syzbot

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BUG: KCSAN: data-race in iput / move_expired_inodes

read-write to 0xffff88810a5e9d20 of 8 bytes by task 3123 on cpu 0:
 move_expired_inodes+0x17b/0x410 fs/fs-writeback.c:1388
 queue_io+0xe1/0x2e0 fs/fs-writeback.c:1440
 wb_writeback+0x22a/0x6e0 fs/fs-writeback.c:2068
 wb_do_writeback fs/fs-writeback.c:2217 [inline]
 wb_workfn+0x1a8/0x8d0 fs/fs-writeback.c:2257
 process_one_work+0x434/0x860 kernel/workqueue.c:2597
 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2748
 kthread+0x1d7/0x210 kernel/kthread.c:389
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffff88810a5e9d20 of 8 bytes by task 3081 on cpu 1:
 iput+0x32/0x5b0 fs/inode.c:1805
 dentry_unlink_inode+0x22a/0x240 fs/dcache.c:401
 d_delete+0x76/0xf0 fs/dcache.c:2565
 d_delete_notify include/linux/fsnotify.h:261 [inline]
 vfs_rmdir+0x1a0/0x2f0 fs/namei.c:4213
 do_rmdir+0x194/0x310 fs/namei.c:4259
 __do_sys_unlinkat fs/namei.c:4437 [inline]
 __se_sys_unlinkat fs/namei.c:4431 [inline]
 __x64_sys_unlinkat+0xa4/0xb0 fs/namei.c:4431
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000001 -> 0x0000000000020080

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3081 Comm: syz-executor.5 Tainted: G        W          6.4.0-syzkaller-12069-gc17414a273b8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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