rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (9885 ticks this GP) idle=366/1/0x4000000000000000 softirq=20889/20891 fqs=4826 (t=10502 jiffies g=25081 q=803) NMI backtrace for cpu 1 CPU: 1 PID: 13167 Comm: syz-executor.4 Not tainted 5.10.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 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+0x1e3/0x21e kernel/rcu/tree_stall.h:331 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline] check_cpu_stall kernel/rcu/tree_stall.h:637 [inline] rcu_pending kernel/rcu/tree.c:3694 [inline] rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567 update_process_times+0x77/0xd0 kernel/time/timer.c:1709 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 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+0x48/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:ieee80211_rx_get_bigtk+0x2/0x4b0 net/mac80211/rx.c:1862 Code: a4 64 f9 e9 c8 f6 ff ff e8 fb a3 64 f9 e9 98 f6 ff ff e8 f1 a3 64 f9 e9 64 f6 ff ff e8 e7 a3 64 f9 e9 34 f6 ff ff cc cc 41 57 <41> 56 41 55 41 54 55 48 89 fd 53 48 63 de 48 83 ec 08 e8 47 25 23 RSP: 0018:ffffc90000d90900 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff884db7bb RDX: ffff888017074ec0 RSI: 00000000ffffffff RDI: ffffc90000d90d48 RBP: ffff888072c92488 R08: 0000000000000001 R09: 0000000000000003 R10: 0000000000000080 R11: 0000000000000001 R12: dffffc0000000000 R13: ffff888072c923c0 R14: 0000000000000001 R15: 00000000ffffffff ieee80211_rx_h_decrypt net/mac80211/rx.c:2018 [inline] ieee80211_rx_handlers+0x32c8/0xae50 net/mac80211/rx.c:3782 ieee80211_invoke_rx_handlers net/mac80211/rx.c:3834 [inline] ieee80211_prepare_and_rx_handle+0x2482/0x6360 net/mac80211/rx.c:4518 __ieee80211_rx_handle_packet net/mac80211/rx.c:4579 [inline] ieee80211_rx_list+0xdf3/0x23d0 net/mac80211/rx.c:4759 ieee80211_rx_napi+0xf7/0x3d0 net/mac80211/rx.c:4780 ieee80211_rx include/net/mac80211.h:4502 [inline] ieee80211_tasklet_handler+0xd3/0x130 net/mac80211/main.c:235 tasklet_action_common.constprop.0+0x22f/0x2d0 kernel/softirq.c:560 __do_softirq+0x2a0/0x9f6 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+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x132/0x200 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:call_rcu+0x2e7/0x700 kernel/rcu/tree.c:3028 Code: 3c 02 00 0f 85 bb 03 00 00 48 8b 05 53 98 d6 09 49 03 84 24 f0 00 00 00 49 39 c7 0f 8f 65 01 00 00 e8 0d 63 18 00 ff 34 24 9d <48> 83 c4 20 5b 5d 41 5c 41 5d 41 5e 41 5f c3 80 3c 02 00 0f 84 2f RSP: 0018:ffffc9000be3f2f8 EFLAGS: 00000246 RAX: 0000000002369c97 RBX: ffff888061df2e08 RCX: 1ffffffff19d8de9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff8880b9f35830 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880b9f35740 R13: ffff8880b9f35820 R14: ffff8880b9f357d8 R15: 0000000000000024 put_task_struct_rcu_user+0x7f/0xb0 kernel/exit.c:178 finish_task_switch+0x548/0x7a0 kernel/sched/core.c:3652 context_switch kernel/sched/core.c:3782 [inline] __schedule+0x89b/0x2130 kernel/sched/core.c:4528 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:4789 irqentry_exit_cond_resched kernel/entry/common.c:357 [inline] irqentry_exit_cond_resched kernel/entry/common.c:349 [inline] irqentry_exit+0x7a/0xa0 kernel/entry/common.c:387 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:999 [inline] RIP: 0010:debug_check_no_obj_freed+0x213/0x420 lib/debugobjects.c:1018 Code: f6 fd 4c 8b 44 24 38 e9 17 ff ff ff 44 01 64 24 0c 45 89 e5 48 8b 74 24 28 48 8b 7c 24 10 e8 b4 45 2d 05 44 39 2d 25 57 32 09 <7d> 07 44 89 2d 1c 57 32 09 48 81 44 24 18 00 10 00 00 48 8b 44 24 RSP: 0018:ffffc9000be3f568 EFLAGS: 00000202 RAX: 0000000080000000 RBX: ffff888063600000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: 1ffffffff1e1911c R13: 0000000000000000 R14: dead000000000100 R15: dffffc0000000000 free_pages_prepare mm/page_alloc.c:1261 [inline] __free_pages_ok+0x241/0xc90 mm/page_alloc.c:1519 release_pages+0x53e/0x1690 mm/swap.c:922 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:1319 [inline] zap_pmd_range mm/memory.c:1357 [inline] zap_pud_range mm/memory.c:1386 [inline] zap_p4d_range mm/memory.c:1407 [inline] unmap_page_range+0x1a75/0x2640 mm/memory.c:1428 unmap_single_vma+0x198/0x300 mm/memory.c:1473 unmap_vmas+0x168/0x2e0 mm/memory.c:1505 exit_mmap+0x2b1/0x530 mm/mmap.c:3222 __mmput+0x122/0x470 kernel/fork.c:1079 mmput+0x53/0x60 kernel/fork.c:1100 exit_mm kernel/exit.c:486 [inline] do_exit+0xa72/0x29b0 kernel/exit.c:796 do_group_exit+0x125/0x310 kernel/exit.c:906 get_signal+0x42a/0x1f10 kernel/signal.c:2758 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45deb9 Code: Unable to access opcode bytes at RIP 0x45de8f. RSP: 002b:00007f7c7f17ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: 0000000000000004 RBX: 00000000000225c0 RCX: 000000000045deb9 RDX: 0000000000000000 RSI: 0000000020000400 RDI: 00000000ffffff9c RBP: 000000000118c208 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118c1cc R13: 00007fff1259ebdf R14: 00007f7c7f17f9c0 R15: 000000000118c1cc