[ 8.926459][ T185] ip (185) used greatest stack depth: 23776 bytes left [ 9.660387][ T223] 8021q: 802.1Q VLAN Support v1.8 [ 17.747388][ T304] [ 17.747473][ T304] ======================================================== [ 17.747591][ T304] WARNING: possible irq lock inversion dependency detected [ 17.747712][ T304] 7.1.0-rc5-virtme #1 Not tainted [ 17.747792][ T304] -------------------------------------------------------- [ 17.747901][ T304] sysctl/304 just changed the state of lock: [ 17.747997][ T304] ffffffff9737e8b8 (acaddr_hash_lock){+.+.}-{3:3}, at: __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.748142][ T304] but this lock was taken by another, SOFTIRQ-READ-safe lock in the past: [ 17.748260][ T304] (&ndev->lock){++.-}-{3:3} [ 17.748262][ T304] [ 17.748262][ T304] [ 17.748262][ T304] and interrupts could create inverse lock ordering between them. [ 17.748262][ T304] [ 17.748544][ T304] [ 17.748544][ T304] other info that might help us debug this: [ 17.748664][ T304] Possible interrupt unsafe locking scenario: [ 17.748664][ T304] [ 17.748778][ T304] CPU0 CPU1 [ 17.748855][ T304] ---- ---- [ 17.748935][ T304] lock(acaddr_hash_lock); [ 17.749014][ T304] local_irq_disable(); [ 17.749113][ T304] lock(&ndev->lock); [ 17.749211][ T304] lock(acaddr_hash_lock); [ 17.749309][ T304] [ 17.749368][ T304] lock(&ndev->lock); [ 17.749428][ T304] [ 17.749428][ T304] *** DEADLOCK *** [ 17.749428][ T304] [ 17.749543][ T304] 2 locks held by sysctl/304: [ 17.749621][ T304] #0: ff11000009a943e0 (sb_writers#3){.+.+}-{0:0}, at: ksys_write+0x116/0x250 [ 17.749765][ T304] #1: ffffffff9728c9c0 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_fixup_forwarding+0x4d/0x4d0 [ 17.749924][ T304] [ 17.749924][ T304] the shortest dependencies between 2nd lock and 1st lock: [ 17.750063][ T304] -> (&ndev->lock){++.-}-{3:3} { [ 17.750146][ T304] HARDIRQ-ON-W at: [ 17.750206][ T304] __lock_acquire+0x378/0xc10 [ 17.750309][ T304] lock_acquire.part.0+0xbc/0x260 [ 17.750407][ T304] _raw_write_lock_bh+0x38/0x50 [ 17.750507][ T304] addrconf_permanent_addr+0x108/0x9c0 [ 17.750625][ T304] addrconf_notify+0x151/0xf30 [ 17.750725][ T304] notifier_call_chain+0xb0/0x320 [ 17.750825][ T304] __dev_notify_flags+0xde/0x280 [ 17.750925][ T304] netif_change_flags+0xfe/0x190 [ 17.751021][ T304] do_setlink.isra.0+0x1cc3/0x2750 [ 17.751120][ T304] rtnl_newlink+0x8d1/0xef0 [ 17.751218][ T304] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 17.751315][ T304] netlink_rcv_skb+0x14e/0x3a0 [ 17.751420][ T304] netlink_unicast+0x486/0x750 [ 17.751518][ T304] netlink_sendmsg+0x735/0xc60 [ 17.751614][ T304] ____sys_sendmsg+0x419/0x850 [ 17.751718][ T304] ___sys_sendmsg+0x14e/0x1d0 [ 17.751815][ T304] __sys_sendmsg+0x145/0x1f0 [ 17.751911][ T304] do_syscall_64+0x117/0x590 [ 17.752007][ T304] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.752125][ T304] HARDIRQ-ON-R at: [ 17.752185][ T304] __lock_acquire+0x378/0xc10 [ 17.752283][ T304] lock_acquire.part.0+0xbc/0x260 [ 17.752379][ T304] _raw_read_lock_bh+0x44/0x80 [ 17.752474][ T304] inet6_fill_ifla6_attrs+0x1aee/0x21e0 [ 17.752588][ T304] inet6_fill_link_af+0x5c/0xe0 [ 17.752691][ T304] rtnl_fill_ifinfo.isra.0+0x1a45/0x2c20 [ 17.752807][ T304] rtnl_getlink+0x9c9/0xeb0 [ 17.752904][ T304] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 17.753000][ T304] netlink_rcv_skb+0x14e/0x3a0 [ 17.753098][ T304] netlink_unicast+0x486/0x750 [ 17.753195][ T304] netlink_sendmsg+0x735/0xc60 [ 17.753292][ T304] ____sys_sendmsg+0x419/0x850 [ 17.753389][ T304] ___sys_sendmsg+0x14e/0x1d0 [ 17.753491][ T304] __sys_sendmsg+0x145/0x1f0 [ 17.753587][ T304] do_syscall_64+0x117/0x590 [ 17.753688][ T304] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.753802][ T304] IN-SOFTIRQ-R at: [ 17.753859][ T304] __lock_acquire+0x378/0xc10 [ 17.753954][ T304] lock_acquire.part.0+0xbc/0x260 [ 17.754093][ T304] _raw_read_lock_bh+0x44/0x80 [ 17.754189][ T304] ipv6_get_lladdr+0xa8/0x3f0 [ 17.754286][ T304] ndisc_send_ns+0xf3/0x120 [ 17.754424][ T304] ndisc_solicit+0x314/0x480 [ 17.754520][ T304] neigh_probe+0xb3/0x100 [ 17.754618][ T304] __neigh_event_send+0x802/0x1070 [ 17.754761][ T304] neigh_resolve_output+0xbe/0x140 [ 17.754856][ T304] ip6_finish_output2+0x423/0x1300 [ 17.754949][ T304] ip6_finish_output+0x646/0xda0 [ 17.755084][ T304] ip6_output+0x23f/0x7f0 [ 17.755180][ T304] ip6_forward+0x10f4/0x2bd0 [ 17.755277][ T304] ipv6_rcv+0x3c1/0x5a0 [ 17.755415][ T304] __netif_receive_skb_one_core+0xfc/0x180 [ 17.755532][ T304] process_backlog+0x2bc/0x1490 [ 17.755628][ T304] __napi_poll+0xa7/0x3b0 [ 17.755765][ T304] net_rx_action+0x513/0xf50 [ 17.755862][ T304] handle_softirqs+0x1d8/0x940 [ 17.755958][ T304] do_softirq+0xa9/0xe0 [ 17.756053][ T304] __local_bh_enable_ip+0x113/0x140 [ 17.756190][ T304] __neigh_event_send+0x30a/0x1070 [ 17.756287][ T304] neigh_resolve_output+0xbe/0x140 [ 17.756383][ T304] ip6_finish_output2+0x423/0x1300 [ 17.756522][ T304] ip6_finish_output+0x646/0xda0 [ 17.756615][ T304] ip6_output+0x23f/0x7f0 [ 17.756713][ T304] ip6_send_skb+0xee/0x350 [ 17.756809][ T304] rawv6_push_pending_frames+0x4cb/0xa90 [ 17.756924][ T304] rawv6_sendmsg+0x1434/0x1a50 [ 17.757022][ T304] __sys_sendto+0x2c9/0x400 [ 17.757161][ T304] __x64_sys_sendto+0xe4/0x1f0 [ 17.757256][ T304] do_syscall_64+0x117/0x590 [ 17.757353][ T304] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.757509][ T304] INITIAL USE at: [ 17.757566][ T304] __lock_acquire+0x378/0xc10 [ 17.757666][ T304] lock_acquire.part.0+0xbc/0x260 [ 17.757762][ T304] _raw_write_lock_bh+0x38/0x50 [ 17.757858][ T304] addrconf_permanent_addr+0x108/0x9c0 [ 17.757971][ T304] addrconf_notify+0x151/0xf30 [ 17.758066][ T304] notifier_call_chain+0xb0/0x320 [ 17.758206][ T304] __dev_notify_flags+0xde/0x280 [ 17.758301][ T304] netif_change_flags+0xfe/0x190 [ 17.758397][ T304] do_setlink.isra.0+0x1cc3/0x2750 [ 17.758534][ T304] rtnl_newlink+0x8d1/0xef0 [ 17.758630][ T304] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 