rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=5974/1/0x4000000000000000 softirq=11618/11630 fqs=5080
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1259237          2            0
rcu: 	cputime:    34512      17966           35   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=9753 q=2007 ncpus=2)
CPU: 0 UID: 0 PID: 5996 Comm: syz.2.39 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:deref_stack_reg+0x1cf/0x230
Code: 24 18 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 23 6c b6 00 4c 89 33 b0 01 eb 02 31 c0 48 83 c4 20 5b 41 5c 41 5d <41> 5e 41 5f 5d c3 cc cc cc cc cc 44 89 f9 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc90000006e18 EFLAGS: 00000286
RAX: 1ffff92000000d01 RBX: ffffffff9123b498 RCX: 0000000000000001
RDX: ffffc90000006f48 RSI: dffffc0000000000 RDI: ffffc900000078f8
RBP: 1ffff92000000de1 R08: ffffc900000078f8 R09: 0000000000000000
R10: ffffc90000006f58 R11: fffff52000000ded R12: ffffc90000006f58
R13: 1ffff92000000de3 R14: 0000000000000002 R15: dffffc0000000000
FS:  00007f486f11a6c0(0000) GS:ffff88818e0a4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055975ce1d680 CR3: 000000010f884000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0x18c6/0x23c0
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x35c/0x760
 cfg80211_inform_single_bss_data+0x952/0x1b70
 cfg80211_inform_bss_data+0x24d/0x3be0
 cfg80211_inform_bss_frame_data+0x3c7/0x760
 ieee80211_bss_info_update+0x794/0xa40
 ieee80211_scan_rx+0x552/0xa40
 ieee80211_rx_list+0x29e5/0x3710
 ieee80211_rx_napi+0x1b1/0x3e0
 ieee80211_handle_queued_frames+0xe8/0x1e0
 tasklet_action_common+0x2da/0x4b0
 handle_softirqs+0x22a/0x870
 __irq_exit_rcu+0x5f/0x150
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80
Code: f7 e8 9d 37 10 f6 f7 c3 00 02 00 00 74 05 e8 10 ba 3a f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 74 28 02 f6 65 8b 05 3d e4 66 07 85 c0 74 18 5b 41 5e c3 cc cc
RSP: 0018:ffffc90005d1ec90 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000282 RCX: 0000000000000001
RDX: 0000000000000007 RSI: ffffffff8dcf1f4e RDI: 0000000000000001
RBP: dffffc0000000000 R08: ffffffff8ff0e0b7 R09: 1ffffffff1fe1c16
R10: dffffc0000000000 R11: fffffbfff1fe1c17 R12: 1ffff11021e807d0
R13: ffffc90005d18000 R14: ffffffff8e566480 R15: dffffc0000000000
 __rcu_read_unlock+0x83/0xe0
 unwind_next_frame+0x1aaf/0x23c0
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 save_stack+0x122/0x230
 __reset_page_owner+0x71/0x1f0
 __free_frozen_pages+0xbb9/0xd10
 __slab_free+0x263/0x2b0
 qlist_free_all+0x97/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x2bc/0x650
 ptlock_alloc+0x20/0x70
 pte_alloc_one+0x7a/0x370
 __pte_alloc+0x25/0x1a0
 copy_pmd_range+0x76d2/0x7e80
 copy_page_range+0xbe8/0x11f0
 dup_mmap+0xf40/0x1d90
 copy_mm+0x13b/0x4b0
 copy_process+0x18b5/0x3cf0
 kernel_clone+0x248/0x8e0
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f486e19acb9
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:00007f486f119fd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f486e415fa0 RCX: 00007f486e19acb9
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000000
RBP: 00007f486e208bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f486e416038 R14: 00007f486e415fa0 R15: 00007ffd253156a8
 </TASK>
sched: DL replenish lagged too much
