rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2685 jiffies s: 1245 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4530 Comm: syz.3.51 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x60 kernel/kcov.c:211
Code: 00 00 00 00 00 90 53 48 89 fb e8 17 00 00 00 48 8b 3d 10 e2 9e 0c 48 89 de 5b e9 57 6f 50 00 00 00 cc cc 00 00 cc 48 8b 04 24 <65> 48 8b 0d a4 3d 80 7e 65 8b 15 a5 3d 80 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc90000007438 EFLAGS: 00000002
RAX: ffffffff818be0d3 RBX: 0000000000000001 RCX: 8567e226a7250300
RDX: ffff88802c46da00 RSI: ffffffff8adf6200 RDI: ffffffff8adf61c0
RBP: ffffc90000007538 R08: ffffffff8fa28008 R09: ffffffff8fa28018
R10: ffffffff8fa28010 R11: ffffffff8fa28003 R12: 0000000000120000
R13: 1ffff92000000e94 R14: ffff888076a228a8 R15: 0000000000000000
FS:  00007fcf9e8cb6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003000 CR3: 0000000055e97000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_read_unlock include/linux/rcupdate.h:820 [inline]
 trace_call_bpf+0x4e3/0x6b0 kernel/trace/bpf_trace.c:137
 perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:10037
 perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
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 12 7c 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:ffffc90000007760 EFLAGS: 00000206
RAX: 8567e226a7250300 RBX: 1ffff92000000ef4 RCX: 8567e226a7250300
RDX: dffffc0000000000 RSI: ffffffff8a8c1820 RDI: ffffffff8adf6220
RBP: ffffc90000007860 R08: ffffffff90b13337 R09: 1ffffffff2162666
R10: dffffc0000000000 R11: fffffbfff2162667 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8e3bb00 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 ndisc_send_skb+0xdc2/0x1520 net/ipv6/ndisc.c:521
 addrconf_rs_timer+0x367/0x640 net/ipv6/addrconf.c:3986
 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x56c/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x291/0x910 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:lock_acquire+0x225/0x4a0 kernel/locking/lockdep.c:5680
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3d 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 44 3d 00 00 00 00 00 43 c7 44 3d 08 00 00 00 00 65 48 8b 04
RSP: 0018:ffffc90004befae0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 8567e226a7250300
RDX: 0000000000000000 RSI: ffffffff8a8c29a0 RDI: ffffffff8adf6220
RBP: ffffc90004befbf0 R08: dffffc0000000000 R09: 1ffffffff216264a
R10: dffffc0000000000 R11: fffffbfff216264b R12: 0000000000000000
R13: 1ffff9200097df68 R14: 0000000000000246 R15: dffffc0000000000
 fs_reclaim_acquire+0x94/0x100 mm/page_alloc.c:4766
 might_alloc include/linux/sched/mm.h:271 [inline]
 slab_pre_alloc_hook+0x2a/0x300 mm/slab.h:710
 slab_alloc_node mm/slub.c:3279 [inline]
 __kmem_cache_alloc_node+0x4f/0x270 mm/slub.c:3398
 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 sctp_auth_shkey_create+0x77/0x190 net/sctp/auth.c:84
 sctp_endpoint_init net/sctp/endpointola.c:98 [inline]
 sctp_endpoint_new+0x43c/0xa00 net/sctp/endpointola.c:138
 sctp_init_sock+0x95b/0x11c0 net/sctp/socket.c:5078
 inet_create+0xc25/0xf60 net/ipv4/af_inet.c:379
 __sock_create+0x49a/0x940 net/socket.c:1550
 sock_create net/socket.c:1606 [inline]
 __sys_socket_create net/socket.c:1643 [inline]
 __sys_socket+0xc4/0x190 net/socket.c:1671
 __do_sys_socket net/socket.c:1684 [inline]
 __se_sys_socket net/socket.c:1682 [inline]
 __x64_sys_socket+0x76/0x80 net/socket.c:1682
 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: 0033:0x7fcf9d99e159
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:00007fcf9e8cb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007fcf9dc25fa0 RCX: 00007fcf9d99e159
RDX: 0000000000000084 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 00007fcf9da35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcf9dc26038 R14: 00007fcf9dc25fa0 R15: 00007fff4a72f3d8
 </TASK>