INFO: rcu detected stall in br_handle_frame

Status: upstream: reported on 2025/11/21 04:49
Reported-by: syzbot+a0b26fcabafa4609b88c@syzkaller.appspotmail.com
First crash: 333d, last: 1d22h
▶ ▼ Similar bugs (16)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in br_handle_frame (5) bridge 1 syz 24 710d 738d 28/29 fixed on 2024/11/12 23:31
linux-4.14 INFO: rcu detected stall in br_handle_frame (3) 1 1 2211d 2211d 0/1 auto-closed as invalid on 2021/01/28 07:46
upstream INFO: rcu detected stall in br_handle_frame 1 syz, C done 341 2591d 2596d 13/29 fixed on 2019/10/09 10:54
upstream INFO: rcu detected stall in br_handle_frame (2) net 1 syz, C done 2 2496d 2492d 15/29 fixed on 2020/02/18 14:31
upstream INFO: rcu detected stall in br_handle_frame (3) bridge 1 1 1921d 1921d 0/29 auto-closed as invalid on 2021/10/15 13:41
linux-4.14 INFO: rcu detected stall in br_handle_frame (2) 1 syz, C done 1 2496d 2496d 1/1 fixed on 2020/01/19 15:05
linux-4.14 INFO: rcu detected stall in br_handle_frame 1 syz, C done 15 2588d 2600d 1/1 fixed on 2019/12/07 19:24
linux-4.19 INFO: rcu detected stall in br_handle_frame (2) 1 syz, C error 31 1356d 2196d 0/1 upstream: reported C repro on 2020/10/14 18:56
linux-4.19 INFO: rcu detected stall in br_handle_frame 1 syz, C done 41 2588d 2601d 1/1 fixed on 2019/12/07 19:18
linux-6.1 INFO: rcu detected stall in br_handle_frame (2) 1 5 192d 378d 0/3 auto-obsoleted due to no activity on 2026/07/20 06:55
linux-5.15 INFO: rcu detected stall in br_handle_frame origin:upstream 1 syz, C inconclusive 3 334d 985d 0/3 upstream: reported C repro on 2024/02/08 13:52
upstream INFO: rcu detected stall in br_handle_frame (6) prio:normal netfilter bridge 1 syz, C error error 196 12h19m 279d 0/29 upstream: reported C repro on 2026/01/13 18:06
linux-6.1 INFO: rcu detected stall in br_handle_frame 1 2 784d 866d 0/3 auto-obsoleted due to no activity on 2024/12/04 21:21
upstream INFO: rcu detected stall in br_handle_frame (4) kernel 1 1 1760d 1760d 0/29 closed as invalid on 2022/02/08 10:10
android-5-15 BUG: soft lockup in br_handle_frame 1 2 793d 799d 0/2 auto-obsoleted due to no activity on 2024/11/16 05:31
upstream INFO: task hung in addrconf_dad_work (5) prio:normal net 1 syz, C done 3125 1h10m 813d 0/29 upstream: reported C repro on 2024/07/29 15:23

Sample crash report:
bridge0: received packet on veth0_to_bridge with own address as source address (addr:42:51:30:29:28:ab, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:42:51:30:29:28:ab, vlan:0)
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10319 ticks this GP) idle=aa4c/1/0x4000000000000000 softirq=33507/33513 fqs=8
rcu: 	(t=10500 jiffies g=37369 q=215 ncpus=2)
rcu: rcu_preempt kthread starved for 5529 jiffies! g37369 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:27528 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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 9912 Comm: syz.1.898 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:lock_class_cache_is_valid kernel/locking/lockdep.c:965 [inline]
RIP: 0010:__lock_acquire+0x25e/0x7eb0 kernel/locking/lockdep.c:5041
Code: 77 30 4c 8d 6b 40 4c 89 e8 48 c1 e8 03 42 80 3c 00 00 74 12 4c 89 ef e8 20 d1 77 00 49 b8 00 00 00 00 00 fc ff df 49 8b 45 00 <4d> 01 e7 4c 39 f8 74 2b 45 31 ed 48 8b bc 24 88 00 00 00 44 89 f6
RSP: 0018:ffffc900001ee2e0 EFLAGS: 00000046
RAX: ffffffff98139ae0 RBX: ffffffff9195ae90 RCX: 00000000000001ad
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8df320e0
RBP: ffffc900001ee528 R08: dffffc0000000000 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff1ed8b5e R12: 0000000000000000
