bridge0: received packet on veth0_to_bridge with own address as source address (addr:3a:35:0a:8e:ee:2e, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6266/1:b..l rcu: (detected by 1, t=10503 jiffies, g=15185, q=1080 ncpus=2) task:syz.2.60 state:R running task stack:26216 pid:6266 tgid:6265 ppid:5878 task_flags:0x400140 flags:0x00404006 Call Trace: context_switch kernel/sched/core.c:5397 [inline] __schedule+0x116a/0x5dd0 kernel/sched/core.c:6786 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7109 irqentry_exit+0x36/0x90 kernel/entry/common.c:307 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:lock_acquire+0x2c8/0x350 kernel/locking/lockdep.c:5834 Code: 8b 05 4c 79 11 0f 85 c0 0f 85 b6 fd ff ff b9 0a 00 00 00 ba 08 00 00 00 48 8d 74 24 08 48 89 df e8 fd cb ff ff e9 9a fd ff ff 73 dc 08 00 84 c0 0f 85 7f fd ff ff 80 3d 16 91 f9 0e 00 0f 85 RSP: 0018:ffffc9000b086d00 EFLAGS: 00000297 RAX: 0000000000000001 RBX: ffffffff8e5c4c80 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e5c4c80 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 00000000000102b9 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] class_rcu_constructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0xd1/0x20a0 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 save_stack+0x160/0x1f0 mm/page_owner.c:156 __set_page_owner+0x91/0x550 mm/page_owner.c:329 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419 folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2438 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1851 shmem_alloc_and_add_folio+0x499/0xc20 mm/shmem.c:1890 shmem_get_folio_gfp+0x67f/0x1600 mm/shmem.c:2536 shmem_fault+0x1fe/0xa30 mm/shmem.c:2737 __do_fault+0x10d/0x490 mm/memory.c:5169 do_shared_fault mm/memory.c:5654 [inline] do_fault mm/memory.c:5728 [inline] do_pte_missing mm/memory.c:4251 [inline] handle_pte_fault mm/memory.c:6069 [inline] __handle_mm_fault+0x374c/0x5490 mm/memory.c:6212 handle_mm_fault+0x589/0xd10 mm/memory.c:6381 faultin_page mm/gup.c:1186 [inline] __get_user_pages+0x589/0x3b80 mm/gup.c:1488 __get_user_pages_locked mm/gup.c:1754 [inline] faultin_page_range+0x249/0x980 mm/gup.c:1978 madvise_populate mm/madvise.c:974 [inline] madvise_do_behavior+0x268/0x3f0 mm/madvise.c:1731 do_madvise+0x161/0x230 mm/madvise.c:1826 __do_sys_madvise mm/madvise.c:1835 [inline] __se_sys_madvise mm/madvise.c:1833 [inline] __x64_sys_madvise+0xa9/0x110 mm/madvise.c:1833 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f164138e9a9 RSP: 002b:00007f163f1f6038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007f16415b5fa0 RCX: 00007f164138e9a9 RDX: 0000000000000017 RSI: ffffffffffff0005 RDI: 0000000000000000 RBP: 00007f1641410d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f16415b5fa0 R15: 00007ffea9bf0318 rcu: rcu_preempt kthread starved for 5416 jiffies! g15185 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:27368 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5397 [inline] __schedule+0x116a/0x5dd0 kernel/sched/core.c:6786 __schedule_loop kernel/sched/core.c:6864 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6879 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2054 rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2256 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 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 6.16.0-rc7-syzkaller-00140-gec2df4364666 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__in6_dev_get include/net/addrconf.h:347 [inline] RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:443 [inline] RIP: 0010:find_match+0x355/0x15d0 net/ipv6/route.c:781 Code: 44 89 e6 e8 dd 49 8a f7 45 85 e4 0f 85 cb fe ff ff e9 80 fd ff ff e8 8a 4e 8a f7 e8 b5 a5 31 ff 31 ff 89 c6 88 85 48 ff ff ff 56 49 8a f7 0f b6 85 48 ff ff ff 84 c0 0f 85 00 fe ff ff e8 62 RSP: 0018:ffffc90000a083a0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff8962ac46 RDX: ffff88801e6bda00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000a084a8 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88805ded50df R13: ffff88805ded50c8 R14: 1ffff92000141083 R15: ffff88807d430000 FS: 0000000000000000(0000) GS:ffff88812482d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4309c02583 CR3: 0000000077934000 CR4: 00000000003526f0 Call Trace: __find_rr_leaf+0x140/0xe00 net/ipv6/route.c:869 find_rr_leaf net/ipv6/route.c:890 [inline] rt6_select net/ipv6/route.c:934 [inline] fib6_table_lookup+0x57c/0xa30 net/ipv6/route.c:2232 ip6_pol_route+0x1cc/0x1230 net/ipv6/route.c:2268 pol_lookup_func include/net/ip6_fib.h:617 [inline] fib6_rule_lookup+0x536/0x720 net/ipv6/fib6_rules.c:120 ip6_route_input_lookup net/ipv6/route.c:2337 [inline] ip6_route_input+0x662/0xc00 net/ipv6/route.c:2640 ip6_rcv_finish_core.constprop.0+0x1a0/0x5d0 net/ipv6/ip6_input.c:66 ip6_rcv_finish net/ipv6/ip6_input.c:77 [inline] NF_HOOK include/linux/netfilter.h:317 [inline] NF_HOOK include/linux/netfilter.h:311 [inline] ipv6_rcv+0x1e8/0x680 net/ipv6/ip6_input.c:309 __netif_receive_skb_one_core+0x12d/0x1e0 net/core/dev.c:5977 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6090 process_backlog+0x442/0x15e0 net/core/dev.c:6442 __napi_poll.constprop.0+0xba/0x550 net/core/dev.c:7414 napi_poll net/core/dev.c:7478 [inline] net_rx_action+0xa9f/0xfe0 net/core/dev.c:7605 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82 Code: bb 70 02 c3 cc cc cc cc 0f 1f 00 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 d3 57 27 00 fb f4 8c fb 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 RSP: 0018:ffffc90000197df8 EFLAGS: 000002c6 RAX: 0000000000abdd97 RBX: 0000000000000001 RCX: ffffffff8b82bc69 RDX: 0000000000000000 RSI: ffffffff8de29d1f RDI: ffffffff8c155ee0 RBP: ffffed1003cd7b40 R08: 0000000000000001 R09: ffffed10170a6645 R10: ffff8880b853322b R11: 0000000000000001 R12: 0000000000000001 R13: ffff88801e6bda00 R14: ffffffff90a95d50 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:749 default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117 cpuidle_idle_call kernel/sched/idle.c:185 [inline] do_idle+0x391/0x510 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: 12619 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:3a:35:0a:8e:ee:2e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3a:35:0a:8e:ee:2e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3a:35:0a:8e:ee:2e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3a:35:0a:8e:ee:2e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3a:35:0a:8e:ee:2e, vlan:0) net_ratelimit: 15472 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:3a:35:0a:8e:ee:2e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3a:35:0a:8e:ee:2e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3a:35:0a:8e:ee:2e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3a:35:0a:8e:ee:2e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:3a:35:0a:8e:ee:2e, vlan:0)