rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10469 ticks this GP) idle=ac5/1/0x4000000000000000 softirq=71623/71632 fqs=4597 (t=10500 jiffies g=109737 q=2883) NMI backtrace for cpu 1 CPU: 1 PID: 3577 Comm: syz-executor.4 Not tainted 5.14.0-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:105 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:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x7/0x60 kernel/kcov.c:197 Code: fd ff ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 00 65 8b 05 39 d2 8b 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 40 f0 01 00 a9 RSP: 0018:ffffc90000dc0b60 EFLAGS: 00000282 RAX: 0000000000000101 RBX: ffff8880782452f0 RCX: 0000000000000100 RDX: 1ffff11003ec6c12 RSI: ffffffff871f0414 RDI: ffffffff8d6fff50 RBP: ffff88809dd36000 R08: 0000000000000000 R09: 0000000000000008 R10: ffffffff871f03e9 R11: 0000000000000008 R12: 0000000000000008 R13: dffffc0000000000 R14: 0000000000000008 R15: ffffffff8d6fff20 deliver_ptype_list_skb net/core/dev.c:2224 [inline] __netif_receive_skb_core+0xdbf/0x3640 net/core/dev.c:5392 __netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:5434 __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5550 process_backlog+0x2a5/0x6c0 net/core/dev.c:6427 __napi_poll+0xaf/0x440 net/core/dev.c:6982 napi_poll net/core/dev.c:7049 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:7136 __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:pte_none arch/x86/include/asm/pgtable.h:727 [inline] RIP: 0010:zap_pte_range mm/memory.c:1326 [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+0xa9a/0x2a10 mm/memory.c:1552 Code: 00 f0 ff ff 48 89 44 24 08 e8 82 f8 ca ff 48 8b 04 24 48 c1 e8 03 42 80 3c 30 00 0f 85 04 1a 00 00 48 8b 04 24 31 ff 4c 8b 20 <4c> 89 e3 48 83 e3 9f 48 89 de e8 b7 fd ca ff 48 85 db 0f 85 ef fd RSP: 0018:ffffc9000c72f7b0 EFLAGS: 00000246 RAX: ffff88808690e270 RBX: 00000000004af000 RCX: 0000000000000000 RDX: ffff888019150000 RSI: ffffffff81ab253e RDI: 0000000000000000 RBP: ffffea0001ba9f40 R08: 00000000004af000 R09: 0000000000000000 R10: ffffffff81ab251a R11: 0000000000000000 R12: 000000006ea7e025 R13: ffffea0001ba9f08 R14: dffffc0000000000 R15: 000000000044f000 unmap_single_vma+0x198/0x310 mm/memory.c:1597 unmap_vmas+0x16d/0x2f0 mm/memory.c:1629 exit_mmap+0x1d0/0x620 mm/mmap.c:3194 __mmput+0x122/0x470 kernel/fork.c:1103 mmput+0x58/0x60 kernel/fork.c:1124 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:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 Code: Unable to access opcode bytes at RIP 0x4665cf. RSP: 002b:00007ff1c25df188 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: 0000000000235000 RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 000000000000000a RSI: 0000000020001900 RDI: 0000000000000005 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fffeae70a7f R14: 00007ff1c25df300 R15: 0000000000022000 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: b9 ff ff ff ff mov $0xffffffff,%ecx 5: ba 08 00 00 00 mov $0x8,%edx a: 4d 8b 03 mov (%r11),%r8 d: 48 0f bd ca bsr %rdx,%rcx 11: 49 8b 45 00 mov 0x0(%r13),%rax 15: 48 63 c9 movslq %ecx,%rcx 18: e9 64 ff ff ff jmpq 0xffffff81 1d: 0f 1f 00 nopl (%rax) 20: 65 8b 05 39 d2 8b 7e mov %gs:0x7e8bd239(%rip),%eax # 0x7e8bd260 * 27: 89 c1 mov %eax,%ecx <-- trapping instruction 29: 48 8b 34 24 mov (%rsp),%rsi 2d: 81 e1 00 01 00 00 and $0x100,%ecx 33: 65 48 8b 14 25 40 f0 mov %gs:0x1f040,%rdx 3a: 01 00 3c: a9 .byte 0xa9