bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P23892/1:b..l rcu: (detected by 0, t=10502 jiffies, g=142589, q=735 ncpus=1) task:syz.6.3913 state:R running task stack:23560 pid:23892 tgid:23892 ppid:21354 task_flags:0x40064c flags:0x00480001 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6929 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7256 irqentry_exit+0x36/0x90 kernel/entry/common.c:211 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:lock_acquire+0x2c8/0x350 kernel/locking/lockdep.c:5831 Code: 8b 05 9c 0a ea 0e 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 33 ec 08 00 84 c0 0f 85 7f fd ff ff 80 3d 20 59 d2 0e 00 0f 85 RSP: 0018:ffffc9000ae3ef28 EFLAGS: 00000297 RAX: 0000000000000000 RBX: ffffffff8e3c45e0 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e3c45e0 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 000000000000a781 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [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 __reset_page_owner+0x84/0x1a0 mm/page_owner.c:311 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1394 [inline] free_unref_folios+0xa31/0x1610 mm/page_alloc.c:2963 folios_put_refs+0x4be/0x750 mm/swap.c:1002 folio_batch_release include/linux/pagevec.h:101 [inline] shmem_undo_range+0x58f/0x1150 mm/shmem.c:1120 shmem_truncate_range mm/shmem.c:1232 [inline] shmem_evict_inode+0x3a1/0xbe0 mm/shmem.c:1360 evict+0x3e6/0x920 fs/inode.c:810 iput_final fs/inode.c:1914 [inline] iput.part.0+0x6a9/0xb00 fs/inode.c:1966 iput+0x35/0x40 fs/inode.c:1929 dentry_unlink_inode+0x29c/0x480 fs/dcache.c:466 __dentry_kill+0x1d0/0x600 fs/dcache.c:669 dput.part.0+0x4b1/0x9b0 fs/dcache.c:911 dput+0x1f/0x30 fs/dcache.c:901 __fput+0x51c/0xb70 fs/file_table.c:476 task_work_run+0x150/0x240 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x86f/0x2bf0 kernel/exit.c:966 do_group_exit+0xd3/0x2a0 kernel/exit.c:1107 get_signal+0x2671/0x26d0 kernel/signal.c:3034 arch_do_signal_or_restart+0x8f/0x790 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:40 [inline] exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] irqentry_exit_to_user_mode+0x176/0x310 kernel/entry/common.c:73 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x401000 RSP: 002b:000000000000000c EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00007fd48d7e6180 RCX: 00007fd48d58f6c9 RDX: 9999999999999999 RSI: 0000000000000004 RDI: 0000000000000000 RBP: 00007fd48d611f91 R08: 0000000000000009 R09: 0000000000000000 R10: ffffffff81000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd48d7e6218 R14: 00007fd48d7e6180 R15: 00007fff6705c128 rcu: rcu_preempt kthread starved for 408 jiffies! g142589 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:28568 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:7026 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083 rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 14758 Comm: kworker/u8:22 Tainted: G U syzkaller #0 PREEMPT(full) Tainted: [U]=USER Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker RIP: 0010:rcu_lockdep_current_cpu_online+0x11/0x150 kernel/rcu/tree.c:4030 Code: 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 8b 15 d5 d8 ff 11 81 e2 00 00 f0 00 01 00 00 00 75 0a 8b 15 4e eb e0 0e 85 d2 75 05 c3 cc cc cc cc RSP: 0018:ffffc900000074e0 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffff888078861800 RCX: ffffffff8a08e05b RDX: 0000000000000000 RSI: ffffffff8bf07540 RDI: ffffffff8dcceee0 RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001 R13: ffffc900000077f8 R14: 0000000000000000 R15: ffff88805d4b48c8 FS: 0000000000000000(0000) GS:ffff888124a0d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055bcdaeb1088 CR3: 000000006b136000 CR4: 00000000003526f0 Call Trace: rcu_read_lock_held_common kernel/rcu/update.c:113 [inline] rcu_read_lock_held+0x27/0x50 kernel/rcu/update.c:349 __find_rr_leaf+0x36c/0xe00 net/ipv6/route.c:833 find_rr_leaf net/ipv6/route.c:889 [inline] rt6_select net/ipv6/route.c:933 [inline] fib6_table_lookup+0x57c/0xa30 net/ipv6/route.c:2233 ip6_pol_route+0x1cc/0x1230 net/ipv6/route.c:2269 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:2338 [inline] ip6_route_input+0x662/0xc70 net/ipv6/route.c:2641 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:318 [inline] NF_HOOK include/linux/netfilter.h:312 [inline] ipv6_rcv+0x1e8/0x650 net/ipv6/ip6_input.c:311 __netif_receive_skb_one_core+0x12d/0x1e0 net/core/dev.c:6079 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6192 process_backlog+0x439/0x15e0 net/core/dev.c:6544 __napi_poll.constprop.0+0xba/0x550 net/core/dev.c:7594 napi_poll net/core/dev.c:7657 [inline] net_rx_action+0x97f/0xef0 net/core/dev.c:7784 handle_softirqs+0x219/0x8e0 kernel/softirq.c:622 do_softirq kernel/softirq.c:523 [inline] do_softirq+0xb2/0xf0 kernel/softirq.c:510 __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:450 local_bh_enable include/linux/bottom_half.h:33 [inline] fpregs_unlock arch/x86/include/asm/fpu/api.h:77 [inline] kernel_fpu_end+0x5e/0x70 arch/x86/kernel/fpu/core.c:479 blake2s_compress+0x7b/0xe0 lib/crypto/x86/blake2s.h:44 blake2s_update+0xef/0x360 lib/crypto/blake2s.c:126 blake2s.constprop.0+0xb1/0x100 include/crypto/blake2s.h:100 compute_mac1 drivers/net/wireguard/cookie.c:80 [inline] wg_cookie_add_mac_to_packet+0x52/0x1c0 drivers/net/wireguard/cookie.c:163 wg_packet_send_handshake_initiation+0x1c4/0x360 drivers/net/wireguard/send.c:35 wg_packet_handshake_send_worker+0x1c/0x30 drivers/net/wireguard/send.c:51 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263 process_scheduled_works kernel/workqueue.c:3346 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 net_ratelimit: 4747 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) net_ratelimit: 6004 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:ca:e4:7f:be:bf:08, vlan:0)