================================================================== BUG: KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 read-write to 0xffffffff868099c0 of 8 bytes by interrupt on cpu 0: tick_do_update_jiffies64+0x113/0x1c0 kernel/time/tick-sched.c:118 tick_sched_do_timer kernel/time/tick-sched.c:232 [inline] tick_nohz_handler+0x7f/0x2d0 kernel/time/tick-sched.c:290 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x20f/0x5a0 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x21a/0x460 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x5f/0x1d0 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 console_flush_all+0x55b/0x730 arch/x86/include/asm/irqflags.h:-1 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xa1/0x330 kernel/printk/printk.c:3325 vprintk_emit+0x388/0x650 kernel/printk/printk.c:2450 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2475 __ext4_error+0x248/0x320 fs/ext4/super.c:813 ext4_validate_block_bitmap+0x557/0x5a0 fs/ext4/balloc.c:-1 ext4_wait_block_bitmap+0xda/0x150 fs/ext4/balloc.c:591 ext4_mb_init_cache+0x2f1/0xb70 fs/ext4/mballoc.c:1352 ext4_mb_init_group+0x25b/0x3f0 fs/ext4/mballoc.c:1543 ext4_mb_load_buddy_gfp+0x72a/0x790 fs/ext4/mballoc.c:1613 ext4_mb_load_buddy fs/ext4/mballoc.c:1733 [inline] ext4_mb_find_by_goal+0x10b/0x720 fs/ext4/mballoc.c:2346 ext4_mb_regular_allocator+0x135/0x2300 fs/ext4/mballoc.c:2818 ext4_mb_new_blocks+0x800/0x2050 fs/ext4/mballoc.c:6215 ext4_ext_map_blocks+0xff5/0x38a0 fs/ext4/extents.c:4383 ext4_map_create_blocks fs/ext4/inode.c:609 [inline] ext4_map_blocks+0x61c/0xd70 fs/ext4/inode.c:813 mpage_map_one_extent fs/ext4/inode.c:2348 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2401 [inline] ext4_do_writepages+0x12d5/0x21c0 fs/ext4/inode.c:2863 ext4_writepages+0x176/0x300 fs/ext4/inode.c:2953 do_writepages+0x1c6/0x310 mm/page-writeback.c:2636 __writeback_single_inode+0x80/0x7c0 fs/fs-writeback.c:1680 writeback_sb_inodes+0x480/0xa20 fs/fs-writeback.c:1976 __writeback_inodes_wb+0x94/0x1a0 fs/fs-writeback.c:2047 wb_writeback+0x266/0x5c0 fs/fs-writeback.c:2158 wb_check_start_all fs/fs-writeback.c:2284 [inline] wb_do_writeback fs/fs-writeback.c:2310 [inline] wb_workfn+0x4c9/0x910 fs/fs-writeback.c:2343 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3321 worker_thread+0x582/0x770 kernel/workqueue.c:3402 kthread+0x486/0x510 kernel/kthread.c:464 ret_from_fork+0xdd/0x150 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 read to 0xffffffff868099c0 of 8 bytes by task 11951 on cpu 1: mem_cgroup_flush_stats_ratelimited+0x29/0x70 mm/memcontrol.c:639 count_shadow_nodes+0x6a/0x230 mm/workingset.c:678 do_shrink_slab+0x60/0x680 mm/shrinker.c:384 shrink_slab_memcg mm/shrinker.c:550 [inline] shrink_slab+0x448/0x760 mm/shrinker.c:628 shrink_node_memcgs mm/vmscan.c:6035 [inline] shrink_node+0x6c3/0x2120 mm/vmscan.c:6074 shrink_zones mm/vmscan.c:6318 [inline] do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6380 try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6708 try_charge_memcg+0x358/0x9e0 mm/memcontrol.c:2362 obj_cgroup_charge_pages+0xa6/0x150 mm/memcontrol.c:2803 __memcg_kmem_charge_page+0x9f/0x170 mm/memcontrol.c:2847 __alloc_frozen_pages_noprof+0x188/0x360 mm/page_alloc.c:4976 alloc_pages_mpol+0xb3/0x250 mm/mempolicy.c:2419 alloc_frozen_pages_noprof mm/mempolicy.c:2490 [inline] alloc_pages_noprof+0x90/0x130 mm/mempolicy.c:2510 vm_area_alloc_pages mm/vmalloc.c:3634 [inline] __vmalloc_area_node mm/vmalloc.c:3712 [inline] __vmalloc_node_range_noprof+0x6f2/0xe00 mm/vmalloc.c:3885 __kvmalloc_node_noprof+0x30f/0x4e0 mm/slub.c:5037 ip_set_alloc+0x1f/0x30 net/netfilter/ipset/ip_set_core.c:261 hash_netiface_create+0x282/0x740 net/netfilter/ipset/ip_set_hash_gen.h:1568 ip_set_create+0x3cc/0x960 net/netfilter/ipset/ip_set_core.c:1109 nfnetlink_rcv_msg+0x4c6/0x590 net/netfilter/nfnetlink.c:303 netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2534 nfnetlink_rcv+0x16b/0x1690 net/netfilter/nfnetlink.c:668 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x5a1/0x670 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x58b/0x6b0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x145/0x180 net/socket.c:727 ____sys_sendmsg+0x31e/0x4e0 net/socket.c:2566 ___sys_sendmsg+0x17b/0x1d0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2655 x64_sys_call+0x2999/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000ffffd8ef -> 0x00000000ffffd8f1 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 11951 Comm: syz.2.2910 Not tainted 6.16.0-rc2-syzkaller-00087-g24770983ccfe #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ==================================================================