rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (9064 ticks this GP) idle=de6/1/0x4000000000000000 softirq=21826/21827 fqs=4845 (t=10500 jiffies g=29645 q=372) NMI backtrace for cpu 1 CPU: 1 PID: 13552 Comm: syz-executor.0 Not tainted 5.10.0-rc6-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+0x107/0x163 lib/dump_stack.c:118 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+0x1e3/0x21e kernel/rcu/tree_stall.h:331 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline] check_cpu_stall kernel/rcu/tree_stall.h:637 [inline] rcu_pending kernel/rcu/tree.c:3694 [inline] rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567 update_process_times+0x77/0xd0 kernel/time/timer.c:1709 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline] sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:__tcp_send_ack net/ipv4/tcp_output.c:3973 [inline] RIP: 0010:tcp_send_ack+0x75/0xa0 net/ipv4/tcp_output.c:3973 Code: 48 8d bd 00 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 04 3c 03 7e 1c 8b b5 00 08 00 00 <48> 89 ef e8 b3 0f ff ff 5b 5d e9 4c 06 fb f9 e8 97 84 3c fa eb a6 RSP: 0018:ffffc90000d90278 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff8774fdf1 RDX: 1ffff110058733f0 RSI: 0000000046d024d7 RDI: ffff88802c399f80 RBP: ffff88802c399780 R08: 0000000000000001 R09: ffffffff8ebaf71f R10: 0000000000000007 R11: 0000000000000001 R12: ffff8880115165c0 R13: 0000000000000000 R14: ffff888011516500 R15: ffff88802c399780 tcp_validate_incoming+0x12e8/0x1b60 net/ipv4/tcp_input.c:5585 tcp_rcv_established+0x543/0x1eb0 net/ipv4/tcp_input.c:5855 tcp_v4_do_rcv+0x5d1/0x870 net/ipv4/tcp_ipv4.c:1668 tcp_v4_rcv+0x2d10/0x3750 net/ipv4/tcp_ipv4.c:2050 ip_protocol_deliver_rcu+0x5c/0x8a0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x20a/0x370 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:301 [inline] NF_HOOK include/linux/netfilter.h:295 [inline] ip_local_deliver+0x1b3/0x200 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:449 [inline] ip_sublist_rcv_finish+0x9a/0x2c0 net/ipv4/ip_input.c:550 ip_list_rcv_finish.constprop.0+0x514/0x6e0 net/ipv4/ip_input.c:600 ip_sublist_rcv net/ipv4/ip_input.c:608 [inline] ip_list_rcv+0x34e/0x490 net/ipv4/ip_input.c:643 __netif_receive_skb_list_ptype net/core/dev.c:5354 [inline] __netif_receive_skb_list_core+0x549/0x8e0 net/core/dev.c:5402 __netif_receive_skb_list net/core/dev.c:5454 [inline] netif_receive_skb_list_internal+0x777/0xd70 net/core/dev.c:5564 gro_normal_list net/core/dev.c:5718 [inline] gro_normal_list net/core/dev.c:5714 [inline] gro_normal_one+0x16f/0x260 net/core/dev.c:5730 napi_skb_finish net/core/dev.c:6058 [inline] napi_gro_receive+0x56c/0x6c0 net/core/dev.c:6090 receive_buf+0x1014/0x5ce0 drivers/net/virtio_net.c:1087 virtnet_receive drivers/net/virtio_net.c:1351 [inline] virtnet_poll+0x568/0xd90 drivers/net/virtio_net.c:1456 napi_poll net/core/dev.c:6759 [inline] net_rx_action+0x4dc/0x1100 net/core/dev.c:6829 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x132/0x200 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:write_comp_data+0x2f/0x80 kernel/kcov.c:218 Code: 05 26 f4 91 7e 65 48 8b 34 25 00 f0 01 00 a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b 86 5c 14 00 00 85 c0 74 4f 8b 86 38 14 00 00 <83> f8 03 75 44 48 8b 86 40 14 00 00 8b b6 3c 14 00 00 4c 8b 00 48 RSP: 0018:ffffc90009aaf790 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffc90009aaf890 RCX: ffffffff81a148f5 RDX: 00000000ffffffef RSI: ffff88806c16b480 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88806c16b487 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880222fefb0 R13: ffffffffffffffef R14: dffffc0000000000 R15: 0000000000414000 add_mm_rss_vec mm/memory.c:490 [inline] zap_pte_range mm/memory.c:1303 [inline] zap_pmd_range mm/memory.c:1357 [inline] zap_pud_range mm/memory.c:1386 [inline] zap_p4d_range mm/memory.c:1407 [inline] unmap_page_range+0xf45/0x2640 mm/memory.c:1428 unmap_single_vma+0x198/0x300 mm/memory.c:1473 unmap_vmas+0x168/0x2e0 mm/memory.c:1505 exit_mmap+0x2b1/0x530 mm/mmap.c:3222 __mmput+0x122/0x470 kernel/fork.c:1079 mmput+0x53/0x60 kernel/fork.c:1100 exit_mm kernel/exit.c:486 [inline] do_exit+0xa72/0x29b0 kernel/exit.c:796 do_group_exit+0x125/0x310 kernel/exit.c:906 get_signal+0x42a/0x1f10 kernel/signal.c:2758 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45de79 Code: Unable to access opcode bytes at RIP 0x45de4f. RSP: 002b:00007f30f71c0c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: 0000000000000003 RBX: 0000000000000003 RCX: 000000000045de79 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 0000000000000002 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffdb68103ff R14: 00007f30f71c19c0 R15: 000000000118bf2c