rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10500 ticks this GP) idle=0b6/1/0x4000000000000000 softirq=21932/21936 fqs=1874 (t=10502 jiffies g=30129 q=1118) NMI backtrace for cpu 0 CPU: 0 PID: 13873 Comm: syz-executor.4 Not tainted 5.12.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xfa/0x151 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x222/0x2a7 kernel/rcu/tree_stall.h:341 print_cpu_stall kernel/rcu/tree_stall.h:622 [inline] check_cpu_stall kernel/rcu/tree_stall.h:697 [inline] rcu_pending kernel/rcu/tree.c:3830 [inline] rcu_sched_clock_irq.cold+0x4f7/0x11dd kernel/rcu/tree.c:2650 update_process_times+0x16d/0x200 kernel/time/timer.c:1796 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:__local_bh_enable_ip+0x19/0x120 kernel/softirq.c:178 Code: 00 eb b6 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 48 89 fd 53 89 f3 65 8b 05 e2 19 bd 7e a9 00 00 0f 00 0f 85 b6 00 00 00 <48> c7 c0 8c 5e c6 8d 48 ba 00 00 00 00 00 fc ff df 48 89 c1 83 e0 RSP: 0018:ffffc900000078e8 EFLAGS: 00000246 RAX: 0000000000000303 RBX: 0000000000000201 RCX: ffffffff8159e020 RDX: dffffc0000000000 RSI: 0000000000000201 RDI: ffffffff885f573c RBP: ffffffff885f573c R08: 0000000000000000 R09: ffff88806fac956b R10: ffffed100df592ad R11: 0000000000000003 R12: dffffc0000000000 R13: ffffc90000007bc8 R14: ffff88808069c050 R15: 0000000000000003 spin_unlock_bh include/linux/spinlock.h:399 [inline] ieee80211_rx_handlers+0x10fc/0xae60 net/mac80211/rx.c:3801 ieee80211_invoke_rx_handlers net/mac80211/rx.c:3823 [inline] ieee80211_prepare_and_rx_handle+0x22ad/0x5070 net/mac80211/rx.c:4537 __ieee80211_rx_handle_packet net/mac80211/rx.c:4635 [inline] ieee80211_rx_list+0x930/0x2680 net/mac80211/rx.c:4819 ieee80211_rx_napi+0xf7/0x3d0 net/mac80211/rx.c:4842 ieee80211_rx include/net/mac80211.h:4524 [inline] ieee80211_tasklet_handler+0xd4/0x130 net/mac80211/main.c:235 tasklet_action_common.constprop.0+0x1d7/0x2d0 kernel/softirq.c:557 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345 invoke_softirq kernel/softirq.c:221 [inline] __irq_exit_rcu kernel/softirq.c:422 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:434 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x2e/0x50 kernel/locking/spinlock.c:191 Code: 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 9a de 53 f8 48 89 ef e8 12 94 54 f8 80 e7 02 74 06 e8 68 f5 73 f8 fb bf 01 00 00 00 8d 8f 48 f8 65 8b 05 e6 a3 fc 76 85 c0 74 03 5b 5d c3 e8 41 f9 RSP: 0018:ffffc9000c7271a0 EFLAGS: 00000206 RAX: 0000000000d6f57b RBX: 0000000000000212 RCX: 1ffffffff1b8be61 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001 RBP: ffffffff900ccc30 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff81794168 R11: 0000000000000000 R12: ffff888013bbb000 R13: 1ffff920018e4e46 R14: ffffffff900ccc30 R15: ffffffff900ccc28 __debug_object_init+0x409/0xd10 lib/debugobjects.c:600 debug_object_init lib/debugobjects.c:615 [inline] debug_object_activate+0x32c/0x3e0 lib/debugobjects.c:701 debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline] __call_rcu kernel/rcu/tree.c:3023 [inline] call_rcu+0x2c/0x700 kernel/rcu/tree.c:3114 put_task_struct_rcu_user+0x7f/0xb0 kernel/exit.c:179 context_switch kernel/sched/core.c:4327 [inline] __schedule+0x914/0x21a0 kernel/sched/core.c:5075 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:5532 irqentry_exit_cond_resched kernel/entry/common.c:392 [inline] irqentry_exit_cond_resched kernel/entry/common.c:384 [inline] irqentry_exit+0x7a/0xa0 kernel/entry/common.c:428 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:page_memcg include/linux/memcontrol.h:378 [inline] RIP: 0010:page_expected_state mm/page_alloc.c:1103 [inline] RIP: 0010:check_free_page mm/page_alloc.c:1145 [inline] RIP: 0010:free_pages_prepare mm/page_alloc.c:1253 [inline] RIP: 0010:__free_pages_ok+0x6aa/0xe90 mm/page_alloc.c:1536 Code: e8 6b 4d 09 00 4c 89 e0 48 c1 e8 03 42 0f b6 14 38 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 9d 06 00 00 41 8b 45 34 <48> 8d 7b 30 89 44 24 1c 48 89 f8 48 c1 e8 03 42 80 3c 38 00 0f 85 RSP: 0018:ffffc9000c7275c0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffea0001ea9e48 RCX: ffffffff81ae0035 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffea0001ea9e74 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffea0001ea9e77 R10: fffff940003d53ce R11: 0000000000000003 R12: ffffea0001ea9e74 R13: ffffea0001ea9e40 R14: 0000000000000079 R15: dffffc0000000000 release_pages+0x813/0x2320 mm/swap.c:899 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:242 [inline] tlb_flush_mmu+0xe9/0x6b0 mm/mmu_gather.c:249 zap_pte_range mm/memory.c:1342 [inline] zap_pmd_range mm/memory.c:1380 [inline] zap_pud_range mm/memory.c:1409 [inline] zap_p4d_range mm/memory.c:1430 [inline] unmap_page_range+0x1a7f/0x2650 mm/memory.c:1451 unmap_single_vma+0x198/0x300 mm/memory.c:1496 unmap_vmas+0x16d/0x2f0 mm/memory.c:1528 exit_mmap+0x2a8/0x590 mm/mmap.c:3218 __mmput+0x122/0x470 kernel/fork.c:1082 mmput+0x58/0x60 kernel/fork.c:1103 exit_mm kernel/exit.c:501 [inline] do_exit+0xb0a/0x2a60 kernel/exit.c:812 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x42c/0x2100 kernel/signal.c:2773 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ef9 Code: Unable to access opcode bytes at RIP 0x465ecf. RSP: 002b:00007fa8c31ca218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000056bf68 RCX: 0000000000465ef9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf68 RBP: 000000000056bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf6c R13: 00007ffcbbb1c66f R14: 00007fa8c31ca300 R15: 0000000000022000