rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (5341 ticks this GP) idle=79a4/1/0x4000000000000000 softirq=23505/23505 fqs=4892
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1003505          2            0
rcu: 	cputime:    37501      14988           48   ==> 52500(ms)
rcu: 	(t=10501 jiffies g=16665 q=2638 ncpus=2)
CPU: 0 UID: 0 PID: 7884 Comm: syz.1.529 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_next_frame+0x138f/0x23d0
Code: 14 24 4d 89 3c 24 41 0f b6 44 2d 00 84 c0 0f 85 09 0e 00 00 c6 03 00 4c 8b 64 24 48 4c 8b 7c 24 28 48 8b 44 24 40 0f b6 04 28 <84> c0 0f 85 73 0b 00 00 41 0f b6 04 2f 84 c0 0f 85 8a 0b 00 00 0f
RSP: 0000:ffffc90000006b18 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90000006c20 RCX: 0000000000000000
RDX: ffffffff90b15d3a RSI: 0000000000000000 RDI: ffffc90000006c48
RBP: dffffc0000000000 R08: ffffc90000006c47 R09: 0000000000000000
R10: ffffc90000006c38 R11: fffff52000000d89 R12: ffffc90000006c38
R13: 1ffff92000000d7f R14: ffffc90000006be8 R15: 1ffffffff2162ba7
FS:  00007f85653026c0(0000) GS:ffff88818e835000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 0000000113f9e000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 kvfree_call_rcu+0x11b/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:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 10 00 00 00 74 64 bf 01 00 00 00 e8 ab 16 34 f6 e8 46 94 6c f6 fb bf 01 00 00 00 <e8> 1b a8 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0000:ffffc9000701fd20 EFLAGS: 00000282
RAX: afc62fe3bf3b1c00 RBX: 0000000000000000 RCX: afc62fe3bf3b1c00
RDX: 0000000000000000 RSI: ffffffff8d792409 RDI: 0000000000000001
RBP: ffffc9000701fdd0 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee
R10: dffffc0000000000 R11: fffffbfff1f043ef R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000e03fa4
 irqentry_exit+0x5d8/0x660
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:its_return_thunk+0x0/0x10
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc <c3> cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e9 4b 73 d4 f5 cc
RSP: 0000:ffffc9000701fee8 EFLAGS: 00000282
RAX: afc62fe3bf3b1c00 RBX: ffff888120563a80 RCX: afc62fe3bf3b1c00
RDX: 0000000000000000 RSI: ffffffff8d792409 RDI: ffffffff8bc082e0
RBP: 00000000ffffe000 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee
R10: dffffc0000000000 R11: fffffbfff1f043ef R12: 000000009fffffff
R13: 0000000000000010 R14: ffffc9000701ff48 R15: ffffc9000701ff08
 irqentry_exit+0x14a/0x660
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0033:0x7f856438f7b0
Code: 05 48 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 ff ff 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
RSP: 002b:00007f85653020e8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f85645e5fa8 RCX: 00000000000f4240
RDX: 0000000000000081 RSI: 00007f85645e5fac RDI: 00000000000000ca
RBP: 00007f85645e5fa0 R08: 0000000000000003 R09: 3fffffffffffffff
R10: 4000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f85645e6038 R14: 00007ffe3d397630 R15: 00007ffe3d397718
 </TASK>
sched: DL replenish lagged too much
