syzbot

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BUG: KCSAN: data-race in iput / move_expired_inodes

read-write to 0xffff8881064eef60 of 8 bytes by task 11 on cpu 0:
 move_expired_inodes+0x17b/0x410 fs/fs-writeback.c:1405
 queue_io+0xe1/0x2e0 fs/fs-writeback.c:1457
 wb_writeback+0x22a/0x6e0 fs/fs-writeback.c:2090
 wb_do_writeback fs/fs-writeback.c:2239 [inline]
 wb_workfn+0x1a8/0x8d0 fs/fs-writeback.c:2279
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x5b8/0xa40 kernel/workqueue.c:2706
 worker_thread+0x525/0x730 kernel/workqueue.c:2787
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

read to 0xffff8881064eef60 of 8 bytes by task 3090 on cpu 1:
 iput+0x32/0x5c0 fs/inode.c:1755
 dentry_unlink_inode+0x22a/0x240 fs/dcache.c:400
 d_delete+0x76/0xf0 fs/dcache.c:2389
 d_delete_notify include/linux/fsnotify.h:299 [inline]
 vfs_rmdir+0x1a0/0x2f0 fs/namei.c:4218
 do_rmdir+0x194/0x320 fs/namei.c:4264
 __do_sys_unlinkat fs/namei.c:4440 [inline]
 __se_sys_unlinkat fs/namei.c:4434 [inline]
 __x64_sys_unlinkat+0xa4/0xb0 fs/namei.c:4434
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000000000001 -> 0x0000000000020080

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3090 Comm: syz-executor.4 Not tainted 6.8.0-rc3-syzkaller-00215-ge6f39a90de92 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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