[ 9.003109][ T211] 8021q: 802.1Q VLAN Support v1.8 [ 17.034409][ T294] [ 17.034497][ T294] ======================================================== [ 17.034630][ T294] WARNING: possible irq lock inversion dependency detected [ 17.034753][ T294] 7.1.0-rc5-virtme #1 Not tainted [ 17.034840][ T294] -------------------------------------------------------- [ 17.034965][ T294] sysctl/294 just changed the state of lock: [ 17.035075][ T294] ffffffff9617e8b8 (acaddr_hash_lock){+.+.}-{3:3}, at: __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.035234][ T294] but this lock was taken by another, SOFTIRQ-READ-safe lock in the past: [ 17.035369][ T294] (&ndev->lock){++.-}-{3:3} [ 17.035371][ T294] [ 17.035371][ T294] [ 17.035371][ T294] and interrupts could create inverse lock ordering between them. [ 17.035371][ T294] [ 17.035684][ T294] [ 17.035684][ T294] other info that might help us debug this: [ 17.035808][ T294] Possible interrupt unsafe locking scenario: [ 17.035808][ T294] [ 17.035935][ T294] CPU0 CPU1 [ 17.036023][ T294] ---- ---- [ 17.036111][ T294] lock(acaddr_hash_lock); [ 17.036197][ T294] local_irq_disable(); [ 17.036313][ T294] lock(&ndev->lock); [ 17.036419][ T294] lock(acaddr_hash_lock); [ 17.036526][ T294] [ 17.036591][ T294] lock(&ndev->lock); [ 17.036658][ T294] [ 17.036658][ T294] *** DEADLOCK *** [ 17.036658][ T294] [ 17.036780][ T294] 2 locks held by sysctl/294: [ 17.036867][ T294] #0: ff11000009cfc3e0 (sb_writers#3){.+.+}-{0:0}, at: ksys_write+0x116/0x250 [ 17.037018][ T294] #1: ffffffff9608c9c0 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_fixup_forwarding+0x4d/0x4d0 [ 17.037196][ T294] [ 17.037196][ T294] the shortest dependencies between 2nd lock and 1st lock: [ 17.037346][ T294] -> (&ndev->lock){++.-}-{3:3} { [ 17.037439][ T294] HARDIRQ-ON-W at: [ 17.037506][ T294] __lock_acquire+0x378/0xc10 [ 17.037619][ T294] lock_acquire.part.0+0xbc/0x260 [ 17.037725][ T294] _raw_write_lock_bh+0x38/0x50 [ 17.037832][ T294] addrconf_permanent_addr+0x108/0x9c0 [ 17.037961][ T294] addrconf_notify+0x151/0xf30 [ 17.038078][ T294] notifier_call_chain+0xb0/0x320 [ 17.038189][ T294] __dev_notify_flags+0xde/0x280 [ 17.038301][ T294] netif_change_flags+0xfe/0x190 [ 17.038413][ T294] do_setlink.isra.0+0x1cc3/0x2750 [ 17.038520][ T294] rtnl_newlink+0x8d1/0xef0 [ 17.038630][ T294] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 17.038738][ T294] netlink_rcv_skb+0x14e/0x3a0 [ 17.038851][ T294] netlink_unicast+0x486/0x750 [ 17.038961][ T294] netlink_sendmsg+0x735/0xc60 [ 17.039074][ T294] ____sys_sendmsg+0x419/0x850 [ 17.039184][ T294] ___sys_sendmsg+0x14e/0x1d0 [ 17.039294][ T294] __sys_sendmsg+0x145/0x1f0 [ 17.039404][ T294] do_syscall_64+0x117/0x590 [ 17.039514][ T294] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.039648][ T294] HARDIRQ-ON-R at: [ 17.039718][ T294] __lock_acquire+0x378/0xc10 [ 17.039818][ T294] lock_acquire.part.0+0xbc/0x260 [ 17.039919][ T294] _raw_read_lock_bh+0x44/0x80 [ 17.040021][ T294] inet6_fill_ifla6_attrs+0x1aee/0x21e0 [ 17.040145][ T294] inet6_fill_link_af+0x5c/0xe0 [ 17.040246][ T294] rtnl_fill_ifinfo.isra.0+0x1a45/0x2c20 [ 17.040366][ T294] rtnl_getlink+0x9c9/0xeb0 [ 17.040481][ T294] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 17.040581][ T294] netlink_rcv_skb+0x14e/0x3a0 [ 17.040683][ T294] netlink_unicast+0x486/0x750 [ 17.040785][ T294] netlink_sendmsg+0x735/0xc60 [ 17.040887][ T294] ____sys_sendmsg+0x419/0x850 [ 17.040991][ T294] ___sys_sendmsg+0x14e/0x1d0 [ 17.041105][ T294] __sys_sendmsg+0x145/0x1f0 [ 17.041205][ T294] do_syscall_64+0x117/0x590 [ 17.041305][ T294] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.041423][ T294] IN-SOFTIRQ-R at: [ 17.041488][ T294] __lock_acquire+0x378/0xc10 [ 17.041589][ T294] lock_acquire.part.0+0xbc/0x260 [ 17.041689][ T294] _raw_read_lock_bh+0x44/0x80 [ 17.041792][ T294] ipv6_get_lladdr+0xa8/0x3f0 [ 17.041892][ T294] ndisc_send_ns+0xf3/0x120 [ 17.041992][ T294] ndisc_solicit+0x314/0x480 [ 17.042097][ T294] neigh_probe+0xb3/0x100 [ 17.042198][ T294] __neigh_event_send+0x802/0x1070 [ 17.042302][ T294] neigh_resolve_output+0xbe/0x140 [ 17.042408][ T294] ip6_finish_output2+0x423/0x1300 [ 17.042516][ T294] ip6_finish_output+0x646/0xda0 [ 17.042614][ T294] ip6_output+0x23f/0x7f0 [ 17.042723][ T294] ip6_forward+0x10f4/0x2bd0 [ 17.042824][ T294] ipv6_rcv+0x3c1/0x5a0 [ 17.042928][ T294] __netif_receive_skb_one_core+0xfc/0x180 [ 17.043048][ T294] process_backlog+0x2bc/0x1490 [ 17.043150][ T294] __napi_poll+0xa7/0x3b0 [ 17.043248][ T294] net_rx_action+0x513/0xf50 [ 17.043348][ T294] handle_softirqs+0x1d8/0x940 [ 17.043447][ T294] do_softirq+0xa9/0xe0 [ 17.043549][ T294] __local_bh_enable_ip+0x113/0x140 [ 17.043650][ T294] __neigh_event_send+0x30a/0x1070 [ 17.043750][ T294] neigh_resolve_output+0xbe/0x140 [ 17.043852][ T294] ip6_finish_output2+0x423/0x1300 [ 17.043957][ T294] ip6_finish_output+0x646/0xda0 [ 17.044059][ T294] ip6_output+0x23f/0x7f0 [ 17.044207][ T294] ip6_send_skb+0xee/0x350 [ 17.044308][ T294] rawv6_push_pending_frames+0x4cb/0xa90 [ 17.044427][ T294] rawv6_sendmsg+0x1434/0x1a50 [ 17.044568][ T294] __sys_sendto+0x2c9/0x400 [ 17.044667][ T294] __x64_sys_sendto+0xe4/0x1f0 [ 17.044767][ T294] do_syscall_64+0x117/0x590 [ 17.044911][ T294] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.045030][ T294] INITIAL USE at: [ 17.045094][ T294] __lock_acquire+0x378/0xc10 [ 17.045244][ T294] lock_acquire.part.0+0xbc/0x260 [ 17.045343][ T294] _raw_write_lock_bh+0x38/0x50 [ 17.045448][ T294] addrconf_permanent_addr+0x108/0x9c0 [ 17.045609][ T294] addrconf_notify+0x151/0xf30 [ 17.045709][ T294] notifier_call_chain+0xb0/0x320 [ 17.045810][ T294] __dev_notify_flags+0xde/0x280 [ 17.045908][ T294] netif_change_flags+0xfe/0x190 [ 17.046052][ T294] do_setlink.isra.0+0x1cc3/0x2750 [ 17.046160][ T294] rtnl_newlink+0x8d1/0xef0 [ 17.046260][ T294] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 17.046411][ T294] netlink_rcv_skb+0x14e/0x3a0 [ 17.046511][ T294] netlink_unicast+0x486/0x750 [ 17.046612][ T294] netlink_sendmsg+0x735/0xc60 [ 17.046760][ T294] ____sys_sendmsg+0x419/0x850 [ 17.046860][ T294] ___sys_sendmsg+0x14e/0x1d0 [ 17.046960][ T294] __sys_sendmsg+0x145/0x1f0 [ 17.047114][ T294] do_syscall_64+0x117/0x590 [ 17.047219][ T294] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.047341][ T294] INITIAL READ USE at: [ 17.047463][ T294] __lock_acquire+0x378/0xc10 [ 17.047562][ T294] lock_acquire.part.0+0xbc/0x260 [ 17.047689][ T294] _raw_read_lock_bh+0x44/0x80 [ 17.047831][ T294] inet6_fill_ifla6_attrs+0x1aee/0x21e0 [ 17.047958][ T294] inet6_fill_link_af+0x5c/0xe0 [ 17.048057][ T294] rtnl_fill_ifinfo.isra.0+0x1a45/0x2c20 [ 17.048227][ T294] rtnl_getlink+0x9c9/0xeb0 [ 17.048327][ T294] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 17.048428][ T294] netlink_rcv_skb+0x14e/0x3a0 [ 17.048571][ T294] netlink_unicast+0x486/0x750 [ 17.048670][ T294] netlink_sendmsg+0x735/0xc60 [ 17.048774][ T294] ____sys_sendmsg+0x419/0x850 [ 17.048873][ T294] ___sys_sendmsg+0x14e/0x1d0 [ 17.048972][ T294] __sys_sendmsg+0x145/0x1f0 [ 17.049079][ T294] do_syscall_64+0x117/0x590 [ 17.049178][ T294] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.049346][ T294] } [ 17.049392][ T294] ... key at: [] __key.37+0x0/0x40 [ 17.049514][ T294] ... acquired at: [ 17.049574][ T294] __lock_acquire+0x508/0xc10 [ 17.049699][ T294] lock_acquire.part.0+0xbc/0x260 [ 17.049786][ T294] _raw_spin_lock+0x33/0x40 [ 17.049867][ T294] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 17.050009][ T294] __ipv6_dev_ac_inc+0x57e/0x930 [ 17.050092][ T294] addrconf_join_anycast+0x1bc/0x260 [ 17.050171][ T294] __ipv6_ifa_notify+0x75b/0xad0 [ 17.050253][ T294] addrconf_dad_completed+0x14b/0xe10 [ 17.050374][ T294] addrconf_dad_work+0x3c1/0x930 [ 17.050453][ T294] process_one_work+0xdf8/0x1410 [ 17.050533][ T294] worker_thread+0x4f1/0xd60 [ 17.050613][ T294] kthread+0x367/0x460 [ 17.050673][ T294] ret_from_fork+0x474/0x6b0 [ 17.050798][ T294] ret_from_fork_asm+0x11/0x20 [ 17.050878][ T294] [ 17.050921][ T294] -> (acaddr_hash_lock){+.+.}-{3:3} { [ 17.051001][ T294] HARDIRQ-ON-W at: [ 17.051105][ T294] __lock_acquire+0x378/0xc10 [ 17.051207][ T294] lock_acquire.part.0+0xbc/0x260 [ 17.051315][ T294] _raw_spin_lock+0x33/0x40 [ 17.051414][ T294] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 17.051576][ T294] __ipv6_dev_ac_inc+0x57e/0x930 [ 17.051684][ T294] addrconf_join_anycast+0x1bc/0x260 [ 17.051784][ T294] __ipv6_ifa_notify+0x75b/0xad0 [ 17.051926][ T294] addrconf_dad_completed+0x14b/0xe10 [ 17.052027][ T294] addrconf_dad_work+0x3c1/0x930 [ 17.052132][ T294] process_one_work+0xdf8/0x1410 [ 17.052277][ T294] worker_thread+0x4f1/0xd60 [ 17.052378][ T294] kthread+0x367/0x460 [ 17.052458][ T294] ret_from_fork+0x474/0x6b0 [ 17.052601][ T294] ret_from_fork_asm+0x11/0x20 [ 17.052701][ T294] SOFTIRQ-ON-W at: [ 17.052763][ T294] __lock_acquire+0x378/0xc10 [ 