rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (507 ticks this GP) idle=0e2/1/0x4000000000000000 softirq=21621/21621 fqs=5243 (t=10502 jiffies g=28437 q=374) NMI backtrace for cpu 0 CPU: 0 PID: 13741 Comm: syz-executor.0 Not tainted 5.10.0-rc7-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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:199 Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 3e 29 6e f8 48 89 ef e8 c6 dd 6e f8 e8 81 c7 8d f8 fb bf 01 00 00 00 d6 49 63 f8 65 8b 05 ff f3 19 77 85 c0 74 02 5d c3 e8 9b 49 18 RSP: 0018:ffffc90000007e18 EFLAGS: 00000202 RAX: 0000000001538558 RBX: ffffffff87a44e10 RCX: 1ffffffff19d8e91 RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000001 RBP: ffff8880b9e24780 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffffc90000007eb0 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880b9e24780 expire_timers kernel/time/timer.c:1454 [inline] __run_timers.part.0+0x66c/0xa50 kernel/time/timer.c:1747 __run_timers kernel/time/timer.c:1728 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1760 __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:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:4789 Code: 55 53 65 48 8b 1c 25 00 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 82 3a 64 f8 e8 ad a0 8e f8 fb bf 01 00 00 00 82 d1 ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 f0 22 64 RSP: 0018:ffffc90017b6f4f8 EFLAGS: 00000206 RAX: 000000000039c90f RBX: ffff88801a931a40 RCX: 1ffffffff19d8e91 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffffed1003526348 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 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:kernel_poison_pages+0x2/0x290 mm/page_poison.c:129 Code: 1f 44 00 00 e8 2f 54 bf ff e8 2a 54 bf ff 45 31 e4 44 89 e0 41 5c c3 e8 1c 54 bf ff 41 bc 01 00 00 00 44 89 e0 41 5c c3 41 57 <41> 56 41 55 41 54 49 89 fc 55 89 d5 53 89 f3 48 83 ec 10 e8 f6 53 RSP: 0018:ffffc90017b6f5c0 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffea0001b412c0 RBP: ffffea0001b412c0 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88806d04b000 R13: ffffea0001b412f4 R14: dffffc0000000000 R15: ffffea0001b412c8 free_pages_prepare mm/page_alloc.c:1267 [inline] free_pcp_prepare+0x207/0x2f0 mm/page_alloc.c:1291 free_unref_page_prepare mm/page_alloc.c:3157 [inline] free_unref_page_list+0x19b/0x750 mm/page_alloc.c:3227 release_pages+0x59b/0x1690 mm/swap.c:952 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:3220 __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: 0033:0x460fba Code: Unable to access opcode bytes at RIP 0x460f90. RSP: 002b:00007f224ff85c48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4 RAX: 0000000000000000 RBX: 00000000004c4dec RCX: 0000000000460fba RDX: 00000000004e1b80 RSI: 00007f224ff85c50 RDI: 0000000000000001 RBP: 000000000119bf80 R08: 0000000000000011 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffcb7a4eb3f R14: 00007f224ff869c0 R15: 000000000119bf8c