bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10719/1:b..l rcu: (detected by 1, t=10502 jiffies, g=45621, q=2818 ncpus=2) task:syz.4.1245 state:S stack:24536 pid:10719 tgid:10713 ppid:5846 task_flags:0x400040 flags:0x20004002 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7090 irqentry_exit+0x6f/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:100 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:227 [inline] RIP: 0010:unwind_next_frame+0x12e7/0x2390 arch/x86/kernel/unwind_orc.c:494 Code: 48 c7 c7 a0 1d 68 8b 89 de e8 75 d6 b5 ff e9 43 06 00 00 49 89 d5 48 89 d5 48 89 d8 48 29 e8 48 89 c1 48 c1 f9 02 48 c1 e8 3f <48> 01 c8 48 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 RSP: 0018:ffffc9000445ecd8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffffff90011ff8 RCX: 0000000000000006 RDX: ffffffff90011fe0 RSI: ffffffff90b348a4 RDI: ffffffff8bc1d180 RBP: ffffffff90011fe0 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8171a9f5 R12: ffffffff8b55d823 R13: ffffffff90011fe0 R14: ffffc9000445eda8 R15: 00000000000a55d8 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4147 [inline] slab_alloc_node mm/slub.c:4196 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4203 kmem_alloc_batch lib/debugobjects.c:371 [inline] fill_pool+0x100/0x570 lib/debugobjects.c:403 debug_objects_fill_pool lib/debugobjects.c:725 [inline] __debug_object_init+0x318/0x3c0 lib/debugobjects.c:737 debug_timer_init kernel/time/timer.c:830 [inline] debug_init kernel/time/timer.c:878 [inline] init_timer_key+0x41/0x2d0 kernel/time/timer.c:922 sctp_transport_init net/sctp/transport.c:75 [inline] sctp_transport_new+0x39e/0x640 net/sctp/transport.c:101 sctp_assoc_add_peer+0x260/0x13b0 net/sctp/associola.c:617 sctp_process_param net/sctp/sm_make_chunk.c:2576 [inline] sctp_process_init+0xe1e/0x2b60 net/sctp/sm_make_chunk.c:2396 sctp_cmd_process_init net/sctp/sm_sideeffect.c:706 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1389 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline] sctp_do_sm+0x17f5/0x5a20 net/sctp/sm_sideeffect.c:1169 sctp_assoc_bh_rcv+0x3f2/0x630 net/sctp/associola.c:1052 sctp_backlog_rcv+0x167/0x3f0 net/sctp/input.c:331 sk_backlog_rcv include/net/sock.h:1132 [inline] __release_sock+0x249/0x350 net/core/sock.c:3163 release_sock+0x5f/0x1f0 net/core/sock.c:3717 sctp_wait_for_connect+0x382/0x680 net/sctp/socket.c:9366 __sctp_connect+0xadd/0xd50 net/sctp/socket.c:1248 sctp_connect net/sctp/socket.c:4820 [inline] sctp_inet_connect+0x12e/0x1e0 net/sctp/socket.c:4835 __sys_connect_file net/socket.c:2038 [inline] __sys_connect+0x313/0x440 net/socket.c:2057 __do_sys_connect net/socket.c:2063 [inline] __se_sys_connect net/socket.c:2060 [inline] __ia32_sys_connect+0x7a/0x90 net/socket.c:2060 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xb4/0x110 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf70ae539 RSP: 002b:00000000f507d55c EFLAGS: 00000206 ORIG_RAX: 000000000000016a RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000080000000 RDX: 000000000000001c RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 rcu: rcu_preempt kthread starved for 7029 jiffies! g45621 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:27032 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0x165/0x360 kernel/sched/core.c:6860 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2046 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2248 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/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: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.15.0-rc5-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 RIP: 0010:lock_acquire+0x18d/0x360 kernel/locking/lockdep.c:5870 Code: 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 6b 31 d7 10 48 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e 41 5f <5d> c3 cc cc cc cc cc 65 8b 05 65 6d d7 10 85 c0 75 ce 65 8b 05 4a RSP: 0018:ffffc90000006b98 EFLAGS: 00000282 