17.052862][ T294] lock_acquire.part.0+0xbc/0x260 [ 17.053005][ T294] _raw_spin_lock+0x33/0x40 [ 17.053110][ T294] __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.053209][ T294] addrconf_leave_anycast+0x1bc/0x260 [ 17.053356][ T294] dev_forward_change+0x3b3/0x850 [ 17.053466][ T294] addrconf_fixup_forwarding+0x2af/0x4d0 [ 17.053585][ T294] addrconf_sysctl_forward+0x209/0x2b0 [ 17.053728][ T294] proc_sys_call_handler+0x31b/0x480 [ 17.053829][ T294] new_sync_write+0x333/0x750 [ 17.053929][ T294] vfs_write+0x6a4/0xc10 [ 17.054082][ T294] ksys_write+0x116/0x250 [ 17.054187][ T294] do_syscall_64+0x117/0x590 [ 17.054286][ T294] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.054448][ T294] INITIAL USE at: [ 17.054509][ T294] __lock_acquire+0x378/0xc10 [ 17.054609][ T294] lock_acquire.part.0+0xbc/0x260 [ 17.054710][ T294] _raw_spin_lock+0x33/0x40 [ 17.054854][ T294] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 17.054976][ T294] __ipv6_dev_ac_inc+0x57e/0x930 [ 17.055080][ T294] addrconf_join_anycast+0x1bc/0x260 [ 17.055224][ T294] __ipv6_ifa_notify+0x75b/0xad0 [ 17.055325][ T294] addrconf_dad_completed+0x14b/0xe10 [ 17.055426][ T294] addrconf_dad_work+0x3c1/0x930 [ 17.055573][ T294] process_one_work+0xdf8/0x1410 [ 17.055674][ T294] worker_thread+0x4f1/0xd60 [ 17.055774][ T294] kthread+0x367/0x460 [ 17.055897][ T294] ret_from_fork+0x474/0x6b0 [ 17.056001][ T294] ret_from_fork_asm+0x11/0x20 [ 17.056104][ T294] } [ 17.056145][ T294] ... key at: [] acaddr_hash_lock+0x18/0x45a0 [ 17.056305][ T294] ... acquired at: [ 17.056364][ T294] mark_lock+0x1d7/0xa00 [ 17.056453][ T294] mark_usage+0x105/0x170 [ 17.056532][ T294] __lock_acquire+0x378/0xc10 [ 17.056657][ T294] lock_acquire.part.0+0xbc/0x260 [ 17.056736][ T294] _raw_spin_lock+0x33/0x40 [ 17.056816][ T294] __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.056895][ T294] addrconf_leave_anycast+0x1bc/0x260 [ 17.057020][ T294] dev_forward_change+0x3b3/0x850 [ 17.057106][ T294] addrconf_fixup_forwarding+0x2af/0x4d0 [ 17.057205][ T294] addrconf_sysctl_forward+0x209/0x2b0 [ 17.057286][ T294] proc_sys_call_handler+0x31b/0x480 [ 17.057407][ T294] new_sync_write+0x333/0x750 [ 17.057486][ T294] vfs_write+0x6a4/0xc10 [ 17.057566][ T294] ksys_write+0x116/0x250 [ 17.057646][ T294] do_syscall_64+0x117/0x590 [ 17.057769][ T294] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.057868][ T294] [ 17.057909][ T294] [ 17.057909][ T294] stack backtrace: [ 17.058009][ T294] CPU: 0 UID: 0 PID: 294 Comm: sysctl Not tainted 7.1.0-rc5-virtme #1 PREEMPT(full) [ 17.058012][ T294] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 17.058013][ T294] Call Trace: [ 17.058015][ T294] [ 17.058016][ T294] dump_stack_lvl+0x6f/0xa0 [ 17.058020][ T294] print_irq_inversion_bug.part.0.cold+0xe6/0x143 [ 17.058023][ T294] mark_lock_irq+0x989/0x9c0 [ 17.058026][ T294] mark_lock+0x1d7/0xa00 [ 17.058028][ T294] mark_usage+0x105/0x170 [ 17.058029][ T294] __lock_acquire+0x378/0xc10 [ 17.058031][ T294] lock_acquire.part.0+0xbc/0x260 [ 17.058033][ T294] ? __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.058034][ T294] ? rcu_is_watching+0x15/0xd0 [ 17.058037][ T294] ? do_raw_read_unlock+0x70/0x70 [ 17.058039][ T294] ? lock_acquire+0x134/0x160 [ 17.058041][ T294] _raw_spin_lock+0x33/0x40 [ 17.058043][ T294] ? __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.058044][ T294] __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.058046][ T294] addrconf_leave_anycast+0x1bc/0x260 [ 17.058048][ T294] ? find_held_lock+0x2b/0x80 [ 17.058051][ T294] ? __ipv6_isatap_ifid+0x210/0x210 [ 17.058053][ T294] ? mark_held_locks+0x40/0x70 [ 17.058054][ T294] ? lockdep_hardirqs_on+0x8c/0x130 [ 17.058057][ T294] dev_forward_change+0x3b3/0x850 [ 17.058059][ T294] ? addrconf_fixup_forwarding+0x4d/0x4d0 [ 17.058065][ T294] ? addrconf_sysctl_proxy_ndp+0x2f0/0x2f0 [ 17.058068][ T294] addrconf_fixup_forwarding+0x2af/0x4d0 [ 17.058071][ T294] addrconf_sysctl_forward+0x209/0x2b0 [ 17.058073][ T294] ? addrconf_fixup_forwarding+0x4d0/0x4d0 [ 17.058075][ T294] ? addrconf_fixup_forwarding+0x4d0/0x4d0 [ 17.058077][ T294] ? __kvmalloc_node_noprof+0x305/0x8a0 [ 17.058080][ T294] ? proc_sys_call_handler+0x25d/0x480 [ 17.058083][ T294] proc_sys_call_handler+0x31b/0x480 [ 17.058085][ T294] ? proc_sys_lookup+0x3d0/0x3d0 [ 17.058087][ T294] ? rcu_read_unlock+0x1b/0x70 [ 17.058090][ T294] ? do_raw_spin_unlock+0x59/0x250 [ 17.058091][ T294] ? rcu_lockdep_current_cpu_online+0x39/0x1b0 [ 17.058093][ T294] ? rcu_read_lock_any_held+0x3c/0x90 [ 17.058095][ T294] ? proc_sys_call_handler+0x480/0x480 [ 17.058097][ T294] new_sync_write+0x333/0x750 [ 17.058099][ T294] ? __lock_acquire+0x508/0xc10 [ 17.058100][ T294] ? new_sync_read+0x740/0x740 [ 17.058102][ T294] ? lock_acquire.part.0+0xbc/0x260 [ 17.058103][ T294] ? ksys_write+0x116/0x250 [ 17.058106][ T294] vfs_write+0x6a4/0xc10 [ 17.058107][ T294] ksys_write+0x116/0x250 [ 17.058109][ T294] ? __ia32_sys_read+0xc0/0xc0 [ 17.058110][ T294] ? rcu_is_watching+0x15/0xd0 [ 17.058112][ T294] ? rcu_is_watching+0x15/0xd0 [ 17.058114][ T294] do_syscall_64+0x117/0x590 [ 17.058115][ T294] ? trace_hardirqs_off+0xd/0x30 [ 17.058118][ T294] ? exc_page_fault+0xee/0x100 [ 17.058120][ T294] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.058122][ T294] RIP: 0033:0x7fb3608ac08e [ 17.058124][ T294] 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 [ 17.058126][ T294] RSP: 002b:00007ffd4f5952f0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 17.058129][ T294] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fb3608ac08e [ 17.058130][ T294] RDX: 0000000000000002 RSI: 00005647a111c4b0 RDI: 0000000000000005 [ 17.058131][ T294] RBP: 00007ffd4f595300 R08: 0000000000000000 R09: 0000000000000000 [ 17.058132][ T294] R10: 0000000000000000 R11: 0000000000000202 R12: 00005647a111e5e0 [ 17.058133][ T294] R13: 00005647a111c470 R14: 0000000000000002 R15: 0000000000000000 [ 17.058135][ T294]