rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 13611 jiffies s: 7281 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6578 Comm: syz.3.167 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:native_apic_msr_write+0x39/0x50
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 e9 40 c8 5d 0a cc 89 f6 31 d2 e9 36 78 9b 03 66 0f 1f 44 00
RSP: 0018:ffffc90000a07ef0 EFLAGS: 00000046
RAX: 000000000000000f RBX: ffff88823c623c80 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 000000000000000f RDI: 0000000000000838
RBP: ffffc90000a07fc0 R08: ffffffff81b3f8d5 R09: 0000000000080000
R10: 0000000000000000 R11: ffffffff8174d530 R12: ffffffff8174d530
R13: 1ffff110478c4799 R14: 0000000000000000 R15: ffff88823c623ccc
FS:  00007f233f1d76c0(0000) GS:ffff8882a8f50000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f28e374dba8 CR3: 000000011e2da000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x44e/0x630
 __hrtimer_rearm_deferred+0x26c/0x420
 irqentry_exit+0x8b7/0x8f0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:cfg80211_update_known_bss+0xad4/0x1430
Code: 89 f8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 ce 06 00 00 66 41 89 1f 4d 8d bd c9 00 00 00 4c 89 f8 48 c1 e8 03 42 0f b6 04 20 <84> c0 0f 85 cc 06 00 00 41 0f b6 1f 4d 8d be c9 00 00 00 4c 89 f8
RSP: 0018:ffffc90000a08110 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffc90000a08403 RDI: ffff8881148f68c3
RBP: dffffc0000000000 R08: 0000000000000000 R09: 1ffff1102291ed18
R10: dffffc0000000000 R11: ffffed102291ed19 R12: dffffc0000000000
R13: ffffc90000a08340 R14: ffff8881148f6800 R15: ffffc90000a08409
 __cfg80211_bss_update+0x147/0x2010
 cfg80211_inform_single_bss_data+0xc4a/0x1be0
 cfg80211_inform_bss_data+0x25b/0x3d50
 cfg80211_inform_bss_frame_data+0x3c7/0x840
 ieee80211_bss_info_update+0x791/0xa50
 ieee80211_scan_rx+0x552/0xa40
 ieee80211_rx_list+0x2d0a/0x3b00
 ieee80211_rx_napi+0x1ad/0x3d0
 ieee80211_handle_queued_frames+0xe4/0x1d0
 tasklet_action_common+0x2d7/0x490
 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:free_frozen_page_commit+0x4d4/0x1230
Code: 41 0f b6 04 2a 84 c0 48 89 74 24 28 0f 85 da 07 00 00 44 89 27 45 85 e4 0f 84 57 06 00 00 84 c9 0f 85 57 06 00 00 89 4c 24 04 <49> 81 c5 f8 05 00 00 4c 89 ef be 08 00 00 00 e8 c8 91 0e 00 4c 89
RSP: 0018:ffffc900074ff690 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88823c6413c8 RCX: 0000000000000000
RDX: 000000000000003f RSI: ffff88823c6413c0 RDI: ffff88823c6413c4
RBP: dffffc0000000000 R08: ffff88823c6413d8 R09: 0000000000002269
R10: 1ffff110478c8278 R11: 000000000000db66 R12: 00000000000028ea
R13: ffff88823fff8140 R14: ffff88823c641380 R15: 00000000000007e0
 __free_frozen_pages+0x7d7/0xd10
 __mmdrop+0xf3/0x510
 finish_task_switch+0x698/0xc60
 __schedule+0x17e1/0x56c0
 preempt_schedule_common+0x82/0xd0
 preempt_schedule_thunk+0x16/0x40
 smp_call_function_single+0x46e/0x5a0
 perf_install_in_context+0x5bd/0x900
 __se_sys_perf_event_open+0x1906/0x1d40
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f233e39de99
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:00007f233f1d7028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f233e625fa0 RCX: 00007f233e39de99
RDX: feffffffffffffff RSI: 0000000000000000 RDI: 00002000000002c0
RBP: 00007f233e433eaf R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f233e626038 R14: 00007f233e625fa0 R15: 00007ffe6c0ecd28
 </TASK>
sched: DL replenish lagged too much