R13: ffffffff9195aed0 R14: 0000000000000000 R15: ffffffff98139ae0
FS:  00007fc9efbd16c0(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8001b964e8 CR3: 000000003ddb0000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5790
 rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
 rcu_read_lock include/linux/rcupdate.h:786 [inline]
 __task_pid_nr_ns+0x48/0x470 kernel/pid.c:500
 perf_event_pid_type kernel/events/core.c:1361 [inline]
 perf_event_tid kernel/events/core.c:1375 [inline]
 __perf_event_header__init_id+0x1c3/0x470 kernel/events/core.c:7239
 perf_prepare_sample+0x131/0x1e50 kernel/events/core.c:7778
 __perf_event_output kernel/events/core.c:7974 [inline]
 perf_event_output_forward+0x187/0x3e0 kernel/events/core.c:7995
 __perf_event_overflow+0x461/0x660 kernel/events/core.c:9720
 perf_event_overflow kernel/events/core.c:9741 [inline]
 perf_swevent_hrtimer+0x437/0x610 kernel/events/core.c:11230
 __run_hrtimer kernel/time/hrtimer.c:1754 [inline]
 __hrtimer_run_queues+0x4e8/0xc10 kernel/time/hrtimer.c:1818
 hrtimer_interrupt+0x39d/0x980 kernel/time/hrtimer.c:1880
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1088
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lock_acquire+0x208/0x420 kernel/locking/lockdep.c:5794
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc900001eef20 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0f36a3bc9539e400
RDX: 0000000000000000 RSI: ffffffff8acae160 RDI: ffffffff8b1d5160
RBP: ffffc900001ef030 R08: dffffc0000000000 R09: 1ffffffff23fe2a0
R10: dffffc0000000000 R11: fffffbfff23fe2a1 R12: 1ffff9200003ddf0
R13: ffffffff8df320e0 R14: 0000000000000246 R15: dffffc0000000000
 rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
 rcu_read_lock include/linux/rcupdate.h:786 [inline]
 is_bpf_text_address+0x47/0x2a0 kernel/bpf/core.c:742
 kernel_text_address+0xa0/0xd0 kernel/extable.c:125
 __kernel_text_address+0xd/0x30 kernel/extable.c:79
 unwind_get_return_address+0x5d/0xc0 arch/x86/kernel/unwind_orc.c:369
 arch_stack_walk+0x11d/0x190 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1811 [inline]
 slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
 slab_free mm/slub.c:3830 [inline]
 kmem_cache_free+0xf8/0x290 mm/slub.c:3852
 packet_rcv_spkt+0x42e/0x590 net/packet/af_packet.c:-1
 dev_queue_xmit_nit+0xb0c/0xba0 net/core/dev.c:2390
 xmit_one net/core/dev.c:3646 [inline]
 dev_hard_start_xmit+0x150/0x790 net/core/dev.c:3666
 __dev_queue_xmit+0x1be8/0x37e0 net/core/dev.c:4479
 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
 deliver_clone net/bridge/br_forward.c:131 [inline]
 maybe_deliver+0xb5/0x150 net/bridge/br_forward.c:191
 br_flood+0x317/0x670 net/bridge/br_forward.c:237
 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:__sanitizer_cov_trace_pc+0x57/0x60 kernel/kcov.c:228
Code: 00 74 2c 8b 91 00 16 00 00 83 fa 02 75 21 48 8b 91 08 16 00 00 48 8b 32 48 8d 7e 01 8b 89 04 16 00 00 48 39 cf 73 08 48 89 3a <48> 89 44 f2 08 c3 0f 1f 00 f3 0f 1e fa 48 8b 04 24 65 48 8b 15 e0
RSP: 0018:ffffc9000c74f000 EFLAGS: 00000283
RAX: ffffffff813321d1 RBX: ffffc9000c74f0c0 RCX: 0000000000080000
RDX: ffffc9000c899000 RSI: 0000000000002d3a RDI: 0000000000002d3b
RBP: ffffc9000c74f090 R08: 0000000000001e00 R09: 0000000000000000
R10: ffffc9000c74f140 R11: fffffbfff1ed8b5e R12: ffff888029be5a00
R13: 1ffff920018e9e84 R14: ffffffff81762b60 R15: 0000000000000000
 arch_stack_walk+0x31/0x190 arch/x86/kernel/stacktrace.c:17
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
 __call_rcu_common kernel/rcu/tree.c:2721 [inline]
 call_rcu+0x153/0x900 kernel/rcu/tree.c:2837
