rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10443 ticks this GP) idle=ee1/1/0x4000000000000000 softirq=9729/9740 fqs=2218 (t=10502 jiffies g=8717 q=8272) NMI backtrace for cpu 1 CPU: 1 PID: 9200 Comm: syz-executor025 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+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+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_irqrestore include/linux/spinlock_api_smp.h:161 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194 Code: 74 24 10 e8 3a 17 26 f8 48 89 ef e8 82 8d 26 f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 83 4e 1a f8 65 8b 05 2c a1 cc 76 85 c0 74 0a 5b 5d c3 e8 30 fa RSP: 0018:ffffc90000dc0ea0 EFLAGS: 00000206 RAX: 0000000000000046 RBX: 0000000000000200 RCX: 1ffffffff1adbb3d RDX: 0000000000000000 RSI: ffffffff817c4961 RDI: 0000000000000001 RBP: ffff888018db9630 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff817c4948 R11: 0000000000000000 R12: ffff88803b2ea780 R13: ffff888018db9630 R14: ffff88803b2ebc80 R15: 0000000000000001 spin_unlock_irqrestore include/linux/spinlock.h:418 [inline] skb_dequeue+0x125/0x180 net/core/skbuff.c:3206 ieee80211_tasklet_handler+0x34/0x130 net/mac80211/main.c:228 tasklet_action_common.constprop.0+0x201/0x2e0 kernel/softirq.c:783 __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:check_kcov_mode+0x2c/0x40 kernel/kcov.c:174 Code: 05 39 d8 8b 7e 89 c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b 96 3c 15 00 00 85 d2 74 0b 8b 86 18 15 00 00 <39> f8 0f 94 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 31 c0 RSP: 0018:ffffc900036b7758 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffea0000cd76c0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff888017678000 RDI: 0000000000000003 RBP: ffffea0000cd76c0 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff819eef70 R11: 0000000000000000 R12: ffffea0000cd76c8 R13: 0000000000000000 R14: ffffea0000cd7688 R15: ffffea0000cd76c0 write_comp_data kernel/kcov.c:218 [inline] __sanitizer_cov_trace_const_cmp8+0x1d/0x70 kernel/kcov.c:291 _compound_head include/linux/page-flags.h:187 [inline] PageUnevictable include/linux/page-flags.h:413 [inline] mark_page_accessed+0x330/0x1b00 mm/swap.c:430 zap_pte_range mm/memory.c:1359 [inline] zap_pmd_range mm/memory.c:1481 [inline] zap_pud_range mm/memory.c:1510 [inline] zap_p4d_range mm/memory.c:1531 [inline] unmap_page_range+0xd45/0x2a10 mm/memory.c:1552 unmap_single_vma+0x198/0x310 mm/memory.c:1597 unmap_vmas+0x16d/0x2f0 mm/memory.c:1629 exit_mmap+0x1d0/0x620 mm/mmap.c:3195 __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:2823 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: 0033:0x447559 Code: Unable to access opcode bytes at RIP 0x44752f. RSP: 002b:00007fe14263b318 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00000000004d21c8 RCX: 0000000000447559 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00000000004d21cc RBP: 00000000004d21c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00000000004d21cc R13: 00007ffc6d25f0ff R14: 00007fe14263b400 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 74 24 je 0x26 2: 10 e8 adc %ch,%al 4: 3a 17 cmp (%rdi),%dl 6: 26 f8 es clc 8: 48 89 ef mov %rbp,%rdi b: e8 82 8d 26 f8 callq 0xf8268d92 10: 81 e3 00 02 00 00 and $0x200,%ebx 16: 75 25 jne 0x3d 18: 9c pushfq 19: 58 pop %rax 1a: f6 c4 02 test $0x2,%ah 1d: 75 2d jne 0x4c 1f: 48 85 db test %rbx,%rbx 22: 74 01 je 0x25 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 83 4e 1a f8 callq 0xf81a4eb2 <-- trapping instruction 2f: 65 8b 05 2c a1 cc 76 mov %gs:0x76cca12c(%rip),%eax # 0x76cca162 36: 85 c0 test %eax,%eax 38: 74 0a je 0x44 3a: 5b pop %rbx 3b: 5d pop %rbp 3c: c3 retq 3d: e8 .byte 0xe8 3e: 30 fa xor %bh,%dl