================================================================== BUG: KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 read-write to 0xffffffff86e07a00 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 kcsan_setup_watchpoint+0x404/0x410 kernel/kcsan/core.c:705 pte_offset_map_rw_nolock+0x19e/0x200 mm/pgtable-generic.c:332 handle_pte_fault mm/memory.c:6396 [inline] __handle_mm_fault mm/memory.c:6549 [inline] handle_mm_fault+0x711/0x2e70 mm/memory.c:6718 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x1290/0x1f10 mm/gup.c:1428 populate_vma_page_range mm/gup.c:1860 [inline] __mm_populate+0x242/0x390 mm/gup.c:1963 mm_populate include/linux/mm.h:4137 [inline] vm_mmap_pgoff+0x23b/0x2d0 mm/util.c:586 ksys_mmap_pgoff+0xc1/0x310 mm/mmap.c:606 x64_sys_call+0x14df/0x3020 arch/x86/include/generated/asm/syscalls_64.h:10 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 0xffffffff86e07a00 of 8 bytes by task 1747 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:2618 charge_memcg+0x6d/0x120 mm/memcontrol.c:5006 __mem_cgroup_charge+0x28/0xb0 mm/memcontrol.c:5023 mem_cgroup_charge include/linux/memcontrol.h:644 [inline] shmem_alloc_and_add_folio mm/shmem.c:1985 [inline] shmem_get_folio_gfp+0x47b/0xd60 mm/shmem.c:2564 shmem_fault+0xf6/0x250 mm/shmem.c:2765 __do_fault mm/memory.c:5458 [inline] do_read_fault mm/memory.c:5893 [inline] do_fault mm/memory.c:6027 [inline] do_pte_missing mm/memory.c:4550 [inline] handle_pte_fault mm/memory.c:6411 [inline] __handle_mm_fault mm/memory.c:6549 [inline] handle_mm_fault+0x16cb/0x2e70 mm/memory.c:6718 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x1290/0x1f10 mm/gup.c:1428 populate_vma_page_range mm/gup.c:1860 [inline] __mm_populate+0x242/0x390 mm/gup.c:1963 mm_populate include/linux/mm.h:4137 [inline] vm_mmap_pgoff+0x23b/0x2d0 mm/util.c:586 ksys_mmap_pgoff+0xc1/0x310 mm/mmap.c:606 x64_sys_call+0x14df/0x3020 arch/x86/include/generated/asm/syscalls_64.h:10 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: 0x000000010001e437 -> 0x000000010001e438 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 1747 Comm: syz.6.23369 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.6.23369 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=0 CPU: 1 UID: 0 PID: 1747 Comm: syz.6.23369 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:1898 [inline] mem_cgroup_oom mm/memcontrol.c:1921 [inline] try_charge_memcg+0x62f/0xa10 mm/memcontrol.c:2660 charge_memcg+0x6d/0x120 mm/memcontrol.c:5006 __mem_cgroup_charge+0x28/0xb0 mm/memcontrol.c:5023 mem_cgroup_charge include/linux/memcontrol.h:644 [inline] shmem_alloc_and_add_folio mm/shmem.c:1985 [inline] shmem_get_folio_gfp+0x47b/0xd60 mm/shmem.c:2564 shmem_fault+0xf6/0x250 mm/shmem.c:2765 __do_fault mm/memory.c:5458 [inline] do_read_fault mm/memory.c:5893 [inline] do_fault mm/memory.c:6027 [inline] do_pte_missing mm/memory.c:4550 [inline] handle_pte_fault mm/memory.c:6411 [inline] __handle_mm_fault mm/memory.c:6549 [inline] handle_mm_fault+0x16cb/0x2e70 mm/memory.c:6718 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x1290/0x1f10 mm/gup.c:1428 populate_vma_page_range mm/gup.c:1860 [inline] __mm_populate+0x242/0x390 mm/gup.c:1963 mm_populate include/linux/mm.h:4137 [inline] vm_mmap_pgoff+0x23b/0x2d0 mm/util.c:586 ksys_mmap_pgoff+0xc1/0x310 mm/mmap.c:606 x64_sys_call+0x14df/0x3020 arch/x86/include/generated/asm/syscalls_64.h:10 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: 0033:0x7f8f8562cdd9 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:00007f8f8407f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f8f858a5fa0 RCX: 00007f8f8562cdd9 RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000 RBP: 00007f8f856c2d69 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8f858a6038 R14: 00007f8f858a5fa0 R15: 00007ffedafbb778 memory: usage 307200kB, limit 307200kB, failcnt 16233 memory+swap: usage 339848kB, limit 9007199254740988kB, failcnt 0 kmem: usage 260300kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz6: cache 43331584 rss 4694016 shmem 43331584 mapped_file 7053312 dirty 0 writeback 0 workingset_refault_anon 5251 workingset_refault_file 4873 swap 33431552 swapcached 70414336 pgpgin 3239663 pgpgout 3227938 pgfault 3319082 pgmajfault 671 inactive_anon 11595776 active_anon 36429824 inactive_file 0 active_file 0 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 43331584 total_rss 4694016 total_shmem 43331584 total_mapped_file 7053312 total_dirty 0 total_writeback 0 total_workingset_refault_anon 5251 total_workingset_refault_file 4873 total_swap 33431552 total_swapcached 70414336 total_pgpgin 3239663 total_pgpgout 3227938 total_pgfault 3319082 total_pgmajfault 671 total_inactive_anon 11595776 total_active_anon 36429824 total_inactive_file 0 total_active_file 0 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=syz6,mems_allowed=0,oom_memcg=/syz6,task_memcg=/syz6,task=syz.6.1113,pid=7739,uid=0 Memory cgroup out of memory: Killed process 7739 (syz.6.1113) total-vm:96084kB, anon-rss:1232kB, file-rss:20804kB, shmem-rss:0kB, UID:0 pgtables:84kB oom_score_adj:1000