 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:spin_unlock_bh include/linux/spinlock.h:-1 [inline]
RIP: 0010:netif_addr_unlock_bh include/linux/netdevice.h:4621 [inline]
RIP: 0010:ieee80211_do_stop+0x59a/0x2030 net/mac80211/iface.c:549
Code: fe 48 89 df e8 b7 27 95 00 48 8b 44 24 20 42 80 3c 20 00 74 08 4c 89 ff e8 f3 d3 d8 f7 bf 70 02 00 00 49 03 3f e8 96 27 95 00 <eb> 05 e8 af f2 7f f7 48 8b 5c 24 08 48 8d bb 80 22 00 00 e8 8e 54
RSP: 0018:ffffc9000c74f860 EFLAGS: 00010246
RAX: 0f36a3bc9539e400 RBX: ffff888026b41570 RCX: 0f36a3bc9539e400
RDX: dffffc0000000000 RSI: ffffffff8acacfe0 RDI: ffffffff8b1d5160
RBP: ffffc9000c74fa48 R08: ffffffff91ff156f R09: 1ffffffff23fe2ad
R10: dffffc0000000000 R11: fffffbfff23fe2ae R12: dffffc0000000000
R13: ffffc9000c74f9b0 R14: ffff888058fa8265 R15: ffff888058fa9610
 ieee80211_stop+0x423/0x490 net/mac80211/iface.c:815
 __dev_close_many+0x1d5/0x2b0 net/core/dev.c:1603
 __dev_close net/core/dev.c:1615 [inline]
 __dev_change_flags+0x2cd/0x6a0 net/core/dev.c:8746
 dev_change_flags+0x7c/0x1a0 net/core/dev.c:8820
 dev_ioctl+0x7b4/0x1140 net/core/dev_ioctl.c:770
 sock_do_ioctl+0x239/0x310 net/socket.c:1234
 sock_ioctl+0x5be/0x7e0 net/socket.c:1341
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
 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: 0033:0x7fc9eed9e559
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:00007fc9efbd1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fc9ef025fa0 RCX: 00007fc9eed9e559
RDX: 0000200000000080 RSI: 0000000000008914 RDI: 000000000000000b
RBP: 00007fc9eee35ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc9ef026038 R14: 00007fc9ef025fa0 R15: 00007ffe3b2d38e8
 </TASK>
CPU: 0 PID: 9910 Comm: syz.4.897 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:debug_lockdep_rcu_enabled+0xd/0x30 kernel/rcu/update.c:319
Code: ce ca 8a 48 c7 c6 a0 f2 ca 8a e8 de 3d be f6 0f 0b eb c1 cc cc cc cc cc cc cc cc cc cc f3 0f 1e fa 31 c0 83 3d 9f 4a d9 04 00 <74> 1d 83 3d 16 7e d9 04 00 74 14 65 48 8b 0d 60 a6 70 75 31 c0 83
RSP: 0018:ffffc90000006808 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000100
RDX: ffff888060158000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000006978 R08: ffffc90000006aa0 R09: ffffc90000006ab0
R10: ffffc90000006900 R11: fffff52000000d22 R12: 1ffff1100bdfd60c
R13: dffffc0000000000 R14: ffff88805e4b1000 R15: ffffc90000006a78
FS:  00007fb3d3ad16c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555557fb64e8 CR3: 000000001bb99000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_read_lock_held_common kernel/rcu/update.c:104 [inline]
 rcu_read_lock_held+0xa/0x40 kernel/rcu/update.c:348
 __find_rr_leaf+0x34e/0x730 net/ipv6/route.c:840
 find_rr_leaf net/ipv6/route.c:895 [inline]
 rt6_select net/ipv6/route.c:939 [inline]
 fib6_table_lookup+0x3c7/0xae0 net/ipv6/route.c:2236
 ip6_pol_route+0x231/0x1360 net/ipv6/route.c:2273
 pol_lookup_func include/net/ip6_fib.h:641 [inline]
 fib6_rule_lookup+0x226/0x580 net/ipv6/fib6_rules.c:116
 ip6_route_input_lookup net/ipv6/route.c:2344 [inline]
 ip6_route_input+0x78a/0xab0 net/ipv6/route.c:2640
 ip6_rcv_finish+0x143/0x230 net/ipv6/ip6_input.c:77
 ip_sabotage_in+0x1e2/0x270 net/bridge/br_netfilter_hooks.c:1005
 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+0x21d/0x3b0 include/linux/netfilter.h:302
 __netif_receive_skb_one_core net/core/dev.c:5671 [inline]
 __netif_receive_skb+0xcc/0x290 net/core/dev.c:5785
 netif_receive_skb_internal net/core/dev.c:5871 [inline]
 netif_receive_skb+0x1bc/0x720 net/core/dev.c:5930
 NF_HOOK+0x9e/0x3a0 include/linux/netfilter.h:304
 br_handle_frame_finish+0xf51/0x15c0 net/bridge/br_input.c:221
