syzbot

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:0c, vlan:0)
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P24701/2:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=168857, q=1361 ncpus=1)
task:syz.0.3614      state:R  running task     stack:26216 pid:24701 tgid:24701 ppid:18380  task_flags:0x20400040 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6961
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288
 irqentry_exit+0x36/0x90 kernel/entry/common.c:197
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unwind_next_frame+0x62e/0x20a0 arch/x86/kernel/unwind_orc.c:517
Code: 0f 85 0c 17 00 00 48 89 c8 4d 8b 7d 38 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 0f b6 34 10 48 8d 41 01 48 89 c7 48 c1 ef 03 <0f> b6 14 17 48 89 cf 83 e7 07 40 38 fe 40 0f 9e c7 40 84 f6 40 0f
RSP: 0018:ffffc9000458efb8 EFLAGS: 00000a07
RAX: ffffffff9140dc75 RBX: 0000000000000001 RCX: ffffffff9140dc74
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 1ffffffff2281b8e
RBP: ffffc9000458f0c0 R08: ffffffff9140dc78 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000006ada R12: ffffc9000458f0c8
R13: ffffc9000458f078 R14: 0000000000000005 R15: ffffc9000458f028
 __unwind_start+0x45f/0x7f0 arch/x86/kernel/unwind_orc.c:758
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0x73/0x100 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:548
 __call_rcu_common.constprop.0+0xa5/0xa10 kernel/rcu/tree.c:3123
 slab_free_hook mm/slub.c:2381 [inline]
 slab_free mm/slub.c:4680 [inline]
 kmem_cache_free+0x16d/0x4d0 mm/slub.c:4782
 mempool_free+0x102/0x750 mm/mempool.c:576
 bio_put_percpu_cache block/bio.c:801 [inline]
 bio_put+0x355/0x5b0 block/bio.c:820
 bio_endio+0x6bf/0x800 block/bio.c:1651
 blk_update_request+0x93e/0x15f0 block/blk-mq.c:989
 blk_mq_end_request+0x4f/0x90 block/blk-mq.c:1151
 blk_mq_complete_request block/blk-mq.c:1329 [inline]
 blk_mq_complete_request+0x88/0xb0 block/blk-mq.c:1326
 nullb_complete_cmd drivers/block/null_blk/main.c:1402 [inline]
 null_handle_cmd drivers/block/null_blk/main.c:1454 [inline]
 null_queue_rq+0xb69/0xfd0 drivers/block/null_blk/main.c:1693
 null_queue_rqs+0xe9/0x2f0 drivers/block/null_blk/main.c:1707
 __blk_mq_flush_list block/blk-mq.c:2828 [inline]
 __blk_mq_flush_list+0x9a/0xc0 block/blk-mq.c:2824
 blk_mq_dispatch_queue_requests+0x184/0x7b0 block/blk-mq.c:2873
 blk_mq_flush_plug_list+0x1f2/0x600 block/blk-mq.c:2961
 __blk_flush_plug+0x2c4/0x4b0 block/blk-core.c:1220
 blk_finish_plug block/blk-core.c:1247 [inline]
 blk_finish_plug+0x53/0xa0 block/blk-core.c:1244
 blkdev_writepages+0xe9/0x140 block/fops.c:484
 do_writepages+0x27a/0x600 mm/page-writeback.c:2634
 filemap_fdatawrite_wbc mm/filemap.c:386 [inline]
 filemap_fdatawrite_wbc+0x104/0x160 mm/filemap.c:376
 __filemap_fdatawrite_range+0xb9/0x100 mm/filemap.c:419
 filemap_write_and_wait_range mm/filemap.c:691 [inline]
 filemap_write_and_wait_range+0xa3/0x130 mm/filemap.c:682
 filemap_write_and_wait include/linux/pagemap.h:68 [inline]
 sync_blockdev block/bdev.c:260 [inline]
 sync_blockdev block/bdev.c:256 [inline]
 bdev_release+0x4d3/0x6d0 block/bdev.c:1126
 blkdev_release+0x15/0x20 block/fops.c:699
 __fput+0x402/0xb70 fs/file_table.c:468
 task_work_run+0x14d/0x240 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x3f6/0x490 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f102498ebe9
RSP: 002b:00007ffdeafd2468 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f1024bb7da0 RCX: 00007f102498ebe9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f1024bb7da0 R08: 000000000007be04 R09: 0000001eeafd275f
R10: 00007f1024bb7cb0 R11: 0000000000000246 R12: 000000000014eddd
R13: 00007f1024bb6090 R14: ffffffffffffffff R15: 00007ffdeafd2580
 </TASK>
rcu: rcu_preempt kthread starved for 751 jiffies! g168857 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:27784 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:7058
 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2285
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 14709 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:unwind_next_frame+0x684/0x20a0 arch/x86/kernel/unwind_orc.c:581
Code: 0f 95 c0 40 84 c6 0f 85 8a 16 00 00 4c 0f bf 31 4d 01 fe 0f b6 41 05 83 e0 07 3c 03 0f 84 9c 05 00 00 3c 04 0f 84 d5 04 00 00 <3c> 02 0f 84 4e 06 00 00 80 3d 35 17 29 0f 00 4d 8d 7d 34 0f 85 e5
