rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2680 jiffies s: 477749 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: 750 Comm: syz.9.7576 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:ct_dynticks_nmi_nesting include/linux/context_tracking_state.h:92 [inline]
RIP: 0010:ct_nmi_exit+0x7d/0x1c0 kernel/context_tracking.c:-1
Code: 04 f5 80 49 5e 8c f7 80 c8 57 03 00 04 00 00 00 0f 84 f7 00 00 00 48 c7 c7 c0 d2 94 8a e8 4b 0b 00 00 65 4c 8b 35 5b 7b eb 75 <48> c7 c7 c0 d2 94 8a e8 37 0b 00 00 65 48 8b 05 47 7b eb 75 49 83
RSP: 0018:ffffc900000075a8 EFLAGS: 00000082
RAX: 0000000000000000 RBX: ffff8880b8e357c0 RCX: 863075c2b3270200
RDX: 0000000000000100 RSI: ffffffff8a94d2c0 RDI: ffffffff8adef760
RBP: ffffc90000007668 R08: dffffc0000000000 R09: fffffbfff1c3ed56
R10: fffffbfff1c3ed56 R11: 1ffffffff1c3ed55 R12: dffffc0000000000
R13: 0000000000000000 R14: 4000000000000002 R15: 0000000000000000
FS:  00007f4fbe8a86c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa1aed4af98 CR3: 0000000052d56000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 ct_irq_exit_irqson+0xa8/0x160 kernel/context_tracking.c:422
 trace_irq_enable_rcuidle+0xd8/0x140 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+0x84/0x500 kernel/rcu/tree_plugin.h:685
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 ed 90 96 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc90000007760 EFLAGS: 00000206
RAX: 863075c2b3270200 RBX: 1ffff92000000ef4 RCX: 863075c2b3270200
RDX: dffffc0000000000 RSI: ffffffff8a8c0580 RDI: ffffffff8adef760
RBP: ffffc90000007860 R08: dffffc0000000000 R09: fffffbfff215c467
R10: fffffbfff215c467 R11: 1ffffffff215c466 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8e3b900 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+0xda7/0x1510 net/ipv6/ndisc.c:521
 addrconf_rs_timer+0x2b8/0x600 net/ipv6/addrconf.c:3979
 call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1751 [inline]
 __run_timers+0x529/0x7d0 kernel/time/timer.c:2022
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2035
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x12f/0x220 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:__list_del_entry_valid+0xa5/0x120 lib/list_debug.c:62
Code: e8 c0 90 c5 fd 49 8b 17 48 39 da 75 70 4d 8d 7e 08 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8 9e 90 c5 fd 49 8b 17 <48> 39 da 75 62 b0 01 5b 41 5c 41 5e 41 5f c3 48 c7 c7 80 fa de 8a
RSP: 0018:ffffc9000d5ef6d0 EFLAGS: 00000246
RAX: 1ffff1100f288b53 RBX: ffff8880794455c0 RCX: dffffc0000000000
RDX: ffff8880794455c0 RSI: 000000000007ffff RDI: ffff8880794455c8
RBP: ffff888052580000 R08: dffffc0000000000 R09: ffffed10068bdb79
R10: ffffed10068bdb79 R11: 1ffff110068bdb78 R12: dffffc0000000000
R13: ffff8880794455b0 R14: ffff888079445a90 R15: ffff888079445a98
 __list_del_entry include/linux/list.h:134 [inline]
 list_del include/linux/list.h:148 [inline]
 unlink_anon_vmas+0x14f/0x660 mm/rmap.c:419
 free_pgtables+0x24e/0x3d0 mm/memory.c:430
 exit_mmap+0x33b/0x8e0 mm/mmap.c:3260
 __mmput+0x118/0x3c0 kernel/fork.c:1200
 copy_process+0x2c0b/0x4020 kernel/fork.c:2609
 kernel_clone+0x225/0x8b0 kernel/fork.c:2757
 __do_sys_clone kernel/fork.c:2898 [inline]
 __se_sys_clone kernel/fork.c:2882 [inline]
 __x64_sys_clone+0x17c/0x1d0 kernel/fork.c:2882
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4fbd98f6c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4fbe8a7fe8 EFLAGS: 00000202 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f4fbdbe5fa0 RCX: 00007f4fbd98f6c9
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000024021004
RBP: 00007f4fbda11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007f4fbdbe6038 R14: 00007f4fbdbe5fa0 R15: 00007ffcd3eb63e8
 </TASK>