rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (8629 ticks this GP) idle=8dfc/1/0x4000000000000000 softirq=21955/21956 fqs=4914
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   982312          6            0
rcu: 	cputime:    37342      15147           49   ==> 52500(ms)
rcu: 	(t=10501 jiffies g=16177 q=14849 ncpus=2)
CPU: 1 UID: 0 PID: 7324 Comm: syz.6.304 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:rcu_is_watching+0x0/0xb0
Code: c7 c7 60 3a 76 8e e8 9f 59 40 03 eb cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 41 57 41 56 53 65 ff 05 80 1e 71 11 e8 eb 5a 03 0a 89
RSP: 0018:ffffc90000a07be8 EFLAGS: 00000297
RAX: 0000000000000001 RBX: ffffffff9144d401 RCX: 0000000000000303
RDX: ffffc90000a07d01 RSI: ffffffff81767de5 RDI: ffffffff8e75e3e0
RBP: dffffc0000000000 R08: ffffc90000a08b50 R09: 0000000000000000
R10: ffffc90000a07d78 R11: fffff52000140fb1 R12: ffffc90000a08b60
R13: ffffffff81767de5 R14: ffffffff8e75e3e0 R15: ffffffff81767de5
FS:  00007f455e5d56c0(0000) GS:ffff8882a9463000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f455e5d4ff8 CR3: 00000001b885e000 CR4: 00000000000006f0
DR0: 0000200000000100 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_release+0x4b/0x3d0
 unwind_next_frame+0x1aaa/0x23c0
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 kvfree_call_rcu+0xff/0x430
 cfg80211_update_known_bss+0x830/0x1590
 __cfg80211_bss_update+0x147/0x2110
 cfg80211_inform_single_bss_data+0xbd1/0x1b70
 cfg80211_inform_bss_data+0x266/0x3c40
 cfg80211_inform_bss_frame_data+0x3c7/0x760
 ieee80211_bss_info_update+0x794/0xa40
 ieee80211_scan_rx+0x552/0xa40
 ieee80211_rx_list+0x29e5/0x3710
 ieee80211_rx_napi+0x1b1/0x3e0
 ieee80211_handle_queued_frames+0xe8/0x1e0
 tasklet_action_common+0x2da/0x4b0
 handle_softirqs+0x22a/0x870
 __irq_exit_rcu+0x5f/0x150
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:finish_task_switch+0x245/0x920
Code: 00 00 48 85 db 0f 85 e8 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 49 83 c4 48 4c 89 e7 e8 85 99 1b 0a e8 b0 8e 38 00 fb 4c 8b 65 c0 <49> 8d bc 24 70 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc900017bf7d8 EFLAGS: 00000202
RAX: 0000000000012251 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8def4b7d RDI: ffffffff8c27b400
RBP: ffffc900017bf830 R08: ffffffff90118bb7 R09: 1ffffffff2023176
R10: dffffc0000000000 R11: fffffbfff2023177 R12: ffff88801f609d40
R13: dffffc0000000000 R14: ffff8881604ad7c0 R15: ffff88823c63b918
 __schedule+0x15e5/0x52d0
 preempt_schedule_common+0x82/0xd0
 preempt_schedule_thunk+0x16/0x30
 smp_call_function_single+0x469/0x580
 perf_install_in_context+0x5c0/0x930
 __se_sys_perf_event_open+0x192f/0x1d60
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f456039c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f455e5d5028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f4560616090 RCX: 00007f456039c799
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000012c0
RBP: 00007f4560432c99 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4560616128 R14: 00007f4560616090 R15: 00007ffc9e588a18
 </TASK>
sched: DL replenish lagged too much