RSP: 0018:ffffc90000a07ca8 EFLAGS: 00000293
RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffffffff91428440
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffc90000a07d60 R08: ffffffff91428444 R09: 0000000000000000
R10: 0000000000000005 R11: 000000000000829f R12: ffffc90000a07d68
R13: ffffc90000a07d18 R14: ffffc9000b8a7e80 R15: ffffc9000b8a7db8
FS:  0000000000000000(0000) GS:ffff8881247c3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f479698377c CR3: 0000000034e26000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:330 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:356
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4180 [inline]
 slab_alloc_node mm/slub.c:4229 [inline]
 kmem_cache_alloc_noprof+0x1cb/0x3b0 mm/slub.c:4236
 skb_ext_maybe_cow net/core/skbuff.c:6994 [inline]
 skb_ext_add+0xf8/0x7a0 net/core/skbuff.c:7068
 nf_bridge_unshare net/bridge/br_netfilter_hooks.c:169 [inline]
 br_nf_forward_ip.part.0+0x28/0x810 net/bridge/br_netfilter_hooks.c:684
 br_nf_forward_ip net/bridge/br_netfilter_hooks.c:679 [inline]
 br_nf_forward+0xf0f/0x1be0 net/bridge/br_netfilter_hooks.c:776
 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
 nf_hook_slow+0xbb/0x200 net/netfilter/core.c:623
 nf_hook+0x45e/0x780 include/linux/netfilter.h:273
 NF_HOOK include/linux/netfilter.h:316 [inline]
 __br_forward+0x1be/0x5b0 net/bridge/br_forward.c:115
 deliver_clone net/bridge/br_forward.c:131 [inline]
 br_flood+0x39c/0x650 net/bridge/br_forward.c:249
 br_handle_frame_finish+0xf2d/0x1ca0 net/bridge/br_input.c:221
 br_nf_hook_thresh+0x307/0x410 net/bridge/br_netfilter_hooks.c:1170
 br_nf_pre_routing_finish_ipv6+0x76a/0xfb0 net/bridge/br_netfilter_ipv6.c:154
 NF_HOOK include/linux/netfilter.h:318 [inline]
 br_nf_pre_routing_ipv6+0x3cd/0x8c0 net/bridge/br_netfilter_ipv6.c:184
 br_nf_pre_routing+0x860/0x15b0 net/bridge/br_netfilter_hooks.c:508
 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:283 [inline]
 br_handle_frame+0xad5/0x14b0 net/bridge/br_input.c:434
 __netif_receive_skb_core.constprop.0+0xa25/0x48c0 net/core/dev.c:5878
 __netif_receive_skb_one_core+0xb0/0x1e0 net/core/dev.c:5989
 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6104
 process_backlog+0x442/0x15e0 net/core/dev.c:6456
 __napi_poll.constprop.0+0xba/0x550 net/core/dev.c:7506
 napi_poll net/core/dev.c:7569 [inline]
 net_rx_action+0xa9f/0xfe0 net/core/dev.c:7696
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
 do_softirq kernel/softirq.c:480 [inline]
 do_softirq+0xb2/0xf0 kernel/softirq.c:467
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:407
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 cfg80211_put_bss+0x1b4/0x280 net/wireless/scan.c:3354
 ieee80211_rx_bss_put net/mac80211/scan.c:37 [inline]
 ieee80211_rx_bss_put+0x43/0x60 net/mac80211/scan.c:32
 ieee80211_rx_bss_info net/mac80211/ibss.c:1166 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1573 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x1a81/0x2fd0 net/mac80211/ibss.c:1600
 ieee80211_iface_process_skb net/mac80211/iface.c:1699 [inline]
 ieee80211_iface_work+0xe2e/0x1360 net/mac80211/iface.c:1753
 cfg80211_wiphy_work+0x2c7/0x580 net/wireless/core.c:435
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
net_ratelimit: 11212 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:6a:ba:05:27:5e:4b, 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 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:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:6a:ba:05:27:5e:4b, 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 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:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:6a:ba:05:27:5e:4b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
net_ratelimit: 12439 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 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:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:6a:ba:05:27:5e:4b, 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 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:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:6a:ba:05:27:5e:4b, 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 bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)