bridge0: received packet on veth0_to_bridge with own address as source address (addr:be:f8:04:9e:63:7d, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P16928/1:b..l rcu: (detected by 0, t=10503 jiffies, g=39549, q=746 ncpus=2) task:syz-executor state:R running task stack:26752 pid:16928 tgid:16928 ppid:5845 flags:0x00000002 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7078 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__legitimize_mnt+0x0/0x190 fs/namespace.c:741 Code: 05 95 0a 41 0c 48 c7 c7 f8 57 61 8e e9 99 3c ad 09 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <66> 0f 1f 00 55 41 57 41 56 41 55 41 54 53 89 f5 49 89 ff e8 d8 10 RSP: 0018:ffffc9000499fa20 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffff92000933f68 RCX: 1ffff92000933f71 RDX: 0000000000000000 RSI: 0000000000000e60 RDI: ffff88803140ec60 RBP: 0000000000000e60 R08: ffffffff821b78c6 R09: ffffffff821b37c0 R10: 0000000000000002 R11: ffff8880718c9e00 R12: 1ffff92000933f69 R13: ffffc9000499fb40 R14: ffffc9000499fb48 R15: dffffc0000000000 __legitimize_path fs/namei.c:769 [inline] legitimize_path fs/namei.c:786 [inline] try_to_unlazy+0xf3/0x5b0 fs/namei.c:847 complete_walk+0x118/0x370 fs/namei.c:956 path_parentat fs/namei.c:2683 [inline] __filename_parentat+0x2c7/0x740 fs/namei.c:2705 filename_parentat fs/namei.c:2723 [inline] filename_create+0xf6/0x540 fs/namei.c:4061 do_symlinkat+0xf9/0x3a0 fs/namei.c:4688 __do_sys_symlinkat fs/namei.c:4711 [inline] __se_sys_symlinkat fs/namei.c:4708 [inline] __x64_sys_symlinkat+0x95/0xb0 fs/namei.c:4708 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f68643852a7 RSP: 002b:00007ffea3f117d8 EFLAGS: 00000206 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f68643852a7 RDX: 00007f6864403230 RSI: 00000000ffffff9c RDI: 00007ffea3f11860 RBP: 00007ffea3f1180c R08: 0000000000000017 R09: 00007ffea3f11527 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000032 R13: 00000000000539e9 R14: 00007ffea3f11860 R15: 00007ffea3f11860 rcu: rcu_preempt kthread starved for 7793 jiffies! g39549 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:25848 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.13.0-rc2-syzkaller-00456-gd22f955cc2cb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 RIP: 0010:br_fdb_update+0x150/0x740 net/bridge/br_fdb.c:895 Code: 00 00 49 8d bc 24 a8 00 00 00 41 0f b7 d6 48 8b 74 24 10 89 54 24 1c e8 5e a4 ff ff 48 85 c0 0f 84 89 02 00 00 48 89 44 24 08 <4c> 8d 70 28 4c 89 f7 be 08 00 00 00 e8 af d9 74 f7 4c 89 f0 48 c1 RSP: 0018:ffffc900001e6c60 EFLAGS: 00000282 RAX: ffff888063c1e780 RBX: 0000000000007530 RCX: ffff88801d2f8000 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900001e6d30 R08: ffffffff8a909051 R09: 1ffff9200003cd7c R10: dffffc0000000000 R11: fffff5200003cd7d R12: ffff888034780d80 R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff9200003cd94 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555563540808 CR3: 000000000e736000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: br_handle_frame_finish+0x739/0x1fe0 net/bridge/br_input.c:141 br_nf_hook_thresh net/bridge/br_netfilter_hooks.c:1198 [inline] br_nf_pre_routing_finish+0x15c8/0x1fd0 net/bridge/br_netfilter_hooks.c:453 NF_HOOK+0x700/0x7c0 include/linux/netfilter.h:314 br_nf_pre_routing+0xead/0x1470 net/bridge/br_netfilter_hooks.c:562 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_bridge_pre net/bridge/br_input.c:277 [inline] br_handle_frame+0x9fd/0x1530 net/bridge/br_input.c:424 __netif_receive_skb_core+0x14eb/0x4690 net/core/dev.c:5566 __netif_receive_skb_one_core net/core/dev.c:5670 [inline] __netif_receive_skb+0x12f/0x650 net/core/dev.c:5785 process_backlog+0x662/0x15b0 net/core/dev.c:6117 __napi_poll+0xcb/0x490 net/core/dev.c:6883 napi_poll net/core/dev.c:6952 [inline] net_rx_action+0x89b/0x1240 net/core/dev.c:7074 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561 run_ksoftirqd+0xca/0x130 kernel/softirq.c:950 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 net_ratelimit: 27182 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:be:f8:04:9e:63:7d, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:be:f8:04:9e:63:7d, 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:be:f8:04:9e:63:7d, 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:be:f8:04:9e:63:7d, 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:be:f8:04:9e:63:7d, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) net_ratelimit: 28002 callbacks suppressed 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:be:f8:04:9e:63:7d, 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:be:f8:04:9e:63:7d, 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:be:f8:04:9e:63:7d, 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:be:f8:04:9e:63:7d, 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:be:f8:04:9e:63:7d, vlan:0)