================================================================== 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 1: 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 should_watch kernel/kcsan/core.c:280 [inline] check_access kernel/kcsan/core.c:752 [inline] __tsan_unaligned_write8+0x14c/0x180 kernel/kcsan/core.c:1025 __copy_msghdr net/socket.c:2597 [inline] copy_msghdr_from_user net/socket.c:2631 [inline] recvmsg_copy_msghdr net/socket.c:2884 [inline] ___sys_recvmsg+0x2b5/0x3b0 net/socket.c:2956 do_recvmmsg+0x1ef/0x560 net/socket.c:3055 __sys_recvmmsg net/socket.c:3129 [inline] __do_sys_recvmmsg net/socket.c:3152 [inline] __se_sys_recvmmsg net/socket.c:3145 [inline] __x64_sys_recvmmsg+0xe5/0x170 net/socket.c:3145 x64_sys_call+0x80f/0x3020 arch/x86/include/generated/asm/syscalls_64.h:300 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 12180 on cpu 0: 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: 0x00000001000001ab -> 0x00000001000001ac Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 12180 Comm: syz.5.2759 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 ================================================================== syz.5.2759 invoked oom-killer: gfp_mask=0x402dc2(GFP_KERNEL_ACCOUNT|__GFP_HIGHMEM|__GFP_ZERO|__GFP_NOWARN), order=0, oom_score_adj=0 CPU: 0 UID: 0 PID: 12180 Comm: syz.5.2759 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 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+0x97d/0xb80 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+0x62f/0xa10 mm/memcontrol.c:2669 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 RIP: 0033:0x7fa81216ce59 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:00007fa810bbf028 EFLAGS: 00000246 ORIG_RAX: 000000000000009d RAX: ffffffffffffffda RBX: 00007fa8123e5fa0 RCX: 00007fa81216ce59 RDX: 0000000001000000 RSI: 0000000000000001 RDI: 000000000000004e RBP: 00007fa812202d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa8123e6038 R14: 00007fa8123e5fa0 R15: 00007ffc00ee6428 memory: usage 307200kB, limit 307200kB, failcnt 646 memory+swap: usage 322232kB, limit 9007199254740988kB, failcnt 0 kmem: usage 253736kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz5: cache 54091776 rss 618496 shmem 54050816 mapped_file 0 dirty 0 writeback 0 workingset_refault_anon 478 workingset_refault_file 171 swap 15392768 swapcached 26607616 pgpgin 288785 pgpgout 275419 pgfault 313165 pgmajfault 62 inactive_anon 950272 active_anon 53755904 inactive_file 0 active_file 0 unevictable 40960 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 54091776 total_rss 618496 total_shmem 54050816 total_mapped_file 0 total_dirty 0 total_writeback 0 total_workingset_refault_anon 478 total_workingset_refault_file 171 total_swap 15392768 total_swapcached 26607616 total_pgpgin 288785 total_pgpgout 275419 total_pgfault 313165 total_pgmajfault 62 total_inactive_anon 950272 total_active_anon 53755904 total_inactive_file 0 total_active_file 0 total_unevictable 40960 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz5,task_memcg=/syz5,task=syz.5.2759,pid=12179,uid=0 Memory cgroup out of memory: Killed process 12179 (syz.5.2759) total-vm:96216kB, anon-rss:1416kB, file-rss:22380kB, shmem-rss:0kB, UID:0 pgtables:128kB oom_score_adj:0