17.758730][ T304] netlink_rcv_skb+0x14e/0x3a0 [ 17.758870][ T304] netlink_unicast+0x486/0x750 [ 17.758967][ T304] netlink_sendmsg+0x735/0xc60 [ 17.759064][ T304] ____sys_sendmsg+0x419/0x850 [ 17.759201][ T304] ___sys_sendmsg+0x14e/0x1d0 [ 17.759299][ T304] __sys_sendmsg+0x145/0x1f0 [ 17.759394][ T304] do_syscall_64+0x117/0x590 [ 17.759532][ T304] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.759646][ T304] INITIAL READ USE at: [ 17.759724][ T304] __lock_acquire+0x378/0xc10 [ 17.759819][ T304] lock_acquire.part.0+0xbc/0x260 [ 17.759973][ T304] _raw_read_lock_bh+0x44/0x80 [ 17.760067][ T304] inet6_fill_ifla6_attrs+0x1aee/0x21e0 [ 17.760222][ T304] inet6_fill_link_af+0x5c/0xe0 [ 17.760316][ T304] rtnl_fill_ifinfo.isra.0+0x1a45/0x2c20 [ 17.760431][ T304] rtnl_getlink+0x9c9/0xeb0 [ 17.760569][ T304] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 17.760667][ T304] netlink_rcv_skb+0x14e/0x3a0 [ 17.760761][ T304] netlink_unicast+0x486/0x750 [ 17.760856][ T304] netlink_sendmsg+0x735/0xc60 [ 17.760994][ T304] ____sys_sendmsg+0x419/0x850 [ 17.761092][ T304] ___sys_sendmsg+0x14e/0x1d0 [ 17.761187][ T304] __sys_sendmsg+0x145/0x1f0 [ 17.761322][ T304] do_syscall_64+0x117/0x590 [ 17.761416][ T304] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.761529][ T304] } [ 17.761609][ T304] ... key at: [] __key.37+0x0/0x40 [ 17.761731][ T304] ... acquired at: [ 17.761789][ T304] __lock_acquire+0x508/0xc10 [ 17.761864][ T304] lock_acquire.part.0+0xbc/0x260 [ 17.761980][ T304] _raw_spin_lock+0x33/0x40 [ 17.762056][ T304] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 17.762150][ T304] __ipv6_dev_ac_inc+0x57e/0x930 [ 17.762227][ T304] addrconf_join_anycast+0x1bc/0x260 [ 17.762342][ T304] __ipv6_ifa_notify+0x75b/0xad0 [ 17.762420][ T304] addrconf_dad_completed+0x14b/0xe10 [ 17.762496][ T304] addrconf_dad_work+0x3c1/0x930 [ 17.762574][ T304] process_one_work+0xdf8/0x1410 [ 17.762699][ T304] worker_thread+0x4f1/0xd60 [ 17.762775][ T304] kthread+0x367/0x460 [ 17.762834][ T304] ret_from_fork+0x474/0x6b0 [ 17.762911][ T304] ret_from_fork_asm+0x11/0x20 [ 17.763030][ T304] [ 17.763069][ T304] -> (acaddr_hash_lock){+.+.}-{3:3} { [ 17.763145][ T304] HARDIRQ-ON-W at: [ 17.763202][ T304] __lock_acquire+0x378/0xc10 [ 17.763297][ T304] lock_acquire.part.0+0xbc/0x260 [ 17.763436][ T304] _raw_spin_lock+0x33/0x40 [ 17.763531][ T304] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 17.763644][ T304] __ipv6_dev_ac_inc+0x57e/0x930 [ 17.763783][ T304] addrconf_join_anycast+0x1bc/0x260 [ 17.763878][ T304] __ipv6_ifa_notify+0x75b/0xad0 [ 17.763973][ T304] addrconf_dad_completed+0x14b/0xe10 [ 17.764112][ T304] addrconf_dad_work+0x3c1/0x930 [ 17.764206][ T304] process_one_work+0xdf8/0x1410 [ 17.764302][ T304] worker_thread+0x4f1/0xd60 [ 17.764439][ T304] kthread+0x367/0x460 [ 17.764515][ T304] ret_from_fork+0x474/0x6b0 [ 17.764613][ T304] ret_from_fork_asm+0x11/0x20 [ 17.764754][ T304] SOFTIRQ-ON-W at: [ 17.764812][ T304] __lock_acquire+0x378/0xc10 [ 17.764907][ T304] lock_acquire.part.0+0xbc/0x260 [ 17.765001][ T304] _raw_spin_lock+0x33/0x40 [ 17.765139][ T304] __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.765235][ T304] addrconf_leave_anycast+0x1bc/0x260 [ 17.765329][ T304] dev_forward_change+0x3b3/0x850 [ 17.765466][ T304] addrconf_fixup_forwarding+0x2af/0x4d0 [ 17.765581][ T304] addrconf_sysctl_forward+0x209/0x2b0 [ 17.765679][ T304] proc_sys_call_handler+0x31b/0x480 [ 17.765819][ T304] new_sync_write+0x333/0x750 [ 17.765913][ T304] vfs_write+0x6a4/0xc10 [ 17.766008][ T304] ksys_write+0x116/0x250 [ 17.766145][ T304] do_syscall_64+0x117/0x590 [ 17.766241][ T304] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.766355][ T304] INITIAL USE at: [ 17.766412][ T304] __lock_acquire+0x378/0xc10 [ 17.766550][ T304] lock_acquire.part.0+0xbc/0x260 [ 17.766645][ T304] _raw_spin_lock+0x33/0x40 [ 17.766744][ T304] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 17.766898][ T304] __ipv6_dev_ac_inc+0x57e/0x930 [ 17.766993][ T304] addrconf_join_anycast+0x1bc/0x260 [ 17.767088][ T304] __ipv6_ifa_notify+0x75b/0xad0 [ 17.767224][ T304] addrconf_dad_completed+0x14b/0xe10 [ 17.767320][ T304] addrconf_dad_work+0x3c1/0x930 [ 17.767417][ T304] process_one_work+0xdf8/0x1410 [ 17.767554][ T304] worker_thread+0x4f1/0xd60 [ 17.767651][ T304] kthread+0x367/0x460 [ 17.767731][ T304] ret_from_fork+0x474/0x6b0 [ 17.767828][ T304] ret_from_fork_asm+0x11/0x20 [ 17.767965][ T304] } [ 17.768004][ T304] ... key at: [] acaddr_hash_lock+0x18/0x45a0 [ 17.768117][ T304] ... acquired at: [ 17.768175][ T304] mark_lock+0x1d7/0xa00 [ 17.768291][ T304] mark_usage+0x105/0x170 [ 17.768367][ T304] __lock_acquire+0x378/0xc10 [ 17.768442][ T304] lock_acquire.part.0+0xbc/0x260 [ 17.768517][ T304] _raw_spin_lock+0x33/0x40 [ 17.768636][ T304] __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.768715][ T304] addrconf_leave_anycast+0x1bc/0x260 [ 17.768791][ T304] dev_forward_change+0x3b3/0x850 [ 17.768868][ T304] addrconf_fixup_forwarding+0x2af/0x4d0 [ 17.769003][ T304] addrconf_sysctl_forward+0x209/0x2b0 [ 17.769079][ T304] proc_sys_call_handler+0x31b/0x480 [ 17.769154][ T304] new_sync_write+0x333/0x750 [ 17.769273][ T304] vfs_write+0x6a4/0xc10 [ 17.769348][ T304] ksys_write+0x116/0x250 [ 17.769423][ T304] do_syscall_64+0x117/0x590 [ 17.769501][ T304] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.769636][ T304] [ 17.769676][ T304] [ 17.769676][ T304] stack backtrace: [ 17.769774][ T304] CPU: 2 UID: 0 PID: 304 Comm: sysctl Not tainted 7.1.0-rc5-virtme #1 PREEMPT(full) [ 17.769777][ T304] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 17.769778][ T304] Call Trace: [ 17.769780][ T304] [ 17.769781][ T304] dump_stack_lvl+0x6f/0xa0 [ 17.769785][ T304] print_irq_inversion_bug.part.0.cold+0xe6/0x143 [ 17.769788][ T304] mark_lock_irq+0x989/0x9c0 [ 17.769791][ T304] mark_lock+0x1d7/0xa00 [ 17.769793][ T304] mark_usage+0x105/0x170 [ 17.769794][ T304] __lock_acquire+0x378/0xc10 [ 17.769796][ T304] lock_acquire.part.0+0xbc/0x260 [ 17.769798][ T304] ? __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.769799][ T304] ? rcu_is_watching+0x15/0xd0 [ 17.769803][ T304] ? do_raw_read_unlock+0x70/0x70 [ 17.769805][ T304] ? lock_acquire+0x134/0x160 [ 17.769806][ T304] _raw_spin_lock+0x33/0x40 [ 17.769808][ T304] ? __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.769809][ T304] __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.769812][ T304] addrconf_leave_anycast+0x1bc/0x260 [ 17.769813][ T304] ? find_held_lock+0x2b/0x80 [ 17.769816][ T304] ? __ipv6_isatap_ifid+0x210/0x210 [ 17.769818][ T304] ? mark_held_locks+0x40/0x70 [ 17.769819][ T304] ? lockdep_hardirqs_on+0x8c/0x130 [ 17.769822][ T304] dev_forward_change+0x3b3/0x850 [ 17.769824][ T304] ? addrconf_fixup_forwarding+0x4d/0x4d0 [ 17.769825][ T304] ? addrconf_sysctl_proxy_ndp+0x2f0/0x2f0 [ 17.769828][ T304] addrconf_fixup_forwarding+0x2af/0x4d0 [ 17.769830][ T304] addrconf_sysctl_forward+0x209/0x2b0 [ 17.769832][ T304] ? addrconf_fixup_forwarding+0x4d0/0x4d0 [ 17.769835][ T304] ? addrconf_fixup_forwarding+0x4d0/0x4d0 [ 17.769837][ T304] ? __kvmalloc_node_noprof+0x305/0x8a0 [ 17.769840][ T304] ? proc_sys_call_handler+0x25d/0x480 [ 17.769842][ T304] proc_sys_call_handler+0x31b/0x480 [ 17.769844][ T304] ? proc_sys_lookup+0x3d0/0x3d0 [ 17.769846][ T304] ? rcu_read_unlock+0x1b/0x70 [ 17.769849][ T304] ? do_raw_spin_unlock+0x59/0x250 [ 17.769850][ T304] ? rcu_lockdep_current_cpu_online+0x39/0x1b0 [ 17.769852][ T304] ? rcu_read_lock_any_held+0x3c/0x90 [ 17.769854][ T304] ? proc_sys_call_handler+0x480/0x480 [ 17.769856][ T304] new_sync_write+0x333/0x750 [ 17.769858][ T304] ? __lock_acquire+0x508/0xc10 [ 17.769859][ T304] ? new_sync_read+0x740/0x740 [ 17.769861][ T304] ? lock_acquire.part.0+0xbc/0x260 [ 17.769862][ T304] ? ksys_write+0x116/0x250 [ 17.769864][ T304] vfs_write+0x6a4/0xc10 [ 17.769866][ T304] ksys_write+0x116/0x250 [ 17.769867][ T304] ? __ia32_sys_read+0xc0/0xc0 [ 17.769869][ T304] ? rcu_is_watching+0x15/0xd0 [ 17.769870][ T304] ? rcu_is_watching+0x15/0xd0 [ 17.769872][ T304] do_syscall_64+0x117/0x590 [ 17.769873][ T304] ? trace_hardirqs_off+0xd/0x30 [ 17.769876][ T304] ? exc_page_fault+0xee/0x100 [ 17.769878][ T304] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.769880][ T304] RIP: 0033:0x7fdabfc2808e [ 17.769883][ T304] 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 [ 17.769884][ T304] RSP: 002b:00007ffdacb7b5d0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 17.769887][ T304] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fdabfc2808e [ 17.769888][ T304] RDX: 0000000000000002 RSI: 000055ca2a8924b0 RDI: 0000000000000005 [ 17.769889][ T304] RBP: 00007ffdacb7b5e0 R08: 0000000000000000 R09: 0000000000000000 [ 17.769890][ T304] R10: 0000000000000000 R11: 0000000000000202 R12: 000055ca2a8945e0 [ 17.769891][ T304] R13: 000055ca2a892470 R14: 0000000000000002 R15: 0000000000000000 [ 17.769893][ T304]