rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10484 ticks this GP) idle=32dc/1/0x4000000000000000 softirq=13359/13364 fqs=4756
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1225765          2            0
rcu: 	cputime:    33460      19029           42   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=8593 q=2999 ncpus=2)
CPU: 0 UID: 0 PID: 5993 Comm: syz.2.26 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:get_stack_info+0x0/0xf0
Code: 1a 0a cc 31 c0 e9 10 35 1a 0a cc 66 66 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 <0f> 1f 40 d6 41 57 41 56 41 55 41 54 53 48 89 cb 49 89 d6 49 89 f7
RSP: 0018:ffffc90000006b50 EFLAGS: 00000246
RAX: 1ffff92000000d8a RBX: ffffc90003bbe7b0 RCX: ffffc90000006c48
RDX: ffffc90000006c28 RSI: ffff888029699d00 RDI: ffffc90003bbe7b0
RBP: 1ffff92000000d86 R08: 000000000000000e R09: ffffffff81742d25
R10: ffffc90000006c78 R11: ffffffff81acd5a0 R12: ffffc90000008000
R13: 1ffff92000000d87 R14: ffffc90000006c28 R15: ffffc90000000000
FS:  00007f12c11d46c0(0000) GS:ffff8880b8403000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001182d6000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 unwind_next_frame+0xba5/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 kvfree_call_rcu+0x130/0x4c0
 cfg80211_update_known_bss+0x830/0x1590
 __cfg80211_bss_update+0x147/0x2120
 cfg80211_inform_single_bss_data+0xba9/0x1ac0
 cfg80211_inform_bss_data+0x203/0x3b40
 cfg80211_inform_bss_frame_data+0x3d7/0x730
 ieee80211_bss_info_update+0x749/0x9e0
 ieee80211_scan_rx+0x593/0xa20
 ieee80211_rx_list+0x210c/0x2b90
 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:rcu_read_unlock_special+0x87/0x4b0
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 82 1d 1a 11 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc90003bbe860 EFLAGS: 00000206
RAX: 8fd4ac1f6b57d800 RBX: 1ffff92000777d10 RCX: 8fd4ac1f6b57d800
RDX: 0000000000000007 RSI: ffffffff8db9e917 RDI: ffffffff8c03d4e0
RBP: ffffc90003bbe938 R08: ffffffff8fc34377 R09: 1ffffffff1f8686e
R10: dffffc0000000000 R11: fffffbfff1f8686f R12: ffffffff8e342600
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x84/0xe0
 unwind_next_frame+0x19ae/0x2390
 __unwind_start+0x5b9/0x760
 arch_stack_walk+0xe4/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 call_rcu+0x157/0x9c0
 __schedule+0x17a0/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_schedule_thunk+0x4/0x30
Code: c7 c0 40 59 a0 8b e9 9b 5c 4d 0a cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 <57> 56 52 51 50 41 50 41 51 41 52 41 53 e8 1a a0 4b 0a 41 5b 41 5a
RSP: 0018:ffffc90003bbf310 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000a06 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffffffff8db9e917 RDI: 00000000ffffffff
RBP: ffffc90003bbf310 R08: ffffffff8fc34377 R09: 1ffffffff1f8686e
R10: dffffc0000000000 R11: fffffbfff1f8686f R12: dffffc0000000000
R13: ffffffff8e342680 R14: ffffffff8e342ec0 R15: 1ffff92000777e64
 _raw_spin_unlock_irqrestore+0xfd/0x110
 rcu_preempt_deferred_qs_irqrestore+0x8bd/0xce0
 rcu_read_unlock_special+0x3a2/0x4b0
 __rcu_read_unlock+0x84/0xe0
 unwind_next_frame+0x19ae/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x411/0x7f0
 tomoyo_encode+0x28b/0x550
 tomoyo_realpath_from_path+0x58d/0x5d0
 tomoyo_path_number_perm+0x1e8/0x5a0
 security_file_ioctl+0xcb/0x2d0
 __se_sys_ioctl+0x47/0x170
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f12c038ec29
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:00007f12c11d4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f12c05d5fa0 RCX: 00007f12c038ec29
RDX: 0000200000000040 RSI: 00000000401c5820 RDI: 0000000000000009
RBP: 00007f12c0411e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f12c05d6038 R14: 00007f12c05d5fa0 R15: 00007fffb25ec4f8
 </TASK>
