bridge0: received packet on veth0_to_bridge with own address as source address (addr:ba:ae:4e:c3:35:bc, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P22680/1:b..l rcu: (detected by 1, t=10503 jiffies, g=116561, q=1941 ncpus=2) task:syz.1.4660 state:R running task stack:27200 pid:22680 tgid:22679 ppid:17541 task_flags:0x400140 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:5378 [inline] __schedule+0xf43/0x5890 kernel/sched/core.c:6765 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7087 irqentry_exit+0x36/0x90 kernel/entry/common.c:354 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707 RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:122 [inline] RIP: 0010:lock_is_held_type+0x45/0x150 kernel/locking/lockdep.c:5916 Code: 56 0b 05 85 c9 0f 84 dd 00 00 00 65 8b 05 fb 55 ab 74 85 c0 0f 85 ce 00 00 00 65 4c 8b 25 63 a3 ac 74 41 8b 94 24 ec 0a 00 00 <85> d2 0f 85 b6 00 00 00 48 89 fd 41 89 f6 9c 8f 04 24 fa 48 c7 c7 RSP: 0018:ffffc9000c90f330 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8e216588 RBP: ffff88807f5dc880 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88807f5dc880 R13: 00000000ffffffff R14: 0000000000000cc0 R15: 00fff00000020001 lock_is_held include/linux/lockdep.h:249 [inline] task_css include/linux/cgroup.h:434 [inline] blkcg_css.part.0+0xb0/0x1d0 block/blk-cgroup.c:110 blkcg_css block/blk-cgroup.c:2202 [inline] blk_cgroup_congested+0xf8/0x270 block/blk-cgroup.c:2199 __folio_throttle_swaprate+0xa8/0x2f0 mm/swapfile.c:3907 folio_throttle_swaprate include/linux/swap.h:653 [inline] shmem_add_to_page_cache+0x5ae/0x9b0 mm/shmem.c:885 shmem_alloc_and_add_folio+0x662/0xc10 mm/shmem.c:1928 shmem_get_folio_gfp+0x689/0x1530 mm/shmem.c:2522 shmem_fault+0x200/0xae0 mm/shmem.c:2723 __do_fault+0x10a/0x490 mm/memory.c:4988 do_read_fault mm/memory.c:5403 [inline] do_fault mm/memory.c:5537 [inline] do_pte_missing+0xecf/0x3e10 mm/memory.c:4058 handle_pte_fault mm/memory.c:5900 [inline] __handle_mm_fault+0x1166/0x2c60 mm/memory.c:6043 handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6212 faultin_page mm/gup.c:1196 [inline] __get_user_pages+0x773/0x36f0 mm/gup.c:1491 populate_vma_page_range+0x27f/0x3a0 mm/gup.c:1929 __mm_populate+0x1d6/0x380 mm/gup.c:2032 mm_populate include/linux/mm.h:3386 [inline] vm_mmap_pgoff+0x2d3/0x3a0 mm/util.c:580 ksys_mmap_pgoff+0x7d/0x5c0 mm/mmap.c:607 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffa1e38d169 RSP: 002b:00007ffa1f2a5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007ffa1e5a5fa0 RCX: 00007ffa1e38d169 RDX: b635773f06ebbeef RSI: 0000000000b36000 RDI: 0000400000000000 RBP: 00007ffa1e40e2a0 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffa1e5a5fa0 R15: 00007ffe28fb97c8 rcu: rcu_preempt kthread starved for 473 jiffies! g116561 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:27552 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5378 [inline] __schedule+0xf43/0x5890 kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6857 schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2024 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2226 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 186 Comm: kworker/u8:5 Not tainted 6.14.0-rc4-syzkaller-00248-g03d38806a902 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:in_softirq_really kernel/kcov.c:171 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:write_comp_data+0x1f/0x90 kernel/kcov.c:246 Code: 90 90 90 90 90 90 90 90 90 90 90 49 89 d2 49 89 f8 49 89 f1 65 48 8b 15 3f fe 49 7e 65 8b 05 40 fe 49 7e a9 00 01 ff 00 74 1d c4 01 74 67 a9 00 00 0f 00 75 60 a9 00 00 f0 00 75 59 8b 82 2c RSP: 0018:ffffc900000068b0 EFLAGS: 00000206 RAX: 0000000000000101 RBX: 0000000000000003 RCX: ffffffff8a050fed RDX: ffff888021794880 RSI: 00000000fffffffd RDI: 0000000000000005 RBP: ffffc900000069c0 R08: 0000000000000005 R09: 00000000fffffffd R10: 00000000fffffffd R11: 0000000000000008 R12: 00000000fffffffd R13: ffff8880252c38b8 R14: 1ffff92000000d26 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f74875c6ff8 CR3: 000000000df80000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000007767 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: find_match+0x24d/0x15d0 net/ipv6/route.c:756 __find_rr_leaf+0x141/0xe00 net/ipv6/route.c:835 find_rr_leaf net/ipv6/route.c:856 [inline] rt6_select net/ipv6/route.c:900 [inline] fib6_table_lookup+0x57e/0xa30 net/ipv6/route.c:2195 ip6_pol_route+0x1cd/0x1120 net/ipv6/route.c:2231 pol_lookup_func include/net/ip6_fib.h:616 [inline] fib6_rule_lookup+0x536/0x720 net/ipv6/fib6_rules.c:119 ip6_route_input_lookup net/ipv6/route.c:2300 [inline] ip6_route_input+0x663/0xc10 net/ipv6/route.c:2596 ip6_rcv_finish_core.constprop.0+0x1a0/0x5d0 net/ipv6/ip6_input.c:66 ip6_rcv_finish+0x12c/0x5b0 net/ipv6/ip6_input.c:77 ip_sabotage_in+0x21b/0x290 net/bridge/br_netfilter_hooks.c:993 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_slow+0xbb/0x200 net/netfilter/core.c:626 nf_hook.constprop.0+0x42e/0x750 include/linux/netfilter.h:269 NF_HOOK include/linux/netfilter.h:312 [inline] ipv6_rcv+0xa4/0x680 net/ipv6/ip6_input.c:309 __netif_receive_skb_one_core+0x12e/0x1e0 net/core/dev.c:5893 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6006 netif_receive_skb_internal net/core/dev.c:6092 [inline] netif_receive_skb+0x13f/0x7b0 net/core/dev.c:6151 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] br_pass_frame_up+0x346/0x490 net/bridge/br_input.c:70 br_handle_frame_finish+0xecc/0x1c90 net/bridge/br_input.c:226 br_nf_hook_thresh+0x303/0x410 net/bridge/br_netfilter_hooks.c:1170 br_nf_pre_routing_finish_ipv6+0x76a/0xfb0 net/bridge/br_netfilter_ipv6.c:154 NF_HOOK include/linux/netfilter.h:314 [inline] br_nf_pre_routing_ipv6+0x3ce/0x8c0 net/bridge/br_netfilter_ipv6.c:184 br_nf_pre_routing+0x860/0x15b0 net/bridge/br_netfilter_hooks.c:508 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_bridge_pre net/bridge/br_input.c:282 [inline] br_handle_frame+0xad7/0x14a0 net/bridge/br_input.c:433 __netif_receive_skb_core.constprop.0+0xa20/0x4330 net/core/dev.c:5787 __netif_receive_skb_one_core+0xb1/0x1e0 net/core/dev.c:5891 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6006 process_backlog+0x443/0x15f0 net/core/dev.c:6354 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:7188 napi_poll net/core/dev.c:7257 [inline] net_rx_action+0xa94/0x1010 net/core/dev.c:7379 handle_softirqs+0x213/0x8f0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0x4c6/0x12c0 kernel/smp.c:885 Code: 0c 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 fc 4c 89 fd 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 7c 0e 0c 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 e8 0b 00 00 8b 43 08 31 RSP: 0018:ffffc90002f97928 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b8744a80 RCX: ffffffff81add35a RDX: ffff888021794880 RSI: ffffffff81add334 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000006 R12: ffffed10170e8951 R13: 0000000000000001 R14: ffff8880b863fe80 R15: ffff8880b8744a88 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1052 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2118 [inline] text_poke_bp_batch+0x22b/0x760 arch/x86/kernel/alternative.c:2328 text_poke_flush arch/x86/kernel/alternative.c:2519 [inline] text_poke_flush arch/x86/kernel/alternative.c:2516 [inline] text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2526 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x1d7/0x400 kernel/jump_label.c:920 static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate mm/kfence/core.c:850 [inline] toggle_allocation_gate+0xfc/0x260 mm/kfence/core.c:842 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 audit: audit_backlog=65 > audit_backlog_limit=64 audit: audit_backlog=65 > audit_backlog_limit=64 audit: audit_lost=720 audit_rate_limit=0 audit_backlog_limit=64 audit: audit_lost=721 audit_rate_limit=0 audit_backlog_limit=64 audit: backlog limit exceeded audit: audit_backlog=65 > audit_backlog_limit=64 audit: backlog limit exceeded audit: audit_lost=722 audit_rate_limit=0 audit_backlog_limit=64 audit: backlog limit exceeded audit: audit_backlog=65 > audit_backlog_limit=64 net_ratelimit: 55255 callbacks suppressed bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ba:ae:4e:c3:35:bc, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ba:ae:4e:c3:35:bc, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ba:ae:4e:c3:35:bc, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) audit_log_start: 15 callbacks suppressed audit: audit_backlog=65 > audit_backlog_limit=64 audit: audit_backlog=65 > audit_backlog_limit=64 audit: audit_lost=728 audit_rate_limit=0 audit_backlog_limit=64 audit: audit_lost=729 audit_rate_limit=0 audit_backlog_limit=64 audit: backlog limit exceeded audit: backlog limit exceeded net_ratelimit: 65900 callbacks suppressed bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ba:ae:4e:c3:35:bc, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ba:ae:4e:c3:35:bc, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)