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BUG: KCSAN: data-race in list_lru_count_one / list_lru_isolate

read to 0xffff8880b1ed33f0 of 8 bytes by task 20665 on cpu 1:
 list_lru_count_one+0xbd/0x130 mm/list_lru.c:193
 list_lru_shrink_count include/linux/list_lru.h:123 [inline]
 super_cache_count+0xde/0x1b0 fs/super.c:147
 do_shrink_slab+0xb7/0x5a0 mm/vmscan.c:479
 shrink_slab_memcg mm/vmscan.c:631 [inline]
 shrink_slab+0x46e/0x540 mm/vmscan.c:710
 shrink_node+0x1ad/0xb30 mm/vmscan.c:2811
 shrink_zones mm/vmscan.c:3025 [inline]
 do_try_to_free_pages+0x242/0x940 mm/vmscan.c:3083
 try_to_free_mem_cgroup_pages+0x1fd/0x4c0 mm/vmscan.c:3383
 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+0x20f/0x220 arch/x86/entry/common.c:274
 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:344

write to 0xffff8880b1ed33f0 of 8 bytes by task 20661 on cpu 0:
 list_lru_isolate+0x9b/0x120 mm/list_lru.c:172
 d_lru_isolate fs/dcache.c:446 [inline]
 dentry_lru_isolate+0x180/0x1a0 fs/dcache.c:1145
 __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:561
 shrink_slab_memcg mm/vmscan.c:631 [inline]
 shrink_slab+0x46e/0x540 mm/vmscan.c:710
 shrink_node+0x1ad/0xb30 mm/vmscan.c:2811
 shrink_zones mm/vmscan.c:3025 [inline]
 do_try_to_free_pages+0x242/0x940 mm/vmscan.c:3083
 try_to_free_mem_cgroup_pages+0x1fd/0x4c0 mm/vmscan.c:3383
 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
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 20661 Comm: syz-executor.4 Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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