rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10371 ticks this GP) idle=aee/1/0x4000000000000000 softirq=14823/14826 fqs=5177 (t=10500 jiffies g=13697 q=283) NMI backtrace for cpu 1 CPU: 1 PID: 10957 Comm: syz-executor.3 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_irqrestore include/linux/spinlock_api_smp.h:161 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x25/0x50 kernel/locking/spinlock.c:191 Code: f8 5d c3 66 90 55 48 89 fd 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 ca 3a 6e f8 48 89 ef e8 52 ef 6e f8 f6 c7 02 75 1a 53 9d 01 00 00 00 e8 61 5b 63 f8 65 8b 05 8a 05 1a 77 85 c0 74 0a 5b RSP: 0018:ffffc90000d90e10 EFLAGS: 00000286 RAX: 000000000229c09c RBX: 0000000000000286 RCX: 1ffffffff19d8e91 RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000000 RBP: ffff8880b9f26900 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880b9f26900 R13: ffff8880b9f26b80 R14: ffffffff850f3110 R15: dffffc0000000000 __run_hrtimer kernel/time/hrtimer.c:1515 [inline] __hrtimer_run_queues+0x5c0/0xea0 kernel/time/hrtimer.c:1583 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1600 __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:schedule_debug kernel/sched/core.c:4278 [inline] RIP: 0010:__schedule+0x139/0x2130 kernel/sched/core.c:4423 Code: 7d 1a 00 00 48 ba 00 00 00 00 00 fc ff df 49 8b 45 18 48 89 c1 48 c1 e9 03 80 3c 11 00 0f 85 43 1a 00 00 48 81 38 9d 6e ac 57 <0f> 85 c5 1f 00 00 49 8d 45 10 84 db 48 89 85 68 ff ff ff 75 28 48 RSP: 0018:ffffc900026ff450 EFLAGS: 00000246 RAX: ffffc900026f8000 RBX: 0000000000000001 RCX: 1ffff920004df000 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff88801106ced8 RBP: ffffc900026ff518 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880b9f34940 R13: ffff88801106cec0 R14: ffff8880b9f34940 R15: 0000000000034940 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:section_to_usemap include/linux/mmzone.h:1261 [inline] RIP: 0010:get_pageblock_bitmap mm/page_alloc.c:482 [inline] RIP: 0010:__get_pfnblock_flags_mask mm/page_alloc.c:515 [inline] RIP: 0010:get_pfnblock_migratetype mm/page_alloc.c:532 [inline] RIP: 0010:free_unref_page_prepare mm/page_alloc.c:3160 [inline] RIP: 0010:free_unref_page_prepare mm/page_alloc.c:3153 [inline] RIP: 0010:free_unref_page_list+0xe3/0x750 mm/page_alloc.c:3227 Code: 31 00 0f 85 14 05 00 00 4d 8b 3f 4d 85 ff 74 0a 0f b6 c0 48 c1 e0 04 49 01 c7 49 8d 7f 08 48 89 f8 48 c1 e8 03 42 80 3c 30 00 <0f> 85 e2 04 00 00 48 89 e8 49 8b 77 08 48 c1 e8 09 83 e0 3f c1 e0 RSP: 0018:ffffc900026ff5f8 EFLAGS: 00000246 RAX: 1ffff11027fff40d RBX: ffffea0000da6bc0 RCX: 1ffff11047ffe800 RDX: 0000000000000000 RSI: fffffbfff1dea7a4 RDI: ffff88813fffa068 RBP: 00000000000369af R08: ffffed1006d35e00 R09: ffffed1006d35e00 R10: 0000000000000000 R11: 0000000000000000 R12: ffffea0000c5a380 R13: ffffc900026ff6d0 R14: dffffc0000000000 R15: ffff88813fffa060 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: 0033:0x45e159 Code: Unable to access opcode bytes at RIP 0x45e12f. RSP: 002b:00007fdd238d5c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: 0000000000278000 RBX: 0000000000000006 RCX: 000000000045e159 RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000005 RBP: 000000000119bfd8 R08: 0000000000000000 R09: 0000000000000053 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffd8d2a90af R14: 00007fdd238d69c0 R15: 000000000119bf8c