syzbot

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BUG: KCSAN: data-race in __writeback_single_inode / inode_io_list_del

write to 0xffff88814e14ec50 of 8 bytes by task 807 on cpu 1:
 inode_io_list_del+0xdc/0x2b0 fs/fs-writeback.c:1273
 evict+0xac/0x3c0 fs/inode.c:573
 iput_final fs/inode.c:1662 [inline]
 iput+0x430/0x580 fs/inode.c:1688
 do_unlinkat+0x2a4/0x520 fs/namei.c:4176
 __do_sys_unlink fs/namei.c:4217 [inline]
 __se_sys_unlink fs/namei.c:4215 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4215
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88814e14ec50 of 8 bytes by task 1791 on cpu 0:
 __writeback_single_inode+0x46/0x440 fs/fs-writeback.c:1612
 writeback_sb_inodes+0x563/0xd30 fs/fs-writeback.c:1881
 wb_writeback+0x25d/0x6b0 fs/fs-writeback.c:2053
 wb_do_writeback+0x101/0x510 fs/fs-writeback.c:2196
 wb_workfn+0xc8/0x520 fs/fs-writeback.c:2237
 process_one_work+0x402/0x910 kernel/workqueue.c:2297
 worker_thread+0x636/0xae0 kernel/workqueue.c:2444
 kthread+0x262/0x280 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30

value changed: 0x0000000000020081 -> 0x00000000000000a1

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1791 Comm: kworker/u4:4 Not tainted 5.14.0-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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