================================================================== 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 0: 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 kcsan_setup_watchpoint+0x415/0x430 kernel/kcsan/core.c:705 avtab_search_node+0x49/0x2b0 security/selinux/ss/avtab.c:187 context_struct_compute_av+0x332/0xaa0 security/selinux/ss/services.c:664 security_compute_av+0x25c/0x920 security/selinux/ss/services.c:1169 avc_compute_av+0x5a/0x3e0 security/selinux/avc.c:992 avc_perm_nonode+0x5e/0xe0 security/selinux/avc.c:1117 avc_has_perm_noaudit+0x156/0x200 security/selinux/avc.c:1160 avc_has_perm+0x61/0x150 security/selinux/avc.c:1195 inode_has_perm security/selinux/hooks.c:1676 [inline] file_has_perm+0x324/0x370 security/selinux/hooks.c:1766 selinux_revalidate_file_permission security/selinux/hooks.c:3628 [inline] selinux_file_permission+0x31f/0x360 security/selinux/hooks.c:3649 security_file_permission+0x3e/0x80 security/security.c:2844 rw_verify_area fs/read_write.c:471 [inline] vfs_write+0x135/0x8d0 fs/read_write.c:675 ksys_write+0xda/0x1a0 fs/read_write.c:736 __do_sys_write fs/read_write.c:747 [inline] __se_sys_write fs/read_write.c:744 [inline] __x64_sys_write+0x40/0x50 fs/read_write.c:744 x64_sys_call+0x2cdd/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff868099c0 of 8 bytes by task 3311 on cpu 1: 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_swapin_charge_folio+0xcc/0x150 mm/memcontrol.c:4678 __read_swap_cache_async+0x1df/0x350 mm/swap_state.c:444 swap_cluster_readahead+0x277/0x3e0 mm/swap_state.c:616 swapin_readahead+0xde/0x6f0 mm/swap_state.c:814 do_swap_page+0x301/0x2460 mm/memory.c:4532 handle_pte_fault mm/memory.c:6000 [inline] __handle_mm_fault mm/memory.c:6140 [inline] handle_mm_fault+0xb60/0x2ae0 mm/memory.c:6309 do_user_addr_fault+0x636/0x1090 arch/x86/mm/fault.c:1337 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x54/0xc0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 value changed: 0x00000000ffffab51 -> 0x00000000ffffab52 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 3311 Comm: syz-executor Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 ================================================================== syz-executor invoked oom-killer: gfp_mask=0x100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=0 CPU: 0 UID: 0 PID: 3311 Comm: syz-executor Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #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_swapin_charge_folio+0xcc/0x150 mm/memcontrol.c:4678 __read_swap_cache_async+0x1df/0x350 mm/swap_state.c:444 swap_cluster_readahead+0x277/0x3e0 mm/swap_state.c:616 swapin_readahead+0xde/0x6f0 mm/swap_state.c:814 do_swap_page+0x301/0x2460 mm/memory.c:4532 handle_pte_fault mm/memory.c:6000 [inline] __handle_mm_fault mm/memory.c:6140 [inline] handle_mm_fault+0xb60/0x2ae0 mm/memory.c:6309 do_user_addr_fault+0x636/0x1090 arch/x86/mm/fault.c:1337 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x54/0xc0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7fb986c111e5 Code: 00 00 00 00 00 83 ff 03 74 7b 83 ff 02 b8 fa ff ff ff 49 89 ca 0f 44 f8 80 3d 5e 33 1c 00 00 74 14 b8 e6 00 00 00 0f 05 f7 d8 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec 28 48 89 54 24 10 89 74 RSP: 002b:00007fff46eb7d68 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000189 RCX: 00007fb986c111e3 RDX: 00007fff46eb7d80 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fff46eb7dec R08: 0000000029deb22c R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000001388 R13: 00000000000927c0 R14: 0000000000014475 R15: 00007fff46eb7e40 memory: usage 307200kB, limit 307200kB, failcnt 10254 memory+swap: usage 254676kB, limit 9007199254740988kB, failcnt 0 kmem: usage 254480kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz0: cache 0 rss 0 shmem 0 mapped_file 0 dirty 0 writeback 0 workingset_refault_anon 61 workingset_refault_file 45 swap 192512 swapcached 8192 pgpgin 194607 pgpgout 194605 pgfault 44995 pgmajfault 24 inactive_anon 8192 active_anon 0 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 61 total_workingset_refault_file 45 total_swap 192512 total_swapcached 8192 total_pgpgin 194607 total_pgpgout 194605 total_pgfault 44995 total_pgmajfault 24 total_inactive_anon 8192 total_active_anon 0 total_inactive_file 0 total_active_file 0 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz0,task_memcg=/syz0,task=syz.0.723,pid=5567,uid=0 Memory cgroup out of memory: Killed process 5567 (syz.0.723) total-vm:93748kB, anon-rss:936kB, file-rss:22440kB, shmem-rss:0kB, UID:0 pgtables:124kB oom_score_adj:1000