================================================================== BUG: KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 read-write to 0xffffffff86a09a00 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:253 [inline] tick_nohz_handler+0x8d/0x3d0 kernel/time/tick-sched.c:312 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x20f/0x590 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x269/0x810 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x5f/0x1d0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 kcsan_setup_watchpoint+0x404/0x410 kernel/kcsan/core.c:705 sg_unmark_end include/linux/scatterlist.h:295 [inline] blk_next_sg block/blk-mq-dma.c:282 [inline] __blk_rq_map_sg+0x186/0x390 block/blk-mq-dma.c:299 scsi_alloc_sgtables+0x1b0/0x550 drivers/scsi/scsi_lib.c:1160 sd_setup_read_write_cmnd drivers/scsi/sd.c:1366 [inline] sd_init_command+0x2c0/0xe00 drivers/scsi/sd.c:1488 scsi_prepare_cmd drivers/scsi/scsi_lib.c:1728 [inline] scsi_queue_rq+0xcdf/0x1a70 drivers/scsi/scsi_lib.c:1876 blk_mq_dispatch_rq_list+0x2bc/0xf70 block/blk-mq.c:2138 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline] blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline] __blk_mq_sched_dispatch_requests+0x7f0/0xc70 block/blk-mq-sched.c:307 blk_mq_sched_dispatch_requests+0x86/0x120 block/blk-mq-sched.c:329 blk_mq_run_hw_queue+0x17e/0x220 block/blk-mq.c:2376 blk_mq_dispatch_list+0x842/0xa10 arch/x86/include/asm/bitops.h:-1 blk_mq_flush_plug_list+0x2ca/0x320 block/blk-mq.c:2987 blk_add_rq_to_plug+0xe3/0x390 block/blk-mq.c:1408 blk_mq_submit_bio+0xc30/0x1110 block/blk-mq.c:3233 __submit_bio+0x103/0x4f0 block/blk-core.c:637 __submit_bio_noacct_mq block/blk-core.c:724 [inline] submit_bio_noacct_nocheck+0x152/0x630 block/blk-core.c:755 submit_bio_noacct+0x746/0x9a0 block/blk-core.c:879 submit_bio+0x2a4/0x2c0 block/blk-core.c:921 ext4_io_submit+0x8c/0xb0 fs/ext4/page-io.c:404 ext4_do_writepages+0x717/0x2800 fs/ext4/inode.c:2882 ext4_writepages+0x18f/0x320 fs/ext4/inode.c:3026 do_writepages+0x1c6/0x310 mm/page-writeback.c:2598 __writeback_single_inode+0x80/0x7b0 fs/fs-writeback.c:1737 writeback_sb_inodes+0x4f4/0xb70 fs/fs-writeback.c:2030 __writeback_inodes_wb+0x94/0x1a0 fs/fs-writeback.c:2107 wb_writeback+0x261/0x5b0 fs/fs-writeback.c:2218 wb_check_start_all fs/fs-writeback.c:2344 [inline] wb_do_writeback fs/fs-writeback.c:2370 [inline] wb_workfn+0x4ed/0x960 fs/fs-writeback.c:2403 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0x4cd/0x9d0 kernel/workqueue.c:3340 worker_thread+0x6bc/0x8b0 kernel/workqueue.c:3421 kthread+0x488/0x510 kernel/kthread.c:463 ret_from_fork+0x148/0x280 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 read to 0xffffffff86a09a00 of 8 bytes by task 2612 on cpu 1: mem_cgroup_flush_stats_ratelimited+0x29/0x70 mm/memcontrol.c:636 count_shadow_nodes+0x6a/0x230 mm/workingset.c:678 do_shrink_slab+0x63/0x670 mm/shrinker.c:384 shrink_slab_memcg mm/shrinker.c:550 [inline] shrink_slab+0x538/0x880 mm/shrinker.c:628 shrink_node_memcgs mm/vmscan.c:6022 [inline] shrink_node+0x6cb/0x2000 mm/vmscan.c:6061 shrink_zones mm/vmscan.c:6300 [inline] do_try_to_free_pages+0x404/0xcc0 mm/vmscan.c:6362 try_to_free_mem_cgroup_pages+0x222/0x470 mm/vmscan.c:6690 try_charge_memcg+0x37e/0xa10 mm/memcontrol.c:2388 obj_cgroup_charge_pages+0x23/0xc0 mm/memcontrol.c:2823 __memcg_kmem_charge_page+0x9e/0x170 mm/memcontrol.c:2867 __alloc_frozen_pages_noprof+0x18a/0x350 mm/page_alloc.c:5257 alloc_pages_mpol+0xb3/0x260 mm/mempolicy.c:2486 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline] alloc_pages_noprof+0x8f/0x130 mm/mempolicy.c:2577 vm_area_alloc_pages mm/vmalloc.c:3718 [inline] __vmalloc_area_node mm/vmalloc.c:3863 [inline] __vmalloc_node_range_noprof+0xa46/0x12b0 mm/vmalloc.c:4051 __kvmalloc_node_noprof+0x471/0x680 mm/slub.c:7172 ip_set_alloc+0x24/0x30 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+0x3cf/0x970 net/netfilter/ipset/ip_set_core.c:1109 nfnetlink_rcv_msg+0x509/0x5d0 net/netfilter/nfnetlink.c:302 netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2550 nfnetlink_rcv+0x167/0x1720 net/netfilter/nfnetlink.c:669 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x5c0/0x690 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x5c8/0x6f0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0x5af/0x600 net/socket.c:2592 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2681 x64_sys_call+0x17ba/0x3000 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc0/0x2a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000001000149df -> 0x00000001000149e0 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 2612 Comm: syz.6.22748 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 ==================================================================