[ 237.177244][ T1839] [ 237.177335][ T1839] ======================================================== [ 237.177467][ T1839] WARNING: possible irq lock inversion dependency detected [ 237.177587][ T1839] 7.1.0-rc5-virtme #1 Not tainted [ 237.177668][ T1839] -------------------------------------------------------- [ 237.177789][ T1839] sysctl/1839 just changed the state of lock: [ 237.177892][ T1839] ffffffffb0b7e8b8 (acaddr_hash_lock){+.+.}-{3:3}, at: __ipv6_dev_ac_dec+0x236/0x5d0 [ 237.178043][ T1839] but this lock was taken by another, SOFTIRQ-READ-safe lock in the past: [ 237.178160][ T1839] (&ndev->lock){++.-}-{3:3} [ 237.178163][ T1839] [ 237.178163][ T1839] [ 237.178163][ T1839] and interrupts could create inverse lock ordering between them. [ 237.178163][ T1839] [ 237.178460][ T1839] [ 237.178460][ T1839] other info that might help us debug this: [ 237.178578][ T1839] Possible interrupt unsafe locking scenario: [ 237.178578][ T1839] [ 237.178696][ T1839] CPU0 CPU1 [ 237.178778][ T1839] ---- ---- [ 237.178858][ T1839] lock(acaddr_hash_lock); [ 237.178940][ T1839] local_irq_disable(); [ 237.179040][ T1839] lock(&ndev->lock); [ 237.179144][ T1839] lock(acaddr_hash_lock); [ 237.179246][ T1839] [ 237.179306][ T1839] lock(&ndev->lock); [ 237.179368][ T1839] [ 237.179368][ T1839] *** DEADLOCK *** [ 237.179368][ T1839] [ 237.179492][ T1839] 2 locks held by sysctl/1839: [ 237.179574][ T1839] #0: ff11000009ba13e0 (sb_writers#3){.+.+}-{0:0}, at: ksys_write+0x116/0x250 [ 237.179720][ T1839] #1: ffffffffb0a8c9c0 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_fixup_forwarding+0x4d/0x4d0 [ 237.179880][ T1839] [ 237.179880][ T1839] the shortest dependencies between 2nd lock and 1st lock: [ 237.180019][ T1839] -> (&ndev->lock){++.-}-{3:3} { [ 237.180104][ T1839] HARDIRQ-ON-W at: [ 237.180167][ T1839] __lock_acquire+0x378/0xc10 [ 237.180271][ T1839] lock_acquire.part.0+0xbc/0x260 [ 237.180371][ T1839] _raw_write_lock_bh+0x38/0x50 [ 237.180479][ T1839] addrconf_permanent_addr+0x108/0x9c0 [ 237.180599][ T1839] addrconf_notify+0x151/0xf30 [ 237.180700][ T1839] notifier_call_chain+0xb0/0x320 [ 237.180801][ T1839] __dev_notify_flags+0xde/0x280 [ 237.180904][ T1839] netif_change_flags+0xfe/0x190 [ 237.181005][ T1839] do_setlink.isra.0+0x1cc3/0x2750 [ 237.181107][ T1839] rtnl_newlink+0x8d1/0xef0 [ 237.181219][ T1839] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 237.181322][ T1839] netlink_rcv_skb+0x14e/0x3a0 [ 237.181430][ T1839] netlink_unicast+0x486/0x750 [ 237.181531][ T1839] netlink_sendmsg+0x735/0xc60 [ 237.181634][ T1839] ____sys_sendmsg+0x419/0x850 [ 237.181736][ T1839] ___sys_sendmsg+0x14e/0x1d0 [ 237.181838][ T1839] __sys_sendmsg+0x145/0x1f0 [ 237.181940][ T1839] do_syscall_64+0x117/0x590 [ 237.182045][ T1839] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 237.182166][ T1839] HARDIRQ-ON-R at: [ 237.182228][ T1839] __lock_acquire+0x378/0xc10 [ 237.182329][ T1839] lock_acquire.part.0+0xbc/0x260 [ 237.182434][ T1839] _raw_read_lock_bh+0x44/0x80 [ 237.182537][ T1839] inet6_fill_ifla6_attrs+0x1aee/0x21e0 [ 237.182657][ T1839] inet6_fill_link_af+0x5c/0xe0 [ 237.182758][ T1839] rtnl_fill_ifinfo.isra.0+0x1a45/0x2c20 [ 237.182882][ T1839] rtnl_getlink+0x9c9/0xeb0 [ 237.182983][ T1839] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 237.183084][ T1839] netlink_rcv_skb+0x14e/0x3a0 [ 237.183184][ T1839] netlink_unicast+0x486/0x750 [ 237.183284][ T1839] netlink_sendmsg+0x735/0xc60 [ 237.183385][ T1839] ____sys_sendmsg+0x419/0x850 [ 237.183492][ T1839] ___sys_sendmsg+0x14e/0x1d0 [ 237.183593][ T1839] __sys_sendmsg+0x145/0x1f0 [ 237.183694][ T1839] do_syscall_64+0x117/0x590 [ 237.183798][ T1839] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 237.183917][ T1839] IN-SOFTIRQ-R at: [ 237.183978][ T1839] __lock_acquire+0x378/0xc10 [ 237.184079][ T1839] lock_acquire.part.0+0xbc/0x260 [ 237.184182][ T1839] _raw_read_lock_bh+0x44/0x80 [ 237.184283][ T1839] ipv6_get_lladdr+0xa8/0x3f0 [ 237.184385][ T1839] ndisc_send_ns+0xf3/0x120 [ 237.184489][ T1839] ndisc_solicit+0x314/0x480 [ 237.184590][ T1839] neigh_probe+0xb3/0x100 [ 237.184693][ T1839] __neigh_event_send+0x802/0x1070 [ 237.184795][ T1839] neigh_resolve_output+0xbe/0x140 [ 237.184895][ T1839] ip6_finish_output2+0x423/0x1300 [ 237.184995][ T1839] ip6_finish_output+0x646/0xda0 [ 237.185098][ T1839] ip6_output+0x23f/0x7f0 [ 237.185201][ T1839] ip6_forward+0x10f4/0x2bd0 [ 237.185302][ T1839] ipv6_rcv+0x3c1/0x5a0 [ 237.185403][ T1839] __netif_receive_skb_one_core+0xfc/0x180 [ 237.185528][ T1839] process_backlog+0x2bc/0x1490 [ 237.185629][ T1839] __napi_poll+0xa7/0x3b0 [ 237.185733][ T1839] net_rx_action+0x513/0xf50 [ 237.185835][ T1839] handle_softirqs+0x1d8/0x940 [ 237.185937][ T1839] do_softirq+0xa9/0xe0 [ 237.186039][ T1839] __local_bh_enable_ip+0x113/0x140 [ 237.186140][ T1839] __neigh_event_send+0x30a/0x1070 [ 237.186242][ T1839] neigh_resolve_output+0xbe/0x140 [ 237.186344][ T1839] ip6_finish_output2+0x423/0x1300 [ 237.186451][ T1839] ip6_finish_output+0x646/0xda0 [ 237.186552][ T1839] ip6_output+0x23f/0x7f0 [ 237.186655][ T1839] ip6_send_skb+0xee/0x350 [ 237.186758][ T1839] rawv6_push_pending_frames+0x4cb/0xa90 [ 237.186880][ T1839] rawv6_sendmsg+0x1434/0x1a50 [ 237.186981][ T1839] __sys_sendto+0x2c9/0x400 [ 237.187086][ T1839] __x64_sys_sendto+0xe4/0x1f0 [ 237.187189][ T1839] do_syscall_64+0x117/0x590 [ 237.187293][ T1839] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 237.187419][ T1839] INITIAL USE at: [ 237.187483][ T1839] __lock_acquire+0x378/0xc10 [ 237.187584][ T1839] lock_acquire.part.0+0xbc/0x260 [ 237.187687][ T1839] _raw_write_lock_bh+0x38/0x50 [ 237.187789][ T1839] addrconf_permanent_addr+0x108/0x9c0 [ 237.187909][ T1839] addrconf_notify+0x151/0xf30 [ 237.188010][ T1839] notifier_call_chain+0xb0/0x320 [ 237.188110][ T1839] __dev_notify_flags+0xde/0x280 [ 237.188210][ T1839] netif_change_flags+0xfe/0x190 [ 237.188309][ T1839] do_setlink.isra.0+0x1cc3/0x2750 [ 237.188414][ T1839] rtnl_newlink+0x8d1/0xef0 [ 237.188515][ T1839] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 237.188616][ T1839] netlink_rcv_skb+0x14e/0x3a0 [ 237.188717][ T1839] netlink_unicast+0x486/0x750 [ 237.188818][ T1839] netlink_sendmsg+0x735/0xc60 [ 237.188919][ T1839] ____sys_sendmsg+0x419/0x850 [ 237.189020][ T1839] ___sys_sendmsg+0x14e/0x1d0 [ 237.189120][ T1839] __sys_sendmsg+0x145/0x1f0 [ 237.189219][ T1839] do_syscall_64+0x117/0x590 [ 237.189320][ T1839] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 237.189444][ T1839] INITIAL READ USE at: [ 237.189524][ T1839] __lock_acquire+0x378/0xc10 [ 237.189624][ T1839] lock_acquire.part.0+0xbc/0x260 [ 237.189745][ T1839] _raw_read_lock_bh+0x44/0x80 [ 237.189844][ T1839] inet6_fill_ifla6_attrs+0x1aee/0x21e0 [ 237.189965][ T1839] inet6_fill_link_af+0x5c/0xe0 [ 237.190064][ T1839] rtnl_fill_ifinfo.isra.0+0x1a45/0x2c20 [ 237.190182][ T1839] rtnl_getlink+0x9c9/0xeb0 [ 237.190282][ T1839] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 237.190382][ T1839] netlink_rcv_skb+0x14e/0x3a0 [ 237.190487][ T1839] netlink_unicast+0x486/0x750 [ 237.190587][ T1839] netlink_sendmsg+0x735/0xc60 [ 237.190688][ T1839] ____sys_sendmsg+0x419/0x850 [ 237.190789][ T1839] ___sys_sendmsg+0x14e/0x1d0 [ 237.190888][ T1839] __sys_sendmsg+0x145/0x1f0 [ 237.190988][ T1839] do_syscall_64+0x117/0x590 [ 237.191088][ T1839] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 237.191208][ T1839] } [ 237.191250][ T1839] ... key at: [] __key.37+0x0/0x40 [ 237.191372][ T1839] ... acquired at: [ 237.191437][ T1839] __lock_acquire+0x508/0xc10 [ 237.191518][ T1839] lock_acquire.part.0+0xbc/0x260 [ 237.191598][ T1839] _raw_spin_lock+0x33/0x40 [ 237.191678][ T1839] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 237.191777][ T1839] __ipv6_dev_ac_inc+0x57e/0x930 [ 237.191856][ T1839] addrconf_join_anycast+0x1bc/0x260 [ 237.191935][ T1839] __ipv6_ifa_notify+0x75b/0xad0 [ 237.192017][ T1839] addrconf_dad_completed+0x14b/0xe10 [ 237.192096][ T1839] addrconf_dad_work+0x3c1/0x930 [ 237.192177][ T1839] process_one_work+0xdf8/0x1410 [ 237.192258][ T1839] worker_thread+0x4f1/0xd60 [ 237.192337][ T1839] kthread+0x367/0x460 [ 237.192399][ T1839] ret_from_fork+0x474/0x6b0 [ 237.192485][ T1839] ret_from_fork_asm+0x11/0x20 [ 237.192568][ T1839] [ 237.192610][ T1839] -> (acaddr_hash_lock){+.+.}-{3:3} { [ 237.192692][ T1839] HARDIRQ-ON-W at: [ 237.192753][ T1839] __lock_acquire+0x378/0xc10 [ 237.192853][ T1839] lock_acquire.part.0+0xbc/0x260 [ 237.192953][ T1839] _raw_spin_lock+0x33/0x40 [ 237.193052][ T1839] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 237.193216][ T1839] __ipv6_dev_ac_inc+0x57e/0x930 [ 237.193316][ T1839] addrconf_join_anycast+0x1bc/0x260 [ 237.193419][ T1839] __ipv6_ifa_notify+0x75b/0xad0 [ 237.193559][ T1839] addrconf_dad_completed+0x14b/0xe10 [ 237.193658][ T1839] addrconf_dad_work+0x3c1/0x930 [ 237.193760][ T1839] process_one_work+0xdf8/0x1410 [ 237.193859][ T1839] worker_thread+0x4f1/0xd60 [ 237.194001][ T1839] kthread+0x367/0x460 [ 237.194082][ T1839] ret_from_fork+0x474/0x6b0 [ 237.194182][ T1839] ret_from_fork_asm+0x11/0x20 [ 237.194320][ T1839] SOFTIRQ-ON-W at: [ 237.194381][ T1839] __lock_acquire+0x378/0xc10 [ 237.194485][ T1839] lock_acquire.part.0+0xbc/0x260 [ 237.194585][ T1839] _raw_spin_lock+0x33/0x40 [ 237.194727][ T1839] __ipv6_dev_ac_dec+0x236/0x5d0 [ 237.194827][ T1839] addrconf_leave_anycast+0x1bc/0x260 [ 237.194927][ T1839] dev_forward_change+0x3b3/0x850 [ 237.195070][ T1839] addrconf_fixup_forwarding+0x2af/0x4d0 [ 237.195189][ T1839] addrconf_sysctl_forward+0x209/0x2b0 [ 237.195289][ T1839] proc_sys_call_handler+0x31b/0x480 [ 237.195436][ T1839] new_sync_write+0x333/0x750 [ 237.195535][ T1839] vfs_write+0x6a4/0xc10 [ 237.195634][ T1839] ksys_write+0x116/0x250 [ 237.195774][ T1839] do_syscall_64+0x117/0x590 [ 237.195873][ T1839] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 237.195991][ T1839] INITIAL USE at: [ 237.196092][ T1839] __lock_acquire+0x378/0xc10 [ 237.196191][ T1839] lock_acquire.part.0+0xbc/0x260 [ 237.196293][ T1839] _raw_spin_lock+0x33/0x40 [ 237.196393][ T1839] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 237.196556][ T1839] __ipv6_dev_ac_inc+0x57e/0x930 [ 237.196656][ T1839] addrconf_join_anycast+0x1bc/0x260 [ 237.196756][ T1839] __ipv6_ifa_notify+0x75b/0xad0 [ 237.196896][ T1839] addrconf_dad_completed+0x14b/0xe10 [ 237.196997][ T1839] addrconf_dad_work+0x3c1/0x930 [ 237.197098][ T1839] process_one_work+0xdf8/0x1410 [ 237.197240][ T1839] worker_thread+0x4f1/0xd60 [ 237.197340][ T1839] kthread+0x367/0x460 [ 237.197423][ T1839] ret_from_fork+0x474/0x6b0 [ 237.197564][ T1839] ret_from_fork_asm+0x11/0x20 [ 237.197664][ T1839] } [ 237.197704][ T1839] ... key at: [] acaddr_hash_lock+0x18/0x45a0 [ 237.197823][ T1839] ... acquired at: [ 237.197920][ T1839] mark_lock+0x1d7/0xa00 [ 237.197999][ T1839] mark_usage+0x105/0x170 [ 237.198078][ T1839] __lock_acquire+0x378/0xc10 [ 237.198159][ T1839] lock_acquire.part.0+0xbc/0x260 [ 237.198279][ T1839] _raw_spin_lock+0x33/0x40 [ 237.198359][ T1839] __ipv6_dev_ac_dec+0x236/0x5d0 [ 237.198444][ T1839] addrconf_leave_anycast+0x1bc/0x260 [ 237.198523][ T1839] dev_forward_change+0x3b3/0x850 [ 237.198640][ T1839] addrconf_fixup_forwarding+0x2af/0x4d0 [ 237.198741][ T1839] addrconf_sysctl_forward+0x209/0x2b0 [ 237.198821][ T1839] proc_sys_call_handler+0x31b/0x480 [ 237.198900][ T1839] new_sync_write+0x333/0x750 [ 237.199019][ T1839] vfs_write+0x6a4/0xc10 [ 237.199099][ T1839] ksys_write+0x116/0x250 [ 237.199177][ T1839] do_syscall_64+0x117/0x590 [ 237.199257][ T1839] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 237.199396][ T1839] [ 237.199439][ T1839] [ 237.199439][ T1839] stack backtrace: [ 237.199539][ T1839] CPU: 2 UID: 0 PID: 1839 Comm: sysctl Not tainted 7.1.0-rc5-virtme #1 PREEMPT(full) [ 237.199542][ T1839] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 237.199544][ T1839] Call Trace: [ 237.199546][ T1839] [ 237.199547][ T1839] dump_stack_lvl+0x6f/0xa0 [ 237.199551][ T1839] print_irq_inversion_bug.part.0.cold+0xe6/0x143 [ 237.199554][ T1839] mark_lock_irq+0x989/0x9c0 [ 237.199556][ T1839] mark_lock+0x1d7/0xa00 [ 237.199558][ T1839] mark_usage+0x105/0x170 [ 