5d0 fs/fs-writeback.c:2039
 wb_workfn+0xc8/0x430 fs/fs-writeback.c:2080
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2269
 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415
 kthread+0x20d/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 19764 Comm: kworker/u4:8 Not tainted 5.9.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
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