syzbot

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BUG: KCSAN: data-race in __refill_stock / drain_all_stock

read-write to 0xffff888237d2b950 of 4 bytes by task 13682 on cpu 1:
 __refill_stock+0x8a/0xc0 mm/memcontrol.c:2390
 refill_stock mm/memcontrol.c:2401 [inline]
 obj_cgroup_uncharge_pages+0x126/0x200 mm/memcontrol.c:3281
 __memcg_kmem_uncharge_page+0x53/0x110 mm/memcontrol.c:3354
 memcg_kmem_uncharge_page include/linux/memcontrol.h:1853 [inline]
 exit_task_stack_account+0x21e/0x2d0 kernel/fork.c:562
 do_exit+0x10bf/0x1740 kernel/exit.c:919
 do_group_exit+0x142/0x150 kernel/exit.c:1027
 __do_sys_exit_group kernel/exit.c:1038 [inline]
 __se_sys_exit_group kernel/exit.c:1036 [inline]
 __x64_sys_exit_group+0x1f/0x20 kernel/exit.c:1036
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x72/0x7a

read to 0xffff888237d2b950 of 4 bytes by task 13702 on cpu 0:
 drain_all_stock+0xd3/0x2e0 mm/memcontrol.c:2431
 try_charge_memcg+0x6bb/0xd10 mm/memcontrol.c:2791
 obj_cgroup_charge_pages+0xbd/0x1d0 mm/memcontrol.c:3302
 __memcg_kmem_charge_page+0x9d/0x170 mm/memcontrol.c:3328
 __alloc_pages+0x1bc/0x360 mm/page_alloc.c:4592
 alloc_pages_mpol+0xb1/0x1e0 mm/mempolicy.c:2264
 alloc_pages+0xe1/0x100 mm/mempolicy.c:2335
 vm_area_alloc_pages mm/vmalloc.c:3545 [inline]
 __vmalloc_area_node mm/vmalloc.c:3621 [inline]
 __vmalloc_node_range+0x6f2/0xee0 mm/vmalloc.c:3802
 kvmalloc_node+0x121/0x170 mm/util.c:659
 kvmalloc include/linux/slab.h:766 [inline]
 xt_alloc_table_info+0x3d/0x80 net/netfilter/x_tables.c:1193
 do_replace net/ipv6/netfilter/ip6_tables.c:1139 [inline]
 do_ip6t_set_ctl+0x63f/0x1800 net/ipv6/netfilter/ip6_tables.c:1636
 nf_setsockopt+0x195/0x1b0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x126/0x140 net/ipv6/ipv6_sockglue.c:999
 udpv6_setsockopt+0x95/0xb0 net/ipv6/udp.c:1692
 sock_common_setsockopt+0x64/0x80 net/core/sock.c:3727
 do_sock_setsockopt net/socket.c:2311 [inline]
 __sys_setsockopt+0x1d8/0x250 net/socket.c:2334
 __do_sys_setsockopt net/socket.c:2343 [inline]
 __se_sys_setsockopt net/socket.c:2340 [inline]
 __x64_sys_setsockopt+0x66/0x80 net/socket.c:2340
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x72/0x7a

value changed: 0x00000002 -> 0x00000005

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13702 Comm: syz-executor.1 Tainted: G        W          6.9.0-rc1-syzkaller-00355-g712e14250dd2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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