syzbot

==================================================================
BUG: KCSAN: data-race in __dentry_kill / d_lru_shrink_move

write to 0xffff888125a30480 of 4 bytes by task 27540 on cpu 0:
 d_lru_shrink_move+0x5c/0xc0 fs/dcache.c:453
 dentry_lru_isolate+0xb0/0x1a0 fs/dcache.c:1176
 __list_lru_walk_one+0x110/0x390 mm/list_lru.c:232
 list_lru_walk_one+0x84/0xb0 mm/list_lru.c:276
 list_lru_shrink_walk include/linux/list_lru.h:195 [inline]
 prune_dcache_sb+0x8a/0xc0 fs/dcache.c:1199
 super_cache_scan+0x1d1/0x2c0 fs/super.c:105
 do_shrink_slab+0x2b6/0x5a0 mm/vmscan.c:560
 shrink_slab_memcg mm/vmscan.c:630 [inline]
 shrink_slab+0x46e/0x540 mm/vmscan.c:709
 shrink_node+0x1ad/0xb30 mm/vmscan.c:2813
 shrink_zones mm/vmscan.c:3027 [inline]
 do_try_to_free_pages+0x242/0x940 mm/vmscan.c:3085
 try_to_free_mem_cgroup_pages+0x1fd/0x4c0 mm/vmscan.c:3385
 reclaim_high.constprop.0+0xf7/0x140 mm/memcontrol.c:2349
 mem_cgroup_handle_over_high+0x96/0x180 mm/memcontrol.c:2430
 tracehook_notify_resume include/linux/tracehook.h:197 [inline]
 exit_to_usermode_loop+0x20c/0x2c0 arch/x86/entry/common.c:163

read to 0xffff888125a30480 of 4 bytes by task 7348 on cpu 1:
 dentry_unlist fs/dcache.c:544 [inline]
 __dentry_kill+0x1be/0x3c0 fs/dcache.c:575
 shrink_dentry_list+0x10e/0x1c0 fs/dcache.c:1120
 prune_dcache_sb+0x96/0xc0 fs/dcache.c:1201
 super_cache_scan+0x1d1/0x2c0 fs/super.c:105
 do_shrink_slab+0x2b6/0x5a0 mm/vmscan.c:560
 shrink_slab_memcg mm/vmscan.c:630 [inline]
 shrink_slab+0x46e/0x540 mm/vmscan.c:709
 shrink_node+0x1ad/0xb30 mm/vmscan.c:2813
 shrink_zones mm/vmscan.c:3027 [inline]
 do_try_to_free_pages+0x242/0x940 mm/vmscan.c:3085
 try_to_free_mem_cgroup_pages+0x1fd/0x4c0 mm/vmscan.c:3385
 reclaim_high.constprop.0+0xf7/0x140 mm/memcontrol.c:2349
 mem_cgroup_handle_over_high+0x96/0x180 mm/memcontrol.c:2430
 tracehook_notify_resume include/linux/tracehook.h:197 [inline]
 exit_to_usermode_loop+0x20c/0x2c0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x353/0x370 arch/x86/entry/common.c:300

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7348 Comm: syz-executor.2 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================