rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10499 ticks this GP) idle=0a14/1/0x4000000000000000 softirq=211998/211998 fqs=4092 rcu: hardirqs softirqs csw/system rcu: number: 1589434 0 0 rcu: cputime: 17613 34875 53 ==> 52490(ms) rcu: (t=10500 jiffies g=257005 q=2779 ncpus=2) CPU: 0 PID: 14175 Comm: syz.1.12396 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xc0/0x120 kernel/locking/spinlock.c:194 Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 6b a2 bb f6 65 8b 05 7c 23 62 75 85 c0 74 3c 48 c7 04 24 0e 36 RSP: 0018:ffffc90000006e40 EFLAGS: 00000206 RAX: dffffc0000000004 RBX: 0000000000000a02 RCX: c2d5e03edaf65700 RDX: dffffc0000000000 RSI: ffffffff8aead140 RDI: 0000000000000001 RBP: ffffc90000006ec0 R08: ffffffff922235f7 R09: 1ffffffff24446be R10: dffffc0000000000 R11: fffffbfff24446bf R12: dffffc0000000000 R13: ffff8880511f74b0 R14: ffffffff985f4bf8 R15: 1ffff92000000dc8 FS: 00007f99aed8e6c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000000 CR3: 0000000064291000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:1054 [inline] debug_check_no_obj_freed+0x47b/0x520 lib/debugobjects.c:1075 slab_free_hook mm/slub.c:1796 [inline] slab_free_freelist_hook+0xdd/0x240 mm/slub.c:1859 slab_free mm/slub.c:3853 [inline] kmem_cache_free+0xf8/0x290 mm/slub.c:3875 kfree_skb include/linux/skbuff.h:1264 [inline] packet_rcv_fanout+0xdf/0x680 net/packet/af_packet.c:1533 dev_queue_xmit_nit+0xb0c/0xba0 net/core/dev.c:2390 xmit_one net/core/dev.c:3667 [inline] dev_hard_start_xmit+0x150/0x790 net/core/dev.c:3687 __dev_queue_xmit+0x1d1e/0x3a30 net/core/dev.c:4518 dev_queue_xmit include/linux/netdevice.h:3174 [inline] vlan_dev_hard_start_xmit+0x35a/0x5c0 net/8021q/vlan_dev.c:130 __netdev_start_xmit include/linux/netdevice.h:5003 [inline] netdev_start_xmit include/linux/netdevice.h:5017 [inline] xmit_one net/core/dev.c:3671 [inline] dev_hard_start_xmit+0x269/0x790 net/core/dev.c:3687 __dev_queue_xmit+0x1d1e/0x3a30 net/core/dev.c:4518 neigh_output include/net/neighbour.h:547 [inline] ip6_finish_output2+0xe61/0x1550 net/ipv6/ip6_output.c:138 NF_HOOK_COND include/linux/netfilter.h:305 [inline] ip6_output+0x33b/0x530 net/ipv6/ip6_output.c:242 dst_output include/net/dst.h:470 [inline] NF_HOOK include/linux/netfilter.h:316 [inline] ndisc_send_skb+0xbb9/0x1480 net/ipv6/ndisc.c:513 addrconf_rs_timer+0x36b/0x640 net/ipv6/addrconf.c:4043 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x570/0x810 kernel/time/timer.c:2023 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036 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 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:generic_exec_single+0x477/0x4e0 kernel/smp.c:418 Code: 75 11 e8 2c 15 0b 00 48 85 db 75 16 e8 22 15 0b 00 eb 15 e8 1b 15 0b 00 e8 f6 18 1b 09 48 85 db 74 ea e8 0c 15 0b 00 fb 31 c0 <48> c7 44 24 20 0e 36 e0 45 4b c7 04 2c 00 00 00 00 43 c7 44 2c 08 RSP: 0018:ffffc900034e7a00 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000080000 RDX: ffffc9000ceda000 RSI: 0000000000001afa RDI: 0000000000001afb RBP: ffffc900034e7ad0 R08: ffffffff92223607 R09: 1ffffffff24446c0 R10: dffffc0000000000 R11: fffffbfff24446c1 R12: 1ffff9200069cf44 R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff9200069cf65 smp_call_function_single+0x36d/0x5a0 kernel/smp.c:647 task_function_call kernel/events/core.c:120 [inline] perf_install_in_context+0x5bb/0x920 kernel/events/core.c:2959 __do_sys_perf_event_open kernel/events/core.c:12952 [inline] __se_sys_perf_event_open+0x180d/0x1d40 kernel/events/core.c:12594 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: 0033:0x7f99adfa94d9 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:00007f99aed8e028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f99ae225fa0 RCX: 00007f99adfa94d9 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000580 RBP: 00007f99ae03804e R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f99ae226038 R14: 00007f99ae225fa0 R15: 00007ffc19622738