rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10498 ticks this GP) idle=10e/1/0x4000000000000004 softirq=135349/135349 fqs=5155 (t=10500 jiffies g=178741 q=703) NMI backtrace for cpu 1 CPU: 1 PID: 18563 Comm: syz-executor.3 Not tainted 5.5.0-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+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaa/0x190 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16f/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq+0x1521/0x1ab0 kernel/rcu/tree.c:2271 update_process_times+0x12d/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:171 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1314 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x3f3/0x840 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x37c/0xda0 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x5a/0x80 kernel/locking/spinlock.c:199 Code: 00 00 00 00 fc ff df 80 3c 08 00 74 0c 48 c7 c7 38 91 0a 89 e8 77 b1 b5 f9 48 83 3d 37 81 0d 01 00 74 26 fb 66 0f 1f 44 00 00 01 00 00 00 e8 fc d2 55 f9 65 8b 05 b1 0d 05 78 85 c0 74 03 5b RSP: 0018:ffffc90000da8d98 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1215227 RBX: ffff8880aed27080 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888042b08e44 RBP: ffffc90000da8da0 R08: ffff888042b08e58 R09: fffffbfff13cd11f R10: fffffbfff13cd11f R11: 0000000000000000 R12: dffffc0000000000 R13: ffff8880a9030410 R14: ffff8880a9030418 R15: ffffffff866c3600 expire_timers kernel/time/timer.c:1448 [inline] __run_timers+0x766/0x970 kernel/time/timer.c:1773 run_timer_softirq+0x4a/0x90 kernel/time/timer.c:1786 __do_softirq+0x283/0x7bd arch/x86/include/asm/paravirt.h:762 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x227/0x230 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:__read_once_size include/linux/compiler.h:199 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:155 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x20/0x50 kernel/kcov.c:187 Code: de e8 a4 cf 3b 00 5b 5d c3 cc 55 48 89 e5 48 8b 45 08 65 48 8b 0c 25 c0 1d 02 00 65 8b 15 34 a0 8b 7e f7 c2 00 01 1f 00 75 2c <8b> 91 80 13 00 00 83 fa 02 75 21 48 8b 91 88 13 00 00 48 8b 32 48 RSP: 0018:ffffc900017c7650 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81a462ea RBX: 0000000000000000 RCX: ffff888042b08600 RDX: 0000000080000001 RSI: 000000000021ffff RDI: 000000000008dedd RBP: ffffc900017c7650 R08: ffffffff81a30d53 R09: ffffed10085610c1 R10: ffffed10085610c1 R11: 0000000000000000 R12: 1ffff110054f7c21 R13: 000000008dedd025 R14: dffffc0000000000 R15: 0000000000421000 zap_pte_range+0x46a/0x1c20 mm/memory.c:1054 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+0x9b5/0xaf0 mm/memory.c:1255 unmap_single_vma+0x1d4/0x2e0 mm/memory.c:1300 unmap_vmas+0x15e/0x2b0 mm/memory.c:1332 exit_mmap+0x281/0x540 mm/mmap.c:3134 __mmput+0x120/0x3a0 kernel/fork.c:1082 mmput+0x5d/0x70 kernel/fork.c:1103 exit_mm+0x4f4/0x580 kernel/exit.c:485 do_exit+0x572/0x2000 kernel/exit.c:788 do_group_exit+0x15c/0x2b0 kernel/exit.c:899 get_signal+0x13db/0x1d20 kernel/signal.c:2734 do_signal+0x37/0x640 arch/x86/kernel/signal.c:815 exit_to_usermode_loop arch/x86/entry/common.c:160 [inline] prepare_exit_to_usermode+0x326/0x5b0 arch/x86/entry/common.c:195 syscall_return_slowpath+0x113/0x4a0 arch/x86/entry/common.c:278 do_syscall_64+0x11f/0x1c0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b349 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe4eafc7cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 000000000075bf28 RCX: 000000000045b349 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000075bf2c RBP: 000000000075bf20 R08: 000000000000000e R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000075bf2c R13: 00007ffcf696b80f R14: 00007fe4eafc89c0 R15: 000000000075bf2c