INFO: rcu detected stall in mld_dad_timer

Kernel	Title	Rank 🛈	Repro	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.14	INFO: rcu detected stall in mld_dad_timer_expire	1	syz, C	done	1	2516d	2516d	1/1	fixed on 2019/12/09 13:28
upstream	INFO: rcu detected stall in mld_dad_timer_expire net	1			3	2520d	2521d	13/29	fixed on 2019/10/09 10:54
upstream	INFO: rcu detected stall in mld_dad_timer_expire (2) net	1			2	2441d	2441d	0/29	closed as invalid on 2019/11/29 14:24

NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10500 ticks this GP) idle=15a/1/0x4000000000000004 softirq=9338/9338 fqs=0 rcu: (t=10500 jiffies g=7125 q=1787) rcu: rcu_preempt kthread starved for 10500 jiffies! g7125 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt I29208 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x4cf/0xfe0 kernel/time/timer.c:1825 rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 NMI backtrace for cpu 0 CPU: 0 PID: 7904 Comm: syz-executor.2 Not tainted 4.19.142-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2fe lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15f/0x19c kernel/rcu/tree.c:1340 print_cpu_stall kernel/rcu/tree.c:1478 [inline] check_cpu_stall kernel/rcu/tree.c:1550 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0x62d/0xe19 kernel/rcu/tree.c:2682 update_process_times+0x2a/0xb0 kernel/time/timer.c:1650 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1521 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:kfree+0x123/0x210 mm/slab.c:3823 Code: 89 ea 48 89 ee 4c 89 e7 e8 da ee ff ff f6 c7 02 74 ca e8 d0 3f cf ff 48 83 3d 20 b7 32 07 00 0f 84 eb 00 00 00 48 89 df 57 9d <0f> 1f 44 00 00 5b 5d 41 5c 41 5d c3 65 8b 05 ea dc 61 7e 83 f8 3f RSP: 0018:ffff8880ae606c70 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 0000000000000282 RCX: 1ffff11012347d67 RDX: 0000000000000000 RSI: ffff888091a3ec08 RDI: 0000000000000282 RBP: ffff88808f567780 R08: 0000000000400000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88812c39c940 R13: ffffffff85b33ece R14: 0000000000000000 R15: ffff88808f567870 skb_free_head net/core/skbuff.c:554 [inline] skb_release_data+0x6de/0x920 net/core/skbuff.c:574 skb_release_all net/core/skbuff.c:631 [inline] __kfree_skb net/core/skbuff.c:645 [inline] kfree_skb+0x11a/0x3d0 net/core/skbuff.c:663 enqueue_to_backlog+0x272/0xe00 net/core/dev.c:4263 netif_rx_internal+0xfd/0x670 net/core/dev.c:4491 loopback_xmit+0x2c7/0x710 drivers/net/loopback.c:95 __netdev_start_xmit include/linux/netdevice.h:4333 [inline] netdev_start_xmit include/linux/netdevice.h:4347 [inline] xmit_one net/core/dev.c:3256 [inline] dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272 __dev_queue_xmit+0x269d/0x2e00 net/core/dev.c:3838 neigh_hh_output include/net/neighbour.h:491 [inline] neigh_output include/net/neighbour.h:499 [inline] ip_finish_output2+0xb6d/0x1540 net/ipv4/ip_output.c:229 ip_do_fragment+0xe2f/0x2270 net/ipv4/ip_output.c:814 ip_fragment.constprop.0+0x174/0x240 net/ipv4/ip_output.c:550 ip_finish_output+0x799/0xcd0 net/ipv4/ip_output.c:315 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_output+0x203/0x5f0 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:455 [inline] ip_local_out+0xaf/0x170 net/ipv4/ip_output.c:124 iptunnel_xmit+0x63b/0x9d0 net/ipv4/ip_tunnel_core.c:91 geneve_xmit_skb drivers/net/geneve.c:857 [inline] geneve_xmit+0xdcf/0x28b0 drivers/net/geneve.c:929 __netdev_start_xmit include/linux/netdevice.h:4333 [inline] netdev_start_xmit include/linux/netdevice.h:4347 [inline] xmit_one net/core/dev.c:3256 [inline] dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272 __dev_queue_xmit+0x269d/0x2e00 net/core/dev.c:3838 neigh_hh_output include/net/neighbour.h:491 [inline] neigh_output include/net/neighbour.h:499 [inline] ip6_finish_output2+0xde7/0x2290 net/ipv6/ip6_output.c:120 ip6_finish_output+0x7eb/0xc10 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x205/0x770 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:455 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] mld_sendpack+0x674/0x1060 net/ipv6/mcast.c:1684 mld_send_initial_cr.part.0+0x106/0x150 net/ipv6/mcast.c:2101 mld_send_initial_cr net/ipv6/mcast.c:1196 [inline] mld_dad_timer_expire+0x183/0x5e0 net/ipv6/mcast.c:2120 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1703 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1716 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:544 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 </IRQ> RIP: 0010:__orc_find+0xb1/0xf0 arch/x86/kernel/unwind_orc.c:56 Code: 39 c1 73 b0 4c 8d 63 fc 49 39 ec 73 b3 4d 29 ee 49 c1 fe 02 4b 8d 04 76 48 8d 04 46 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f <c3> 48 83 c4 10 31 c0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 89 f0 eb RSP: 0018:ffff8880471ce298 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: ffffffff8a6627d2 RBX: 1ffff11008e39c5c RCX: ffffffff85be6baf RDX: 0000000000000000 RSI: ffffffff8a6627cc RDI: ffffffff89f53be8 RBP: 0000000000000001 R08: ffffffff8a6627de R09: ffffffff8a6627cc R10: 0000000000066061 R11: 00000000000f4be6 R12: ffff8880471ce3d0 R13: ffff8880471ce3bd R14: ffff8880471ce3c0 R15: ffff8880471ce388 orc_find arch/x86/kernel/unwind_orc.c:159 [inline] unwind_next_frame+0x33b/0x1c60 arch/x86/kernel/unwind_orc.c:429 __save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553 kmem_cache_alloc_node_trace+0x151/0x3b0 mm/slab.c:3668 __do_kmalloc_node mm/slab.c:3688 [inline] __kmalloc_node_track_caller+0x38/0x70 mm/slab.c:3703 __kmalloc_reserve net/core/skbuff.c:137 [inline] __alloc_skb+0xae/0x560 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:995 [inline] nlmsg_new include/net/netlink.h:511 [inline] rtmsg_fib+0x1fb/0x4e0 net/ipv4/fib_semantics.c:415 fib_table_delete+0x77c/0xfb0 net/ipv4/fib_trie.c:1599 fib_magic+0x361/0x540 net/ipv4/fib_frontend.c:892 fib_del_ifaddr+0xd36/0xfd0 net/ipv4/fib_frontend.c:1092 fib_inetaddr_event+0xb4/0x29b net/ipv4/fib_frontend.c:1232 notifier_call_chain+0xc0/0x230 kernel/notifier.c:93 __blocking_notifier_call_chain kernel/notifier.c:317 [inline] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] blocking_notifier_call_chain kernel/notifier.c:328 [inline] blocking_notifier_call_chain+0x85/0xa0 kernel/notifier.c:325 __inet_del_ifa+0x534/0xba0 net/ipv4/devinet.c:416 inet_del_ifa net/ipv4/devinet.c:446 [inline] inetdev_destroy net/ipv4/devinet.c:311 [inline] inetdev_event+0x5cb/0x1230 net/ipv4/devinet.c:1545 notifier_call_chain+0xc0/0x230 kernel/notifier.c:93 call_netdevice_notifiers_mtu net/core/dev.c:1785 [inline] dev_set_mtu_ext+0x384/0x580 net/core/dev.c:7810 do_setlink+0x484/0x3540 net/core/rtnetlink.c:2412 rtnl_group_changelink net/core/rtnetlink.c:2925 [inline] rtnl_newlink+0xbc0/0x15b0 net/core/rtnetlink.c:3083 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4778 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2115 __sys_sendmsg net/socket.c:2153 [inline] __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2160 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d5b9 Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2d91c88c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002ce80 RCX: 000000000045d5b9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffe5e3913ff R14: 00007f2d91c899c0 R15: 000000000118cf4c rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 10675 jiffies s: 333 root: 0x1/. rcu: blocking rcu_node structures: Task dump for CPU 0: syz-executor.2 R running task 22312 7904 6494 0x8000000e Call Trace: