================================================================== 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+0x88/0x380 kernel/time/tick-sched.c:310 __run_hrtimer kernel/time/hrtimer.c:2032 [inline] __hrtimer_run_queues+0x1f8/0x510 kernel/time/hrtimer.c:2096 hrtimer_interrupt+0x257/0x810 kernel/time/hrtimer.c:2215 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline] __sysvec_apic_timer_interrupt+0x5f/0x1c0 arch/x86/kernel/apic/apic.c:1068 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 its_return_thunk+0x0/0x10 rcu_preempt_read_exit kernel/rcu/tree_plugin.h:396 [inline] __rcu_read_unlock+0x24/0x70 kernel/rcu/tree_plugin.h:435 rcu_read_unlock include/linux/rcupdate.h:873 [inline] list_lru_count_one+0xc2/0x100 mm/list_lru.c:318 list_lru_shrink_count include/linux/list_lru.h:260 [inline] count_shadow_nodes+0x43/0x250 mm/workingset.c:663 do_shrink_slab+0x61/0x650 mm/shrinker.c:389 shrink_slab_memcg mm/shrinker.c:560 [inline] shrink_slab+0x53b/0x8e0 mm/shrinker.c:638 shrink_node_memcgs mm/vmscan.c:6129 [inline] shrink_node+0x6d9/0x20f0 mm/vmscan.c:6171 shrink_zones mm/vmscan.c:6410 [inline] do_try_to_free_pages+0x408/0xc90 mm/vmscan.c:6472 try_to_free_mem_cgroup_pages+0x201/0x420 mm/vmscan.c:6794 try_charge_memcg+0x375/0xa00 mm/memcontrol.c:2655 obj_cgroup_charge_pages mm/memcontrol.c:3097 [inline] __obj_cgroup_charge+0x105/0x230 mm/memcontrol.c:3478 __memcg_slab_post_alloc_hook+0x492/0x860 mm/memcontrol.c:3607 memcg_slab_post_alloc_hook mm/slub.c:2475 [inline] slab_post_alloc_hook mm/slub.c:4631 [inline] slab_alloc_node mm/slub.c:4945 [inline] kmem_cache_alloc_noprof+0x1f1/0x3c0 mm/slub.c:4959 alloc_buffer_head+0x35/0x1f0 fs/buffer.c:2962 folio_alloc_buffers+0x11b/0x3d0 fs/buffer.c:845 create_empty_buffers+0x2c/0x200 fs/buffer.c:1669 folio_create_buffers fs/buffer.c:1780 [inline] __block_write_begin_int+0x1d4/0xf90 fs/buffer.c:2104 block_page_mkwrite+0x183/0x300 fs/buffer.c:2641 ext4_page_mkwrite+0x824/0xa90 fs/ext4/inode.c:6826 do_page_mkwrite mm/memory.c:3684 [inline] do_shared_fault mm/memory.c:5936 [inline] do_fault mm/memory.c:5998 [inline] do_pte_missing mm/memory.c:4566 [inline] handle_pte_fault mm/memory.c:6379 [inline] __handle_mm_fault mm/memory.c:6517 [inline] handle_mm_fault+0x1b3d/0x2da0 mm/memory.c:6686 do_user_addr_fault+0x402/0x1060 arch/x86/mm/fault.c:1394 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 read to 0xffffffff86c07a00 of 8 bytes by task 23219 on cpu 1: mem_cgroup_flush_stats_ratelimited+0x29/0x50 mm/memcontrol.c:743 count_shadow_nodes+0x6a/0x250 mm/workingset.c:694 do_shrink_slab+0x61/0x650 mm/shrinker.c:389 shrink_slab_memcg mm/shrinker.c:560 [inline] shrink_slab+0x53b/0x8e0 mm/shrinker.c:638 shrink_node_memcgs mm/vmscan.c:6129 [inline] shrink_node+0x6d9/0x20f0 mm/vmscan.c:6171 shrink_zones mm/vmscan.c:6410 [inline] do_try_to_free_pages+0x408/0xc90 mm/vmscan.c:6472 try_to_free_mem_cgroup_pages+0x201/0x420 mm/vmscan.c:6794 try_charge_memcg+0x375/0xa00 mm/memcontrol.c:2655 obj_cgroup_charge_pages mm/memcontrol.c:3097 [inline] __memcg_kmem_charge_page+0x199/0x3a0 mm/memcontrol.c:3141 __alloc_frozen_pages_noprof+0x18a/0x350 mm/page_alloc.c:5321 alloc_pages_mpol+0xa9/0x1d0 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:3742 [inline] __vmalloc_area_node mm/vmalloc.c:3892 [inline] __vmalloc_node_range_noprof+0xae9/0x11e0 mm/vmalloc.c:4082 __kvmalloc_node_noprof+0x3a0/0x590 mm/slub.c:6961 futex_hash_allocate+0x192/0x920 kernel/futex/core.c:1823 futex_hash_prctl+0xd8/0xf0 