rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10483 ticks this GP) idle=8954/1/0x4000000000000000 softirq=15058/15067 fqs=4452
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   942302          0            0
rcu: 	cputime:    32836      19642           55   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=7661 q=5037 ncpus=2)
CPU: 0 UID: 0 PID: 6044 Comm: syz.2.40 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:lock_acquire+0x58/0x360
Code: 8b 05 bc 60 03 11 48 89 44 24 58 0f 1f 44 00 00 65 8b 05 bf 60 03 11 83 f8 08 0f 83 b8 01 00 00 89 c0 48 0f a3 05 a8 3a 06 0e <73> 16 e8 61 02 09 00 84 c0 75 0d f6 05 d4 1e f0 0d 01 0f 84 d7 01
RSP: 0018:ffffc90000006af8 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e13a120
RBP: ffffffff8172d195 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90000006cb8 R11: ffffffff81ac4d00 R12: 0000000000000002
R13: ffffffff8e13a120 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fc114beb6c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc113fd7dac CR3: 0000000121256000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 00000000000d0602
Call Trace:
 <IRQ>
 unwind_next_frame+0xc2/0x2390
 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+0x84b/0x13c0
 __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:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 ab 7a 14 f6 e8 76 d7 4b f6 fb bf 01 00 00 00 <e8> 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc900045af380 EFLAGS: 00000282
RAX: 18f6dda52fb23100 RBX: 0000000000000000 RCX: 18f6dda52fb23100
RDX: 0000000000000000 RSI: ffffffff8d9ba2f8 RDI: 0000000000000001
RBP: ffffc900045af420 R08: ffffffff8fa3aa37 R09: 1ffffffff1f47546
R10: dffffc0000000000 R11: fffffbfff1f47547 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920008b5e70
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:percpu_ref_put+0xea/0x180
Code: 74 28 80 3d d4 74 61 0d 00 75 1f c6 05 cb 74 61 0d 01 48 c7 c7 00 50 98 8b be 66 03 00 00 48 c7 c2 a0 50 98 8b e8 b6 9f 71 ff <48> c7 c7 20 a1 13 8e 48 89 de e8 97 85 71 ff 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900045af4e0 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff822bf9e9 RCX: 18f6dda52fb23100
RDX: 0000000000000001 RSI: ffffffff8be33e60 RDI: ffffffff8be33e20
RBP: ffff88802638c900 R08: 0000000000000000 R09: ffffffff822bf9e9
R10: 0000000000000406 R11: 0000000000000000 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff8881000f8d10 R15: ffff8881000f8d4c
 __memcg_slab_post_alloc_hook+0x171/0x7f0
 kmem_cache_alloc_lru_noprof+0x2c7/0x3d0
 __d_alloc+0x36/0x7a0
 path_from_stashed+0x384/0x5c0
 perf_event_namespaces+0x242/0x920
 perf_event_fork+0x152/0x7d0
 copy_process+0x386a/0x3c00
 kernel_clone+0x21e/0x840
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc113d8eba9
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:00007fc114beafe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fc113fd5fa0 RCX: 00007fc113d8eba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc113e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc113fd6038 R14: 00007fc113fd5fa0 R15: 00007ffdbba2eb08
 </TASK>
sched: DL replenish lagged too much
