rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=ab8c/1/0x4000000000000000 softirq=30522/30535 fqs=5083
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1241773          0            0
rcu: 	cputime:    30541      21938           78   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=22953 q=2979 ncpus=2)
CPU: 0 UID: 0 PID: 8224 Comm: syz.4.636 Not tainted syzkaller #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:__unwind_start+0x67/0x760
Code: 4d 89 f7 49 c1 ef 03 41 80 3c 17 00 74 12 4c 89 f7 e8 8d a4 b0 00 48 ba 00 00 00 00 00 fc ff df 4d 89 2e 80 3d 5d 38 4b 0c 01 <75> 2f 65 48 8b 04 25 08 e0 a0 92 49 39 c5 74 69 49 8d 6d 34 48 89
RSP: 0018:ffffc90000007248 EFLAGS: 00000246
RAX: ffffc900000072a8 RBX: ffffc900000072a8 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffc90000007308
RBP: ffffc90000007330 R08: ffffc90000007307 R09: 0000000000000000
R10: ffffc900000072a8 R11: fffff52000000e61 R12: 0000000000000000
R13: ffff888022670000 R14: ffffc900000072d0 R15: 1ffff92000000e5a
FS:  00007fc86e2486c0(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f28ace8ffc8 CR3: 00000001122fa000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 arch_stack_walk+0xe4/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 ref_tracker_alloc+0x133/0x460
 dst_init+0xd9/0x450
 dst_alloc+0x12a/0x170
 icmp6_dst_alloc+0x75/0x420
 ndisc_send_skb+0x41f/0x1440
 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:finish_task_switch+0x26b/0x950
Code: 0f 84 3c 01 00 00 48 85 db 0f 85 63 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 8f 65 ec 09 e8 0a 52 36 00 fb 4c 8b 65 c0 <49> 8d bc 24 18 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90002abf198 EFLAGS: 00000282
RAX: 8497dfbe0d6f0900 RBX: 0000000000000000 RCX: 8497dfbe0d6f0900
RDX: 0000000000000007 RSI: ffffffff8d9ba3cb RDI: ffffffff8be33e00
RBP: ffffc90002abf1f0 R08: ffffffff8fa3a837 R09: 1ffffffff1f47506
R10: dffffc0000000000 R11: fffffbfff1f47507 R12: ffff888022670000
R13: dffffc0000000000 R14: ffff88801c2f1cc0 R15: ffff88804b03ab58
 __schedule+0x17a0/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:up_read+0x5/0x20
Code: fd ff ff 48 c7 c7 60 d9 a3 8f e8 56 a0 86 00 e9 b7 fd ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 53 <48> 89 fb 48 83 c7 70 48 8b 74 24 08 e8 da 82 00 00 48 89 df 5b eb
RSP: 0018:ffffc90002abf588 EFLAGS: 00000286
RAX: ffffffff8173e120 RBX: 0000000000000007 RCX: 0000000000080000
RDX: ffffc9002169a000 RSI: 000000000000a8c6 RDI: ffff888109f096f0
RBP: ffff8881106bf380 R08: ffffffff8fa3a837 R09: 1ffffffff1f47506
R10: dffffc0000000000 R11: fffffbfff1f47507 R12: 0000000000000000
R13: 000020000010f000 R14: 0000000000000000 R15: 0000000000000214
 do_user_addr_fault+0xbc1/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:rep_movs_alternative+0x75/0x90
Code: 05 c3 cc cc cc cc 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 c7 48 01 c6 48 29 c1 48 89 c8 48 c1 e9 03 83 e0 07 <f3> 48 a5 89 c1 85 c9 75 91 c3 cc cc cc cc 48 8d 0c c8 eb 86 cc cc
RSP: 0018:ffffc90002abf738 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888120bd0000 RCX: 0000000000000228
RDX: 0000000000000001 RSI: 000020000010f000 RDI: ffff888120bd6ec0
RBP: ffffc90002abf8b0 R08: ffff888120bd7fff R09: 1ffff1102417afff
R10: dffffc0000000000 R11: ffffed102417b000 R12: 1ffff92000557f77
R13: 0000200000108140 R14: ffffc90002abfbc8 R15: 0000000000008000
 _copy_from_iter+0x24f/0x1790
 kcm_sendmsg+0xf00/0x2ad0
 __sock_sendmsg+0x21c/0x270
 sock_write_iter+0x258/0x330
 vfs_write+0x5c9/0xb30
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc86d38eba9
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:00007fc86e248038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fc86d5d5fa0 RCX: 00007fc86d38eba9
RDX: 00000000fffffdef RSI: 0000200000000140 RDI: 0000000000000006
RBP: 00007fc86d411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc86d5d6038 R14: 00007fc86d5d5fa0 R15: 00007fffc1634958
 </TASK>
sched: DL replenish lagged too much
