bridge0: received packet on veth0_to_bridge with own address as source address (addr:4a:59:9c:91:1b:43, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P18784/1:b..l rcu: (detected by 1, t=10503 jiffies, g=346881, q=1256 ncpus=2) task:syz-executor state:R running task stack:20256 pid:18784 tgid:18784 ppid:18736 flags:0x00004002 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:rcu_is_watching+0x67/0xb0 kernel/rcu/tree.c:738 Code: 89 f7 e8 5c 4d 85 00 48 c7 c3 d8 7c 03 00 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 22 8b 03 65 ff 0d b1 5c 88 7e <74> 10 83 e0 04 c1 e8 02 5b 41 5e 41 5f c3 cc cc cc cc e8 a2 3f 85 RSP: 0018:ffffc9000c007340 EFLAGS: 00000286 RAX: 0000000000337844 RBX: ffff8880b8737cd8 RCX: ffffffff81711774 RDX: 0000000000000000 RSI: ffffffff8c614ac0 RDI: ffffffff8c614a80 RBP: ffffc9000c0074a8 R08: ffffffff901e3877 R09: 1ffffffff203c70e R10: dffffc0000000000 R11: fffffbfff203c70f R12: 1ffff92001800e74 R13: dffffc0000000000 R14: ffffffff8e339a58 R15: dffffc0000000000 trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0xe3/0x550 kernel/locking/lockdep.c:5820 rcu_lock_acquire include/linux/rcupdate.h:337 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] page_ext_get+0x3d/0x2a0 mm/page_ext.c:525 __reset_page_owner+0x30/0x430 mm/page_owner.c:290 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_folios+0xf37/0x1a20 mm/page_alloc.c:2704 folios_put_refs+0x76c/0x860 mm/swap.c:962 folio_batch_release include/linux/pagevec.h:101 [inline] shmem_undo_range+0x64c/0x1cf0 mm/shmem.c:1040 shmem_truncate_range mm/shmem.c:1152 [inline] shmem_evict_inode+0x29b/0xa80 mm/shmem.c:1280 evict+0x4e8/0x9a0 fs/inode.c:796 do_unlinkat+0x512/0x830 fs/namei.c:4594 __do_sys_unlink fs/namei.c:4635 [inline] __se_sys_unlink fs/namei.c:4633 [inline] __x64_sys_unlink+0x47/0x50 fs/namei.c:4633 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: 0033:0x7fd25577ddc7 RSP: 002b:00007fd255a5ecc8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd25577ddc7 RDX: 00007fd255a5ecf0 RSI: 00007fd255a5ed80 RDI: 00007fd255a5ed80 RBP: 00007fd255a5ed80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000206 R12: 00007fd255a5fe00 R13: 00007fd2557f15fc R14: 00000000001c06d8 R15: 00007fd255a5fe40 rcu: rcu_preempt kthread starved for 6215 jiffies! g346881 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:25976 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.12.0-syzkaller-09435-g2c22dc1ee3a1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:kfree_skbmem+0x67/0x1c0 net/core/skbuff.c:1148 Code: 48 c7 c6 00 86 cd 8f e8 17 46 02 f8 83 fb 01 74 33 85 db 75 71 e8 89 40 02 f8 48 c7 c0 20 5d 66 8e 48 c1 e8 03 42 80 3c 20 00 <74> 0c 48 c7 c7 20 5d 66 8e e8 9b 28 6d f8 48 8b 3d 64 c0 d2 04 e9 RSP: 0018:ffffc90000157518 EFLAGS: 00000246 RAX: 1ffffffff1cccba4 RBX: 0000000000000000 RCX: ffff88801d2bda00 RDX: 0000000000000100 RSI: ffffffff8fcd8600 RDI: 0000000000000000 RBP: ffffc90000157610 R08: 0000000000000005 R09: ffffffff89939c89 R10: 0000000000000002 R11: ffff88801d2bda00 R12: dffffc0000000000 R13: ffff8881522d1000 R14: 0000000000000000 R15: ffff8881522d1000 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ca7195cd88 CR3: 000000007fffc000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kfree_skb_reason include/linux/skbuff.h:1263 [inline] kfree_skb include/linux/skbuff.h:1272 [inline] ip6_mc_input+0xa1f/0xc30 net/ipv6/ip6_input.c:587 NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314 __netif_receive_skb_one_core net/core/dev.c:5672 [inline] __netif_receive_skb+0x1ea/0x650 net/core/dev.c:5785 process_backlog+0x662/0x15b0 net/core/dev.c:6117 __napi_poll+0xcb/0x490 net/core/dev.c:6877 napi_poll net/core/dev.c:6946 [inline] net_rx_action+0x89b/0x1240 net/core/dev.c:7068 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554 run_ksoftirqd+0xca/0x130 kernel/softirq.c:943 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: 24814 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:4a:59:9c:91:1b:43, 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:4a:59:9c:91:1b:43, 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:4a:59:9c:91:1b:43, 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:4a:59:9c:91:1b:43, 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:4a:59:9c:91:1b:43, vlan:0) net_ratelimit: 28893 callbacks suppressed bridge0: received packet on veth0_to_bridge with own address as source address (addr:4a:59:9c:91:1b:43, 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:4a:59:9c:91:1b:43, 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:4a:59:9c:91:1b:43, 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:4a:59:9c:91:1b:43, 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:4a:59:9c:91:1b:43, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)