oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz1,task_memcg=/syz1,task=syz.1.6852,pid=22171,uid=0 Memory cgroup out of memory: Killed process 22171 (syz.1.6852) total-vm:93836kB, anon-rss:1144kB, file-rss:20736kB, shmem-rss:0kB, UID:0 pgtables:88kB oom_score_adj:1000 ================================================================== BUG: KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 read-write to 0xffffffff86809a00 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:1777 [inline] __hrtimer_run_queues+0x20f/0x5a0 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x21a/0x460 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x5f/0x1d0 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 __sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:213 shrink_dcache_tree+0x18c/0x1c0 fs/dcache.c:1609 shrink_dcache_parent fs/dcache.c:1616 [inline] d_invalidate+0xa8/0x200 fs/dcache.c:1698 proc_invalidate_siblings_dcache+0x1c0/0x2a0 fs/proc/inode.c:142 proc_flush_pid+0x1d/0x30 fs/proc/base.c:3478 release_task+0x988/0xb60 kernel/exit.c:291 wait_task_zombie kernel/exit.c:1274 [inline] wait_consider_task+0x114a/0x1660 kernel/exit.c:1501 do_wait_thread kernel/exit.c:1564 [inline] __do_wait+0xfa/0x510 kernel/exit.c:1682 do_wait+0xb7/0x250 kernel/exit.c:1716 kernel_wait4+0x16b/0x1e0 kernel/exit.c:1875 __do_sys_wait4 kernel/exit.c:1903 [inline] __se_sys_wait4 kernel/exit.c:1899 [inline] __x64_sys_wait4+0x91/0x120 kernel/exit.c:1899 x64_sys_call+0x28ec/0x3000 arch/x86/include/generated/asm/syscalls_64.h:62 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff86809a00 of 8 bytes by task 23726 on cpu 0: mem_cgroup_flush_stats_ratelimited+0x29/0x70 mm/memcontrol.c:636 count_shadow_nodes+0x6a/0x230 mm/workingset.c:678 do_shrink_slab+0x63/0x680 mm/shrinker.c:384 shrink_slab_memcg mm/shrinker.c:550 [inline] shrink_slab+0x4f5/0x840 mm/shrinker.c:628 shrink_node_memcgs mm/vmscan.c:6022 [inline] shrink_node+0x6a9/0x2010 mm/vmscan.c:6061 shrink_zones mm/vmscan.c:6300 [inline] do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6362 try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6690 try_charge_memcg+0x383/0xa10 mm/memcontrol.c:2388 try_charge mm/memcontrol.c:2530 [inline] charge_memcg+0x51/0xc0 mm/memcontrol.c:4728 mem_cgroup_swapin_charge_folio+0xcc/0x150 mm/memcontrol.c:4814 __read_swap_cache_async+0x17b/0x2d0 mm/swap_state.c:481 swap_cluster_readahead+0x362/0x3c0 mm/swap_state.c:665 swapin_readahead+0xde/0x820 mm/swap_state.c:821 do_swap_page+0x2b4/0x21e0 mm/memory.c:4753 handle_pte_fault mm/memory.c:6276 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0x9d8/0x2c60 mm/memory.c:6580 do_user_addr_fault+0x630/0x1080 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 value changed: 0x000000010000106f -> 0x0000000100001070 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 23726 Comm: syz.1.7335 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 ================================================================== syz.1.7335 invoked oom-killer: gfp_mask=0x100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=0 CPU: 0 UID: 0 PID: 23726 Comm: syz.1.7335 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 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+0x81/0x240 mm/oom_kill.c:467 oom_kill_process+0x295/0x350 mm/oom_kill.c:1047 out_of_memory+0x97b/0xb80 mm/oom_kill.c:1185 mem_cgroup_out_of_memory mm/memcontrol.c:1682 [inline] mem_cgroup_oom mm/memcontrol.c:1705 [inline] try_charge_memcg+0x610/0xa10 mm/memcontrol.c:2430 try_charge mm/memcontrol.c:2530 [inline] charge_memcg+0x51/0xc0 mm/memcontrol.c:4728 mem_cgroup_swapin_charge_folio+0xcc/0x150 mm/memcontrol.c:4814 __read_swap_cache_async+0x17b/0x2d0 mm/swap_state.c:481 swap_cluster_readahead+0x262/0x3c0 mm/swap_state.c:646 swapin_readahead+0xde/0x820 mm/swap_state.c:821 do_swap_page+0x2b4/0x21e0 mm/memory.c:4753 handle_pte_fault mm/memory.c:6276 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0x9d8/0x2c60 mm/memory.c:6580 do_user_addr_fault+0x630/0x1080 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7f8ae1f2d71f Code: 1f 84 00 00 00 00 00 0f 1f 40 00 41 89 fb 44 8d 56 04 4c 8d 0d f2 48 38 00 89 f0 4c 8d 05 e9 28 38 00 89 c2 81 e2 ff 1f 00 00 <49> 8b 0c d1 48 39 f1 74 28 48 85 c9 74 29 45 38 1c 10 75 23 83 c0 RSP: 002b:00007fff5720e538 EFLAGS: 00010206 RAX: 0000000081d57559 RBX: 00007f8ae2df5720 RCX: 000000000000001c RDX: 0000000000001559 RSI: ffffffff81d57559 RDI: 0000000000000004 RBP: ffffffff81d57559 R08: 00007f8ae22b0000 R09: 00007f8ae22b2000 R10: 0000000081d5755d R11: 0000000000000004 R12: 0000000000000004 R13: 000000000000001c R14: ffffffff81d57870 R15: 000000000000001c memory: usage 307200kB, limit 307200kB, failcnt 3711 memory+swap: usage 319796kB, limit 9007199254740988kB, failcnt 0 kmem: usage 307148kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz1: cache 0 rss 4096 shmem 0 mapped_file 0 dirty 0 writeback 8192 workingset_refault_anon 393 workingset_refault_file 0 swap 12898304 swapcached 8192 pgpgin 243123 pgpgout 243110 pgfault 275610 pgmajfault 197 inactive_anon 8192 active_anon 0 inactive_file 0 active_file 45056 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 0 total_rss 4096 total_shmem 0 total_mapped_file 0 total_dirty 0 total_writeback 8192 total_workingset_refault_anon 393 total_workingset_refault_file 0 total_swap 12898304 total_swapcached 8192 total_pgpgin 243123 total_pgpgout 243110 total_pgfault 275610 total_pgmajfault 197 total_inactive_anon 8192 total_active_anon 0 total_inactive_file 0 total_active_file 45056 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz1,task_memcg=/syz1,task=syz.1.6236,pid=20393,uid=0 Memory cgroup out of memory: Killed process 20393 (syz.1.6236) total-vm:93836kB, anon-rss:1144kB, file-rss:20736kB, shmem-rss:0kB, UID:0 pgtables:88kB oom_score_adj:1000