rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=e98c/1/0x4000000000000000 softirq=63048/63049 fqs=5247
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1066791          0            0
rcu: 	cputime:    30962      21527           87   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=51877 q=2457 ncpus=2)
CPU: 1 UID: 0 PID: 15280 Comm: syz.4.2682 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+0x85/0x360
Code: 61 02 09 00 84 c0 75 0d f6 05 57 0b f0 0d 01 0f 84 d7 01 00 00 83 3d 99 56 06 0e 00 0f 84 f0 00 00 00 48 8b b4 24 90 00 00 00 <4c> 89 ef e8 03 a9 85 00 83 3d 7c 56 06 0e 00 0f 84 fa 00 00 00 65
RSP: 0018:ffffc900001e0538 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: a1f997493a783600
RDX: 0000000000000000 RSI: ffffffff8172c1b2 RDI: ffffffff8be332a0
RBP: ffffffff8172c195 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc900001e06f8 R11: ffffffff81ac3930 R12: 0000000000000002
R13: ffffffff8e139ea0 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f115495d6c0(0000) GS:ffff8881a3c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c31a117 CR3: 00000001126a6000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0xc2/0x2390
 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
 __alloc_skb+0x112/0x2d0
 lapb_send_control+0x38/0x3e0
 lapb_t1timer_expiry+0x699/0xab0
 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 fb 88 15 f6 e8 36 e3 4c f6 fb bf 01 00 00 00 <e8> 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc90008417ac0 EFLAGS: 00000282
RAX: a1f997493a783600 RBX: 0000000000000000 RCX: a1f997493a783600
RDX: 0000000000000000 RSI: ffffffff8d9b6ad4 RDI: 0000000000000001
RBP: ffffc90008417b60 R08: ffffffff8fa38137 R09: 1ffffffff1f47026
R10: dffffc0000000000 R11: fffffbfff1f47027 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92001082f58
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:do_vfs_ioctl+0x8f0/0x1430
Code: e8 d5 68 86 ff 45 31 ff 8b 7c 24 18 31 f6 e8 27 58 03 00 eb 15 e8 c0 68 86 ff 4c 89 f7 48 8b 74 24 10 e8 53 5b 0c 00 41 89 c7 <49> bc 00 00 00 00 00 fc ff df 48 c7 44 24 20 0e 36 e0 45 43 c7 44
RSP: 0018:ffffc90008417c20 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000008e53b02 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc90008417ea8 R08: ffff88810347f837 R09: 1ffff1102068ff06
R10: dffffc0000000000 R11: ffffed102068ff07 R12: ffffffff8b93f708
R13: 1ffff92001082f88 R14: ffff888110123c00 R15: 0000000000000000
 __se_sys_ioctl+0x82/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1153b8ebe9
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:00007f115495d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1153dc5fa0 RCX: 00007f1153b8ebe9
RDX: 00002000000006c0 RSI: 0000000000005452 RDI: 0000000000000003
RBP: 00007f1153c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1153dc6038 R14: 00007f1153dc5fa0 R15: 00007ffca50aedb8
 </TASK>
sched: DL replenish lagged too much
clocksource: Long readout interval, skipping watchdog check: cs_nsec: 104753812699 wd_nsec: 104753814965
