================================================================== BUG: KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 read-write to 0xffffffff86c07a00 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:1930 [inline] __hrtimer_run_queues+0x276/0x4f0 kernel/time/hrtimer.c:1994 hrtimer_interrupt+0x261/0x850 kernel/time/hrtimer.c:2113 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] __sysvec_apic_timer_interrupt+0x5f/0x1c0 arch/x86/kernel/apic/apic.c:1067 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 console_flush_one_record arch/x86/include/asm/irqflags.h:-1 [inline] console_flush_all+0x540/0x6c0 kernel/printk/printk.c:3343 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0xa1/0x280 kernel/printk/printk.c:3413 vprintk_emit+0x3e4/0x600 kernel/printk/printk.c:2479 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2504 __ext4_msg+0x1aa/0x1c0 fs/ext4/super.c:1001 ext4_handle_error+0x50a/0x550 fs/ext4/super.c:741 __ext4_error_inode+0x1bb/0x3c0 fs/ext4/super.c:871 __ext4_iget+0x8a2/0x23f0 fs/ext4/inode.c:5280 ext4_xattr_inode_iget+0xa6/0x200 fs/ext4/xattr.c:441 ext4_xattr_set_entry+0x572/0x1010 fs/ext4/xattr.c:1716 ext4_xattr_ibody_set+0x184/0x3c0 fs/ext4/xattr.c:2275 ext4_xattr_move_to_block fs/ext4/xattr.c:2678 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2746 [inline] ext4_expand_extra_isize_ea+0xd7b/0x11a0 fs/ext4/xattr.c:2834 __ext4_expand_extra_isize+0x246/0x280 fs/ext4/inode.c:6434 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6477 [inline] __ext4_mark_inode_dirty+0x29b/0x3d0 fs/ext4/inode.c:6555 ext4_evict_inode+0x8ba/0xe30 fs/ext4/inode.c:267 evict+0x2af/0x510 fs/inode.c:841 iput_final fs/inode.c:1960 [inline] iput+0x41a/0x580 fs/inode.c:2009 ext4_process_orphan+0x1a9/0x1c0 fs/ext4/orphan.c:358 ext4_orphan_cleanup+0x69c/0x9f0 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5701 [inline] ext4_fill_super+0x3408/0x37c0 fs/ext4/super.c:5824 get_tree_bdev_flags+0x291/0x300 fs/super.c:1694 get_tree_bdev+0x1f/0x30 fs/super.c:1717 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5856 vfs_get_tree+0x57/0x1d0 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3758 [inline] do_new_mount+0x288/0x8d0 fs/namespace.c:3834 path_mount+0x4d0/0xbc0 fs/namespace.c:4154 do_mount fs/namespace.c:4167 [inline] __do_sys_mount fs/namespace.c:4383 [inline] __se_sys_mount+0x28c/0x2e0 fs/namespace.c:4360 __x64_sys_mount+0x67/0x80 fs/namespace.c:4360 x64_sys_call+0x2d61/0x3020 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff86c07a00 of 8 bytes by task 13604 on cpu 1: mem_cgroup_flush_stats_ratelimited+0x29/0x50 mm/memcontrol.c:743 count_shadow_nodes+0x6a/0x250 mm/workingset.c:692 do_shrink_slab+0x63/0x660 mm/shrinker.c:382 shrink_slab_memcg mm/shrinker.c:553 [inline] shrink_slab+0x545/0x8f0 mm/shrinker.c:631 shrink_node_memcgs mm/vmscan.c:6173 [inline] shrink_node+0x6d4/0x20a0 mm/vmscan.c:6215 shrink_zones mm/vmscan.c:6454 [inline] do_try_to_free_pages+0x408/0xc90 mm/vmscan.c:6516 try_to_free_mem_cgroup_pages+0x201/0x420 mm/vmscan.c:6838 try_charge_memcg+0x373/0xa10 mm/memcontrol.c:2627 obj_cgroup_charge_pages mm/memcontrol.c:3069 [inline] __memcg_kmem_charge_page+0x1ce/0x3d0 mm/memcontrol.c:3113 __alloc_frozen_pages_noprof+0x18a/0x350 mm/page_alloc.c:5243 alloc_pages_mpol+0xb3/0x260 mm/mempolicy.c:2490 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline] alloc_pages_noprof+0x8f/0x140 mm/mempolicy.c:2581 vm_area_alloc_pages mm/vmalloc.c:3728 [inline] __vmalloc_area_node mm/vmalloc.c:3878 [inline] __vmalloc_node_range_noprof+0xaed/0x11c0 mm/vmalloc.c:4064 __kvmalloc_node_noprof+0x3d4/0x640 mm/slub.c:6860 futex_hash_allocate+0x190/0x9a0 kernel/futex/core.c:1815 futex_hash_prctl+0xd8/0xf0 kernel/futex/core.c:1961 __do_sys_prctl kernel/sys.c:2885 [inline] __se_sys_prctl+0x4f4/0x1400 kernel/sys.c:2534 __x64_sys_prctl+0x67/0x80 kernel/sys.c:2534 x64_sys_call+0x2533/0x3020 arch/x86/include/generated/asm/syscalls_64.h:158 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x000000010000284f -> 0x0000000100002850 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 13604 Comm: syz.0.2676 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 ==================================================================