rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10485 ticks this GP) idle=aec4/1/0x4000000000000000 softirq=16755/16764 fqs=4788
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1218203         41            0
rcu: 	cputime:    29714      22784           39   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=10253 q=6303 ncpus=2)
CPU: 1 UID: 0 PID: 6514 Comm: syz.0.175 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:lock_acquire+0x175/0x360
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 4b e3 02 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900001e09c0 EFLAGS: 00000206
RAX: 7f9104ba47793b00 RBX: 0000000000000000 RCX: 7f9104ba47793b00
RDX: 0000000000000000 RSI: ffffffff8dba5d03 RDI: ffffffff8be33300
RBP: ffffffff89659405 R08: 0000000000000000 R09: ffffffff89659405
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: 0000000000000000
R13: ffff88813663ba68 R14: 0000000000000001 R15: 0000000000000246
FS:  00007f33065646c0(0000) GS:ffff8881a3c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3306563fc8 CR3: 000000011229a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 process_backlog+0x7ba/0x14f0
 __napi_poll+0xc7/0x360
 net_rx_action+0x707/0xe30
 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:_raw_spin_unlock_irqrestore+0xa8/0x110
Code: 74 05 e8 4b 77 4b f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 93 1e 14 f6 65 8b 05 6c 61 24 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc9000692fc60 EFLAGS: 00000206
RAX: 7f9104ba47793b00 RBX: 0000000000000a06 RCX: 7f9104ba47793b00
RDX: 0000000000000006 RSI: ffffffff8d9b6a7d RDI: 0000000000000001
RBP: ffffc9000692fcf0 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: dffffc0000000000
R13: ffff8880236babc0 R14: ffff88811238e800 R15: 1ffff92000d25f8c
 __se_sys_perf_event_open+0x1942/0x1d70
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f330578ebe9
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:00007f3306564038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f33059c6090 RCX: 00007f330578ebe9
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000003c0
RBP: 00007f3305811e19 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f33059c6128 R14: 00007f33059c6090 R15: 00007fff99606138
 </TASK>
sched: DL replenish lagged too much
