================================================================== BUG: KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 read-write to 0xffffffff86c09a00 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:1785 [inline] __hrtimer_run_queues+0x218/0x4f0 kernel/time/hrtimer.c:1849 hrtimer_interrupt+0x269/0x810 kernel/time/hrtimer.c:1911 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x5f/0x1f0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1056 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 mem_cgroup_print_oom_meminfo+0x20b/0x260 mm/memcontrol.c:1603 dump_header+0xa2/0x240 mm/oom_kill.c:469 oom_kill_process+0x295/0x350 mm/oom_kill.c:1047 out_of_memory+0x97d/0xb80 mm/oom_kill.c:1185 mem_cgroup_out_of_memory mm/memcontrol.c:1695 [inline] mem_cgroup_oom mm/memcontrol.c:1718 [inline] try_charge_memcg+0x62e/0xa10 mm/memcontrol.c:2456 try_charge mm/memcontrol.c:2556 [inline] charge_memcg mm/memcontrol.c:4744 [inline] __mem_cgroup_charge+0x65/0x150 mm/memcontrol.c:4761 mem_cgroup_charge include/linux/memcontrol.h:664 [inline] shmem_alloc_and_add_folio mm/shmem.c:1982 [inline] shmem_get_folio_gfp+0x47b/0xd60 mm/shmem.c:2567 shmem_get_folio mm/shmem.c:2673 [inline] shmem_write_begin+0xfc/0x1f0 mm/shmem.c:3327 generic_perform_write+0x183/0x490 mm/filemap.c:4314 shmem_file_write_iter+0xc5/0xf0 mm/shmem.c:3502 __kernel_write_iter+0x319/0x590 fs/read_write.c:621 dump_emit_page fs/coredump.c:1299 [inline] dump_user_range+0xa7d/0xdb0 fs/coredump.c:1373 elf_core_dump+0x21a2/0x2330 fs/binfmt_elf.c:2110 coredump_write+0xacc/0xdd0 fs/coredump.c:1050 do_coredump fs/coredump.c:1127 [inline] vfs_coredump+0x26c7/0x3130 fs/coredump.c:1201 get_signal+0xd80/0xf60 kernel/signal.c:3019 arch_do_signal_or_restart+0x96/0x450 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop kernel/entry/common.c:98 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline] irqentry_exit+0xf7/0x520 kernel/entry/common.c:219 exc_general_protection+0x153/0x1e0 arch/x86/kernel/traps.c:913 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:612 read to 0xffffffff86c09a00 of 8 bytes by task 32161 on cpu 0: mem_cgroup_flush_stats_ratelimited+0x29/0x70 mm/memcontrol.c:638 count_shadow_nodes+0x6a/0x230 mm/workingset.c:678 do_shrink_slab+0x63/0x6a0 mm/shrinker.c:384 shrink_slab_memcg mm/shrinker.c:550 [inline] shrink_slab+0x538/0x880 mm/shrinker.c:628 shrink_node_memcgs mm/vmscan.c:6022 [inline] shrink_node+0x6bc/0x2130 mm/vmscan.c:6061 shrink_zones mm/vmscan.c:6300 [inline] do_try_to_free_pages+0x408/0xc80 mm/vmscan.c:6362 try_to_free_mem_cgroup_pages+0x1f5/0x470 mm/vmscan.c:6683 try_charge_memcg+0x37e/0xa10 mm/memcontrol.c:2414 try_charge mm/memcontrol.c:2556 [inline] charge_memcg mm/memcontrol.c:4744 [inline] __mem_cgroup_charge+0x65/0x150 mm/memcontrol.c:4761 mem_cgroup_charge include/linux/memcontrol.h:664 [inline] shmem_alloc_and_add_folio mm/shmem.c:1982 [inline] shmem_get_folio_gfp+0x47b/0xd60 mm/shmem.c:2567 shmem_get_folio mm/shmem.c:2673 [inline] shmem_write_begin+0xfc/0x1f0 mm/shmem.c:3327 generic_perform_write+0x183/0x490 mm/filemap.c:4314 shmem_file_write_iter+0xc5/0xf0 mm/shmem.c:3502 __kernel_write_iter+0x319/0x590 fs/read_write.c:621 dump_emit_page fs/coredump.c:1299 [inline] dump_user_range+0xa7d/0xdb0 fs/coredump.c:1373 elf_core_dump+0x21a2/0x2330 fs/binfmt_elf.c:2110 coredump_write+0xacc/0xdd0 fs/coredump.c:1050 do_coredump fs/coredump.c:1127 [inline] vfs_coredump+0x26c7/0x3130 fs/coredump.c:1201 get_signal+0xd80/0xf60 kernel/signal.c:3019 arch_do_signal_or_restart+0x96/0x450 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop kernel/entry/common.c:98 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline] irqentry_exit+0xf7/0x520 kernel/entry/common.c:219 exc_general_protection+0x153/0x1e0 