rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=26e/1/0x4000000000000004 softirq=82940/82959 fqs=76 (t=10502 jiffies g=84961 q=1947) NMI backtrace for cpu 0 CPU: 0 PID: 30351 Comm: syz-executor.4 Not tainted 5.6.0-rc5-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+0x1e9/0x30e lib/dump_stack.c:118 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x169/0x250 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline] check_cpu_stall kernel/rcu/tree_stall.h:549 [inline] rcu_pending kernel/rcu/tree.c:3030 [inline] rcu_sched_clock_irq+0x171f/0x1970 kernel/rcu/tree.c:2276 update_process_times+0x12c/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:171 [inline] tick_sched_timer+0x254/0x410 kernel/time/tick-sched.c:1314 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x3cf/0x7d0 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x373/0xd60 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1144 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline] RIP: 0010:lock_acquire+0x1b0/0x250 kernel/locking/lockdep.c:4487 Code: e8 03 42 80 3c 28 00 74 0c 48 c7 c7 58 d4 0a 89 e8 c5 fc 56 00 48 83 3d c5 e5 b0 07 00 0f 84 9d 00 00 00 48 8b 7c 24 10 57 9d <0f> 1f 44 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 44 89 RSP: 0018:ffffc90000007ce8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1215a8b RBX: ffffc90000007d58 RCX: ffffffff815ac405 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000282 RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff15dbb42 R10: fffffbfff15dbb42 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000 call_timer_fn+0x7c/0x160 kernel/time/timer.c:1401 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0x776/0x970 kernel/time/timer.c:1773 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1786 __do_softirq+0x268/0x7c5 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x223/0x230 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1146 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:pmd_val arch/x86/include/asm/paravirt.h:487 [inline] RIP: 0010:pmd_page_vaddr arch/x86/include/asm/pgtable.h:797 [inline] RIP: 0010:pte_offset_kernel arch/x86/include/asm/pgtable.h:839 [inline] RIP: 0010:zap_pte_range+0x297/0x1c00 mm/memory.c:1038 Code: 28 48 89 d8 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df 42 80 3c 28 00 74 08 48 89 df e8 82 32 0e 00 48 8b 0b 4c 89 f7 48 89 f8 <0f> 1f 40 00 49 89 c7 48 89 8c 24 98 00 00 00 48 89 cf e8 52 a4 57 RSP: 0018:ffffc900018df7c0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000092eef067 RBX: ffffea00024bbbe8 RCX: ffff8880a89084d0 RDX: ffff8880915904c0 RSI: 0000000000000067 RDI: 0000000092eef067 RBP: ffffc900018df900 R08: ffffffff81a2b87a R09: ffffc900018df8b0 R10: fffff5200031bf18 R11: 0000000000000000 R12: 000ffffffffff000 R13: dffffc0000000000 R14: 0000000092eef067 R15: 0000000092eef067 zap_pmd_range mm/memory.c:1184 [inline] zap_pud_range mm/memory.c:1213 [inline] zap_p4d_range mm/memory.c:1234 [inline] unmap_page_range+0x9a0/0xb00 mm/memory.c:1255 unmap_vmas+0x15d/0x2c0 mm/memory.c:1332 exit_mmap+0x276/0x530 mm/mmap.c:3126 __mmput+0x113/0x350 kernel/fork.c:1082 exit_mm+0x4cd/0x550 kernel/exit.c:485 do_exit+0x56e/0x1f80 kernel/exit.c:788 do_group_exit+0x15e/0x2c0 kernel/exit.c:899 get_signal+0x13cf/0x1d60 kernel/signal.c:2739 do_signal+0x33/0x610 arch/x86/kernel/signal.c:813 exit_to_usermode_loop arch/x86/entry/common.c:160 [inline] prepare_exit_to_usermode+0x32a/0x600 arch/x86/entry/common.c:195 ret_from_intr+0x26/0x36 RIP: 0033:0x4034a5 Code: 0f 10 08 48 8b 44 24 10 f3 0f 10 50 04 f3 0f 10 18 0f 2e cb 0f 94 c1 0f 9b c0 21 c1 0f 2e c2 0f 94 c2 0f 9b c0 21 c2 21 d1 88 <4c> 24 18 c3 cc cc cc cc cc cc cc 48 8b 44 24 08 f2 0f 10 40 08 f2 RSP: 002b:00007f55346bcc60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000045f68a RDX: 00000000000105fb RSI: 00007f55346bcc60 RDI: 0000000000000001 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000000000c5 R14: 00000000004c351f R15: 000000000076bf0c