rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10472 ticks this GP) idle=e03c/1/0x4000000000000000 softirq=16908/16909 fqs=4627
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1050444          0            0
rcu: 	cputime:    31893      20606           91   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=10269 q=4166 ncpus=2)
CPU: 0 UID: 0 PID: 6605 Comm: syz.2.245 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+0x130e/0x2390
Code: c1 e8 3f 48 01 c8 48 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 27 49 63 07 4c 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 49
RSP: 0000:ffffc90000006b98 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: ffffffff8fb18554 RCX: dffffc0000000000
RDX: ffffffff8fb184f8 RSI: ffffffff902a9120 RDI: ffffffff8be332a0
RBP: ffffffff8fb184f8 R08: 0000000000000018 R09: ffffffff8172c195
R10: ffffc90000006cb8 R11: ffffffff81ac3930 R12: ffffffff810014c9
R13: ffffffff8fb184f8 R14: ffffc90000006c68 R15: ffffffff8fb18524
FS:  00007f2e17bdd6c0(0000) GS:ffff8880b861c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010e6f8000 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+0xbb/0x410
 cfg80211_update_known_bss+0x634/0x1330
 __cfg80211_bss_update+0x147/0x2120
 cfg80211_inform_single_bss_data+0xba9/0x1ac0
 cfg80211_inform_bss_data+0x1fb/0x3b30
 cfg80211_inform_bss_frame_data+0x3d7/0x730
 ieee80211_bss_info_update+0x746/0x9e0
 ieee80211_scan_rx+0x593/0xa20
 ieee80211_rx_list+0x201c/0x2a90
 ieee80211_rx_napi+0x1a8/0x3d0
 ieee80211_handle_queued_frames+0xe8/0x1f0
 tasklet_action_common+0x36c/0x580
 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_rq_unlock_irq+0x13/0x90
Code: cc e8 21 08 e7 09 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 53 66 90 e8 c4 9e e9 09 e8 ef 26 35 00 fb 5b <41> 5e 41 5f c3 cc cc cc cc cc f3 0f 1e fa 49 be 00 00 00 00 00 fc
RSP: 0000:ffffc9000694fcc8 EFLAGS: 00000282
RAX: 8c6d05fdba547e00 RBX: ffff88804b039f80 RCX: 8c6d05fdba547e00
RDX: 0000000000000000 RSI: ffffffff8d9b6a0a RDI: ffffffff8be33300
RBP: ffffc9000694fef0 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff888106c89cc0 R15: 1ffff11009607551
 __schedule+0x19e0/0x4cc0
 schedule+0x165/0x360
 irqentry_exit_to_user_mode+0x5d/0x120
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0033:0x7f2e16d8ebe9
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:00007f2e17bdd0e8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f2e16fb5fa8 RCX: 00007f2e16d8ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f2e16fb5fa8
RBP: 00007f2e16fb5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2e16fb6038 R14: 00007ffee1d827e0 R15: 00007ffee1d828c8
 </TASK>
sched: DL replenish lagged too much
