bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10346/1:b..l
rcu: (detected by 1, t=10504 jiffies, g=43357, q=2697 ncpus=2)
task:syz.2.1045 state:R running task stack:25608 pid:10346 tgid:10346 ppid:5634 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7284
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7606
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:unwind_next_frame+0x48e/0x2550 arch/x86/kernel/unwind_orc.c:520
Code: d8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 b4 19 00 00 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 bf 19 00 00 0f b6 43 01 <83> e0 07 0f 84 7c 16 00 00 83 f8 01 4c 8b 6c 24 50 49 bc 00 00 00
RSP: 0018:ffffc9000337f940 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff9116caac RCX: ffffffff90969040
RDX: ffffffff9116caa8 RSI: ffffffff9116caa8 RDI: ffffffff8c6dac20
RBP: ffffffff81b06693 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc9000337fa38 R11: ffffffff81b293f0 R12: dffffc0000000000
R13: ffffffff9116caad R14: ffffc9000337f9e8 R15: ffffffff90969040
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
slab_free_hook mm/slub.c:2709 [inline]
slab_free mm/slub.c:6508 [inline]
kmem_cache_free+0x45e/0x650 mm/slub.c:6635
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5d6e59e159
RSP: 002b:00007ffd58db9da8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f5d6e827da0 RCX: 00007f5d6e59e159
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f5d6e827da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f5d6e827cb0 R11: 0000000000000246 R12: 0000000000038b8c
R13: 00007f5d6e825fac R14: 000000000003893e R15: 00007f5d6e825fa0
rcu: rcu_preempt kthread starved for 641 jiffies! g43357 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:28112 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7376
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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: 1 UID: 0 PID: 6138 Comm: kworker/1:11 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events_power_efficient neigh_periodic_work
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:58 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:409 [inline]
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:419 [inline]
RIP: 0010:unwind_next_frame+0xb92/0x2550 arch/x86/kernel/unwind_orc.c:614
Code: e3 bf 00 4c 8b 04 24 49 8d 50 f8 4d 8b 6e 10 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 10 0f b6 04 01 84 c0 0f 85 3b 14 00 00 <41> 83 3e 00 0f 95 c0 49 39 d7 0f 96 c1 20 c1 49 39 d5 0f 97 c0 20
RSP: 0000:ffffc90000a17ea0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff92000142fea RCX: 1ffff92000142fe9
RDX: ffffc90000a18c48 RSI: 0000000000000002 RDI: ffffc90000a17f58
RBP: 1ffffffff2339e9f R08: ffffc90000a18c50 R09: 0000000000000000
R10: ffffc90000a17f98 R11: ffffffff81b293f0 R12: 1ffff92000142feb
R13: ffffc90000a19000 R14: ffffc90000a17f48 R15: ffffc90000a11000
FS: 0000000000000000(0000) GS:ffff888124dc4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3bb0a00218 CR3: 000000000eb48000 CR4: 00000000003526f0
Call Trace:
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4683 [inline]
slab_alloc_node mm/slub.c:4996 [inline]
kmem_cache_alloc_noprof+0x2b9/0x600 mm/slub.c:5010
skb_clone+0x212/0x3a0 net/core/skbuff.c:2119
deliver_clone net/bridge/br_forward.c:140 [inline]
br_flood_finish+0xbd/0x140 net/bridge/br_forward.c:237
br_flood+0x402/0x650 net/bridge/br_forward.c:350
br_handle_frame_finish+0x1119/0x1950 net/bridge/br_input.c:229
br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1
br_nf_pre_routing_finish_ipv6+0x90c/0xc40 net/bridge/br_netfilter_ipv6.c:-1
NF_HOOK include/linux/netfilter.h:325 [inline]
br_nf_pre_routing_ipv6+0x382/0x6f0 net/bridge/br_netfilter_ipv6.c:183
nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:291 [inline]
br_handle_frame+0x1329/0x1600 net/bridge/br_input.c:451
__netif_receive_skb_core+0x989/0x30c0 net/core/dev.c:6187
__netif_receive_skb_one_core net/core/dev.c:6298 [inline]
__netif_receive_skb net/core/dev.c:6413 [inline]
process_backlog+0x727/0x18b0 net/core/dev.c:6764
__napi_poll+0xaa/0x330 net/core/dev.c:7833
napi_poll net/core/dev.c:7896 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:8053
handle_softirqs+0x226/0x860 kernel/softirq.c:645
do_softirq+0x77/0xd0 kernel/softirq.c:546
__local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245