==================================================================
BUG: KCSAN: data-race in mem_cgroup_iter / mem_cgroup_iter

read to 0xffff8881159a3e68 of 4 bytes by task 7369 on cpu 1:
 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 0xffff8881159a3e68 of 4 bytes by task 8654 on cpu 0:
 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+0x37e/0x3f0 mm/swap_state.c:699
 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:1389 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x296/0x650 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
 __get_user_8+0x11/0x20 arch/x86/lib/getuser.S:94
 fetch_robust_entry kernel/futex/core.c:783 [inline]
 exit_robust_list+0x31/0x280 kernel/futex/core.c:811
 futex_cleanup kernel/futex/core.c:1043 [inline]
 futex_exit_release+0xe3/0x130 kernel/futex/core.c:1144
 exit_mm_release+0x1a/0x30 kernel/fork.c:1637
 exit_mm+0x38/0x190 kernel/exit.c:544
 do_exit+0x55e/0x1720 kernel/exit.c:869
 do_group_exit+0x102/0x150 kernel/exit.c:1031
 get_signal+0xf2f/0x1080 kernel/signal.c:2917
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x59/0x130 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x000012c6 -> 0x000012c7

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 8654 Comm: syz.1.1056 Not tainted 6.11.0-rc7-syzkaller-00017-gbc83b4d1f086 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
==================================================================