 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:__sanitizer_cov_trace_const_cmp8+0x0/0x80 kernel/kcov.c:317
Code: c0 4c 89 01 48 c7 44 11 08 05 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0d 00 23 7c 7e 65 8b 15 01 23 7c
RSP: 0018:ffffc9000c54f000 EFLAGS: 00000246
RAX: ffffffff8a931487 RBX: ffffc9000c54f0c0 RCX: 0000000000080000
RDX: ffffc900187bc000 RSI: ffffffff8a931487 RDI: 0000000000000000
RBP: ffffc9000c54f090 R08: ffff888060158000 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000002 R12: ffffffff8a931487
R13: 1ffff920018a9e84 R14: ffffffff81762b60 R15: ffffc9000c54f008
 arch_stack_walk+0x12a/0x190 arch/x86/kernel/stacktrace.c:27
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
 __call_rcu_common kernel/rcu/tree.c:2721 [inline]
 call_rcu+0x153/0x900 kernel/rcu/tree.c:2837
 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:__sanitizer_cov_trace_pc+0x45/0x60 kernel/kcov.c:217
Code: ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 24 16 00 00 00 74 2c 8b 91 00 16 00 00 83 fa 02 75 21 48 8b 91 08 16 00 00 48 8b 32 <48> 8d 7e 01 8b 89 04 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2
RSP: 0018:ffffc9000c54f860 EFLAGS: 00000246
RAX: ffffffff8881d739 RBX: ffffc9000c54f980 RCX: ffff888060158000
RDX: ffffc900187bc000 RSI: 000000000000030e RDI: ffff888060159790
RBP: 1ffff920018a9f30 R08: ffff88807b985f03 R09: 1ffff1100f730be0
R10: dffffc0000000000 R11: ffffed100f730be1 R12: dffffc0000000000
R13: 7fffffffffffffff R14: ffff888079800000 R15: 0000000000000000
 __skb_recv_datagram net/core/datagram.c:302 [inline]
 skb_recv_datagram+0x119/0x180 net/core/datagram.c:315
 packet_recvmsg+0x151/0x16f0 net/packet/af_packet.c:3533
 sock_recvmsg_nosec net/socket.c:1047 [inline]
 sock_recvmsg net/socket.c:1069 [inline]
 ____sys_recvmsg+0x2bd/0x5d0 net/socket.c:2814
 ___sys_recvmsg+0x214/0x590 net/socket.c:2856
 __sys_recvmsg net/socket.c:2886 [inline]
 __do_sys_recvmsg net/socket.c:2896 [inline]
 __se_sys_recvmsg net/socket.c:2893 [inline]
 __x64_sys_recvmsg+0x21e/0x2f0 net/socket.c:2893
 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: 0033:0x7fb3d2b9e559
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:00007fb3d3ad1028 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007fb3d2e25fa0 RCX: 00007fb3d2b9e559
RDX: 0000000000000020 RSI: 00002000000001c0 RDI: 0000000000000008
RBP: 00007fb3d2c35ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb3d2e26038 R14: 00007fb3d2e25fa0 R15: 00007fffef5b73b8
 </TASK>
net_ratelimit: 221 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:42:51:30:29:28:ab, 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:42:51:30:29:28:ab, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:42:51:30:29:28:ab, 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:42:51:30:29:28:ab, 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:42:51:30:29:28:ab, 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:42:51:30:29:28:ab, vlan:0)
net_ratelimit: 155 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:42:51:30:29:28:ab, 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:42:51:30:29:28:ab, 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:42:51:30:29:28:ab, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:42:51:30:29:28:ab, 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:42:51:30:29:28:ab, 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:42:51:30:29:28:ab, vlan:0)

