================================================================== 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+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 check_kcov_mode kernel/kcov.c:185 [inline] write_comp_data kernel/kcov.c:246 [inline] __sanitizer_cov_trace_const_cmp8+0x36/0x90 kernel/kcov.c:321 ____sys_recvmsg+0x1b5/0x280 net/socket.c:2919 ___sys_recvmsg+0x11f/0x3a0 net/socket.c:2946 do_recvmmsg+0x1e5/0x560 net/socket.c:3041 __sys_recvmmsg net/socket.c:3115 [inline] __do_sys_recvmmsg net/socket.c:3138 [inline] __se_sys_recvmmsg net/socket.c:3131 [inline] __x64_sys_recvmmsg+0xe5/0x170 net/socket.c:3131 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+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff86c07a00 of 8 bytes by task 3299 on cpu 0: 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:6126 [inline] shrink_node+0x6d9/0x20f0 mm/vmscan.c:6168 shrink_zones mm/vmscan.c:6407 [inline] do_try_to_free_pages+0x408/0xc90 mm/vmscan.c:6469 try_to_free_mem_cgroup_pages+0x201/0x420 mm/vmscan.c:6791 try_charge_memcg+0x375/0xa00 mm/memcontrol.c:2655 charge_memcg+0x6d/0x120 mm/memcontrol.c:5126 __mem_cgroup_charge+0x28/0xb0 mm/memcontrol.c:5143 mem_cgroup_charge include/linux/memcontrol.h:657 [inline] filemap_add_folio+0x110/0x350 mm/filemap.c:959 page_cache_ra_unbounded+0x1a4/0x3a0 mm/readahead.c:293 do_page_cache_ra mm/readahead.c:348 [inline] page_cache_ra_order+0x149/0x210 mm/readahead.c:558 do_sync_mmap_readahead+0x2c1/0x380 mm/filemap.c:3428 filemap_fault+0x369/0xb60 mm/filemap.c:3582 __do_fault mm/memory.c:5425 [inline] do_read_fault mm/memory.c:5860 [inline] do_fault mm/memory.c:5994 [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+0x167a/0x2da0 mm/memory.c:6686 do_user_addr_fault+0x634/0x1060 arch/x86/mm/fault.c:1343 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 value changed: 0x00000000ffffa6c9 -> 0x00000000ffffa6ca Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 3299 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 ================================================================== syz-executor invoked oom-killer: gfp_mask=0x100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=0 CPU: 0 UID: 0 PID: 3299 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 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 charge_memcg+0x6d/0x120 mm/memcontrol.c:5126 mem_cgroup_swapin_charge_folio+0xc2/0x150 mm/memcontrol.c:5210 __swap_cache_alloc mm/swap_state.c:456 [inline] swap_cache_alloc_folio+0x47b/0x5e0 mm/swap_state.c:524 swap_cache_read_folio mm/swap_state.c:646 [inline] swap_cluster_readahead+0x2b1/0x460 mm/swap_state.c:831 swapin_readahead+0xd8/0x8a0 mm/swap_state.c:984 do_swap_page+0x2a2/0x1ec0 mm/memory.c:4836 handle_pte_fault mm/memory.c:6382 [inline] __handle_mm_fault mm/memory.c:6517 [inline] handle_mm_fault+0xb3c/0x2da0 mm/memory.c:6686 do_user_addr_fault+0x634/0x1060 arch/x86/mm/fault.c:1343 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 RIP: 0033:0x7fd8c69c9017 Code: 48 89 fa 4c 89 df e8 a8 56 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffc91e0e2a0 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 000055557d068500 RCX: 00007fd8c69c9017 RDX: 00007ffc91e0e2e0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ffc91e0e34c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000001388 R13: 00000000000927c0 R14: 00000000000117bd R15: 00007ffc91e0e3a0 memory: usage 290560kB, limit 307200kB, failcnt 2750 memory+swap: usage 207228kB, limit 9007199254740988kB, failcnt 0 kmem: usage 200620kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz1: cache 0 rss 0 shmem 0 mapped_file 0 dirty 0 writeback 0 workingset_refault_anon 583 workingset_refault_file 7308 swap 4390912 swapcached 34074624 pgpgin 30740 pgpgout 30739 pgfault 26871 pgmajfault 441 inactive_anon 0 active_anon 4096 inactive_file 0 active_file 0 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 0 total_rss 0 total_shmem 0 total_mapped_file 0 total_dirty 0 total_writeback 0 total_workingset_refault_anon 583 total_workingset_refault_file 7308 total_swap 4390912 total_swapcached 34074624 total_pgpgin 30740 total_pgpgout 30739 total_pgfault 26871 total_pgmajfault 441 total_inactive_anon 0 total_active_anon 4096 total_inactive_file 0 total_active_file 0 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz1,task_memcg=/syz1,task=syz.1.334,pid=4450,uid=0 Memory cgroup out of memory: Killed process 4450 (syz.1.334) total-vm:94312kB, anon-rss:1244kB, file-rss:22156kB, shmem-rss:0kB, UID:0 pgtables:128kB oom_score_adj:1000