rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10478 ticks this GP) idle=a524/1/0x4000000000000000 softirq=20254/20255 fqs=4867
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1268196          0            0
rcu: 	cputime:     7896      44583           35   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=16109 q=6035 ncpus=2)
CPU: 1 UID: 0 PID: 7464 Comm: syz.0.512 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+0x205/0x2550
Code: 6c 04 00 00 44 89 f8 4c 8d 2c 85 bc d8 6e 91 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 4c 89 e3 0f 85 66 1d 00 00 45 8b 6d 00 <44> 89 f8 ff c0 4c 8d 24 85 bc d8 6e 91 4c 89 e0 48 c1 e8 03 0f b6
RSP: 0018:ffffc90000a07cc0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000300
RDX: 00000000000aa605 RSI: ffffffff8c289780 RDI: ffffffff8c289740
RBP: ffffffff8aefade6 R08: ffffffff81769f7f R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8e95c700 R12: dffffc0000000000
R13: 00000000001b8514 R14: ffffc90000a07d68 R15: 000000000009efad
FS:  00007f7aade766c0(0000) GS:ffff8882a92b8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9a25945000 CR3: 0000000115232000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x40/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x640
 ieee80211_inform_bss+0xbda/0x10d0
 cfg80211_inform_single_bss_data+0xd9c/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:preempt_schedule_irq+0x48/0xa0
Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 d3 17 f0 f5 e8 5e 13 2a f6 fb bf 01 00 00 00 <e8> f3 a1 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 24 15 2a f6 bf 01
RSP: 0018:ffffc90003b1f808 EFLAGS: 00000206
RAX: 000000000011aed7 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000007 RSI: ffffffff8dfa1050 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff902f72f7 R09: 1ffffffff205ee5e
R10: dffffc0000000000 R11: fffffbfff205ee5f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
 irqentry_exit+0x14f/0x8e0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:mas_find+0x37/0xcf0
Code: 53 48 83 ec 28 48 89 f5 49 89 fe 49 bd 00 00 00 00 00 fc ff df e8 59 82 2a f6 4d 8d 7e 48 4c 89 fb 48 c1 eb 03 42 0f b6 04 2b <84> c0 0f 85 44 0b 00 00 45 8b 27 4c 89 e7 48 c7 c6 e0 4a 16 90 e8
RSP: 0018:ffffc90003b1f920 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: 1ffff92000763f4d RCX: ffff888102b01dc0
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: ffffc90003b1fa20
RBP: ffffffffffffffff R08: ffff888102b01dc0 R09: 0000000000000005
R10: 0000000000000004 R11: 0000000000000000 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffc90003b1fa20 R15: ffffc90003b1fa68
 acct_collect+0x20d/0x7b0
 do_exit+0x640/0x2360
 do_group_exit+0x22d/0x2f0
 get_signal+0x121b/0x12c0
 arch_do_signal_or_restart+0xbb/0x860
 exit_to_user_mode_loop+0xa9/0x6b0
 do_syscall_64+0x353/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7aacf9ce59
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:00007f7aade76028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: 0000000000000008 RBX: 00007f7aad215fa0 RCX: 00007f7aacf9ce59
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000480
RBP: 00007f7aad032e6f R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7aad216038 R14: 00007f7aad215fa0 R15: 00007ffc878f1088
 </TASK>
sched: DL replenish lagged too much
