==================================================================
BUG: KCSAN: data-race in iput / writeback_sb_inodes

write to 0xffff88810d9d36f8 of 8 bytes by task 57 on cpu 1:
 inode_io_list_del_locked fs/fs-writeback.c:148 [inline]
 requeue_inode fs/fs-writeback.c:1440 [inline]
 writeback_sb_inodes+0xc56/0x1020 fs/fs-writeback.c:1748
 wb_writeback+0x27d/0x660 fs/fs-writeback.c:1894
 wb_do_writeback+0x101/0x5d0 fs/fs-writeback.c:2039
 wb_workfn+0xb8/0x410 fs/fs-writeback.c:2080
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x635/0xb90 kernel/workqueue.c:2421
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff88810d9d36f8 of 8 bytes by task 26996 on cpu 0:
 iput+0x2e/0x510 fs/inode.c:1669
 do_unlinkat+0x2c9/0x4d0 fs/namei.c:3905
 __do_sys_unlink fs/namei.c:3945 [inline]
 __se_sys_unlink fs/namei.c:3943 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3943
 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: 0 PID: 26996 Comm: syz-executor.5 Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================