rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=e0bc/1/0x4000000000000000 softirq=14689/14690 fqs=4504
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1065930          0            0
rcu: 	cputime:    31102      21384           50   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=8149 q=3783 ncpus=2)
CPU: 0 UID: 0 PID: 6283 Comm: syz.4.86 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:_raw_spin_unlock_irqrestore+0xa8/0x110
Code: 74 05 e8 7b 2a 6b 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> 53 ae 32 f6 65 8b 05 ec 50 20 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc90000006ee0 EFLAGS: 00000206
RAX: 0dd3c6dcf2cb1800 RBX: 0000000000000a02 RCX: 0dd3c6dcf2cb1800
RDX: 0000000000000002 RSI: ffffffff8d792409 RDI: 0000000000000001
RBP: ffffc90000006f60 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee
R10: dffffc0000000000 R11: fffffbfff1f043ef R12: dffffc0000000000
R13: ffff888191af1200 R14: ffffffff99ac2208 R15: 1ffff92000000ddc
FS:  00007f7e885cf6c0(0000) GS:ffff88818e835000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32213ff8 CR3: 000000011179a000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 kvfree_call_rcu+0xe1/0x480
 cfg80211_update_known_bss+0x830/0x1590
 __cfg80211_bss_update+0x147/0x2110
 cfg80211_inform_single_bss_data+0xbc8/0x1ad0
 cfg80211_inform_bss_data+0x203/0x3b40
 cfg80211_inform_bss_frame_data+0x3c7/0x710
 ieee80211_bss_info_update+0x749/0x9e0
 ieee80211_scan_rx+0x593/0xa20
 ieee80211_rx_list+0x2485/0x2f90
 ieee80211_rx_napi+0x1a8/0x3d0
 ieee80211_handle_queued_frames+0xe8/0x1e0
 tasklet_action_common+0x358/0x550
 handle_softirqs+0x27d/0x850
 __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:trace_sched_exit_tp+0x0/0xf0
Code: 80 c1 03 38 c1 0f 8c 7b fe ff ff 48 8b 7d b0 e8 56 fe 95 00 e9 6d fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 53 66 90 65 8b 05 09 95 ec 10 83 f8 08 73 32 89 c3 c1 e8 06 48
RSP: 0018:ffffc900058875f8 EFLAGS: 00000287
RAX: 0000000000000000 RBX: ffff888109851d40 RCX: 0dd3c6dcf2cb1800
RDX: 0000000000000006 RSI: ffffffff8d792409 RDI: 0000000000000001
RBP: ffffc90005887810 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee
R10: dffffc0000000000 R11: fffffbfff1f043ef R12: dffffc0000000000
R13: ffff88816bc33a80 R14: ffff88812103a910 R15: 1ffff11024207686
 __schedule+0x14d2/0x5000
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x5d8/0x660
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:schedule+0x124/0x360
Code: f6 47 01 10 0f 85 55 01 00 00 4c 8d bb c8 12 00 00 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 ef 2a cb f6 49 8b 3f <48> 85 ff 74 0a be 01 00 00 00 e8 7d 29 10 f9 48 c7 c7 20 cf df 8d
RSP: 0018:ffffc900058879e8 EFLAGS: 00000246
RAX: 1ffff1102130a601 RBX: ffff888109851d40 RCX: 0dd3c6dcf2cb1800
RDX: 0000000096996660 RSI: ffffffff8d97916f RDI: 0000000000000000
RBP: 1ffff1102130a3ab R08: ffffffff8b5cee11 R09: ffffffff8ddfcf20
R10: 0000000000000003 R11: 0000000000000002 R12: ffff888109851d6c
R13: dffffc0000000000 R14: ffffffff8b5cee11 R15: ffff888109853008
 __futex_wait+0x1c3/0x3d0
 futex_wait+0x104/0x360
 do_futex+0x333/0x420
 __se_sys_futex+0x36f/0x400
 do_syscall_64+0xfa/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7e8778f7c9
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:00007f7e885cf0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f7e879e5fa8 RCX: 00007f7e8778f7c9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7e879e5fa8
RBP: 00007f7e879e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7e879e6038 R14: 00007fffc6d24f30 R15: 00007fffc6d25018
 </TASK>
sched: DL replenish lagged too much
