[ 171.800020][ T1599] [ 171.800107][ T1599] ======================================================== [ 171.800236][ T1599] WARNING: possible irq lock inversion dependency detected [ 171.800355][ T1599] 7.1.0-rc5-virtme #1 Not tainted [ 171.800438][ T1599] -------------------------------------------------------- [ 171.800554][ T1599] sysctl/1599 just changed the state of lock: [ 171.800665][ T1599] ffffffff90f7e8b8 (acaddr_hash_lock){+.+.}-{3:3}, at: __ipv6_dev_ac_dec+0x236/0x5d0 [ 171.800813][ T1599] but this lock was taken by another, SOFTIRQ-READ-safe lock in the past: [ 171.800930][ T1599] (&ndev->lock){++.-}-{3:3} [ 171.800933][ T1599] [ 171.800933][ T1599] [ 171.800933][ T1599] and interrupts could create inverse lock ordering between them. [ 171.800933][ T1599] [ 171.801225][ T1599] [ 171.801225][ T1599] other info that might help us debug this: [ 171.801343][ T1599] Possible interrupt unsafe locking scenario: [ 171.801343][ T1599] [ 171.801462][ T1599] CPU0 CPU1 [ 171.801542][ T1599] ---- ---- [ 171.801625][ T1599] lock(acaddr_hash_lock); [ 171.801705][ T1599] local_irq_disable(); [ 171.801807][ T1599] lock(&ndev->lock); [ 171.801907][ T1599] lock(acaddr_hash_lock); [ 171.802006][ T1599] [ 171.802067][ T1599] lock(&ndev->lock); [ 171.802127][ T1599] [ 171.802127][ T1599] *** DEADLOCK *** [ 171.802127][ T1599] [ 171.802248][ T1599] 2 locks held by sysctl/1599: [ 171.802330][ T1599] #0: ff1100000a0a43e0 (sb_writers#3){.+.+}-{0:0}, at: ksys_write+0x116/0x250 [ 171.802477][ T1599] #1: ffffffff90e8c9c0 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_fixup_forwarding+0x4d/0x4d0 [ 171.802645][ T1599] [ 171.802645][ T1599] the shortest dependencies between 2nd lock and 1st lock: [ 171.802785][ T1599] -> (&ndev->lock){++.-}-{3:3} { [ 171.802869][ T1599] HARDIRQ-ON-W at: [ 171.802933][ T1599] __lock_acquire+0x378/0xc10 [ 171.803040][ T1599] lock_acquire.part.0+0xbc/0x260 [ 171.803140][ T1599] _raw_write_lock_bh+0x38/0x50 [ 171.803242][ T1599] addrconf_permanent_addr+0x108/0x9c0 [ 171.803362][ T1599] addrconf_notify+0x151/0xf30 [ 171.803466][ T1599] notifier_call_chain+0xb0/0x320 [ 171.803571][ T1599] __dev_notify_flags+0xde/0x280 [ 171.803680][ T1599] netif_change_flags+0xfe/0x190 [ 171.803781][ T1599] do_setlink.isra.0+0x1cc3/0x2750 [ 171.803883][ T1599] rtnl_newlink+0x8d1/0xef0 [ 171.803985][ T1599] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 171.804087][ T1599] netlink_rcv_skb+0x14e/0x3a0 [ 171.804188][ T1599] netlink_unicast+0x486/0x750 [ 171.804292][ T1599] netlink_sendmsg+0x735/0xc60 [ 171.804401][ T1599] ____sys_sendmsg+0x419/0x850 [ 171.804504][ T1599] ___sys_sendmsg+0x14e/0x1d0 [ 171.804614][ T1599] __sys_sendmsg+0x145/0x1f0 [ 171.804717][ T1599] do_syscall_64+0x117/0x590 [ 171.804820][ T1599] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 171.804941][ T1599] HARDIRQ-ON-R at: [ 171.805002][ T1599] __lock_acquire+0x378/0xc10 [ 171.805103][ T1599] lock_acquire.part.0+0xbc/0x260 [ 171.805204][ T1599] _raw_read_lock_bh+0x44/0x80 [ 171.805304][ T1599] inet6_fill_ifla6_attrs+0x1aee/0x21e0 [ 171.805425][ T1599] inet6_fill_link_af+0x5c/0xe0 [ 171.805527][ T1599] rtnl_fill_ifinfo.isra.0+0x1a45/0x2c20 [ 171.805654][ T1599] rtnl_getlink+0x9c9/0xeb0 [ 171.805754][ T1599] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 171.805861][ T1599] netlink_rcv_skb+0x14e/0x3a0 [ 171.805966][ T1599] netlink_unicast+0x486/0x750 [ 171.806073][ T1599] netlink_sendmsg+0x735/0xc60 [ 171.806175][ T1599] ____sys_sendmsg+0x419/0x850 [ 171.806278][ T1599] ___sys_sendmsg+0x14e/0x1d0 [ 171.806379][ T1599] __sys_sendmsg+0x145/0x1f0 [ 171.806481][ T1599] do_syscall_64+0x117/0x590 [ 171.806584][ T1599] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 171.806705][ T1599] IN-SOFTIRQ-R at: [ 171.806767][ T1599] __lock_acquire+0x378/0xc10 [ 171.806866][ T1599] lock_acquire.part.0+0xbc/0x260 [ 171.806966][ T1599] _raw_read_lock_bh+0x44/0x80 [ 171.807067][ T1599] ipv6_get_lladdr+0xa8/0x3f0 [ 171.807172][ T1599] ndisc_send_ns+0xf3/0x120 [ 171.807277][ T1599] ndisc_solicit+0x314/0x480 [ 171.807377][ T1599] neigh_probe+0xb3/0x100 [ 171.807482][ T1599] __neigh_event_send+0x802/0x1070 [ 171.807590][ T1599] neigh_resolve_output+0xbe/0x140 [ 171.807693][ T1599] ip6_finish_output2+0x423/0x1300 [ 171.807798][ T1599] ip6_finish_output+0x646/0xda0 [ 171.807899][ T1599] ip6_output+0x23f/0x7f0 [ 171.808005][ T1599] ip6_forward+0x10f4/0x2bd0 [ 171.808105][ T1599] ipv6_rcv+0x3c1/0x5a0 [ 171.808205][ T1599] __netif_receive_skb_one_core+0xfc/0x180 [ 171.808327][ T1599] process_backlog+0x2bc/0x1490 [ 171.808432][ T1599] __napi_poll+0xa7/0x3b0 [ 171.808535][ T1599] net_rx_action+0x513/0xf50 [ 171.808640][ T1599] handle_softirqs+0x1d8/0x940 [ 171.808741][ T1599] do_softirq+0xa9/0xe0 [ 171.808840][ T1599] __local_bh_enable_ip+0x113/0x140 [ 171.808942][ T1599] __neigh_event_send+0x30a/0x1070 [ 171.809044][ T1599] neigh_resolve_output+0xbe/0x140 [ 171.809145][ T1599] ip6_finish_output2+0x423/0x1300 [ 171.809246][ T1599] ip6_finish_output+0x646/0xda0 [ 171.809347][ T1599] ip6_output+0x23f/0x7f0 [ 171.809450][ T1599] ip6_send_skb+0xee/0x350 [ 171.809551][ T1599] rawv6_push_pending_frames+0x4cb/0xa90 [ 171.809678][ T1599] rawv6_sendmsg+0x1434/0x1a50 [ 171.809779][ T1599] __sys_sendto+0x2c9/0x400 [ 171.809882][ T1599] __x64_sys_sendto+0xe4/0x1f0 [ 171.809983][ T1599] do_syscall_64+0x117/0x590 [ 171.810083][ T1599] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 171.810203][ T1599] INITIAL USE at: [ 171.810264][ T1599] __lock_acquire+0x378/0xc10 [ 171.810365][ T1599] lock_acquire.part.0+0xbc/0x260 [ 171.810467][ T1599] _raw_write_lock_bh+0x38/0x50 [ 171.810568][ T1599] addrconf_permanent_addr+0x108/0x9c0 [ 171.810692][ T1599] addrconf_notify+0x151/0xf30 [ 171.810840][ T1599] notifier_call_chain+0xb0/0x320 [ 171.810939][ T1599] __dev_notify_flags+0xde/0x280 [ 171.811039][ T1599] netif_change_flags+0xfe/0x190 [ 171.811181][ T1599] do_setlink.isra.0+0x1cc3/0x2750 [ 171.811281][ T1599] rtnl_newlink+0x8d1/0xef0 [ 171.811381][ T1599] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 171.811523][ T1599] netlink_rcv_skb+0x14e/0x3a0 [ 171.811630][ T1599] netlink_unicast+0x486/0x750 [ 171.811731][ T1599] netlink_sendmsg+0x735/0xc60 [ 171.811877][ T1599] ____sys_sendmsg+0x419/0x850 [ 171.811977][ T1599] ___sys_sendmsg+0x14e/0x1d0 [ 171.812081][ T1599] __sys_sendmsg+0x145/0x1f0 [ 171.812224][ T1599] do_syscall_64+0x117/0x590 [ 171.812327][ T1599] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 171.812450][ T1599] INITIAL READ USE at: [ 171.812529][ T1599] __lock_acquire+0x378/0xc10 [ 171.812678][ T1599] lock_acquire.part.0+0xbc/0x260 [ 171.812798][ T1599] _raw_read_lock_bh+0x44/0x80 [ 171.812898][ T1599] inet6_fill_ifla6_attrs+0x1aee/0x21e0 [ 171.813064][ T1599] inet6_fill_link_af+0x5c/0xe0 [ 171.813165][ T1599] rtnl_fill_ifinfo.isra.0+0x1a45/0x2c20 [ 171.813328][ T1599] rtnl_getlink+0x9c9/0xeb0 [ 171.813430][ T1599] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 171.813528][ T1599] netlink_rcv_skb+0x14e/0x3a0 [ 171.813635][ T1599] netlink_unicast+0x486/0x750 [ 171.813782][ T1599] netlink_sendmsg+0x735/0xc60 [ 171.813884][ T1599] ____sys_sendmsg+0x419/0x850 [ 171.813990][ T1599] ___sys_sendmsg+0x14e/0x1d0 [ 171.814138][ T1599] __sys_sendmsg+0x145/0x1f0 [ 171.814240][ T1599] do_syscall_64+0x117/0x590 [ 171.814343][ T1599] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 171.814470][ T1599] } [ 171.814514][ T1599] ... key at: [] __key.37+0x0/0x40 [ 171.814642][ T1599] ... acquired at: [ 171.814703][ T1599] __lock_acquire+0x508/0xc10 [ 171.814829][ T1599] lock_acquire.part.0+0xbc/0x260 [ 171.814913][ T1599] _raw_spin_lock+0x33/0x40 [ 171.814995][ T1599] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 171.815096][ T1599] __ipv6_dev_ac_inc+0x57e/0x930 [ 171.815220][ T1599] addrconf_join_anycast+0x1bc/0x260 [ 171.815301][ T1599] __ipv6_ifa_notify+0x75b/0xad0 [ 171.815381][ T1599] addrconf_dad_completed+0x14b/0xe10 [ 171.815464][ T1599] addrconf_dad_work+0x3c1/0x930 [ 171.815594][ T1599] process_one_work+0xdf8/0x1410 [ 171.815679][ T1599] worker_thread+0x4f1/0xd60 [ 171.815758][ T1599] kthread+0x367/0x460 [ 171.815820][ T1599] ret_from_fork+0x474/0x6b0 [ 171.815943][ T1599] ret_from_fork_asm+0x11/0x20 [ 171.816026][ T1599] [ 171.816068][ T1599] -> (acaddr_hash_lock){+.+.}-{3:3} { [ 171.816153][ T1599] HARDIRQ-ON-W at: [ 171.816216][ T1599] __lock_acquire+0x378/0xc10 [ 171.816361][ T1599] lock_acquire.part.0+0xbc/0x260 [ 171.816462][ T1599] _raw_spin_lock+0x33/0x40 [ 171.816568][ T1599] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 171.816737][ T1599] __ipv6_dev_ac_inc+0x57e/0x930 [ 171.816836][ T1599] addrconf_join_anycast+0x1bc/0x260 [ 171.816938][ T1599] __ipv6_ifa_notify+0x75b/0xad0 [ 171.817083][ T1599] addrconf_dad_completed+0x14b/0xe10 [ 171.817187][ T1599] addrconf_dad_work+0x3c1/0x930 [ 171.817290][ T1599] process_one_work+0xdf8/0x1410 [ 171.817433][ T1599] worker_thread+0x4f1/0xd60 [ 171.817537][ T1599] kthread+0x367/0x460 [ 171.817622][ T1599] ret_from_fork+0x474/0x6b0 [ 171.817771][ T1599] ret_from_fork_asm+0x11/0x20 [ 171.817874][ T1599] SOFTIRQ-ON-W at: [ 171.817935][ T1599] __lock_acquire+0x378/0xc10 [ 171.818035][ T1599] lock_acquire.part.0+0xbc/0x260 [ 171.818184][ T1599] _raw_spin_lock+0x33/0x40 [ 171.818291][ T1599] __ipv6_dev_ac_dec+0x236/0x5d0 [ 171.818395][ T1599] addrconf_leave_anycast+0x1bc/0x260 [ 171.818542][ T1599] dev_forward_change+0x3b3/0x850 [ 171.818648][ T1599] addrconf_fixup_forwarding+0x2af/0x4d0 [ 171.818774][ T1599] addrconf_sysctl_forward+0x209/0x2b0 [ 171.818928][ T1599] proc_sys_call_handler+0x31b/0x480 [ 171.819036][ T1599] new_sync_write+0x333/0x750 [ 171.819137][ T1599] vfs_write+0x6a4/0xc10 [ 171.819286][ T1599] ksys_write+0x116/0x250 [ 171.819391][ T1599] do_syscall_64+0x117/0x590 [ 171.819496][ T1599] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 171.819666][ T1599] INITIAL USE at: [ 171.819728][ T1599] __lock_acquire+0x378/0xc10 [ 171.819832][ T1599] lock_acquire.part.0+0xbc/0x260 [ 171.819933][ T1599] _raw_spin_lock+0x33/0x40 [ 171.820076][ T1599] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 171.820199][ T1599] __ipv6_dev_ac_inc+0x57e/0x930 [ 171.820300][ T1599] addrconf_join_anycast+0x1bc/0x260 [ 171.820445][ T1599] __ipv6_ifa_notify+0x75b/0xad0 [ 171.820550][ T1599] addrconf_dad_completed+0x14b/0xe10 [ 171.820658][ T1599] addrconf_dad_work+0x3c1/0x930 [ 171.820804][ T1599] process_one_work+0xdf8/0x1410 [ 171.820904][ T1599] worker_thread+0x4f1/0xd60 [ 171.821005][ T1599] kthread+0x367/0x460 [ 171.821088][ T1599] ret_from_fork+0x474/0x6b0 [ 171.821233][ T1599] ret_from_fork_asm+0x11/0x20 [ 171.821334][ T1599] } [ 171.821375][ T1599] ... key at: [] acaddr_hash_lock+0x18/0x45a0 [ 171.821539][ T1599] ... acquired at: [ 171.821604][ T1599] mark_lock+0x1d7/0xa00 [ 171.821684][ T1599] mark_usage+0x105/0x170 [ 171.821763][ T1599] __lock_acquire+0x378/0xc10 [ 171.821885][ T1599] lock_acquire.part.0+0xbc/0x260 [ 171.821965][ T1599] _raw_spin_lock+0x33/0x40 [ 171.822045][ T1599] __ipv6_dev_ac_dec+0x236/0x5d0 [ 171.822125][ T1599] addrconf_leave_anycast+0x1bc/0x260 [ 171.822248][ T1599] dev_forward_change+0x3b3/0x850 [ 171.822329][ T1599] addrconf_fixup_forwarding+0x2af/0x4d0 [ 171.822431][ T1599] addrconf_sysctl_forward+0x209/0x2b0 [ 171.822510][ T1599] proc_sys_call_handler+0x31b/0x480 [ 171.822639][ T1599] new_sync_write+0x333/0x750 [ 171.822720][ T1599] vfs_write+0x6a4/0xc10 [ 171.822804][ T1599] ksys_write+0x116/0x250 [ 171.822885][ T1599] do_syscall_64+0x117/0x590 [ 171.823007][ T1599] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 171.823106][ T1599] [ 171.823146][ T1599] [ 171.823146][ T1599] stack backtrace: [ 171.823245][ T1599] CPU: 2 UID: 0 PID: 1599 Comm: sysctl Not tainted 7.1.0-rc5-virtme #1 PREEMPT(full) [ 171.823248][ T1599] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 171.823250][ T1599] Call Trace: [ 171.823252][ T1599] [ 171.823253][ T1599] dump_stack_lvl+0x6f/0xa0 [ 171.823257][ T1599] print_irq_inversion_bug.part.0.cold+0xe6/0x143 [ 171.823260][ T1599] mark_lock_irq+0x989/0x9c0 [ 171.823263][ T1599] mark_lock+0x1d7/0xa00 [ 171.823265][ T1599] mark_usage+0x105/0x170 [ 171.823266][ T1599] __lock_acquire+0x378/0xc10 [ 171.823268][ T1599] lock_acquire.part.0+0xbc/0x260 [ 171.823270][ T1599] ? __ipv6_dev_ac_dec+0x236/0x5d0 [ 171.823271][ T1599] ? rcu_is_watching+0x15/0xd0 [ 171.823274][ T1599] ? do_raw_read_unlock+0x70/0x70 [ 171.823276][ T1599] ? lock_acquire+0x134/0x160 [ 171.823278][ T1599] _raw_spin_lock+0x33/0x40 [ 171.823280][ T1599] ? __ipv6_dev_ac_dec+0x236/0x5d0 [ 171.823281][ T1599] __ipv6_dev_ac_dec+0x236/0x5d0 [ 171.823283][ T1599] addrconf_leave_anycast+0x1bc/0x260 [ 171.823285][ T1599] ? find_held_lock+0x2b/0x80 [ 171.823288][ T1599] ? __ipv6_isatap_ifid+0x210/0x210 [ 171.823290][ T1599] ? mark_held_locks+0x40/0x70 [ 171.823291][ T1599] ? lockdep_hardirqs_on+0x8c/0x130 [ 171.823294][ T1599] dev_forward_change+0x3b3/0x850 [ 171.823296][ T1599] ? addrconf_fixup_forwarding+0x4d/0x4d0 [ 171.823298][ T1599] ? addrconf_sysctl_proxy_ndp+0x2f0/0x2f0 [ 171.823301][ T1599] addrconf_fixup_forwarding+0x2af/0x4d0 [ 171.823303][ T1599] addrconf_sysctl_forward+0x209/0x2b0 [ 171.823305][ T1599] ? addrconf_fixup_forwarding+0x4d0/0x4d0 [ 171.823308][ T1599] ? addrconf_fixup_forwarding+0x4d0/0x4d0 [ 171.823310][ T1599] ? __kvmalloc_node_noprof+0x305/0x8a0 [ 171.823313][ T1599] ? proc_sys_call_handler+0x25d/0x480 [ 171.823315][ T1599] proc_sys_call_handler+0x31b/0x480 [ 171.823317][ T1599] ? proc_sys_lookup+0x3d0/0x3d0 [ 171.823319][ T1599] ? rcu_read_unlock+0x1b/0x70 [ 171.823322][ T1599] ? do_raw_spin_unlock+0x59/0x250 [ 171.823323][ T1599] ? rcu_lockdep_current_cpu_online+0x39/0x1b0 [ 171.823326][ T1599] ? rcu_read_lock_any_held+0x3c/0x90 [ 171.823327][ T1599] ? proc_sys_call_handler+0x480/0x480 [ 171.823330][ T1599] new_sync_write+0x333/0x750 [ 171.823331][ T1599] ? __lock_acquire+0x508/0xc10 [ 171.823333][ T1599] ? new_sync_read+0x740/0x740 [ 171.823334][ T1599] ? lock_acquire.part.0+0xbc/0x260 [ 171.823336][ T1599] ? ksys_write+0x116/0x250 [ 171.823338][ T1599] vfs_write+0x6a4/0xc10 [ 171.823340][ T1599] ksys_write+0x116/0x250 [ 171.823341][ T1599] ? __ia32_sys_read+0xc0/0xc0 [ 171.823343][ T1599] ? rcu_is_watching+0x15/0xd0 [ 171.823344][ T1599] ? rcu_is_watching+0x15/0xd0 [ 171.823346][ T1599] do_syscall_64+0x117/0x590 [ 171.823348][ T1599] ? trace_hardirqs_off+0xd/0x30 [ 171.823351][ T1599] ? exc_page_fault+0xee/0x100 [ 171.823352][ T1599] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 171.823354][ T1599] RIP: 0033:0x7fd4f1e7a08e [ 171.823357][ T1599] Code: 4d 89 d8 e8 94 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 c3 83 e2 39 83 fa 08 75 e7 e8 03 ff ff ff 0f 1f 00 f3 0f 1e fa [ 171.823358][ T1599] RSP: 002b:00007ffd5a13a7a0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 171.823361][ T1599] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fd4f1e7a08e [ 171.823363][ T1599] RDX: 0000000000000002 RSI: 00005630366f44b0 RDI: 0000000000000005 [ 171.823364][ T1599] RBP: 00007ffd5a13a7b0 R08: 0000000000000000 R09: 0000000000000000 [ 171.823364][ T1599] R10: 0000000000000000 R11: 0000000000000202 R12: 00005630366f65e0 [ 171.823365][ T1599] R13: 00005630366f4470 R14: 0000000000000002 R15: 0000000000000000 [ 171.823368][ T1599]