rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-....: (1 GPs behind) idle=d3f/1/0x4000000000000002 softirq=66950/66951 fqs=5246 
	(detected by 1, t=10502 jiffies, g=96769, q=1338)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 22235 Comm: syz.9.4779 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__lock_release kernel/locking/lockdep.c:5309 [inline]
RIP: 0010:lock_release+0x228/0x8a0 kernel/locking/lockdep.c:5643
Code: 44 89 7c 24 3c 44 89 fa 85 c0 0f 84 d2 01 00 00 4d 85 e4 0f 84 0d 03 00 00 4d 8d 74 24 24 4c 89 f0 48 c1 e8 03 42 0f b6 04 28 <84> c0 0f 85 a7 04 00 00 41 83 3e 00 0f 85 dd 03 00 00 4d 8d 74 24
RSP: 0018:ffffc90000007000 EFLAGS: 00000803
RAX: 0000000000000000 RBX: 0000000000000014 RCX: 0000000000000001
RDX: 0000000000000004 RSI: ffffffff8c31eaa0 RDI: ffff8880746fe4d0
RBP: ffffc90000007110 R08: ffffffff8d89d8af R09: 1ffffffff1b13b15
R10: dffffc0000000000 R11: fffffbfff1b13b16 R12: ffff8880746fe4d0
R13: dffffc0000000000 R14: ffff8880746fe4f4 R15: 0000000000000004
FS:  00007fc022ec76c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc8e9e20e8 CR3: 000000002d238000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_read_unlock include/linux/rcupdate.h:773 [inline]
 __perf_event_output kernel/events/core.c:7813 [inline]
 perf_event_output_forward+0x261/0x2e0 kernel/events/core.c:7822
 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
 perf_swevent_overflow kernel/events/core.c:9591 [inline]
 perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9629
 perf_tp_event+0x383/0xbf0 kernel/events/core.c:10047
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
 perf_trace_preemptirq_template+0x2aa/0x360 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
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 c2 ef 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900000077c0 EFLAGS: 00000206
RAX: aa777029a5edc500 RBX: 1ffff92000000efc RCX: aa777029a5edc500
RDX: dffffc0000000000 RSI: ffffffff8a2b2780 RDI: ffffffff8a79f780
RBP: ffffc900000078a0 R08: ffffffff901d11c7 R09: 1ffffffff203a238
R10: dffffc0000000000 R11: fffffbfff203a239 R12: ffffffff8c322f00
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 ndisc_send_skb+0xde0/0x1500 net/ipv6/ndisc.c:521
 addrconf_rs_timer+0x2d1/0x630 net/ipv6/addrconf.c:3956
 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1451
 expire_timers kernel/time/timer.c:1496 [inline]
 __run_timers+0x53a/0x7f0 kernel/time/timer.c:1767
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
 handle_softirqs+0x339/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xbc/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 <e8> 8f 0b 8d f7 65 8b 05 10 18 3d 76 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc90002d9f3e0 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000282 RCX: aa777029a5edc500
RDX: dffffc0000000000 RSI: ffffffff8a2b2780 RDI: 0000000000000001
RBP: ffffc90002d9f470 R08: ffffffff901d11e7 R09: 1ffffffff203a23c
R10: dffffc0000000000 R11: fffffbfff203a23d R12: dffffc0000000000
R13: ffff8880b9027ea0 R14: ffff8880b9027ea0 R15: 1ffff920005b3e7c
 krc_this_cpu_unlock kernel/rcu/tree.c:3211 [inline]
 kvfree_call_rcu+0x4d0/0x7d0 kernel/rcu/tree.c:3633
 sctp_bind_addr_clean net/sctp/bind_addr.c:131 [inline]
 sctp_bind_addr_free+0x130/0x170 net/sctp/bind_addr.c:140
 sctp_association_free+0x2b2/0x7e0 net/sctp/associola.c:359
 sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:944 [inline]
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1331 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline]
 sctp_do_sm+0x3725/0x55f0 net/sctp/sm_sideeffect.c:1170
 sctp_primitive_SHUTDOWN+0x94/0xc0 net/sctp/primitive.c:89
 sctp_close+0x404/0x910 net/sctp/socket.c:1526
 inet_release+0x139/0x180 net/ipv4/af_inet.c:432
 __sock_release net/socket.c:651 [inline]
 sock_close+0xd5/0x240 net/socket.c:1345
 __fput+0x234/0x930 fs/file_table.c:311
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 get_signal+0x1222/0x12c0 kernel/signal.c:2672
 arch_do_signal_or_restart+0xe7/0x12c0 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fc024c6bcb9
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:00007fc022ec7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: fffffffffffffe00 RBX: 00007fc024ee6fa0 RCX: 00007fc024c6bcb9
RDX: 000000000000006e RSI: 0000000000000084 RDI: 0000000000000005
RBP: 00007fc024cd9bf7 R08: 0000000000000020 R09: 0000000000000000
R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc024ee7038 R14: 00007fc024ee6fa0 R15: 00007ffc06844da8
 </TASK>