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BUG: KCSAN: data-race in mem_cgroup_iter / mem_cgroup_iter

read to 0xffff8881158b3668 of 4 bytes by task 3265 on cpu 0:
 mem_cgroup_iter+0x93/0x380 mm/memcontrol.c:1019
 shrink_node_memcgs mm/vmscan.c:5904 [inline]
 shrink_node+0x74a/0x1d40 mm/vmscan.c:5928
 shrink_zones mm/vmscan.c:6172 [inline]
 do_try_to_free_pages+0x3c6/0xc50 mm/vmscan.c:6234
 try_to_free_mem_cgroup_pages+0x1f3/0x4f0 mm/vmscan.c:6566
 try_charge_memcg+0x2bc/0x810 mm/memcontrol.c:2210
 try_charge mm/memcontrol-v1.h:20 [inline]
 charge_memcg mm/memcontrol.c:4438 [inline]
 mem_cgroup_swapin_charge_folio+0x107/0x1a0 mm/memcontrol.c:4523
 __read_swap_cache_async+0x2b7/0x520 mm/swap_state.c:516
 swap_cluster_readahead+0x276/0x3f0 mm/swap_state.c:680
 swapin_readahead+0xe4/0x760 mm/swap_state.c:882
 do_swap_page+0x3da/0x1ef0 mm/memory.c:4119
 handle_pte_fault mm/memory.c:5524 [inline]
 __handle_mm_fault mm/memory.c:5664 [inline]
 handle_mm_fault+0x8cb/0x2a30 mm/memory.c:5832
 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x3b9/0x650 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

read-write to 0xffff8881158b3668 of 4 bytes by task 3946 on cpu 1:
 mem_cgroup_iter+0x28e/0x380 mm/memcontrol.c:1080
 shrink_node_memcgs mm/vmscan.c:5904 [inline]
 shrink_node+0x74a/0x1d40 mm/vmscan.c:5928
 shrink_zones mm/vmscan.c:6172 [inline]
 do_try_to_free_pages+0x3c6/0xc50 mm/vmscan.c:6234
 try_to_free_mem_cgroup_pages+0x1f3/0x4f0 mm/vmscan.c:6566
 try_charge_memcg+0x2bc/0x810 mm/memcontrol.c:2210
 try_charge mm/memcontrol-v1.h:20 [inline]
 charge_memcg mm/memcontrol.c:4438 [inline]
 mem_cgroup_swapin_charge_folio+0x107/0x1a0 mm/memcontrol.c:4523
 __read_swap_cache_async+0x2b7/0x520 mm/swap_state.c:516
 swap_cluster_readahead+0x276/0x3f0 mm/swap_state.c:680
 swapin_readahead+0xe4/0x760 mm/swap_state.c:882
 do_swap_page+0x3da/0x1ef0 mm/memory.c:4119
 handle_pte_fault mm/memory.c:5524 [inline]
 __handle_mm_fault mm/memory.c:5664 [inline]
 handle_mm_fault+0x8cb/0x2a30 mm/memory.c:5832
 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x3b9/0x650 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0x00000147 -> 0x0000014a

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3946 Comm: syz.2.161 Not tainted 6.11.0-rc6-syzkaller-00048-gc7fb1692dc01 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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syz.2.161 (3946) used greatest stack depth: 10152 bytes left