rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10496 ticks this GP) idle=ca6c/1/0x4000000000000000 softirq=57818/57819 fqs=4927
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1074171          0            0
rcu: 	cputime:    30811      21678           42   ==> 52500(ms)
rcu: 	(t=10501 jiffies g=51949 q=3007 ncpus=2)
CPU: 1 UID: 0 PID: 15305 Comm: syz.7.2526 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:lock_acquire+0x4/0x340
Code: 10 a9 00 ff ff 00 0f 95 c0 e9 d8 35 c0 09 cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <55> 41 57 41 56 41 55 41 54 53 48 83 ec 60 4d 89 ce 45 89 c7 41 89
RSP: 0018:ffffc90000a07ca8 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffffffff8ad6d0e5 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8df41a20
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90000a07dd8 R11: ffffffff81ada120 R12: 1ffff92000140fb1
R13: ffffc90000a07dc0 R14: ffffc90000a07d88 R15: ffffffff81743f85
FS:  00007f25f60c16c0(0000) GS:ffff8882a9e35000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c306886 CR3: 0000000112cb2000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0xc2/0x23d0
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x41d/0x800
 cfg80211_inform_single_bss_data+0x91e/0x1ad0
 cfg80211_inform_bss_data+0x203/0x3b40
 cfg80211_inform_bss_frame_data+0x3c7/0x710
 ieee80211_bss_info_update+0x749/0x9e0
 ieee80211_scan_rx+0x593/0xa20
 ieee80211_rx_list+0x2485/0x2f90
 ieee80211_rx_napi+0x1a8/0x3d0
 ieee80211_handle_queued_frames+0xe8/0x1e0
 tasklet_action_common+0x358/0x550
 handle_softirqs+0x27d/0x850
 __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+0x319/0x940
Code: 00 00 f3 0f 1e fa 4c 89 ff be 04 00 00 00 e8 5e 07 96 00 f0 41 ff 0f 0f 84 37 01 00 00 81 7d a8 80 00 00 00 0f 84 3f 01 00 00 <48> 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d
RSP: 0018:ffffc90008fa7038 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffff888112ad33e8 RCX: 4ad32c618fcd2f00
RDX: 0000000000000006 RSI: ffffffff8d792409 RDI: ffff888112ad3388
RBP: ffffc90008fa7090 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee
R10: dffffc0000000000 R11: fffffbfff1f043ef R12: ffff888112ad1d40
R13: dffffc0000000000 R14: ffff88816d370000 R15: 0000000000000000
 __schedule+0x14c4/0x5000
 preempt_schedule_common+0x83/0xd0
 preempt_schedule+0xae/0xc0
 preempt_schedule_thunk+0x16/0x30
 _raw_spin_unlock+0x3f/0x50
 copy_pmd_range+0x74f2/0x7e00
 copy_page_range+0xb88/0x11d0
 dup_mmap+0xf4a/0x1b80
 copy_mm+0x13c/0x4b0
 copy_process+0x165d/0x3950
 kernel_clone+0x21e/0x820
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f25f518f7c9
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:00007f25f60c0fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f25f53e5fa0 RCX: 00007f25f518f7c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000011
RBP: 00007f25f51f297f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f25f53e6038 R14: 00007f25f53e5fa0 R15: 00007ffe898e0358
 </TASK>
sched: DL replenish lagged too much
