rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=e42c/1/0x4000000000000000 softirq=19918/19922 fqs=5216
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1406486          0            0
rcu: 	cputime:    16287      36201           67   ==> 52500(ms)
rcu: 	(t=10501 jiffies g=21373 q=1295 ncpus=2)
CPU: 1 PID: 7508 Comm: syz.0.394 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__read_once_word_nocheck+0x0/0x10 include/asm-generic/rwonce.h:66
Code: df e8 44 25 a2 00 e9 a0 fd ff ff 44 89 e1 80 e1 07 38 c1 0f 8c 5d fc ff ff 4c 89 e7 e8 89 25 a2 00 e9 50 fc ff ff 0f 1f 40 00 <53> 48 89 fb e8 47 b7 4a 00 48 8b 03 5b c3 cc cc f3 0f 1e fa 55 48
RSP: 0018:ffffc900001f0410 EFLAGS: 00000246
RAX: ffffffff813ad017 RBX: 1ffff9200003e0a9 RCX: ffff88805af91e00
RDX: 0000000000000100 RSI: 0000000000000002 RDI: ffffc900001f08c0
RBP: ffffc900001f08c0 R08: ffff88805af91e00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc900001f1000
R13: 1ffff9200003e0ab R14: ffffc900001e9000 R15: dffffc0000000000
FS:  00007f47ca9836c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000140 CR3: 0000000076d51000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 deref_stack_reg+0x1bd/0x240 arch/x86/kernel/unwind_orc.c:406
 unwind_next_frame+0x1789/0x2970 arch/x86/kernel/unwind_orc.c:648
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
 slab_alloc_node mm/slub.c:3495 [inline]
 kmem_cache_alloc_node+0x150/0x330 mm/slub.c:3540
 kmalloc_reserve+0x95/0x240 net/core/skbuff.c:562
 __alloc_skb+0x138/0x2c0 net/core/skbuff.c:653
 alloc_skb include/linux/skbuff.h:1284 [inline]
 ndisc_alloc_skb+0xa6/0x450 net/ipv6/ndisc.c:423
 ndisc_send_rs+0x2a6/0x610 net/ipv6/ndisc.c:707
 addrconf_rs_timer+0x2bc/0x600 net/ipv6/addrconf.c:4006
 call_timer_fn+0x16e/0x530 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x52d/0x7d0 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 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:generic_exec_single+0x476/0x4f0 kernel/smp.c:418
Code: 75 11 e8 cd e6 0a 00 48 85 db 75 16 e8 c3 e6 0a 00 eb 15 e8 bc e6 0a 00 e8 47 cd ec 08 48 85 db 74 ea e8 ad e6 0a 00 fb 31 c0 <48> c7 44 24 20 0e 36 e0 45 4b c7 04 2c 00 00 00 00 66 43 c7 44 2c
RSP: 0018:ffffc900038c7a00 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000080000
RDX: ffffc9000be09000 RSI: 0000000000003096 RDI: 0000000000003097
RBP: ffffc900038c7ad0 R08: ffffffff90d945ff R09: 1ffffffff21b28bf
R10: dffffc0000000000 R11: fffffbfff21b28c0 R12: 1ffff92000718f44
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff92000718f65
 smp_call_function_single+0x352/0x580 kernel/smp.c:647
 task_function_call kernel/events/core.c:120 [inline]
 perf_install_in_context+0x591/0x8e0 kernel/events/core.c:2948
 __do_sys_perf_event_open kernel/events/core.c:12915 [inline]
 __se_sys_perf_event_open+0x17fa/0x1c20 kernel/events/core.c:12567
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f47c9b8f749
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:00007f47ca983038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f47c9de5fa0 RCX: 00007f47c9b8f749
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000140
RBP: 00007f47c9c13f91 R08: 0000000000000002 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f47c9de6038 R14: 00007f47c9de5fa0 R15: 00007ffc5aa931d8
 </TASK>