================================================================== BUG: KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 read-write to 0xffffffff868099c0 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:232 [inline] tick_nohz_handler+0x7f/0x2d0 kernel/time/tick-sched.c:290 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x20c/0x5a0 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x21a/0x460 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x5c/0x1d0 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x6f/0x80 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 folio_remove_rmap_ptes+0x5/0x1a0 mm/rmap.c:1803 zap_present_folio_ptes mm/memory.c:1525 [inline] zap_present_ptes mm/memory.c:1586 [inline] do_zap_pte_range mm/memory.c:1687 [inline] zap_pte_range mm/memory.c:1731 [inline] zap_pmd_range mm/memory.c:1823 [inline] zap_pud_range mm/memory.c:1852 [inline] zap_p4d_range mm/memory.c:1873 [inline] unmap_page_range+0xe28/0x27b0 mm/memory.c:1894 unmap_single_vma+0x138/0x1d0 mm/memory.c:1940 unmap_vmas+0x18a/0x2b0 mm/memory.c:1984 exit_mmap+0x1b0/0x6c0 mm/mmap.c:1284 __mmput+0x28/0x1c0 kernel/fork.c:1379 mmput+0x40/0x50 kernel/fork.c:1401 exit_mm+0xe4/0x190 kernel/exit.c:589 do_exit+0x55f/0x17c0 kernel/exit.c:940 do_group_exit+0xff/0x140 kernel/exit.c:1102 get_signal+0xe59/0xf70 kernel/signal.c:3034 arch_do_signal_or_restart+0x97/0x480 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x68/0xb0 kernel/entry/common.c:218 do_syscall_64+0xdd/0x1a0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff868099c0 of 8 bytes by task 4243 on cpu 0: mem_cgroup_flush_stats_ratelimited+0x29/0x70 mm/memcontrol.c:643 count_shadow_nodes+0x6a/0x230 mm/workingset.c:680 do_shrink_slab+0x60/0x680 mm/shrinker.c:384 shrink_slab_memcg mm/shrinker.c:550 [inline] shrink_slab+0x448/0x760 mm/shrinker.c:628 shrink_node_memcgs mm/vmscan.c:5991 [inline] shrink_node+0x6c3/0x2110 mm/vmscan.c:6030 shrink_zones mm/vmscan.c:6274 [inline] do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6336 try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6664 try_charge_memcg+0x3ab/0x870 mm/memcontrol.c:2304 try_charge mm/memcontrol.c:2446 [inline] charge_memcg+0x51/0xc0 mm/memcontrol.c:4592 __mem_cgroup_charge+0x28/0xb0 mm/memcontrol.c:4609 mem_cgroup_charge include/linux/memcontrol.h:642 [inline] shmem_alloc_and_add_folio mm/shmem.c:1903 [inline] shmem_get_folio_gfp+0x470/0xd40 mm/shmem.c:2533 shmem_get_folio mm/shmem.c:2639 [inline] shmem_write_begin+0xa8/0x190 mm/shmem.c:3289 generic_perform_write+0x181/0x490 mm/filemap.c:4103 shmem_file_write_iter+0xc5/0xf0 mm/shmem.c:3464 __kernel_write_iter+0x253/0x4c0 fs/read_write.c:617 dump_emit_page fs/coredump.c:885 [inline] dump_user_range+0x5f4/0x8d0 fs/coredump.c:959 elf_core_dump+0x1dc2/0x1f80 fs/binfmt_elf.c:2128 do_coredump+0x1836/0x1f40 fs/coredump.c:759 get_signal+0xd85/0xf70 kernel/signal.c:3019 arch_do_signal_or_restart+0x97/0x480 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] irqentry_exit_to_user_mode+0x5e/0xa0 kernel/entry/common.c:231 irqentry_exit+0x12/0x50 kernel/entry/common.c:334 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 value changed: 0x00000000ffffa843 -> 0x00000000ffffa844 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 4243 Comm: syz.5.182 Not tainted 6.15.0-rc4-syzkaller-00296-ge8ab83e34bdc #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 ================================================================== syz.5.182 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000 CPU: 1 UID: 0 PID: 4243 Comm: syz.5.182 Not tainted 6.15.0-rc4-syzkaller-00296-ge8ab83e34bdc #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call Trace: __dump_stack+0x1d/0x30 lib/dump_stack.c:94 dump_stack_lvl+0xe8/0x140 lib/dump_stack.c:120 dump_stack+0x15/0x1b lib/dump_stack.c:129 dump_header+0x81/0x220 mm/oom_kill.c:467 oom_kill_process+0x334/0x3f0 mm/oom_kill.c:1040 out_of_memory+0x979/0xb80 mm/oom_kill.c:1178 mem_cgroup_out_of_memory+0x13d/0x190 mm/memcontrol.c:1667 mem_cgroup_oom mm/memcontrol.c:1690 [inline] try_charge_memcg+0x5e2/0x870 mm/memcontrol.c:2346 try_charge mm/memcontrol.c:2446 [inline] charge_memcg+0x51/0xc0 mm/memcontrol.c:4592 __mem_cgroup_charge+0x28/0xb0 mm/memcontrol.c:4609 mem_cgroup_charge include/linux/memcontrol.h:642 [inline] shmem_alloc_and_add_folio mm/shmem.c:1903 [inline] shmem_get_folio_gfp+0x470/0xd40 mm/shmem.c:2533 shmem_get_folio mm/shmem.c:2639 [inline] shmem_write_begin+0xa8/0x190 mm/shmem.c:3289 generic_perform_write+0x181/0x490 mm/filemap.c:4103 shmem_file_write_iter+0xc5/0xf0 mm/shmem.c:3464 __kernel_write_iter+0x253/0x4c0 fs/read_write.c:617 dump_emit_page fs/coredump.c:885 [inline] dump_user_range+0x5f4/0x8d0 fs/coredump.c:959 elf_core_dump+0x1dc2/0x1f80 fs/binfmt_elf.c:2128 do_coredump+0x1836/0x1f40 fs/coredump.c:759 get_signal+0xd85/0xf70 kernel/signal.c:3019 arch_do_signal_or_restart+0x97/0x480 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] irqentry_exit_to_user_mode+0x5e/0xa0 kernel/entry/common.c:231 irqentry_exit+0x12/0x50 kernel/entry/common.c:334 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 002b:0000200000000588 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f3478046160 RCX: 00007f3477e1e969 RDX: 0000200000000600 RSI: 0000200000000580 RDI: 0000000000000000 RBP: 00007f3477ea0ab1 R08: 0000200000000680 R09: 0000200000000680 R10: 0000200000000640 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f3478046160 R15: 00007ffce89de348 memory: usage 307200kB, limit 307200kB, failcnt 24121 memory+swap: usage 432040kB, limit 9007199254740988kB, failcnt 0 kmem: usage 4144kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz5: cache 309997568 rss 208896 shmem 309997568 mapped_file 0 dirty 0 writeback 0 workingset_refault_anon 65 workingset_refault_file 709 swap 127836160 swapcached 159744 pgpgin 139573 pgpgout 63809 pgfault 13473 pgmajfault 83 inactive_anon 774144 active_anon 309547008 inactive_file 0 active_file 4096 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 309997568 total_rss 208896 total_shmem 309997568 total_mapped_file 0 total_dirty 0 total_writeback 0 total_workingset_refault_anon 65 total_workingset_refault_file 709 total_swap 127836160 total_swapcached 159744 total_pgpgin 139573 total_pgpgout 63809 total_pgfault 13473 total_pgmajfault 83 total_inactive_anon 774144 total_active_anon 309547008 total_inactive_file 0 total_active_file 4096 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz5,task_memcg=/syz5,task=syz.5.182,pid=4271,uid=0 Memory cgroup out of memory: Killed process 4271 (syz.5.182) total-vm:90040kB, anon-rss:1048kB, file-rss:28840kB, shmem-rss:0kB, UID:0 pgtables:184kB oom_score_adj:1000