rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (6872 ticks this GP) idle=4004/1/0x4000000000000000 softirq=26847/26847 fqs=4768
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1229621          0            0
rcu: 	cputime:     8190      44309           36   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=22925 q=4084 ncpus=2)
CPU: 0 UID: 0 PID: 8258 Comm: syz.4.588 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:__read_once_word_nocheck+0x3/0x10
Code: e8 d2 af b9 00 e9 1b fd ff ff 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 48 8b 07 <c3> cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000006df8 EFLAGS: 00000202
RAX: ffffffff8b0b8144 RBX: 1ffff92000000dd6 RCX: 1ffff92000000d01
RDX: ffffc90000007e80 RSI: 0000000000000002 RDI: ffffc90000007e80
RBP: 1ffffffff22c3cc4 R08: ffffc90000007e88 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8e95c700 R12: 1ffff92000000dd7
R13: ffffc90000008000 R14: ffffc90000006ea8 R15: ffffc90000000000
FS:  00007f6dfd4886c0(0000) GS:ffff88818dcb8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c34f82c CR3: 00000001b512c000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0xca5/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x358/0x750
 cfg80211_inform_single_bss_data+0x990/0x1be0
 cfg80211_inform_bss_data+0x26e/0x3d80
 cfg80211_inform_bss_frame_data+0x3c7/0x730
 ieee80211_bss_info_update+0x791/0xa50
 ieee80211_scan_rx+0x552/0xa40
 ieee80211_rx_list+0x2a11/0x3740
 ieee80211_rx_napi+0x1ad/0x3d0
 ieee80211_handle_queued_frames+0xe4/0x1d0
 tasklet_action_common+0x2da/0x4a0
 handle_softirqs+0x225/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:strlen+0x2e/0x70
Code: 41 57 41 56 41 54 53 48 c7 c0 ff ff ff ff 49 be 00 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 <84> c0 75 11 48 ff c3 49 8d 47 01 42 80 7c 3f 01 00 75 de eb 19 89
RSP: 0018:ffffc90008edfa58 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffffffff8bd732a0 RCX: 0000000000000000
RDX: ffffffff81fb0eca RSI: ffff88810d6eee70 RDI: ffffffff8bd732a0
RBP: ffffc90008edfb68 R08: ffffffff902f72f7 R09: 1ffffffff205ee5e
R10: dffffc0000000000 R11: fffffbfff205ee5f R12: dffffc0000000000
R13: ffffffff81fb0eca R14: dffffc0000000000 R15: ffffffffffffffff
 perf_trace_lock+0xd5/0x410
 lock_release+0x38e/0x3c0
 __mutex_unlock_slowpath+0xd4/0x6f0
 __se_sys_perf_event_open+0x1a8a/0x1d40
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6dfc59ce59
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:00007f6dfd488028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f6dfc815fa0 RCX: 00007f6dfc59ce59
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000200
RBP: 00007f6dfc632e6f R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6dfc816038 R14: 00007f6dfc815fa0 R15: 00007ffd86f8d198
 </TASK>
sched: DL replenish lagged too much
