rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 4478 jiffies s: 1125 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4458 Comm: syz.3.10 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_preemption_disabled+0x1f/0x110 lib/smp_processor_id.c:16
Code: df 8a 48 c7 c6 00 0d df 8a eb 00 55 41 57 41 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65 8b 05 51 6f d5 75 <65> 8b 0d f2 c4 d5 75 f7 c1 ff ff ff 7f 74 1f 65 48 8b 0c 25 28 00
RSP: 0018:ffffc900001dfda8 EFLAGS: 00000082
RAX: 0000000000000001 RBX: ffffffff8c9f9498 RCX: 000000008a8e0704
RDX: 0000000000000000 RSI: ffffffff8adf0d00 RDI: ffffffff8adf0cc0
RBP: ffffc900001dfee0 R08: 0000000000000002 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff1c3f986 R12: dffffc0000000000
R13: 0000607f46e7ef58 R14: 1ffff9200003bfc4 R15: ffffffff8c9f9420
FS:  00007fabc20a16c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001580 CR3: 000000002fb4f000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 perf_trace_lock_acquire+0x100/0x3e0 include/trace/events/lock.h:24
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x452/0x4a0 kernel/locking/lockdep.c:5633
 seqcount_lockdep_reader_access+0xcd/0x1d0 include/linux/seqlock.h:102
 ktime_get+0x31/0x270 kernel/time/timekeeping.c:846
 clockevents_program_event+0xe2/0x310 kernel/time/clockevents.c:326
 hrtimer_interrupt+0x59d/0x9c0 kernel/time/hrtimer.c:1886
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1118
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:ipv6_skip_exthdr+0x5c8/0x630 net/ipv6/exthdrs_core.c:75
Code: 74 24 50 75 6c 0f b6 44 24 07 41 88 06 eb 93 e8 ae 5f 78 f8 eb 81 e8 a7 5f 78 f8 e9 6c ff ff ff e8 9d 5f 78 f8 e9 56 ff ff ff <44> 89 f1 80 e1 07 38 c1 0f 8c ba fa ff ff 4c 89 f7 e8 22 4b c9 f8
RSP: 0018:ffffc900001e0380 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000028 RCX: ffff88802f870000
RDX: 0000000000000100 RSI: 0000000000000028 RDI: ffff88802e55d000
RBP: ffffc900001e0470 R08: 0000000000000000 R09: 0000000000000001
R10: dffffc0000000000 R11: fffff5200003c09e R12: dffffc0000000000
R13: ffffc900001e04e0 R14: ffffc900001e04f0 R15: 1ffff9200003c07c
 ipv6_get_l4proto net/netfilter/nf_conntrack_core.c:397 [inline]
 get_l4proto+0x255/0x680 net/netfilter/nf_conntrack_core.c:420
 nf_conntrack_in+0x290/0x17b0 net/netfilter/nf_conntrack_core.c:2011
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:614
 nf_hook include/linux/netfilter.h:257 [inline]
 NF_HOOK include/linux/netfilter.h:300 [inline]
 ndisc_send_skb+0x1390/0x14e0 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x2d1/0x630 net/ipv6/addrconf.c:3979
 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x53e/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 92 31 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900048e70a0 EFLAGS: 00000206
RAX: b6fc48fdc2661500 RBX: 1ffff9200091ce1c RCX: b6fc48fdc2661500
RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0d20
RBP: ffffc900048e71a0 R08: ffffffff90af524f R09: 1ffffffff215ea49
R10: dffffc0000000000 R11: fffffbfff215ea4a R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 trace_call_bpf+0x5bb/0x6b0 kernel/trace/bpf_trace.c:137
 perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:9997
 perf_trace_lock_acquire+0x33f/0x3e0 include/trace/events/lock.h:24
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x452/0x4a0 kernel/locking/lockdep.c:5633
 __raw_spin_trylock include/linux/spinlock_api_smp.h:90 [inline]
 _raw_spin_trylock+0x43/0x70 kernel/locking/spinlock.c:138
 spin_trylock include/linux/spinlock.h:361 [inline]
 free_unref_page+0x16d/0x3f0 mm/page_alloc.c:3529
 free_slab mm/slub.c:2036 [inline]
 discard_slab mm/slub.c:2042 [inline]
 __unfreeze_partials+0x1a5/0x200 mm/slub.c:2591
 put_cpu_partial+0x17c/0x250 mm/slub.c:2667
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737
 slab_alloc_node mm/slub.c:3359 [inline]
 __kmem_cache_alloc_node+0x140/0x260 mm/slub.c:3398
 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026
 kmalloc include/linux/slab.h:563 [inline]
 __netdev_adjacent_dev_insert+0x158/0x8c0 net/core/dev.c:7577
 __netdev_adjacent_dev_link_lists net/core/dev.c:7669 [inline]
 __netdev_adjacent_dev_link_neighbour net/core/dev.c:7698 [inline]
 __netdev_upper_dev_link+0x39c/0x590 net/core/dev.c:7758
 netdev_master_upper_dev_link+0xb9/0x100 net/core/dev.c:7833
 br_add_if+0x46d/0xec0 net/bridge/br_if.c:633
 add_del_if net/bridge/br_ioctl.c:99 [inline]
 br_ioctl_stub+0x6c4/0xcf0 net/bridge/br_ioctl.c:462
 br_ioctl_call net/socket.c:1175 [inline]
 sock_ioctl+0x494/0x710 net/socket.c:1274
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fabc119bf79
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:00007fabc20a1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fabc1415fa0 RCX: 00007fabc119bf79
RDX: 0000200000000080 RSI: 00000000000089a2 RDI: 000000000000000c
RBP: 00007fabc12327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fabc1416038 R14: 00007fabc1415fa0 R15: 00007ffe2b670948
 </TASK>