kernel/futex/core.c:1995 __do_sys_prctl kernel/sys.c:2885 [inline] __se_sys_prctl+0x4f4/0x13b0 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+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x000000010001c8d3 -> 0x000000010001c8d4 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 23219 Comm: syz.0.4807 Tainted: G W syzkaller #0 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 ================================================================== syz.0.4807 invoked oom-killer: gfp_mask=0x402dc2(GFP_KERNEL_ACCOUNT|__GFP_HIGHMEM|__GFP_ZERO|__GFP_NOWARN), order=0, oom_score_adj=0 CPU: 1 UID: 0 PID: 23219 Comm: syz.0.4807 Tainted: G W syzkaller #0 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: __dump_stack+0x1d/0x30 lib/dump_stack.c:94 dump_stack_lvl+0x95/0xd0 lib/dump_stack.c:120 dump_stack+0x15/0x1b lib/dump_stack.c:129 dump_header+0x80/0x240 mm/oom_kill.c:464 oom_kill_process+0x295/0x350 mm/oom_kill.c:1031 out_of_memory+0x981/0xbc0 mm/oom_kill.c:1169 mem_cgroup_out_of_memory mm/memcontrol.c:1907 [inline] mem_cgroup_oom mm/memcontrol.c:1930 [inline] try_charge_memcg+0x621/0xa00 mm/memcontrol.c:2697 obj_cgroup_charge_pages mm/memcontrol.c:3097 [inline] __memcg_kmem_charge_page+0x199/0x3a0 mm/memcontrol.c:3141 __alloc_frozen_pages_noprof+0x18a/0x350 mm/page_alloc.c:5321 alloc_pages_mpol+0xa9/0x1d0 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:3742 [inline] __vmalloc_area_node mm/vmalloc.c:3892 [inline] __vmalloc_node_range_noprof+0xae9/0x11e0 mm/vmalloc.c:4082 __kvmalloc_node_noprof+0x3a0/0x590 mm/slub.c:6961 futex_hash_allocate+0x192/0x920 kernel/futex/core.c:1823 futex_hash_prctl+0xd8/0xf0 kernel/futex/core.c:1995 __do_sys_prctl kernel/sys.c:2885 [inline] __se_sys_prctl+0x4f4/0x13b0 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+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f456e46de59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f456ca62028 EFLAGS: 00000246 ORIG_RAX: 000000000000009d RAX: ffffffffffffffda RBX: 00007f456e6f6270 RCX: 00007f456e46de59 RDX: 0000000001000000 RSI: 0000000000000001 RDI: 000000000000004e RBP: 00007f456e503e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f456e6f6308 R14: 00007f456e6f6270 R15: 00007ffd0439e5f8 memory: usage 307200kB, limit 307200kB, failcnt 6663 memory+swap: usage 289588kB, limit 9007199254740988kB, failcnt 0 kmem: usage 192404kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz0: cache 27693056 rss 1732608 shmem 27688960 mapped_file 4202496 dirty 4096 writeback 0 workingset_refault_anon 620 workingset_refault_file 7681 swap 65564672 swapcached 80928768 pgpgin 1201839 pgpgout 1194649 pgfault 1288146 pgmajfault 1396 inactive_anon 28803072 active_anon 643072 inactive_file 0 active_file 4096 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 31883264 total_rss 1732608 total_shmem 31879168 total_mapped_file 4202496 total_dirty 4096 total_writeback 0 total_workingset_refault_anon 620 total_workingset_refault_file 7722 total_swap 65564672 total_swapcached 80928768 total_pgpgin 1203132 total_pgpgout 1194919 total_pgfault 1289259 total_pgmajfault 1396 total_inactive_anon 32993280 total_active_anon 643072 total_inactive_file 0 total_active_file 4096 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz0,task_memcg=/syz0,task=syz.0.2210,pid=12483,uid=0 Memory cgroup out of memory: Killed process 12483 (syz.0.2210) total-vm:96228kB, anon-rss:1444kB, file-rss:20484kB, shmem-rss:0kB, UID:0 pgtables:100kB oom_score_adj:1000