syzbot

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BUG: KCSAN: data-race in __writeback_single_inode / inode_io_list_del

write to 0xffff888106bb57c8 of 8 bytes by task 10996 on cpu 1:
 inode_io_list_del_locked fs/fs-writeback.c:148 [inline]
 inode_io_list_del+0x10c/0x2f0 fs/fs-writeback.c:1127
 evict+0xac/0x3c0 fs/inode.c:571
 iput_final fs/inode.c:1660 [inline]
 iput+0x433/0x590 fs/inode.c:1686
 do_unlinkat+0x293/0x4f0 fs/namei.c:4099
 __do_sys_unlink fs/namei.c:4139 [inline]
 __se_sys_unlink fs/namei.c:4137 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4137
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888106bb57c8 of 8 bytes by task 23857 on cpu 0:
 __writeback_single_inode+0x46/0x450 fs/fs-writeback.c:1463
 writeback_sb_inodes+0x564/0xf10 fs/fs-writeback.c:1732
 wb_writeback+0x28e/0x700 fs/fs-writeback.c:1905
 wb_do_writeback+0x101/0x510 fs/fs-writeback.c:2050
 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

value changed: 0x0000000000020081 -> 0x00000000000000a1

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 23857 Comm: kworker/u4:7 Tainted: G        W         5.13.0-rc7-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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