bridge0: port 4(dummy0) entered forwarding state
bridge0: topology change detected, propagating
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5613/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=307877, q=458 ncpus=1)
task:syz-executor state:R running task stack:22736 pid:5613 tgid:5613 ppid:5608 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7234
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7556
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x205/0xa00 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_is_held_type+0xf5/0x140 kernel/locking/lockdep.c:5945
Code: ff ff ff ff 65 0f c1 15 b9 04 ab 08 83 fa 01 8b 44 24 04 75 2d 9c 5a 80 e6 02 75 47 41 f7 c5 00 02 00 00 74 01 fb 48 83 c4 08 <5b> 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc e9 17 42 03 00 31 c0
RSP: 0018:ffffc900047af7e0 EFLAGS: 00000292
RAX: 0000000000000001 RBX: ffffffff8ebe8000 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff8e17ce80 RDI: ffffffff8c3fe580
RBP: ffff8880339dbe00 R08: 0000000000000006 R09: 0000000000001000
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff
R13: 0000000000000246 R14: ffff8880339dc9a0 R15: 0000000000000000
lookup_page_ext+0x6e/0x100 mm/page_ext.c:258
page_ext_iter_begin include/linux/page_ext.h:137 [inline]
__update_page_owner_free_handle.isra.0+0xe6/0x4b0 mm/page_owner.c:284
__reset_page_owner+0x93/0x190 mm/page_owner.c:321
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1406 [inline]
free_pages_prepare+0x586/0xd80 mm/page_alloc.c:1451
__free_contig_range_common+0x14f/0x250 mm/page_alloc.c:6897
__free_contig_range mm/page_alloc.c:6942 [inline]
free_pages_bulk+0x12a/0x200 mm/page_alloc.c:5257
vm_area_free_pages+0xad/0x2b0 mm/vmalloc.c:3461
vfree mm/vmalloc.c:3510 [inline]
vfree+0x107/0x750 mm/vmalloc.c:3484
__do_replace+0x77a/0x980 net/ipv4/netfilter/ip_tables.c:1088
do_replace net/ipv4/netfilter/ip_tables.c:1139 [inline]
do_ipt_set_ctl+0x95b/0xbc0 net/ipv4/netfilter/ip_tables.c:1634
nf_setsockopt+0x8d/0xf0 net/netfilter/nf_sockopt.c:101
ip_setsockopt+0xcb/0xf0 net/ipv4/ip_sockglue.c:1424
tcp_setsockopt+0xa7/0x100 net/ipv4/tcp.c:4179
do_sock_setsockopt+0xf3/0x1d0 net/socket.c:2368
__sys_setsockopt+0x119/0x190 net/socket.c:2393
__do_sys_setsockopt net/socket.c:2399 [inline]
__se_sys_setsockopt net/socket.c:2396 [inline]
__x64_sys_setsockopt+0xbd/0x160 net/socket.c:2396
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x840 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb06039f91a
RSP: 002b:00007ffe826a5b78 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffe826a5c00 RCX: 00007fb06039f91a
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00000000000002d8 R09: 0000000000000000
R10: 00007fb0605f1b20 R11: 0000000000000206 R12: 00007fb0605f1ac0
R13: 00007ffe826a5b9c R14: 0000000000000000 R15: 00007fb0605f2180
rcu: rcu_preempt kthread starved for 854 jiffies! g307877 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:28840 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7326
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 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: 0 UID: 0 PID: 3217 Comm: kworker/R-bat_e Tainted: G U L syzkaller #0 PREEMPT(full)
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: bat_events batadv_tt_purge
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x35/0x70 kernel/kcov.c:217
Code: 48 8b 34 24 65 48 8b 15 61 00 59 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 e9 91 84 b1 09 8b 82 24 17 00 00 <85> c0 74 f1 8b 82 f8 16 00 00 83 f8 02 75 e6 48 8b 8a 00 17 00 00
RSP: 0018:ffffc90000007140 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888159eb1000 RCX: ffffffff8a57f05d
RDX: ffff888032775d00 RSI: ffffffff8a57f457 RDI: ffff888032775d00
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888159eb1000
R13: 0000612e4fdd09e9 R14: ffff888159eb107f R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888123df3000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd4f2226bb5 CR3: 000000007761a000 CR4: 00000000003526f0
Call Trace:
validate_xmit_xfrm+0x457/0x13c0 net/xfrm/xfrm_device.c:194
validate_xmit_skb+0xade/0x15c0 net/core/dev.c:4072
__dev_queue_xmit+0x60c/0x4970 net/core/dev.c:4865
dev_queue_xmit include/linux/netdevice.h:3448 [inline]
br_dev_queue_push_xmit+0x361/0x530 net/bridge/br_forward.c:53
NF_HOOK include/linux/netfilter.h:318 [inline]
NF_HOOK include/linux/netfilter.h:312 [inline]
br_forward_finish+0x102/0x4d0 net/bridge/br_forward.c:66
NF_HOOK include/linux/netfilter.h:318 [inline]
NF_HOOK include/linux/netfilter.h:312 [inline]
__br_forward+0x6ba/0x970 net/bridge/br_forward.c:115
deliver_clone net/bridge/br_forward.c:131 [inline]
br_flood+0x372/0x7b0 net/bridge/br_forward.c:257
br_handle_frame_finish+0x1014/0x1fa0 net/bridge/br_input.c:229
nf_hook_bridge_pre net/bridge/br_input.c:313 [inline]
br_handle_frame+0x97f/0x1540 net/bridge/br_input.c:442
__netif_receive_skb_core.constprop.0+0x6c5/0x3530 net/core/dev.c:6099
__netif_receive_skb_one_core+0xb0/0x1e0 net/core/dev.c:6210
__netif_receive_skb+0x1f/0x120 net/core/dev.c:6325
process_backlog+0x37a/0x1580 net/core/dev.c:6676
__napi_poll.constprop.0+0xaf/0x450 net/core/dev.c:7735
napi_poll net/core/dev.c:7798 [inline]
net_rx_action+0xa40/0xf20 net/core/dev.c:7955
handle_softirqs+0x1ea/0x9b0 kernel/softirq.c:622
do_softirq kernel/softirq.c:523 [inline]
do_softirq+0xac/0xe0 kernel/softirq.c:510
__local_bh_enable_ip+0xf8/0x120 kernel/softirq.c:450
spin_unlock_bh include/linux/spinlock.h:396 [inline]
batadv_tt_local_purge+0x21c/0x3d0 net/batman-adv/translation-table.c:1366
batadv_tt_purge+0x8b/0xbd0 net/batman-adv/translation-table.c:3565
process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
rescuer_thread+0x905/0x14a0 kernel/workqueue.c:3629
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245