rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2664 jiffies s: 334037 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: 26109 Comm: syz.1.4869 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:perf_trace_preemptirq_template+0xd/0x320 include/trace/events/preemptirq.h:14
Code: 8c 56 ff ff ff 48 89 c7 49 89 c6 e8 0d e1 4a 00 4c 89 f0 e9 43 ff ff ff 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 <48> 83 e4 e0 48 81 ec a0 00 00 00 48 89 54 24 18 48 89 74 24 10 49
RSP: 0018:ffffc900001e05a0 EFLAGS: 00000046
RAX: 1ffff1100b129a73 RBX: 0000000000000000 RCX: ffff88807cddda00
RDX: 0000000000000000 RSI: ffffffff8a400e86 RDI: ffffffff8cb80060
RBP: ffffc900001e05c8 R08: ffff8880b8f357cb R09: 1ffff110171e6af9
R10: dffffc0000000000 R11: ffffed10171e6afa R12: dffffc0000000000
R13: 0000000000000001 R14: ffffffff8a400e86 R15: ffff88805894d398
FS:  00007fea38cae6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fea38c2ad58 CR3: 0000000061049000 CR4: 00000000003506e0
DR0: fffffffffffffffc DR1: 0000000000000000 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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 32 7b 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:ffffc900001e06c0 EFLAGS: 00000206
RAX: 0a783e584d03e000 RBX: 1ffff9200003c0e0 RCX: 0a783e584d03e000
RDX: dffffc0000000000 RSI: ffffffff8a8c18a0 RDI: ffffffff8adf68a0
RBP: ffffc900001e07c0 R08: ffffffff90b0f30f R09: 1ffffffff2161e61
R10: dffffc0000000000 R11: fffffbfff2161e62 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3bb00 R15: 0000000000000002
 __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
 ndisc_send_ns net/ipv6/ndisc.c:671 [inline]
 ndisc_solicit+0x36b/0x660 net/ipv6/ndisc.c:763
 neigh_probe net/core/neighbour.c:1080 [inline]
 neigh_timer_handler+0xaba/0x1090 net/core/neighbour.c:1162
 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+0x0/0x4a0 kernel/locking/lockdep.c:5646
Code: c1 0f 8c 3a fb ff ff 48 c7 c7 28 e9 20 8e e8 a7 7d 6f 00 e9 29 fb ff ff 66 90 65 8b 05 51 75 9e 7e a9 00 ff ff 00 0f 95 c0 c3 <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec e0 00
RSP: 0018:ffffc9000c20fc20 EFLAGS: 00000246
RAX: 0a783e584d03e000 RBX: ffffffff81c7eea8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8cc18f40
RBP: 0000000000000dc0 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff2161e4b R12: 0000000000000000
R13: 00000000000001c8 R14: ffff888140009a00 R15: 0000000000000001
 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]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x56/0x2f0 mm/slub.c:3383
 kmem_cache_zalloc include/linux/slab.h:689 [inline]
 __alloc_file+0x25/0x230 fs/file_table.c:138
 alloc_empty_file+0x90/0x180 fs/file_table.c:187
 alloc_file+0x5b/0x5f0 fs/file_table.c:229
 alloc_file_pseudo+0x180/0x200 fs/file_table.c:272
 sock_alloc_file+0xb3/0x240 net/socket.c:467
 sock_map_fd net/socket.c:491 [inline]
 __sys_socket+0x12d/0x190 net/socket.c:1679
 __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: 0033:0x7fea37d9e159
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:00007fea38cae028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007fea38025fa0 RCX: 00007fea37d9e159
RDX: 0000000000000010 RSI: 0000000000000003 RDI: 0000000000000010
RBP: 00007fea37e3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fea38026038 R14: 00007fea38025fa0 R15: 00007fff733f7c28
 </TASK>