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BUG: KCSAN: data-race in __d_drop / __d_lookup_rcu

read to 0xffff8881036090d0 of 8 bytes by task 1439 on cpu 0:
 hlist_bl_unhashed include/linux/list_bl.h:54 [inline]
 d_unhashed include/linux/dcache.h:332 [inline]
 __d_lookup_rcu+0x12f/0x400 fs/dcache.c:2347
 lookup_fast+0xc1/0x360 fs/namei.c:1630
 walk_component+0x6d/0x360 fs/namei.c:2016
 link_path_walk+0x52f/0x990
 path_parentat fs/namei.c:2546 [inline]
 filename_parentat+0x123/0x480 fs/namei.c:2569
 do_unlinkat+0x83/0x540 fs/namei.c:4189
 __do_sys_unlink fs/namei.c:4266 [inline]
 __se_sys_unlink fs/namei.c:4264 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4264
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

write to 0xffff8881036090d0 of 8 bytes by task 15656 on cpu 1:
 __hlist_bl_del include/linux/list_bl.h:128 [inline]
 ___d_drop fs/dcache.c:500 [inline]
 __d_drop+0x116/0x250 fs/dcache.c:507
 __dentry_kill+0x12f/0x450 fs/dcache.c:602
 shrink_dentry_list+0x478/0x540 fs/dcache.c:1201
 prune_dcache_sb+0x72/0xa0 fs/dcache.c:1282
 super_cache_scan+0x23e/0x2e0 fs/super.c:104
 do_shrink_slab+0x2ae/0x600 mm/vmscan.c:773
 shrink_slab_memcg+0x1c2/0x440 mm/vmscan.c:842
 shrink_slab+0x5c/0x1c0 mm/vmscan.c:921
 shrink_node_memcgs+0x27a/0x410 mm/vmscan.c:3174
 shrink_node+0x8f6/0x1190 mm/vmscan.c:3295
 shrink_zones+0x2d1/0x5e0 mm/vmscan.c:3532
 do_try_to_free_pages+0x181/0x720 mm/vmscan.c:3590
 try_to_free_mem_cgroup_pages+0x1cb/0x420 mm/vmscan.c:3904
 reclaim_high mm/memcontrol.c:2300 [inline]
 mem_cgroup_handle_over_high+0x15b/0x480 mm/memcontrol.c:2484
 tracehook_notify_resume include/linux/tracehook.h:197 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x139/0x190 kernel/entry/common.c:207
 irqentry_exit_to_user_mode+0x5/0x10 kernel/entry/common.c:313
 irqentry_exit+0xe/0x40 kernel/entry/common.c:404
 asm_exc_page_fault+0x1e/0x30

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 15656 Comm: syz-executor.0 Not tainted 5.17.0-rc4-syzkaller-00241-g7f25f0412c9e-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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