rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=66953, q=979 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 8928 (4295001926-4294992998), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 8929 jiffies! g66953 f0x2 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:27112 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x15ae/0x4660 kernel/sched/core.c:6701
 schedule+0xbd/0x170 kernel/sched/core.c:6775
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 16164 Comm: syz.0.2525 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:__dev_queue_xmit+0x1751/0x37e0 net/core/dev.c:4517
Code: 00 4b c7 44 3d 10 00 00 00 00 4b c7 44 3d 18 00 00 00 00 65 48 8b 0c 25 28 00 00 00 48 3b 8c 24 00 02 00 00 0f 85 4c 0c 00 00 <48> 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 db 24 02 f9 e9 0d
RSP: 0018:ffffc90000006780 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0781f5bc3ec53300
RDX: dffffc0000000000 RSI: ffffffff8acacfe0 RDI: ffffffff8b1d5160
RBP: ffffc900000069d0 R08: ffffffff91ff152f R09: 1ffffffff23fe2a5
R10: dffffc0000000000 R11: fffffbfff23fe2a6 R12: ffffffff888556e2
R13: 1ffff92000000d10 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f3c0df386c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000003 CR3: 0000000068593000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 dev_queue_xmit include/linux/netdevice.h:3170 [inline]
 br_dev_queue_push_xmit+0x6b7/0x880 net/bridge/br_forward.c:53
 NF_HOOK+0x66e/0x700 include/linux/netfilter.h:304
 br_nf_post_routing+0xa3b/0xec0 net/bridge/br_netfilter_hooks.c:981
 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
 nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
 nf_hook include/linux/netfilter.h:259 [inline]
 NF_HOOK+0x23e/0x3e0 include/linux/netfilter.h:302
 br_forward_finish+0xd3/0x130 net/bridge/br_forward.c:66
 br_nf_hook_thresh net/bridge/br_netfilter_hooks.c:1188 [inline]
 br_nf_forward_finish+0xa69/0xe90 net/bridge/br_netfilter_hooks.c:688
 NF_HOOK+0x66e/0x700 include/linux/netfilter.h:304
 br_nf_forward_ip+0xc78/0x10d0 net/bridge/br_netfilter_hooks.c:758
 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
 nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
 nf_hook include/linux/netfilter.h:259 [inline]
 NF_HOOK+0x23e/0x3e0 include/linux/netfilter.h:302
 __br_forward+0x433/0x610 net/bridge/br_forward.c:115
 br_handle_frame_finish+0xf2d/0x15c0 net/bridge/br_input.c:215
 br_nf_hook_thresh+0x3cd/0x4a0 net/bridge/br_netfilter_hooks.c:1188
 br_nf_pre_routing_finish_ipv6+0x9e5/0xd20 net/bridge/br_netfilter_ipv6.c:-1
 NF_HOOK include/linux/netfilter.h:304 [inline]
 br_nf_pre_routing_ipv6+0x34d/0x6a0 net/bridge/br_netfilter_ipv6.c:184
 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:277 [inline]
 br_handle_frame+0x1240/0x14d0 net/bridge/br_input.c:424
 __netif_receive_skb_core+0xf94/0x3ac0 net/core/dev.c:5565
 __netif_receive_skb_one_core net/core/dev.c:5669 [inline]
 __netif_receive_skb+0x74/0x290 net/core/dev.c:5785
 process_backlog+0x380/0x710 net/core/dev.c:6113
 __napi_poll+0xbb/0x460 net/core/dev.c:6675
 napi_poll net/core/dev.c:6742 [inline]
 net_rx_action+0x65f/0xcc0 net/core/dev.c:6878
 handle_softirqs+0x27d/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:finish_task_switch+0x267/0x8f0 kernel/sched/core.c:5256
Code: 35 09 85 c0 0f 84 30 01 00 00 48 85 db 0f 85 4f 01 00 00 0f 1f 44 00 00 4c 89 e7 e8 e3 e9 3e 09 e8 2e 28 30 00 fb 4c 8b 65 b8 <49> 8d bc 24 00 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0
RSP: 0018:ffffc9000469f4a0 EFLAGS: 00000286
RAX: 0781f5bc3ec53300 RBX: 0000000000000000 RCX: 0781f5bc3ec53300
