rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (4 ticks this GP) idle=ea2/1/0x4000000000000000 softirq=28875/28875 fqs=5247 (detected by 1, t=10502 jiffies, g=50817, q=2031) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 167 Comm: kworker/u4:4 Not tainted 5.9.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy7 ieee80211_iface_work RIP: 0010:hlock_class kernel/locking/lockdep.c:179 [inline] RIP: 0010:__lock_acquire+0xb9a/0x5780 kernel/locking/lockdep.c:4438 Code: 20 66 81 e3 ff 1f 0f b7 db be 08 00 00 00 48 89 d8 48 c1 f8 06 48 8d 3c c5 e0 49 0c 8d e8 ee 42 5b 00 48 0f a3 1d e6 a2 b0 0b <0f> 83 23 0d 00 00 48 69 db b8 00 00 00 48 81 c3 00 4e 0c 8d 48 8d RSP: 0018:ffffc900000077e0 EFLAGS: 00000047 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff815ba6f2 RDX: fffffbfff1a1893d RSI: 0000000000000008 RDI: ffffffff8d0c49e0 RBP: ffff8880a896e0c0 R08: 0000000000000000 R09: ffffffff8d0c49e7 R10: fffffbfff1a1893c R11: 0000000000000000 R12: ffff8880a896ea48 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcc3ea2b000 CR3: 00000000a78ef000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1f3/0xaf0 kernel/locking/lockdep.c:5029 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x94/0xce kernel/locking/spinlock.c:159 debug_object_deactivate lib/debugobjects.c:710 [inline] debug_object_deactivate+0x101/0x300 lib/debugobjects.c:698 debug_hrtimer_deactivate kernel/time/hrtimer.c:425 [inline] debug_deactivate kernel/time/hrtimer.c:486 [inline] __run_hrtimer kernel/time/hrtimer.c:1492 [inline] __hrtimer_run_queues+0x3cb/0xfc0 kernel/time/hrtimer.c:1588 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1650 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x147/0x5f0 arch/x86/kernel/apic/apic.c:1097 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline] sysvec_apic_timer_interrupt+0x4c/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x4d/0x90 kernel/locking/spinlock.c:191 Code: 48 c7 c0 e8 6b fc 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 3c 48 83 3d 22 01 d3 01 00 74 29 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 d4 8a 27 f9 65 8b 05 9d 93 d8 77 RSP: 0018:ffffc90000007df0 EFLAGS: 00000286 RAX: 1ffffffff13f8d7d RBX: 0000000000000286 RCX: ffffffff815b7f72 RDX: dffffc0000000000 RSI: 0000000000000102 RDI: 0000000000000286 RBP: ffff8880ae427740 R08: 0000000000000001 R09: ffffffff8d0c4a3f R10: fffffbfff1a18947 R11: 0000000000000000 R12: ffff8880ae427740 R13: ffff8880ae4279c0 R14: ffff88805a744b78 R15: dffffc0000000000 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x5d1/0xfc0 kernel/time/hrtimer.c:1588 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1605 __do_softirq+0x1f8/0xb23 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x9b/0xd0 arch/x86/kernel/irq_64.c:77 do_softirq kernel/softirq.c:343 [inline] do_softirq+0x154/0x1b0 kernel/softirq.c:330 __local_bh_enable_ip+0x196/0x1f0 kernel/softirq.c:195 spin_unlock_bh include/linux/spinlock.h:399 [inline] cfg80211_bss_update+0x26b/0x1c60 net/wireless/scan.c:1292 cfg80211_inform_single_bss_frame_data+0x639/0xbe0 net/wireless/scan.c:1864 cfg80211_inform_bss_frame_data+0xa7/0xb10 net/wireless/scan.c:1897 ieee80211_bss_info_update+0x385/0xa80 net/mac80211/scan.c:189 ieee80211_rx_bss_info net/mac80211/ibss.c:1125 [inline] ieee80211_rx_mgmt_probe_beacon+0xc73/0x1670 net/mac80211/ibss.c:1614 ieee80211_ibss_rx_queued_mgmt+0xd6b/0x1640 net/mac80211/ibss.c:1641 ieee80211_iface_work+0x5ea/0x8f0 net/mac80211/iface.c:1417 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294