[ 26.241288][ T644] 8021q: 802.1Q VLAN Support v1.8 [ 34.283067][ T726] [ 34.283156][ T726] ======================================================== [ 34.283280][ T726] WARNING: possible irq lock inversion dependency detected [ 34.283398][ T726] 7.1.0-rc5-virtme #1 Not tainted [ 34.283479][ T726] -------------------------------------------------------- [ 34.283595][ T726] sysctl/726 just changed the state of lock: [ 34.283697][ T726] ffffffff8cf7e8b8 (acaddr_hash_lock){+.+.}-{3:3}, at: __ipv6_dev_ac_dec+0x236/0x5d0 [ 34.283845][ T726] but this lock was taken by another, SOFTIRQ-safe lock in the past: [ 34.283973][ T726] (&ndev->lock){++--}-{3:3} [ 34.283975][ T726] [ 34.283975][ T726] [ 34.283975][ T726] and interrupts could create inverse lock ordering between them. [ 34.283975][ T726] [ 34.284260][ T726] [ 34.284260][ T726] other info that might help us debug this: [ 34.284375][ T726] Possible interrupt unsafe locking scenario: [ 34.284375][ T726] [ 34.284489][ T726] CPU0 CPU1 [ 34.284566][ T726] ---- ---- [ 34.284643][ T726] lock(acaddr_hash_lock); [ 34.284727][ T726] local_irq_disable(); [ 34.284823][ T726] lock(&ndev->lock); [ 34.284920][ T726] lock(acaddr_hash_lock); [ 34.285015][ T726] [ 34.285077][ T726] lock(&ndev->lock); [ 34.285138][ T726] [ 34.285138][ T726] *** DEADLOCK *** [ 34.285138][ T726] [ 34.285253][ T726] 2 locks held by sysctl/726: [ 34.285334][ T726] #0: ff11000009b043e0 (sb_writers#3){.+.+}-{0:0}, at: ksys_write+0x116/0x250 [ 34.285477][ T726] #1: ffffffff8ce8c9c0 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_fixup_forwarding+0x4d/0x4d0 [ 34.285634][ T726] [ 34.285634][ T726] the shortest dependencies between 2nd lock and 1st lock: [ 34.285782][ T726] -> (&ndev->lock){++--}-{3:3} { [ 34.285870][ T726] HARDIRQ-ON-W at: [ 34.285935][ T726] __lock_acquire+0x378/0xc10 [ 34.286038][ T726] lock_acquire.part.0+0xbc/0x260 [ 34.286135][ T726] _raw_write_lock_bh+0x38/0x50 [ 34.286236][ T726] addrconf_permanent_addr+0x108/0x9c0 [ 34.286353][ T726] addrconf_notify+0x151/0xf30 [ 34.286455][ T726] notifier_call_chain+0xb0/0x320 [ 34.286563][ T726] __dev_notify_flags+0xde/0x280 [ 34.286664][ T726] netif_change_flags+0xfe/0x190 [ 34.286768][ T726] do_setlink.isra.0+0x1cc3/0x2750 [ 34.286871][ T726] rtnl_newlink+0x8d1/0xef0 [ 34.286972][ T726] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 34.287069][ T726] netlink_rcv_skb+0x14e/0x3a0 [ 34.287167][ T726] netlink_unicast+0x486/0x750 [ 34.287265][ T726] netlink_sendmsg+0x735/0xc60 [ 34.287366][ T726] ____sys_sendmsg+0x419/0x850 [ 34.287465][ T726] ___sys_sendmsg+0x14e/0x1d0 [ 34.287565][ T726] __sys_sendmsg+0x145/0x1f0 [ 34.287664][ T726] do_syscall_64+0x117/0x590 [ 34.287770][ T726] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 34.287892][ T726] HARDIRQ-ON-R at: [ 34.287952][ T726] __lock_acquire+0x378/0xc10 [ 34.288050][ T726] lock_acquire.part.0+0xbc/0x260 [ 34.288189][ T726] _raw_read_lock_bh+0x44/0x80 [ 34.288292][ T726] inet6_fill_ifla6_attrs+0x1aee/0x21e0 [ 34.288414][ T726] inet6_fill_link_af+0x5c/0xe0 [ 34.288553][ T726] rtnl_fill_ifinfo.isra.0+0x1a45/0x2c20 [ 34.288677][ T726] rtnl_getlink+0x9c9/0xeb0 [ 34.288785][ T726] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 34.288923][ T726] netlink_rcv_skb+0x14e/0x3a0 [ 34.289017][ T726] netlink_unicast+0x486/0x750 [ 34.289112][ T726] netlink_sendmsg+0x735/0xc60 [ 34.289209][ T726] ____sys_sendmsg+0x419/0x850 [ 34.289349][ T726] ___sys_sendmsg+0x14e/0x1d0 [ 34.289446][ T726] __sys_sendmsg+0x145/0x1f0 [ 34.289542][ T726] do_syscall_64+0x117/0x590 [ 34.289687][ T726] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 34.289803][ T726] IN-SOFTIRQ-W at: [ 34.289870][ T726] __lock_acquire+0x378/0xc10 [ 34.290005][ T726] lock_acquire.part.0+0xbc/0x260 [ 34.290101][ T726] _raw_write_lock+0x33/0x40 [ 34.290195][ T726] addrconf_rs_timer+0xb0/0x770 [ 34.290332][ T726] call_timer_fn+0x163/0x4f0 [ 34.290430][ T726] __run_timers+0x68f/0xab0 [ 34.290527][ T726] run_timer_softirq+0xf0/0x160 [ 34.290624][ T726] handle_softirqs+0x1d8/0x940 [ 34.290765][ T726] __irq_exit_rcu+0x103/0x1c0 [ 34.290860][ T726] irq_exit_rcu+0xe/0x30 [ 34.290954][ T726] sysvec_apic_timer_interrupt+0x9d/0xe0 [ 34.291111][ T726] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 34.291233][ T726] pv_native_safe_halt+0xf/0x10 [ 34.291329][ T726] default_idle+0x9/0x10 [ 34.291465][ T726] default_idle_call+0x6e/0xb0 [ 34.291563][ T726] cpuidle_idle_call.constprop.0+0x237/0x410 [ 34.291679][ T726] do_idle+0xf5/0x160 [ 34.291817][ T726] cpu_startup_entry+0x53/0x70 [ 34.291913][ T726] rest_init+0x1f7/0x200 [ 34.292011][ T726] start_kernel+0x3ad/0x3b0 [ 34.292148][ T726] x86_64_start_reservations+0x24/0x30 [ 34.292264][ T726] x86_64_start_kernel+0x12b/0x130 [ 34.292359][ T726] common_startup_64+0x13e/0x148 [ 34.292497][ T726] IN-SOFTIRQ-R at: [ 34.292557][ T726] __lock_acquire+0x378/0xc10 [ 34.292652][ T726] lock_acquire.part.0+0xbc/0x260 [ 34.292790][ T726] _raw_read_lock_bh+0x44/0x80 [ 34.292884][ T726] ipv6_get_lladdr+0xa8/0x3f0 [ 34.292982][ T726] addrconf_rs_timer+0x251/0x770 [ 34.293078][ T726] call_timer_fn+0x163/0x4f0 [ 34.293212][ T726] __run_timers+0x68f/0xab0 [ 34.293309][ T726] run_timer_softirq+0xf0/0x160 [ 34.293406][ T726] handle_softirqs+0x1d8/0x940 [ 34.293542][ T726] __irq_exit_rcu+0x103/0x1c0 [ 34.293639][ T726] irq_exit_rcu+0xe/0x30 [ 34.293742][ T726] sysvec_apic_timer_interrupt+0x9d/0xe0 [ 34.293859][ T726] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 34.293980][ T726] pv_native_safe_halt+0xf/0x10 [ 34.294078][ T726] default_idle+0x9/0x10 [ 34.294179][ T726] default_idle_call+0x6e/0xb0 [ 34.294276][ T726] cpuidle_idle_call.constprop.0+0x237/0x410 [ 34.294392][ T726] do_idle+0xf5/0x160 [ 34.294496][ T726] cpu_startup_entry+0x53/0x70 [ 34.294592][ T726] rest_init+0x1f7/0x200 [ 34.294690][ T726] start_kernel+0x3ad/0x3b0 [ 34.294789][ T726] x86_64_start_reservations+0x24/0x30 [ 34.294904][ T726] x86_64_start_kernel+0x12b/0x130 [ 34.294999][ T726] common_startup_64+0x13e/0x148 [ 34.295142][ T726] INITIAL USE at: [ 34.295199][ T726] __lock_acquire+0x378/0xc10 [ 34.295298][ T726] lock_acquire.part.0+0xbc/0x260 [ 34.295393][ T726] _raw_write_lock_bh+0x38/0x50 [ 34.295527][ T726] addrconf_permanent_addr+0x108/0x9c0 [ 34.295641][ T726] addrconf_notify+0x151/0xf30 [ 34.295740][ T726] notifier_call_chain+0xb0/0x320 [ 34.295883][ T726] __dev_notify_flags+0xde/0x280 [ 34.295990][ T726] netif_change_flags+0xfe/0x190 [ 34.296085][ T726] do_setlink.isra.0+0x1cc3/0x2750 [ 34.296223][ T726] rtnl_newlink+0x8d1/0xef0 [ 34.296319][ T726] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 34.296417][ T726] netlink_rcv_skb+0x14e/0x3a0 [ 34.296556][ T726] netlink_unicast+0x486/0x750 [ 34.296654][ T726] netlink_sendmsg+0x735/0xc60 [ 34.296751][ T726] ____sys_sendmsg+0x419/0x850 [ 34.296890][ T726] ___sys_sendmsg+0x14e/0x1d0 [ 34.296987][ T726] __sys_sendmsg+0x145/0x1f0 [ 34.297089][ T726] do_syscall_64+0x117/0x590 [ 34.297231][ T726] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 34.297346][ T726] INITIAL READ USE at: [ 34.297422][ T726] __lock_acquire+0x378/0xc10 [ 34.297518][ T726] lock_acquire.part.0+0xbc/0x260 [ 34.297633][ T726] _raw_read_lock_bh+0x44/0x80 [ 34.297732][ T726] inet6_fill_ifla6_attrs+0x1aee/0x21e0 [ 34.297897][ T726] inet6_fill_link_af+0x5c/0xe0 [ 34.297998][ T726] rtnl_fill_ifinfo.isra.0+0x1a45/0x2c20 [ 34.298115][ T726] rtnl_getlink+0x9c9/0xeb0 [ 34.298253][ T726] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 34.298353][ T726] netlink_rcv_skb+0x14e/0x3a0 [ 34.298450][ T726] netlink_unicast+0x486/0x750 [ 34.298549][ T726] netlink_sendmsg+0x735/0xc60 [ 34.298690][ T726] ____sys_sendmsg+0x419/0x850 [ 34.298789][ T726] ___sys_sendmsg+0x14e/0x1d0 [ 34.298888][ T726] __sys_sendmsg+0x145/0x1f0 [ 34.299027][ T726] do_syscall_64+0x117/0x590 [ 34.299125][ T726] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 34.299242][ T726] } [ 34.299324][ T726] ... key at: [] __key.37+0x0/0x40 [ 34.299445][ T726] ... acquired at: [ 34.299506][ T726] __lock_acquire+0x508/0xc10 [ 34.299586][ T726] lock_acquire.part.0+0xbc/0x260 [ 34.299708][ T726] _raw_spin_lock+0x33/0x40 [ 34.299786][ T726] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 34.299883][ T726] __ipv6_dev_ac_inc+0x57e/0x930 [ 34.299965][ T726] addrconf_join_anycast+0x1bc/0x260 [ 34.300088][ T726] __ipv6_ifa_notify+0x75b/0xad0 [ 34.300165][ T726] addrconf_dad_completed+0x14b/0xe10 [ 34.300244][ T726] addrconf_dad_work+0x3c1/0x930 [ 34.300322][ T726] process_one_work+0xdf8/0x1410 [ 34.300441][ T726] worker_thread+0x4f1/0xd60 [ 34.300520][ T726] kthread+0x367/0x460 [ 34.300579][ T726] ret_from_fork+0x474/0x6b0 [ 34.300658][ T726] ret_from_fork_asm+0x11/0x20 [ 34.300781][ T726] [ 34.300821][ T726] -> (acaddr_hash_lock){+.+.}-{3:3} { [ 34.300900][ T726] HARDIRQ-ON-W at: [ 34.300959][ T726] __lock_acquire+0x378/0xc10 [ 34.301057][ T726] lock_acquire.part.0+0xbc/0x260 [ 34.301194][ T726] _raw_spin_lock+0x33/0x40 [ 34.301299][ T726] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 34.301414][ T726] __ipv6_dev_ac_inc+0x57e/0x930 [ 34.301550][ T726] addrconf_join_anycast+0x1bc/0x260 [ 34.301656][ T726] __ipv6_ifa_notify+0x75b/0xad0 [ 34.301757][ T726] addrconf_dad_completed+0x14b/0xe10 [ 34.301899][ T726] addrconf_dad_work+0x3c1/0x930 [ 34.302001][ T726] process_one_work+0xdf8/0x1410 [ 34.302098][ T726] worker_thread+0x4f1/0xd60 [ 34.302238][ T726] kthread+0x367/0x460 [ 34.302315][ T726] ret_from_fork+0x474/0x6b0 [ 34.302412][ T726] ret_from_fork_asm+0x11/0x20 [ 34.302551][ T726] SOFTIRQ-ON-W at: [ 34.302614][ T726] __lock_acquire+0x378/0xc10 [ 34.302713][ T726] lock_acquire.part.0+0xbc/0x260 [ 34.302810][ T726] _raw_spin_lock+0x33/0x40 [ 34.302948][ T726] __ipv6_dev_ac_dec+0x236/0x5d0 [ 34.303045][ T726] addrconf_leave_anycast+0x1bc/0x260 [ 34.303143][ T726] dev_forward_change+0x3b3/0x850 [ 34.303280][ T726] addrconf_fixup_forwarding+0x2af/0x4d0 [ 34.303395][ T726] addrconf_sysctl_forward+0x209/0x2b0 [ 34.303498][ T726] proc_sys_call_handler+0x31b/0x480 [ 34.303600][ T726] new_sync_write+0x333/0x750 [ 34.303703][ T726] vfs_write+0x6a4/0xc10 [ 34.303808][ T726] ksys_write+0x116/0x250 [ 34.303945][ T726] do_syscall_64+0x117/0x590 [ 34.304041][ T726] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 34.304157][ T726] INITIAL USE at: [ 34.304216][ T726] __lock_acquire+0x378/0xc10 [ 34.304357][ T726] lock_acquire.part.0+0xbc/0x260 [ 34.304452][ T726] _raw_spin_lock+0x33/0x40 [ 34.304553][ T726] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 34.304714][ T726] __ipv6_dev_ac_inc+0x57e/0x930 [ 34.304811][ T726] addrconf_join_anycast+0x1bc/0x260 [ 34.304908][ T726] __ipv6_ifa_notify+0x75b/0xad0 [ 34.305049][ T726] addrconf_dad_completed+0x14b/0xe10 [ 34.305146][ T726] addrconf_dad_work+0x3c1/0x930 [ 34.305245][ T726] process_one_work+0xdf8/0x1410 [ 34.305384][ T726] worker_thread+0x4f1/0xd60 [ 34.305482][ T726] kthread+0x367/0x460 [ 34.305561][ T726] ret_from_fork+0x474/0x6b0 [ 34.305656][ T726] ret_from_fork_asm+0x11/0x20 [ 34.305797][ T726] } [ 34.305840][ T726] ... key at: [] acaddr_hash_lock+0x18/0x45a0 [ 34.305957][ T726] ... acquired at: [ 34.306014][ T726] mark_lock+0x1d7/0xa00 [ 34.306135][ T726] mark_usage+0x105/0x170 [ 34.306213][ T726] __lock_acquire+0x378/0xc10 [ 34.306295][ T726] lock_acquire.part.0+0xbc/0x260 [ 34.306376][ T726] _raw_spin_lock+0x33/0x40 [ 34.306492][ T726] __ipv6_dev_ac_dec+0x236/0x5d0 [ 34.306570][ T726] addrconf_leave_anycast+0x1bc/0x260 [ 34.306647][ T726] dev_forward_change+0x3b3/0x850 [ 34.306729][ T726] addrconf_fixup_forwarding+0x2af/0x4d0 [ 34.306866][ T726] addrconf_sysctl_forward+0x209/0x2b0 [ 34.306944][ T726] proc_sys_call_handler+0x31b/0x480 [ 34.307021][ T726] new_sync_write+0x333/0x750 [ 34.307138][ T726] vfs_write+0x6a4/0xc10 [ 34.307219][ T726] ksys_write+0x116/0x250 [ 34.307297][ T726] do_syscall_64+0x117/0x590 [ 34.307375][ T726] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 34.307510][ T726] [ 34.307549][ T726] [ 34.307549][ T726] stack backtrace: [ 34.307646][ T726] CPU: 0 UID: 0 PID: 726 Comm: sysctl Not tainted 7.1.0-rc5-virtme #1 PREEMPT(full) [ 34.307649][ T726] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 34.307651][ T726] Call Trace: [ 34.307652][ T726] [ 34.307654][ T726] dump_stack_lvl+0x6f/0xa0 [ 34.307658][ T726] print_irq_inversion_bug.part.0.cold+0xe6/0x143 [ 34.307661][ T726] mark_lock_irq+0x989/0x9c0 [ 34.307663][ T726] mark_lock+0x1d7/0xa00 [ 34.307665][ T726] mark_usage+0x105/0x170 [ 34.307666][ T726] __lock_acquire+0x378/0xc10 [ 34.307668][ T726] lock_acquire.part.0+0xbc/0x260 [ 34.307670][ T726] ? __ipv6_dev_ac_dec+0x236/0x5d0 [ 34.307671][ T726] ? rcu_is_watching+0x15/0xd0 [ 34.307674][ T726] ? do_raw_read_unlock+0x70/0x70 [ 34.307676][ T726] ? lock_acquire+0x134/0x160 [ 34.307678][ T726] _raw_spin_lock+0x33/0x40 [ 34.307680][ T726] ? __ipv6_dev_ac_dec+0x236/0x5d0 [ 34.307681][ T726] __ipv6_dev_ac_dec+0x236/0x5d0 [ 34.307687][ T726] addrconf_leave_anycast+0x1bc/0x260 [ 34.307688][ T726] ? find_held_lock+0x2b/0x80 [ 34.307691][ T726] ? __ipv6_isatap_ifid+0x210/0x210 [ 34.307693][ T726] ? mark_held_locks+0x40/0x70 [ 34.307695][ T726] ? lockdep_hardirqs_on+0x8c/0x130 [ 34.307697][ T726] dev_forward_change+0x3b3/0x850 [ 34.307699][ T726] ? addrconf_fixup_forwarding+0x4d/0x4d0 [ 34.307700][ T726] ? addrconf_sysctl_proxy_ndp+0x2f0/0x2f0 [ 34.307703][ T726] addrconf_fixup_forwarding+0x2af/0x4d0 [ 34.307705][ T726] addrconf_sysctl_forward+0x209/0x2b0 [ 34.307707][ T726] ? addrconf_fixup_forwarding+0x4d0/0x4d0 [ 34.307710][ T726] ? addrconf_fixup_forwarding+0x4d0/0x4d0 [ 34.307712][ T726] ? __kvmalloc_node_noprof+0x305/0x8a0 [ 34.307714][ T726] ? proc_sys_call_handler+0x25d/0x480 [ 34.307717][ T726] proc_sys_call_handler+0x31b/0x480 [ 34.307719][ T726] ? proc_sys_lookup+0x3d0/0x3d0 [ 34.307721][ T726] ? rcu_read_unlock+0x1b/0x70 [ 34.307723][ T726] ? do_raw_spin_unlock+0x59/0x250 [ 34.307725][ T726] ? rcu_lockdep_current_cpu_online+0x39/0x1b0 [ 34.307727][ T726] ? rcu_read_lock_any_held+0x3c/0x90 [ 34.307729][ T726] ? proc_sys_call_handler+0x480/0x480 [ 34.307731][ T726] new_sync_write+0x333/0x750 [ 34.307732][ T726] ? __lock_acquire+0x508/0xc10 [ 34.307733][ T726] ? new_sync_read+0x740/0x740 [ 34.307735][ T726] ? lock_acquire.part.0+0xbc/0x260 [ 34.307736][ T726] ? ksys_write+0x116/0x250 [ 34.307738][ T726] vfs_write+0x6a4/0xc10 [ 34.307740][ T726] ksys_write+0x116/0x250 [ 34.307742][ T726] ? __ia32_sys_read+0xc0/0xc0 [ 34.307743][ T726] ? rcu_is_watching+0x15/0xd0 [ 34.307744][ T726] ? rcu_is_watching+0x15/0xd0 [ 34.307746][ T726] do_syscall_64+0x117/0x590 [ 34.307748][ T726] ? trace_hardirqs_off+0xd/0x30 [ 34.307750][ T726] ? exc_page_fault+0xee/0x100 [ 34.307752][ T726] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 34.307754][ T726] RIP: 0033:0x7fbb0fbb708e [ 34.307756][ T726] 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 [ 34.307758][ T726] RSP: 002b:00007ffecf723e90 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 34.307761][ T726] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fbb0fbb708e [ 34.307762][ T726] RDX: 0000000000000002 RSI: 0000559104a824b0 RDI: 0000000000000005 [ 34.307763][ T726] RBP: 00007ffecf723ea0 R08: 0000000000000000 R09: 0000000000000000 [ 34.307764][ T726] R10: 0000000000000000 R11: 0000000000000202 R12: 0000559104a845e0 [ 34.307765][ T726] R13: 0000559104a82470 R14: 0000000000000002 R15: 0000000000000000 [ 34.307767][ T726]