rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (9670 ticks this GP) idle=66fc/1/0x4000000000000000 softirq=17478/17478 fqs=5250
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1038362          0            0
rcu: 	cputime:    26579      25920           91   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=8549 q=3833 ncpus=2)
CPU: 0 UID: 0 PID: 6721 Comm: syz.0.342 Not tainted 6.16.0-rc6-syzkaller-00434-gcd7c97f4584a-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:rcu_read_unlock_special+0x87/0x4c0
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 92 37 f8 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900000073a0 EFLAGS: 00000206
RAX: 26929c4ea13c2d00 RBX: 1ffff92000000e7c RCX: 26929c4ea13c2d00
RDX: 0000000000000002 RSI: ffffffff8d9987c6 RDI: ffffffff8be29f80
RBP: ffffc90000007498 R08: ffffffff8fa1eaf7 R09: 1ffffffff1f43d5e
R10: dffffc0000000000 R11: fffffbfff1f43d5f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007f945a13f6c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa64aee56c0 CR3: 00000001207a4000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 unwind_next_frame+0x19ae/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 kmalloc_reserve+0xbd/0x290
 __alloc_skb+0x142/0x2d0
 ndisc_alloc_skb+0x9f/0x480
 ndisc_send_rs+0x2b5/0x630
 addrconf_rs_timer+0x369/0x670
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 5b 22 21 f6 e8 96 f5 57 f6 fb bf 01 00 00 00 <e8> 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000a676540 EFLAGS: 00000286
RAX: 26929c4ea13c2d00 RBX: 0000000000000000 RCX: 26929c4ea13c2d00
RDX: 0000000000000006 RSI: ffffffff8d9987c6 RDI: 0000000000000001
RBP: ffffc9000a6765e0 R08: ffffffff8fa1eaf7 R09: 1ffffffff1f43d5e
R10: dffffc0000000000 R11: fffffbfff1f43d5f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920014ceca8
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:rcu_read_unlock_special+0xef/0x4c0
Code: 41 5e 41 5f 5d c3 cc cc cc cc cc 49 89 ff 48 c7 84 24 80 00 00 00 00 00 00 00 9c 8f 84 24 80 00 00 00 4c 8b a4 24 80 00 00 00 <fa> 41 f7 c4 00 02 00 00 74 0f e8 72 d2 1f 00 66 45 85 f6 0f 84 eb
RSP: 0018:ffffc9000a6766a0 EFLAGS: 00000246
RAX: f2f2f200f1f1f1f1 RBX: 1ffff920014cecdc RCX: 26929c4ea13c2d00
RDX: 0000000000000001 RSI: ffffffff8db864db RDI: ffff888107359cc0
RBP: ffffc9000a6767a0 R08: 0000000000000000 R09: 0000000000000000
R10: ffff888032c025b8 R11: 0000000000000000 R12: 0000000000000246
R13: dffffc0000000000 R14: 0000000080000000 R15: ffff888107359cc0
 __rcu_read_unlock+0x84/0xe0
 rtnl_fill_ifinfo+0x1be8/0x1e70
 rtmsg_ifinfo_build_skb+0x17d/0x260
 rtmsg_ifinfo+0x8c/0x1a0
 __dev_notify_flags+0xf4/0x2e0
 netif_change_flags+0xe8/0x1a0
 do_setlink+0xc55/0x41c0
 rtnl_setlink+0x604/0x900
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x75c/0x8e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f945938e9a9
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:00007f945a13f038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f94595b5fa0 RCX: 00007f945938e9a9
RDX: 0000000000000840 RSI: 00002000000000c0 RDI: 0000000000000011
RBP: 00007f9459410d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f94595b5fa0 R15: 00007ffc3380bf38
 </TASK>
sched: DL replenish lagged too much
