bridge0: received packet on veth0_to_bridge with own address as source address (addr:3e:72:e0:2d:5b:3d, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5184/1:b..l rcu: (detected by 1, t=10503 jiffies, g=31125, q=1311 ncpus=2) task:klogd state:R running task stack:25184 pid:5184 tgid:5184 ppid:1 task_flags:0x400100 flags:0x00000002 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x116f/0x5de0 kernel/sched/core.c:6767 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6947 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 unwind_next_frame+0x173a/0x1ff0 arch/x86/kernel/unwind_orc.c:672 __unwind_start+0x45f/0x7f0 arch/x86/kernel/unwind_orc.c:760 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0x73/0x100 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 save_stack+0x160/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x8d/0x400 mm/page_owner.c:297 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0x6d8/0xf40 mm/page_alloc.c:2660 discard_slab mm/slub.c:2707 [inline] __put_partials+0x16d/0x1c0 mm/slub.c:3176 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4138 [inline] slab_alloc_node mm/slub.c:4187 [inline] __do_kmalloc_node mm/slub.c:4317 [inline] __kmalloc_node_track_caller_noprof+0x1d3/0x510 mm/slub.c:4337 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:599 __alloc_skb+0x166/0x380 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1340 [inline] alloc_skb_with_frags+0xe0/0x860 net/core/skbuff.c:6639 sock_alloc_send_pskb+0x7fb/0x990 net/core/sock.c:2949 unix_dgram_sendmsg+0x463/0x1910 net/unix/af_unix.c:2007 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] __sys_sendto+0x495/0x510 net/socket.c:2180 __do_sys_sendto net/socket.c:2187 [inline] __se_sys_sendto net/socket.c:2183 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2183 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2fe06bd9b5 RSP: 002b:00007fff5e668dc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2fe06bd9b5 RDX: 00000000000000a1 RSI: 000055ecebc6e180 RDI: 0000000000000003 RBP: 000055ecebc652c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013 R13: 00007f2fe084b212 R14: 00007fff5e668ec8 R15: 0000000000000000 rcu: rcu_preempt kthread starved for 3426 jiffies! g31125 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 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:28856 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x116f/0x5de0 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6860 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2046 rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2248 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.14.0-syzkaller-09584-g7d06015d936c #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:lock_release+0x183/0x2f0 kernel/locking/lockdep.c:5891 Code: 0f c1 05 98 1c 0c 12 83 f8 01 0f 85 1d 01 00 00 9c 58 f6 c4 02 0f 85 08 01 00 00 41 f7 c5 00 02 00 00 74 01 fb 48 8b 44 24 10 <65> 48 2b 05 ed de 0b 12 0f 85 58 01 00 00 48 83 c4 18 5b 41 5c 41 RSP: 0018:ffffc90000a07d78 EFLAGS: 00000206 RAX: edd98052e13be000 RBX: ffffffff8e3bdcc0 RCX: ffffc90000a07d84 RDX: 0000000000000003 RSI: ffffffff8dbbb1fa RDI: ffffffff8bf3f240 RBP: ffff88803577fd80 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8a46529a R13: 0000000000000206 R14: ffff88801d6aa440 R15: 0000000000000004 FS: 0000000000000000(0000) GS:ffff888124ae0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7298777d38 CR3: 000000005be78000 CR4: 00000000003526f0 DR0: 0100000100000000 DR1: 0000000000000006 DR2: 0000000000000005 DR3: 0000000000000011 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] net_generic+0xef/0x2a0 include/net/netns/generic.h:48 is_pppoe_ip net/bridge/br_netfilter_hooks.c:122 [inline] br_nf_post_routing+0x385/0x1190 net/bridge/br_netfilter_hooks.c:950 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_slow+0xbb/0x200 net/netfilter/core.c:626 nf_hook+0x45e/0x780 include/linux/netfilter.h:269 NF_HOOK include/linux/netfilter.h:312 [inline] br_forward_finish+0xcd/0x130 net/bridge/br_forward.c:66 br_nf_hook_thresh+0x301/0x410 net/bridge/br_netfilter_hooks.c:1170 br_nf_forward_finish+0x66a/0xba0 net/bridge/br_netfilter_hooks.c:665 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] br_nf_forward_ip.part.0+0x609/0x810 net/bridge/br_netfilter_hooks.c:719 br_nf_forward_ip net/bridge/br_netfilter_hooks.c:679 [inline] br_nf_forward+0xf0f/0x1be0 net/bridge/br_netfilter_hooks.c:776 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_slow+0xbb/0x200 net/netfilter/core.c:626 nf_hook+0x45e/0x780 include/linux/netfilter.h:269 NF_HOOK include/linux/netfilter.h:312 [inline] __br_forward+0x1be/0x5b0 net/bridge/br_forward.c:115 deliver_clone net/bridge/br_forward.c:131 [inline] maybe_deliver+0xf1/0x180 net/bridge/br_forward.c:190 br_flood+0x17c/0x650 net/bridge/br_forward.c:237 br_handle_frame_finish+0xe8e/0x1c20 net/bridge/br_input.c:220 br_nf_hook_thresh+0x301/0x410 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+0x3cd/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+0xad5/0x14a0 net/bridge/br_input.c:433 __netif_receive_skb_core.constprop.0+0xa23/0x4a00 net/core/dev.c:5777 __netif_receive_skb_one_core+0xb0/0x1e0 net/core/dev.c:5889 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6004 process_backlog+0x442/0x15e0 net/core/dev.c:6356 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:7328 napi_poll net/core/dev.c:7392 [inline] net_rx_action+0xa97/0x1010 net/core/dev.c:7514 handle_softirqs+0x216/0x8e0 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:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:92 [inline] RIP: 0010:acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:112 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 05 f0 ef 36 08 48 8b 00 a8 08 75 0c 66 90 0f 00 2d c8 49 92 00 fb f4 c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90000197d50 EFLAGS: 00000246 RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffff8b6cf359 RDX: 0000000000000001 RSI: ffff8880212a6800 RDI: ffff8880212a6864 RBP: ffff8880212a6864 R08: 0000000000000001 R09: ffffed10170a65bd R10: ffff8880b8532deb R11: 0000000000000000 R12: ffff88801eb4b800 R13: ffffffff8f03e560 R14: 0000000000000001 R15: 0000000000000000 acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:701 cpuidle_enter_state+0xb2/0x500 drivers/cpuidle/cpuidle.c:268 cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:389 call_cpuidle kernel/sched/idle.c:155 [inline] cpuidle_idle_call kernel/sched/idle.c:230 [inline] do_idle+0x378/0x510 kernel/sched/idle.c:325 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423 start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:315 common_startup_64+0x13e/0x148 net_ratelimit: 34624 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:3e:72:e0:2d:5b:3d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3e:72:e0:2d:5b:3d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3e:72:e0:2d:5b:3d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3e:72:e0:2d:5b:3d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3e:72:e0:2d:5b:3d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3e:72:e0:2d:5b:3d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3e:72:e0:2d:5b:3d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3e:72:e0:2d:5b:3d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3e:72:e0:2d:5b:3d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3e:72:e0:2d:5b:3d, vlan:0)