arch/x86/kernel/traps.c:913 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:612 value changed: 0x000000010000ecf5 -> 0x000000010000ecf6 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 32161 Comm: syz.0.5597 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ================================================================== syz.0.5597 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000 CPU: 0 UID: 0 PID: 32161 Comm: syz.0.5597 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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:467 oom_kill_process+0x295/0x350 mm/oom_kill.c:1047 out_of_memory+0x97d/0xb80 mm/oom_kill.c:1185 mem_cgroup_out_of_memory mm/memcontrol.c:1695 [inline] mem_cgroup_oom mm/memcontrol.c:1718 [inline] try_charge_memcg+0x62e/0xa10 mm/memcontrol.c:2456 try_charge mm/memcontrol.c:2556 [inline] charge_memcg mm/memcontrol.c:4744 [inline] __mem_cgroup_charge+0x65/0x150 mm/memcontrol.c:4761 mem_cgroup_charge include/linux/memcontrol.h:664 [inline] shmem_alloc_and_add_folio mm/shmem.c:1982 [inline] shmem_get_folio_gfp+0x47b/0xd60 mm/shmem.c:2567 shmem_get_folio mm/shmem.c:2673 [inline] shmem_write_begin+0xfc/0x1f0 mm/shmem.c:3327 generic_perform_write+0x183/0x490 mm/filemap.c:4314 shmem_file_write_iter+0xc5/0xf0 mm/shmem.c:3502 __kernel_write_iter+0x319/0x590 fs/read_write.c:621 dump_emit_page fs/coredump.c:1299 [inline] dump_user_range+0xa7d/0xdb0 fs/coredump.c:1373 elf_core_dump+0x21a2/0x2330 fs/binfmt_elf.c:2110 coredump_write+0xacc/0xdd0 fs/coredump.c:1050 do_coredump fs/coredump.c:1127 [inline] vfs_coredump+0x26c7/0x3130 fs/coredump.c:1201 get_signal+0xd80/0xf60 kernel/signal.c:3019 arch_do_signal_or_restart+0x96/0x450 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop kernel/entry/common.c:98 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline] irqentry_exit+0xf7/0x520 kernel/entry/common.c:219 exc_general_protection+0x153/0x1e0 arch/x86/kernel/traps.c:913 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:612 RIP: 0033:0x7fe4e89ac7a1 Code: 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 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:00002000000005c0 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007fe4e8c26090 RCX: 00007fe4e89ac799 RDX: 0000200000000180 RSI: 00002000000005c0 RDI: 0000000000008000 RBP: 00007fe4e8a42bd9 R08: 0000200000000700 R09: 0000200000000700 R10: 00002000000001c0 R11: 0000000000000206 R12: 0000000000000000 R13: 00007fe4e8c26128 R14: 00007fe4e8c26090 R15: 00007fff2b05f3f8 memory: usage 301140kB, limit 307200kB, failcnt 28770 memory+swap: usage 379380kB, limit 9007199254740988kB, failcnt 0 kmem: usage 14012kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz0: cache 242892800 rss 237568 shmem 242892800 mapped_file 0 dirty 0 writeback 274432 workingset_refault_anon 630 workingset_refault_file 0 swap 127610880 swapcached 228913152 pgpgin 914540 pgpgout 855086 pgfault 601982 pgmajfault 219 inactive_anon 55721984 active_anon 187400192 inactive_file 0 active_file 28672 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 242892800 total_rss 237568 total_shmem 242892800 total_mapped_file 0 total_dirty 0 total_writeback 274432 total_workingset_refault_anon 630 total_workingset_refault_file 0 total_swap 127610880 total_swapcached 228913152 total_pgpgin 914547 total_pgpgout 855093 total_pgfault 602051 total_pgmajfault 219 total_inactive_anon 55721984 total_active_anon 187400192 total_inactive_file 0 total_active_file 28672 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz0,task_memcg=/syz0,task=syz.0.5597,pid=32161,uid=0 Memory cgroup out of memory: Killed process 32161 (syz.0.5597) total-vm:90320kB, anon-rss:1236kB, file-rss:59008kB, shmem-rss:0kB, UID:0 pgtables:196kB oom_score_adj:1000