syzbot

rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2681 jiffies s: 86253 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: 18297 Comm: syz.8.3368 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:kvm_guest_state+0x0/0xf0 virt/kvm/kvm_main.c:5857
Code: 9a 4c 89 e7 e8 a1 ed c6 00 eb 90 44 89 f1 80 e1 07 80 c1 03 38 c1 7c af 4c 89 f7 e8 8a ed c6 00 eb a5 0f 1f 84 00 00 00 00 00 <55> 41 57 41 56 53 e8 65 c0 76 00 bf 01 00 00 00 e8 1b a6 4d 00 48
RSP: 0018:ffffc900000070d0 EFLAGS: 00000046
RAX: ffffffff810112b8 RBX: ffff8880b8e35518 RCX: ffff88805c07d940
RDX: 0000000000000100 RSI: ffffc90000007400 RDI: ffff8880b8e35518
RBP: ffffc900000071f0 R08: dffffc0000000000 R09: ffffc90000007240
R10: fffff52000000e4f R11: 1ffff92000000e48 R12: dffffc0000000000
R13: ffff88805cb0d400 R14: 1ffff92000000e54 R15: dffffc0000000000
FS:  00007fe8155f66c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe8155f5f98 CR3: 000000003a8cf000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 perf_guest_state include/linux/perf_event.h:1332 [inline]
 perf_misc_flags+0x1d/0xc0 arch/x86/events/core.c:3041
 perf_prepare_sample+0x12f/0x2040 kernel/events/core.c:7529
 __perf_event_output kernel/events/core.c:7730 [inline]
 perf_event_output_forward+0x163/0x2a0 kernel/events/core.c:7750
 __perf_event_overflow+0x448/0x610 kernel/events/core.c:9496
 perf_tp_event+0x335/0xb60 kernel/events/core.c:10029
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10002
 perf_trace_preemptirq_template+0x287/0x330 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+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 2d 97 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:ffffc90000007820 EFLAGS: 00000206
RAX: 13fd09c93a7a5600 RBX: 1ffff92000000f0c RCX: 13fd09c93a7a5600
RDX: dffffc0000000000 RSI: ffffffff8a8c0500 RDI: ffffffff8adefd20
RBP: ffffc90000007920 R08: dffffc0000000000 R09: fffffbfff215c466
R10: fffffbfff215c466 R11: 1ffffffff215c465 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]
 ipv6_get_ifaddr+0x582/0x5f0 net/ipv6/addrconf.c:2061
 ndisc_send_rs+0x94/0x610 net/ipv6/ndisc.c:692
 addrconf_rs_timer+0x2b8/0x600 net/ipv6/addrconf.c:3979
 call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
 expire_timers kernel/time/timer.c:1549 [inline]
 __run_timers+0x525/0x7c0 kernel/time/timer.c:1820
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
 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:apparmor_socket_sendmsg+0x0/0x30 security/apparmor/lsm.c:986
Code: 96 0f b6 fd 48 c7 c7 20 f7 d8 8a 48 c7 c6 c2 8c 4b 8c e8 93 3b 82 fd 0f 0b 43 80 3c 3c 00 0f 85 56 ff ff ff e9 59 ff ff ff 90 <41> 56 53 48 89 f3 49 89 fe e8 62 0f b6 fd 48 c7 c7 a0 ec d8 8a be
RSP: 0018:ffffc90004fefa00 EFLAGS: 00000246
RAX: 1ffffffff18bcd6a RBX: 00000000000000d8 RCX: 0000000000080000
RDX: 00000000000000d8 RSI: ffffc90004fefe20 RDI: ffff888072562a00
RBP: dffffc0000000000 R08: ffff88805c07d940 R09: 0000000000000003
R10: 000000000000000a R11: 0000000000000002 R12: ffffffff8c5e6b38
R13: ffffffff8c5e6b50 R14: ffffc90004fefe20 R15: ffff888072562a00
 security_socket_sendmsg+0x6c/0xa0 security/security.c:2275
 __sock_sendmsg net/socket.c:727 [inline]
 ____sys_sendmsg+0x508/0x970 net/socket.c:2519
 ___sys_sendmsg+0x21c/0x290 net/socket.c:2573
 __sys_sendmsg net/socket.c:2602 [inline]
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg+0x19e/0x270 net/socket.c:2609
 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: 0033:0x7fe81738eec9
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:00007fe8155f6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fe8175e6180 RCX: 00007fe81738eec9
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 000000000000000d
RBP: 00007fe817411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe8175e6218 R14: 00007fe8175e6180 R15: 00007ffcd473d628
 </TASK>