237.199560][ T1839] __lock_acquire+0x378/0xc10 [ 237.199562][ T1839] lock_acquire.part.0+0xbc/0x260 [ 237.199563][ T1839] ? __ipv6_dev_ac_dec+0x236/0x5d0 [ 237.199564][ T1839] ? rcu_is_watching+0x15/0xd0 [ 237.199567][ T1839] ? do_raw_read_unlock+0x70/0x70 [ 237.199569][ T1839] ? lock_acquire+0x134/0x160 [ 237.199571][ T1839] _raw_spin_lock+0x33/0x40 [ 237.199572][ T1839] ? __ipv6_dev_ac_dec+0x236/0x5d0 [ 237.199574][ T1839] __ipv6_dev_ac_dec+0x236/0x5d0 [ 237.199576][ T1839] addrconf_leave_anycast+0x1bc/0x260 [ 237.199577][ T1839] ? find_held_lock+0x2b/0x80 [ 237.199580][ T1839] ? __ipv6_isatap_ifid+0x210/0x210 [ 237.199581][ T1839] ? mark_held_locks+0x40/0x70 [ 237.199583][ T1839] ? lockdep_hardirqs_on+0x8c/0x130 [ 237.199585][ T1839] dev_forward_change+0x3b3/0x850 [ 237.199587][ T1839] ? addrconf_fixup_forwarding+0x4d/0x4d0 [ 237.199589][ T1839] ? addrconf_sysctl_proxy_ndp+0x2f0/0x2f0 [ 237.199592][ T1839] addrconf_fixup_forwarding+0x2af/0x4d0 [ 237.199594][ T1839] addrconf_sysctl_forward+0x209/0x2b0 [ 237.199596][ T1839] ? addrconf_fixup_forwarding+0x4d0/0x4d0 [ 237.199598][ T1839] ? addrconf_fixup_forwarding+0x4d0/0x4d0 [ 237.199600][ T1839] ? __kvmalloc_node_noprof+0x305/0x8a0 [ 237.199603][ T1839] ? proc_sys_call_handler+0x25d/0x480 [ 237.199606][ T1839] proc_sys_call_handler+0x31b/0x480 [ 237.199608][ T1839] ? proc_sys_lookup+0x3d0/0x3d0 [ 237.199610][ T1839] ? rcu_read_unlock+0x1b/0x70 [ 237.199612][ T1839] ? do_raw_spin_unlock+0x59/0x250 [ 237.199613][ T1839] ? rcu_lockdep_current_cpu_online+0x39/0x1b0 [ 237.199616][ T1839] ? rcu_read_lock_any_held+0x3c/0x90 [ 237.199617][ T1839] ? proc_sys_call_handler+0x480/0x480 [ 237.199619][ T1839] new_sync_write+0x333/0x750 [ 237.199621][ T1839] ? __lock_acquire+0x508/0xc10 [ 237.199622][ T1839] ? new_sync_read+0x740/0x740 [ 237.199624][ T1839] ? lock_acquire.part.0+0xbc/0x260 [ 237.199625][ T1839] ? ksys_write+0x116/0x250 [ 237.199627][ T1839] vfs_write+0x6a4/0xc10 [ 237.199629][ T1839] ksys_write+0x116/0x250 [ 237.199630][ T1839] ? __ia32_sys_read+0xc0/0xc0 [ 237.199632][ T1839] ? rcu_is_watching+0x15/0xd0 [ 237.199633][ T1839] ? rcu_is_watching+0x15/0xd0 [ 237.199635][ T1839] do_syscall_64+0x117/0x590 [ 237.199636][ T1839] ? trace_hardirqs_off+0xd/0x30 [ 237.199639][ T1839] ? exc_page_fault+0xee/0x100 [ 237.199641][ T1839] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 237.199642][ T1839] RIP: 0033:0x7f7b2106908e [ 237.199645][ T1839] 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 [ 237.199647][ T1839] RSP: 002b:00007ffffac36dc0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 237.199649][ T1839] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f7b2106908e [ 237.199651][ T1839] RDX: 0000000000000002 RSI: 000055cf8e7844b0 RDI: 0000000000000005 [ 237.199651][ T1839] RBP: 00007ffffac36dd0 R08: 0000000000000000 R09: 0000000000000000 [ 237.199652][ T1839] R10: 0000000000000000 R11: 0000000000000202 R12: 000055cf8e7865e0 [ 237.199653][ T1839] R13: 000055cf8e784470 R14: 0000000000000002 R15: 0000000000000000 [ 237.199655][ T1839]