INFO: rcu_preempt self-detected stall on CPU 0-...: (1 GPs behind) idle=2d6/140000000000002/0 softirq=20507/20510 fqs=62 (t=10500 jiffies g=3781 c=3780 q=461) NMI backtrace for cpu 0 CPU: 0 PID: 10402 Comm: syz-executor.0 Not tainted 4.14.171-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x94 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x141/0x189 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline] rcu_dump_cpu_stacks+0x186/0x1d2 kernel/rcu/tree.c:1396 print_cpu_stall kernel/rcu/tree.c:1542 [inline] check_cpu_stall kernel/rcu/tree.c:1610 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0x43d/0xd0a kernel/rcu/tree.c:2792 update_process_times+0x31/0x70 kernel/time/timer.c:1590 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:165 tick_sched_timer+0x43/0x130 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x270/0xbc0 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1d8/0x5d0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x11c/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:check_memory_region+0x21/0x190 mm/kasan/kasan.c:266 RSP: 0018:ffff8880aec07790 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff10 RAX: ffff7fffffffffff RBX: ffff8880aec078a8 RCX: ffffffff81295449 RDX: 0000000000000001 RSI: 0000000000000060 RDI: ffff8880aec07828 RBP: ffff8880aec077a0 R08: ffff88808d8b0240 R09: ffffed1013176ce5 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880aec07828 R13: 0000000000000060 R14: 0000000000000000 R15: ffff8880aec07828 memset+0x24/0x40 mm/kasan/kasan.c:285 memset include/linux/string.h:332 [inline] __unwind_start+0x29/0x3d0 arch/x86/kernel/unwind_frame.c:393 unwind_start arch/x86/include/asm/unwind.h:60 [inline] __save_stack_trace+0x4a/0xd0 arch/x86/kernel/stacktrace.c:43 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:489 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc+0x11b/0x780 mm/slab.c:3550 skb_clone+0x129/0x320 net/core/skbuff.c:1282 frame_get_tagged_skb net/hsr/hsr_forward.c:195 [inline] hsr_forward_do net/hsr/hsr_forward.c:283 [inline] hsr_forward_skb+0xf46/0x1940 net/hsr/hsr_forward.c:373 send_hsr_supervision_frame+0x908/0xf40 net/hsr/hsr_device.c:321 hsr_announce+0xf5/0x340 net/hsr/hsr_device.c:350 call_timer_fn+0x161/0x670 kernel/time/timer.c:1279 expire_timers kernel/time/timer.c:1318 [inline] __run_timers kernel/time/timer.c:1636 [inline] __run_timers kernel/time/timer.c:1604 [inline] run_timer_softirq+0x5b7/0x1520 kernel/time/timer.c:1649 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x160/0x1b0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_acquire+0x1ea/0x430 kernel/locking/lockdep.c:3997 RSP: 0018:ffff888058def928 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0fe2ce1 RBX: ffff88808d8b0240 RCX: 000000007c6480c9 RDX: dffffc0000000000 RSI: ffff88808d8b0ae8 RDI: 0000000000000282 RBP: ffff888058def970 R08: 0000000000005126 R09: ffffffff895781b0 R10: ffff88808d8b0ae8 R11: ffff88808d8b0240 R12: ffffffff8802dd18 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] mnt_alloc_id fs/namespace.c:108 [inline] alloc_vfsmnt+0x63/0x7d0 fs/namespace.c:209 clone_mnt+0x70/0xee0 fs/namespace.c:1086 copy_tree+0x33b/0x8a0 fs/namespace.c:1837 copy_mnt_ns+0x11c/0x8c0 fs/namespace.c:2977 create_new_namespaces+0xc9/0x720 kernel/nsproxy.c:75 copy_namespaces+0x284/0x310 kernel/nsproxy.c:165 copy_process.part.0+0x2603/0x6a70 kernel/fork.c:1774 copy_process kernel/fork.c:1586 [inline] _do_fork+0x19e/0xce0 kernel/fork.c:2070 SYSC_clone kernel/fork.c:2180 [inline] SyS_clone+0x37/0x50 kernel/fork.c:2174 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c6c9 RSP: 002b:00007f8a3450cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f8a3450d6d4 RCX: 000000000045c6c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000030020100 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000074 R14: 00000000004c2f99 R15: 000000000076bf2c INFO: rcu_sched detected stalls on CPUs/tasks: 0-...: (1 GPs behind) idle=2d6/140000000000002/0 softirq=20507/20510 fqs=70 (detected by 1, t=10503 jiffies, g=2771, c=2770, q=6) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7 Comm: ksoftirqd/0 Not tainted 4.14.171-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a9cd61c0 task.stack: ffff8880a9ce8000 RIP: 0010:tcp_send_delayed_ack+0x177/0x3d0 net/ipv4/tcp_output.c:3588 RSP: 0018:ffff8880a9cef340 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000004 RCX: ffff8880a9cd6a40 RDX: 1ffff1101223bcd4 RSI: ffff8880911de0a0 RDI: ffff8880911de6a4 RBP: ffff8880a9cef370 R08: ffff888097c651ec R09: ffff8880911de110 R10: ffffed100d0761bf R11: ffff8880683b0dff R12: ffff8880911de000 R13: 00000001000003d5 R14: 