rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (8867 ticks this GP) idle=4544/1/0x4000000000000000 softirq=18012/18012 fqs=4335
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   907876          0            0
rcu: 	cputime:    34439      18039           52   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=10521 q=4081 ncpus=2)
CPU: 0 UID: 0 PID: 6741 Comm: syz.1.356 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: b0 00 48 ba 00 00 00 00 00 fc ff df e9 88 fc ff ff 66 0f 1f 44 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:ffffc90000006b90 EFLAGS: 00000202
RAX: ffffffff8aea8616 RBX: ffffc90000007838 RCX: 1ffff92000000d01
RDX: ffffffff90d0abd6 RSI: 0000000000000002 RDI: ffffc90000007838
RBP: 1ffff92000000d8e R08: 0000000000000007 R09: ffffffff8172c195
R10: ffffc90000006cb8 R11: ffffffff81ac3930 R12: ffffc90000008000
R13: 1ffff92000000d8f R14: ffffc90000006c68 R15: ffffc90000000000
FS:  00007fd40ecbc6c0(0000) GS:ffff8880b861c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1afa254381 CR3: 000000003c844000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000602
Call Trace:
 <IRQ>
 unwind_next_frame+0xc3c/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+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:finish_task_switch+0x26b/0x950
Code: 0f 84 3c 01 00 00 48 85 db 0f 85 63 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 2f c7 ea 09 e8 5a 3f 36 00 fb 4c 8b 65 c0 <49> 8d bc 24 18 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90006886d58 EFLAGS: 00000282
RAX: 97c8d044fc568d00 RBX: 0000000000000000 RCX: 97c8d044fc568d00
RDX: 0000000000000000 RSI: ffffffff8d9b6a5f RDI: ffffffff8be33300
RBP: ffffc90006886db0 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: ffff88801f655640
R13: dffffc0000000000 R14: ffff88801f4f3980 R15: ffff88804b03ab58
 __schedule+0x17a0/0x4cc0
 preempt_schedule_common+0x83/0xd0
 preempt_schedule+0xae/0xc0
 preempt_schedule_thunk+0x16/0x30
 _raw_spin_unlock_irqrestore+0xfd/0x110
 rcu_preempt_deferred_qs_irqrestore+0x8bd/0xce0
 rcu_read_unlock_special+0x475/0x5e0
 __rcu_read_unlock+0x84/0xe0
 get_mem_cgroup_from_objcg+0x1b0/0x1d0
 obj_cgroup_charge_pages+0xe/0xa0
 obj_cgroup_charge_account+0xcf/0x660
 __memcg_slab_post_alloc_hook+0x3e6/0x7f0
 __kvmalloc_node_noprof+0x466/0x5f0
 bpf_check+0xf20/0x1d2e0
 bpf_prog_load+0x1318/0x1930
 __sys_bpf+0x528/0x870
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd40dd8ebe9
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:00007fd40ecbc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fd40dfc5fa0 RCX: 00007fd40dd8ebe9
RDX: 0000000000000094 RSI: 00002000000000c0 RDI: 0000000000000005
RBP: 00007fd40de11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd40dfc6038 R14: 00007fd40dfc5fa0 R15: 00007ffec7bec008
 </TASK>
sched: DL replenish lagged too much
