================================================================== 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 console_flush_all+0x55b/0x730 arch/x86/include/asm/irqflags.h:-1 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xa1/0x330 kernel/printk/printk.c:3325 vprintk_emit+0x388/0x650 kernel/printk/printk.c:2450 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2475 __nla_validate_parse+0x1738/0x1d00 lib/nlattr.c:647 __nla_parse+0x40/0x60 lib/nlattr.c:732 __nlmsg_parse include/net/netlink.h:765 [inline] nlmsg_parse_deprecated include/net/netlink.h:806 [inline] rtnl_newlink+0xf1/0x12d0 net/core/rtnetlink.c:3970 rtnetlink_rcv_msg+0x5fb/0x6d0 net/core/rtnetlink.c:6955 netlink_rcv_skb+0x120/0x220 net/netlink/af_netlink.c:2534 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:6982 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x59e/0x670 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x58b/0x6b0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x142/0x180 net/socket.c:727 ____sys_sendmsg+0x31e/0x4e0 net/socket.c:2566 ___sys_sendmsg+0x17b/0x1d0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2655 x64_sys_call+0x2999/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:47 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 20558 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_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: 0x0000000100000057 -> 0x0000000100000058 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 20558 Comm: syz.3.5292 Tainted: G W 6.15.0-rc5-syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 ================================================================== syz.3.5292 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000 CPU: 0 UID: 0 PID: 20558 Comm: syz.3.5292 Tainted: G W 6.15.0-rc5-syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN 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: 0033:0x7faad5ade971 Code: 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:0000000000000020 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007faad5d05fa0 RCX: 00007faad5ade969 RDX: 0000000000000000 RSI: 0000000000000020 RDI: 0000000000000600 RBP: 00007faad5b60ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 00007faad5d05fa0 R15: 00007fffc7734248 memory: usage 307200kB, limit 307200kB, failcnt 23824 memory+swap: usage 431780kB, limit 9007199254740988kB, failcnt 0 kmem: usage 4096kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz3: cache 308477952 rss 126976 shmem 308473856 mapped_file 0 dirty 0 writeback 32768 workingset_refault_anon 43 workingset_refault_file 486 swap 127913984 swapcached 81920 pgpgin 376514 pgpgout 301156 pgfault 284266 pgmajfault 41 inactive_anon 88506368 active_anon 219635712 inactive_file 20480 active_file 0 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 308477952 total_rss 126976 total_shmem 308473856 total_mapped_file 0 total_dirty 0 total_writeback 32768 total_workingset_refault_anon 43 total_workingset_refault_file 486 total_swap 127913984 total_swapcached 81920 total_pgpgin 376514 total_pgpgout 301156 total_pgfault 284266 total_pgmajfault 41 total_inactive_anon 88506368 total_active_anon 219635712 total_inactive_file 20480 total_active_file 0 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz3,task_memcg=/syz3,task=syz.3.5292,pid=20565,uid=0 Memory cgroup out of memory: Killed process 20565 (syz.3.5292) total-vm:89908kB, anon-rss:960kB, file-rss:53376kB, shmem-rss:0kB, UID:0 pgtables:180kB oom_score_adj:1000