rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10428 ticks this GP) idle=458c/1/0x4000000000000000 softirq=20326/20329 fqs=4833
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   959629          6            0
rcu: 	cputime:    34362      18117           57   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=14153 q=3659 ncpus=2)
CPU: 0 UID: 0 PID: 7200 Comm: syz.0.417 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+0x1315/0x2390
Code: 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 27 49 63 07 <4c> 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 49 8d 47 fc 48 0f 47 d8
RSP: 0018:ffffc90000006b98 EFLAGS: 00000246
RAX: fffffffff2728d27 RBX: ffffffff8fc12dc4 RCX: dffffc0000000000
RDX: ffffffff8fc12dbc RSI: ffffffff9042068c RDI: ffffffff8be33ba0
RBP: ffffffff8fc12dbc R08: 0000000000000003 R09: ffffffff8172d195
R10: ffffc90000006cb8 R11: ffffffff81ac4b00 R12: ffffffff8233ba14
R13: ffffffff8fc12dbc R14: ffffc90000006c68 R15: ffffffff8fc12dc0
FS:  00007f8582df66c0(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000200 CR3: 0000000033c30000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000602
Call Trace:
 <IRQ>
 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:finish_task_switch+0x31a/0x950
Code: be 04 00 00 00 e8 a6 0c 92 00 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 e3 02 00 00 f7 03 20 00 00 00 0f 85 c8 01 00 00 <f3> 0f 1e fa 4c 89 ff be 04 00 00 00 e8 a5 0c 92 00 f0 41 ff 0f 0f
RSP: 0018:ffffc9000457f158 EFLAGS: 00000202
RAX: 1ffff110047817db RBX: ffff888023c0cff8 RCX: 38abe7621ea0a200
RDX: 0000000000000007 RSI: ffffffff8d9b9cae RDI: ffff888023c0cf98
RBP: ffffc9000457f1b0 R08: ffffffff8fa3a637 R09: 1ffffffff1f474c6
R10: dffffc0000000000 R11: fffffbfff1f474c7 R12: ffff888023c0bed8
R13: dffffc0000000000 R14: ffffffff8de95100 R15: ffff88802351cb40
 __schedule+0x17a0/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x175/0x360
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 7b 41 03 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000457f540 EFLAGS: 00000206
RAX: 38abe7621ea0a200 RBX: 0000000000000000 RCX: 38abe7621ea0a200
RDX: 0000000000000001 RSI: ffffffff8dba91a8 RDI: ffffffff8be33c00
RBP: ffffffff8208cb02 R08: 0000000000000000 R09: ffffffff8208cb02
R10: dffffc0000000000 R11: ffffed1004b21da0 R12: 0000000000000001
R13: ffff88802590ed60 R14: 0000000000000001 R15: 0000000000000246
 down_read_trylock+0x20a/0x380
 lock_mm_and_find_vma+0x32/0x300
 do_user_addr_fault+0x331/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:rep_movs_alternative+0x75/0x90
Code: 05 c3 cc cc cc cc 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 c7 48 01 c6 48 29 c1 48 89 c8 48 c1 e9 03 83 e0 07 <f3> 48 a5 89 c1 85 c9 75 91 c3 cc cc cc cc 48 8d 0c c8 eb 86 cc cc
RSP: 0018:ffffc9000457f878 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888128480000 RCX: 0000000000000dfc
RDX: 0000000000000001 RSI: 000020000002d000 RDI: ffff8881284ad000
RBP: ffffc9000457f9f0 R08: ffff8881284b3fdf R09: 1ffff110250967fb
R10: dffffc0000000000 R11: ffffed10250967fc R12: 1ffff920008aff77
R13: 0000200000000000 R14: ffffc9000457fbc8 R15: 0000000000033fe0
 _copy_from_iter+0x24f/0x1790
 netlink_sendmsg+0x6b2/0xb30
 __sock_sendmsg+0x21c/0x270
 sock_write_iter+0x258/0x330
 vfs_write+0x5c9/0xb30
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8584b8ec29
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:00007f8582df6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8584dd5fa0 RCX: 00007f8584b8ec29
RDX: 0000000000033fe0 RSI: 0000200000000000 RDI: 0000000000000009
RBP: 00007f8584c11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8584dd6038 R14: 00007f8584dd5fa0 R15: 00007fff5698a598
 </TASK>
sched: DL replenish lagged too much