RDX: dffffc0000000000 RSI: ffffffff8acacfe0 RDI: ffffffff8b1d5160
RBP: ffffc9000469f4f0 R08: ffffffff91ff152f R09: 1ffffffff23fe2a5
R10: dffffc0000000000 R11: fffffbfff23fe2a6 R12: ffff88802ce20000
R13: 1ffff110171879a1 R14: dffffc0000000000 R15: ffff8880b8c3cd08
 context_switch kernel/sched/core.c:5385 [inline]
 __schedule+0x15b6/0x4660 kernel/sched/core.c:6701
 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7011
 irqentry_exit+0x67/0x70 kernel/entry/common.c:441
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:preempt_schedule+0x0/0xd0 kernel/sched/core.c:6885
Code: 4c 89 f7 e8 a2 15 45 f7 eb af 66 0f 1f 00 bf 01 00 00 00 e8 62 9e c1 f6 e8 fd fd ff ff bf 01 00 00 00 e8 b3 9c c1 f6 c3 66 90 <f3> 0f 1e fa 55 48 89 e5 41 56 53 48 83 e4 e0 48 83 ec 60 65 48 8b
RSP: 0018:ffffc9000469f880 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000a02 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8acacfe0 RDI: 00000000ffffffff
RBP: ffffc9000469f8d0 R08: ffffffff91ff152f R09: 1ffffffff23fe2a5
R10: dffffc0000000000 R11: fffffbfff23fe2a6 R12: dffffc0000000000
R13: ffff88805a078000 R14: ffffffff98323638 R15: 1ffff920008d3f1c
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0x111/0x120 kernel/locking/spinlock.c:194
 __debug_check_no_obj_freed lib/debugobjects.c:1054 [inline]
 debug_check_no_obj_freed+0x47b/0x520 lib/debugobjects.c:1075
 free_pages_prepare mm/page_alloc.c:1188 [inline]
 free_unref_page_prepare+0x1ed/0x8f0 mm/page_alloc.c:2366
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459
 __slab_free+0x35a/0x400 mm/slub.c:3736
 qlink_free mm/kasan/quarantine.c:166 [inline]
 qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185
 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770
 slab_alloc_node mm/slub.c:3495 [inline]
 __kmem_cache_alloc_node+0x194/0x250 mm/slub.c:3534
 __do_kmalloc_node mm/slab_common.c:1006 [inline]
 __kmalloc+0xa7/0x240 mm/slab_common.c:1020
 kmalloc include/linux/slab.h:604 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 lsm_sock_alloc security/security.c:4581 [inline]
 security_sk_alloc+0x4b/0x130 security/security.c:4600
 sk_prot_alloc+0x101/0x210 net/core/sock.c:2103
 sk_alloc+0x3a/0x350 net/core/sock.c:2156
 unix_create1+0xb0/0x780 net/unix/af_unix.c:-1
 unix_create+0x14a/0x1f0 net/unix/af_unix.c:1084
 __sock_create+0x49e/0x940 net/socket.c:1571
 sock_create net/socket.c:1627 [inline]
 __sys_socketpair+0x236/0x550 net/socket.c:1782
 __do_sys_socketpair net/socket.c:1831 [inline]
 __se_sys_socketpair net/socket.c:1828 [inline]
 __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1828
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3c0cf9e559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3c0df38028 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f3c0d225fa0 RCX: 00007f3c0cf9e559
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000001
RBP: 00007f3c0d035ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 00002000000016c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3c0d226038 R14: 00007f3c0d225fa0 R15: 00007ffca2bd5818
 </TASK>
net_ratelimit: 2938 callbacks suppressed
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:76:ac:8f:3d:ec:a9, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:76:ac:8f:3d:ec:a9, 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 bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
net_ratelimit: 14184 callbacks suppressed
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 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:76:ac:8f:3d:ec:a9, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:76:ac:8f:3d:ec:a9, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)