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BUG: KCSAN: data-race in iput / writeback_sb_inodes

write to 0xffff8880a2996788 of 8 bytes by task 23115 on cpu 0:
 inode_io_list_del_locked fs/fs-writeback.c:148 [inline]
 requeue_inode fs/fs-writeback.c:1440 [inline]
 writeback_sb_inodes+0xc9b/0xff0 fs/fs-writeback.c:1748
 __writeback_inodes_wb+0xb0/0x2b0 fs/fs-writeback.c:1790
 wb_writeback+0x2b0/0x6f0 fs/fs-writeback.c:1896
 wb_check_start_all fs/fs-writeback.c:2020 [inline]
 wb_do_writeback+0x423/0x5f0 fs/fs-writeback.c:2046
 wb_workfn+0xc8/0x470 fs/fs-writeback.c:2080
 process_one_work+0x3e1/0x9a0 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

read to 0xffff8880a2996788 of 8 bytes by task 8746 on cpu 1:
 iput+0x2e/0x550 fs/inode.c:1668
 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8746 Comm: syz-executor.3 Not tainted 5.9.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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