rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10500 ticks this GP) idle=4e74/1/0x4000000000000000 softirq=12840/12840 fqs=1874
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   400188          0            0
rcu: 	cputime:     4941      10031           18   ==> 15000(ms)
rcu: 	(t=10503 jiffies g=11909 q=796 ncpus=2)
CPU: 1 PID: 5936 Comm: syz.3.20 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:preempt_count_add+0x140/0x1a0 kernel/sched/core.c:5849
Code: 48 c7 c1 80 b4 2c 97 80 e1 07 80 c1 03 38 c1 0f 8c 00 ff ff ff 89 fb 48 c7 c7 80 b4 2c 97 e8 a7 d0 82 00 89 df e9 eb fe ff ff <48> c7 c1 80 b4 2c 97 80 e1 07 80 c1 03 38 c1 0f 8c 05 ff ff ff 89
RSP: 0018:ffffc900001f03f0 EFLAGS: 00000202
RAX: 0000000000000004 RBX: 1ffff9200003e0a9 RCX: ffffffff972cb403
RDX: ffff88802e340000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: 0000000000000002 R08: ffffc900001f0500 R09: 0000000000000000
R10: ffffc900001f0548 R11: fffff5200003e0b5 R12: ffffc900001f0548
R13: dffffc0000000000 R14: ffffc900001f0580 R15: dffffc0000000000
FS:  00007f5d52c2a6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 0000000076e78000 CR4: 00000000003506e0
Call Trace:
 <IRQ>
 unwind_next_frame+0xbe/0x2970 arch/x86/kernel/unwind_orc.c:479
 __unwind_start+0x66a/0x7e0 arch/x86/kernel/unwind_orc.c:760
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xf8/0x190 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 __kfence_alloc+0x2d7/0x3d0 mm/kfence/core.c:1133
 kfence_alloc include/linux/kfence.h:129 [inline]
 slab_alloc_node mm/slub.c:3481 [inline]
 kmem_cache_alloc_node+0x2b4/0x320 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:1316 [inline]
 ndisc_alloc_skb+0xa6/0x450 net/ipv6/ndisc.c:423
 ndisc_send_rs+0x2a6/0x610 net/ipv6/ndisc.c:707
 addrconf_rs_timer+0x2d5/0x630 net/ipv6/addrconf.c:4024
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x542/0x800 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+0xd3/0x190 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+0x481/0x4f0 kernel/smp.c:418
Code: 75 11 e8 42 05 0b 00 48 85 db 75 16 e8 38 05 0b 00 eb 15 e8 31 05 0b 00 e8 bc 08 0a 09 48 85 db 74 ea e8 22 05 0b 00 fb 31 c0 <48> c7 44 24 20 0e 36 e0 45 4b c7 04 2c 00 00 00 00 43 c7 44 2c 08
RSP: 0018:ffffc90003477a00 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000200 RCX: ffff88802e340000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003477ad0 R08: ffffffff911c460f R09: 1ffffffff22388c1
R10: dffffc0000000000 R11: fffffbfff22388c2 R12: 1ffff9200068ef44
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff9200068ef65
 smp_call_function_single+0x36d/0x5a0 kernel/smp.c:647
 task_function_call kernel/events/core.c:120 [inline]
 perf_install_in_context+0x5be/0x920 kernel/events/core.c:2959
 __do_sys_perf_event_open kernel/events/core.c:12957 [inline]
 __se_sys_perf_event_open+0x1836/0x1c50 kernel/events/core.c:12609
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5d51d9c819
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:00007f5d52c2a028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f5d52015fa0 RCX: 00007f5d51d9c819
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000480
RBP: 00007f5d51e32c91 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5d52016038 R14: 00007f5d52015fa0 R15: 00007ffe393888d8
 </TASK>