syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-....: (4 ticks this GP) idle=449c/0/0x3 softirq=10649/10651 fqs=5247
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number: 20818045          0            0
rcu: 	cputime:     7821      44703            0   ==> 52510(ms)
rcu: 	(detected by 0, t=10502 jiffies, g=8869, q=770 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:get_current arch/x86/include/asm/current.h:41 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x60 kernel/kcov.c:215
Code: 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d 8c f1 c4 0c 48 89 de 5b e9 63 75 56 00 cc cc cc f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0d 60 24 7e 7e 65 8b 15 61 24 7e 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc900001f02c8 EFLAGS: 00000046
RAX: ffffffff819277c8 RBX: ffff8880b8f3d370 RCX: ffff88801b273c00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 0000000000000001 R08: ffffc900001f0247 R09: 1ffff9200003e048
R10: dffffc0000000000 R11: fffff5200003e049 R12: dffffc0000000000
R13: dffffc0000000001 R14: ffffffff8c7d0a38 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f63e87d9042 CR3: 0000000031980000 CR4: 00000000003506e0
Call Trace:
 <IRQ>
 arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline]
 static_key_false include/linux/jump_label.h:207 [inline]
 trace_ipi_send_cpu_enabled include/trace/events/ipi.h:38 [inline]
 irq_work_raise kernel/irq_work.c:81 [inline]
 __irq_work_queue_local+0x118/0x3b0 kernel/irq_work.c:112
 irq_work_queue_on+0x122/0x220 kernel/irq_work.c:175
 rcu_read_unlock_special+0x3a7/0x4c0 kernel/rcu/tree_plugin.h:675
 __rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:818 [inline]
 trace_call_bpf+0x59f/0x690 kernel/trace/bpf_trace.c:145
 perf_trace_run_bpf_submit+0x7a/0x1c0 kernel/events/core.c:10248
 perf_trace_preemptirq_template+0x281/0x340 include/trace/events/preemptirq.h:14
 trace_irq_enable+0xbf/0xe0 include/trace/events/preemptirq.h:40
 trace_hardirqs_on_prepare+0x18/0x30 kernel/trace/trace_preemptirq.c:45
 irqentry_exit+0x4f/0x70 kernel/entry/common.c:428
 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723
RIP: 0010:rcu_read_unlock_special+0x88/0x4c0 kernel/rcu/tree_plugin.h:682
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 a9 4e 93 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:ffffc900001f07a0 EFLAGS: 00000206
RAX: 90696375901bbe00 RBX: 1ffff9200003e0fc RCX: 90696375901bbe00
RDX: dffffc0000000000 RSI: ffffffff8aaaba40 RDI: ffffffff8afc6780
RBP: ffffc900001f08a0 R08: ffffffff90da361f R09: 1ffffffff21b46c3
R10: dffffc0000000000 R11: fffffbfff21b46c4 R12: ffffffff8cd35400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
 __rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:818 [inline]
 ndisc_send_skb+0xd9a/0x14b0 net/ipv6/ndisc.c:521
 addrconf_rs_timer+0x2bc/0x600 net/ipv6/addrconf.c:4007
 call_timer_fn+0x16e/0x530 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1751 [inline]
 __run_timers+0x52d/0x7d0 kernel/time/timer.c:2022
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:148
Code: cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d 83 16 3b 00 f3 0f 1e fa fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc 66 0f 1f 00 55 41 57 41 56
RSP: 0018:ffffc90000187de0 EFLAGS: 000002c2
RAX: 90696375901bbe00 RBX: ffffffff81619a6b RCX: 90696375901bbe00
RDX: 0000000000000001 RSI: ffffffff8aaaba40 RDI: ffffffff8afc6780
RBP: ffffc90000187f20 R08: ffff8880b8f36d4b R09: 1ffff110171e6da9
R10: dffffc0000000000 R11: ffffed10171e6daa R12: ffffffff8e4a84e8
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff1100364e780
 arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:753
 default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97
 cpuidle_idle_call kernel/sched/idle.c:170 [inline]
 do_idle+0x1eb/0x510 kernel/sched/idle.c:282
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:380
 start_secondary+0xee/0xf0 arch/x86/kernel/smpboot.c:323
 secondary_startup_64_no_verify+0x179/0x17b
 </TASK>