000000000000000f R15: 000000008ea7660b FS: 0000000000000000(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd0a1c3fd0 CR3: 0000000090557000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __tcp_ack_snd_check+0x260/0x3a0 net/ipv4/tcp_input.c:5148 tcp_rcv_established+0x1179/0x1650 net/ipv4/tcp_input.c:5535 tcp_v4_do_rcv+0x56c/0x7f0 net/ipv4/tcp_ipv4.c:1467 tcp_v4_rcv+0x2571/0x31a0 net/ipv4/tcp_ipv4.c:1741 ip_local_deliver_finish+0x25e/0xad0 net/ipv4/ip_input.c:216 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] ip_local_deliver+0x1c3/0x4a0 net/ipv4/ip_input.c:257 dst_input include/net/dst.h:468 [inline] ip_rcv_finish+0x7be/0x1a50 net/ipv4/ip_input.c:396 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] ip_rcv+0xaa5/0x112b net/ipv4/ip_input.c:493 __netif_receive_skb_core+0x1ebe/0x2cb0 net/core/dev.c:4477 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4515 netif_receive_skb_internal+0xe4/0x5a0 net/core/dev.c:4588 napi_skb_finish net/core/dev.c:4949 [inline] napi_gro_receive+0x2f8/0x410 net/core/dev.c:4980 receive_buf+0x534/0x4770 drivers/net/virtio_net.c:852 virtnet_receive drivers/net/virtio_net.c:1098 [inline] virtnet_poll+0x515/0xa6e drivers/net/virtio_net.c:1189 napi_poll net/core/dev.c:5598 [inline] net_rx_action+0x490/0xf80 net/core/dev.c:5664 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 run_ksoftirqd kernel/softirq.c:670 [inline] run_ksoftirqd+0x8c/0x1b0 kernel/softirq.c:662 smpboot_thread_fn+0x5f4/0x960 kernel/smpboot.c:164 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 4c 89 f2 48 c1 ea 03 49 01 c5 48 b8 00 00 00 00 00 fc ff df 0f b6 04 02 84 c0 74 06 0f 8e dc 01 00 00 45 0f b6 b4 24 a0 06 00 00 <4d> 8d bc 24 a8 06 00 00 41 f6 c6 02 0f 84 9c 00 00 00 e8 b2 d0 batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state device veth1_macvtap left promiscuous mode device veth0_macvtap left promiscuous mode device veth1_vlan left promiscuous mode device veth0_vlan left promiscuous mode device hsr_slave_1 left promiscuous mode device hsr_slave_0 left promiscuous mode team0 (unregistering): Port device team_slave_1 removed team0 (unregistering): Port device team_slave_0 removed bond0 (unregistering): Releasing backup interface bond_slave_1 bond0 (unregistering): Releasing backup interface bond_slave_0 bond0 (unregistering): Released all slaves IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 chnl_net:caif_netlink_parms(): no params data found chnl_net:caif_netlink_parms(): no params data found bridge0: port 1(bridge_slave_0) entered blocking state bridge0: port 1(bridge_slave_0) entered disabled state device bridge_slave_0 entered promiscuous mode bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_1 entered promiscuous mode bond0: Enslaving bond_slave_0 as an active interface with an up link bond0: Enslaving bond_slave_1 as an active interface with an up link IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready team0: Port device team_slave_0 added IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready team0: Port device team_slave_1 added bridge0: port 1(bridge_slave_0) entered blocking state bridge0: port 1(bridge_slave_0) entered disabled state device bridge_slave_0 entered promiscuous mode bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_1 entered promiscuous mode batman_adv: batadv0: Adding interface: batadv_slave_0 batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active batman_adv: batadv0: Adding interface: batadv_slave_1 batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active bond0: Enslaving bond_slave_0 as an active interface with an up link IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready bond0: Enslaving bond_slave_1 as an active interface with an up link IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready device hsr_slave_0 entered promiscuous mode device hsr_slave_1 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready team0: Port device team_slave_0 added IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready team0: Port device team_slave_1 added batman_adv: batadv0: Adding interface: batadv_slave_0 batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active batman_adv: batadv0: Adding interface: batadv_slave_1 batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready device hsr_slave_0 entered promiscuous mode device hsr_slave_1 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state device veth1_macvtap left promiscuous mode device veth0_macvtap left promiscuous mode device veth1_vlan left promiscuous mode device veth0_vlan left promiscuous mode device hsr_slave_1 left promiscuous mode device hsr_slave_0 left promiscuous mode