rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (1 GPs behind) idle=063/1/0x4000000000000000 softirq=179428/179429 fqs=5083 (t=10502 jiffies g=347425 q=35433) NMI backtrace for cpu 1 CPU: 1 PID: 32059 Comm: syz-executor.3 Not tainted 5.15.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline] check_cpu_stall kernel/rcu/tree_stall.h:711 [inline] rcu_pending kernel/rcu/tree.c:3880 [inline] rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2599 update_process_times+0x16d/0x200 kernel/time/timer.c:1785 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 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:202 Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 8e 74 22 f8 48 89 ef e8 d6 ea 22 f8 e8 d1 51 43 f8 fb bf 01 00 00 00 36 ab 16 f8 65 8b 05 af e2 c9 76 85 c0 74 02 5d c3 e8 cb 37 c8 RSP: 0018:ffffc90000fd8e08 EFLAGS: 00000202 RAX: 000000000095333e RBX: ffffffff873bc230 RCX: 1ffffffff1fa0f62 RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000001 RBP: ffff8880b9d20240 R08: 0000000000000001 R09: ffffffff8fd00937 R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90000fd8e98 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880b9d20240 expire_timers kernel/time/timer.c:1465 [inline] __run_timers.part.0+0x665/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:zap_pte_range mm/memory.c:1349 [inline] RIP: 0010:zap_pmd_range mm/memory.c:1481 [inline] RIP: 0010:zap_pud_range mm/memory.c:1510 [inline] RIP: 0010:zap_p4d_range mm/memory.c:1531 [inline] RIP: 0010:unmap_page_range+0xc32/0x2a10 mm/memory.c:1552 Code: 48 0f 43 42 18 48 89 42 18 4c 89 e0 48 c1 e8 03 42 0f b6 04 30 84 c0 74 08 3c 01 0f 8e 7f 19 00 00 48 8b 44 24 10 80 48 20 08 <48> 85 ed 0f 84 05 fe ff ff e8 40 b2 ca ff 4c 8d 65 08 4c 89 e0 48 RSP: 0018:ffffc9000c1ff7b0 EFLAGS: 00000206 RAX: ffffc9000c1ffa80 RBX: 0000000000000001 RCX: ffffc9000c1ffa80 RDX: ffffc9000c1ffa80 RSI: ffffffff81aa8234 RDI: ffffc9000c1ffa98 RBP: ffffea0000f31440 R08: 000000000003cc51 R09: 0000000000000001 R10: ffffffff81aa81fc R11: 0000000000000000 R12: ffffc9000c1ffaa0 R13: 0000000000000007 R14: dffffc0000000000 R15: 00007f5c42cf1000 unmap_single_vma+0x198/0x310 mm/memory.c:1597 unmap_vmas+0x16d/0x2f0 mm/memory.c:1629 exit_mmap+0x1d0/0x630 mm/mmap.c:3171 __mmput+0x122/0x4b0 kernel/fork.c:1115 mmput+0x58/0x60 kernel/fork.c:1136 exit_mm kernel/exit.c:501 [inline] do_exit+0xabc/0x2a30 kernel/exit.c:812 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2868 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f5c44d70922 Code: Unable to access opcode bytes at RIP 0x7f5c44d708f8. RSP: 002b:00007f5c422e70f8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 RAX: 0000000020148000 RBX: 0000000000008011 RCX: 00007f5c44d70922 RDX: 0000000000000003 RSI: 0000000000004940 RDI: 0000000020148000 RBP: 0000000020148000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000008011 R11: 0000000000000206 R12: 0000000020000100 R13: 0000000020ffc000 R14: 0000000020000340 R15: 0000000020148000 ---------------- Code disassembly (best guess): 0: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 5: 55 push %rbp 6: 48 8b 74 24 08 mov 0x8(%rsp),%rsi b: 48 89 fd mov %rdi,%rbp e: 48 83 c7 18 add $0x18,%rdi 12: e8 8e 74 22 f8 callq 0xf82274a5 17: 48 89 ef mov %rbp,%rdi 1a: e8 d6 ea 22 f8 callq 0xf822eaf5 1f: e8 d1 51 43 f8 callq 0xf84351f5 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 36 ab 16 f8 callq 0xf816ab65 <-- trapping instruction 2f: 65 8b 05 af e2 c9 76 mov %gs:0x76c9e2af(%rip),%eax # 0x76c9e2e5 36: 85 c0 test %eax,%eax 38: 74 02 je 0x3c 3a: 5d pop %rbp 3b: c3 retq 3c: e8 .byte 0xe8 3d: cb lret 3e: 37 (bad) 3f: c8 .byte 0xc8