Crashes (39):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/18 17:07 linux-6.6.y cecd39af8a1a 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/10/18 15:39 linux-6.6.y cecd39af8a1a 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/10/16 09:46 linux-6.6.y cecd39af8a1a 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/10/16 09:21 linux-6.6.y cecd39af8a1a 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/10/15 17:46 linux-6.6.y cecd39af8a1a 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/10/10 07:27 linux-6.6.y a91a6aa9253c 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/10/05 16:25 linux-6.6.y a91a6aa9253c af63e995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/10/05 16:01 linux-6.6.y a91a6aa9253c af63e995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/10/05 15:44 linux-6.6.y a91a6aa9253c af63e995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/10/04 18:24 linux-6.6.y a91a6aa9253c 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/10/02 13:53 linux-6.6.y 79643295eba1 6d32eb1f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/09/28 07:22 linux-6.6.y 79643295eba1 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/09/27 15:59 linux-6.6.y 79643295eba1 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/09/27 03:13 linux-6.6.y 79643295eba1 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/09/25 14:29 linux-6.6.y 79643295eba1 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/09/25 12:42 linux-6.6.y 79643295eba1 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/09/24 05:00 linux-6.6.y 79643295eba1 0281b448 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/08/15 12:38 linux-6.6.y d27334b2888c 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/07/08 21:03 linux-6.6.y da47cbc25466 88a4b44c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/07/01 01:49 linux-6.6.y d1cfde2d5d15 00e8b0fd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/06/07 13:37 linux-6.6.y 924b4a879cbb cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/05/10 23:30 linux-6.6.y 3b9f64db0496 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/05/10 03:38 linux-6.6.y 3b9f64db0496 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/04/27 12:20 linux-6.6.y 9760bf04666d 0f700595 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/04/22 03:48 linux-6.6.y 9760bf04666d 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/04/15 21:09 linux-6.6.y 8cee53b8eaeb c441f497 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/04/11 06:01 linux-6.6.y 80de0a958133 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/04/09 13:53 linux-6.6.y 80de0a958133 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/04/08 05:35 linux-6.6.y 80de0a958133 2c961e87 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/04/05 16:45 linux-6.6.y 08667c1437c0 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/04/05 11:28 linux-6.6.y 08667c1437c0 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/01/27 18:09 linux-6.6.y cbb31f77b879 9a514c2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/01/18 22:46 linux-6.6.y cbb31f77b879 20d37d28 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2026/01/04 19:22 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2025/12/29 21:27 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2025/12/04 10:48 linux-6.6.y 4791134e4aeb d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2025/12/01 00:32 linux-6.6.y 1e89a1be4fe9 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2025/11/26 09:45 linux-6.6.y 1e89a1be4fe9 64219f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
2025/11/21 04:48 linux-6.6.y 0a805b6ea8cd 2cc4c24a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in br_handle_frame
* Struck through repros no longer work on HEAD.