RAX: 1c5fcad986cc0500 RBX: ffffffff8a39e80e RCX: 1c5fcad986cc0500 RDX: 0000000000000000 RSI: ffffffff8d935a73 RDI: ffffffff8bc1d1e0 RBP: ffffffff8a39e80e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8a39e80e R12: ffff88803f7c531c R13: ffff88805d8e2000 R14: ffff88805d8e2000 R15: 1ffff92000000d88 FS: 0000000000000000(0000) GS:ffff8881260cb000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f0c77e84 CR3: 000000000dd36000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] net_generic+0x3a/0x240 include/net/netns/generic.h:45 is_vlan_arp net/bridge/br_netfilter_hooks.c:109 [inline] br_nf_forward_finish+0x1cd/0xe60 net/bridge/br_netfilter_hooks.c:642 NF_HOOK+0x618/0x6b0 include/linux/netfilter.h:314 br_nf_forward_ip+0x647/0x7e0 net/bridge/br_netfilter_hooks.c:719 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_slow+0xc2/0x220 net/netfilter/core.c:626 nf_hook include/linux/netfilter.h:269 [inline] NF_HOOK+0x215/0x3c0 include/linux/netfilter.h:312 __br_forward+0x41e/0x600 net/bridge/br_forward.c:115 deliver_clone net/bridge/br_forward.c:131 [inline] maybe_deliver+0xb5/0x160 net/bridge/br_forward.c:190 br_flood+0x31a/0x6a0 net/bridge/br_forward.c:237 br_handle_frame_finish+0x146c/0x1950 net/bridge/br_input.c:220 br_nf_hook_thresh+0x3bf/0x490 net/bridge/br_netfilter_hooks.c:-1 br_nf_pre_routing_finish_ipv6+0x948/0xd00 net/bridge/br_netfilter_ipv6.c:-1 NF_HOOK include/linux/netfilter.h:314 [inline] br_nf_pre_routing_ipv6+0x37e/0x6b0 net/bridge/br_netfilter_ipv6.c:184 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_bridge_pre net/bridge/br_input.c:282 [inline] br_handle_frame+0x97f/0x14c0 net/bridge/br_input.c:433 __netif_receive_skb_core+0x10de/0x4180 net/core/dev.c:5773 __netif_receive_skb_one_core net/core/dev.c:5885 [inline] __netif_receive_skb+0x72/0x380 net/core/dev.c:6000 process_backlog+0x60e/0x14f0 net/core/dev.c:6352 __napi_poll+0xc4/0x480 net/core/dev.c:7324 napi_poll net/core/dev.c:7388 [inline] net_rx_action+0x6ea/0xdf0 net/core/dev.c:7510 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:81 Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d c3 ea 11 00 f3 0f 1e fa fb f4 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffffff8dc07d80 EFLAGS: 000002c6 RAX: 1c5fcad986cc0500 RBX: ffffffff81974f28 RCX: 1c5fcad986cc0500 RDX: 0000000000000001 RSI: ffffffff8d74aa77 RDI: ffffffff8bc1d1e0 RBP: ffffffff8dc07ec0 R08: ffff8880b8832b5b R09: 1ffff1101710656b R10: dffffc0000000000 R11: ffffed101710656c R12: ffffffff8f7ed970 R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1b92a48 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:748 default_idle_call+0x74/0xb0 kernel/sched/idle.c:117 cpuidle_idle_call kernel/sched/idle.c:185 [inline] do_idle+0x1e8/0x510 kernel/sched/idle.c:325 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:423 rest_init+0x2de/0x300 init/main.c:743 start_kernel+0x470/0x4f0 init/main.c:1099 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:513 x86_64_start_kernel+0x66/0x70 arch/x86/kernel/head64.c:494 common_startup_64+0x13e/0x147 net_ratelimit: 14618 callbacks suppressed bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:4e:15:f5:33:06:ee, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:4e:15:f5:33:06:ee, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:4e:15:f5:33:06:ee, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:4e:15:f5:33:06:ee, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:4e:15:f5:33:06:ee, vlan:0) net_ratelimit: 18620 callbacks suppressed bridge0: received packet on veth1_to_bridge with own address as source address (addr:4e:15:f5:33:06:ee, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:4e:15:f5:33:06:ee, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:4e:15:f5:33:06:ee, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:4e:15:f5:33:06:ee, vlan:0) bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:4e:15:f5:33:06:ee, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)