[ 49.610013][ T2735] [ 49.610092][ T2735] ======================================================== [ 49.610197][ T2735] WARNING: possible irq lock inversion dependency detected [ 49.610297][ T2735] 7.1.0-rc5-virtme #1 Not tainted [ 49.610363][ T2735] -------------------------------------------------------- [ 49.610462][ T2735] sysctl/2735 just changed the state of lock: [ 49.610547][ T2735] ffffffffb657e8b8 (acaddr_hash_lock){+.+.}-{3:3}, at: __ipv6_dev_ac_dec+0x236/0x5d0 [ 49.610673][ T2735] but this lock was taken by another, SOFTIRQ-READ-safe lock in the past: [ 49.610774][ T2735] (&ndev->lock){++.-}-{3:3} [ 49.610776][ T2735] [ 49.610776][ T2735] [ 49.610776][ T2735] and interrupts could create inverse lock ordering between them. [ 49.610776][ T2735] [ 49.611023][ T2735] [ 49.611023][ T2735] other info that might help us debug this: [ 49.611121][ T2735] Possible interrupt unsafe locking scenario: [ 49.611121][ T2735] [ 49.611219][ T2735] CPU0 CPU1 [ 49.611292][ T2735] ---- ---- [ 49.611361][ T2735] lock(acaddr_hash_lock); [ 49.611431][ T2735] local_irq_disable(); [ 49.611515][ T2735] lock(&ndev->lock); [ 49.611602][ T2735] lock(acaddr_hash_lock); [ 49.611687][ T2735] [ 49.611740][ T2735] lock(&ndev->lock); [ 49.611794][ T2735] [ 49.611794][ T2735] *** DEADLOCK *** [ 49.611794][ T2735] [ 49.611894][ T2735] 2 locks held by sysctl/2735: [ 49.611966][ T2735] #0: ff11000009bc43e0 (sb_writers#3){.+.+}-{0:0}, at: ksys_write+0x116/0x250 [ 49.612090][ T2735] #1: ffffffffb648c9c0 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_fixup_forwarding+0x4d/0x4d0 [ 49.612227][ T2735] [ 49.612227][ T2735] the shortest dependencies between 2nd lock and 1st lock: [ 49.612345][ T2735] -> (&ndev->lock){++.-}-{3:3} { [ 49.612416][ T2735] HARDIRQ-ON-W at: [ 49.612470][ T2735] __lock_acquire+0x378/0xc10 [ 49.612566][ T2735] lock_acquire.part.0+0xbc/0x260 [ 49.612657][ T2735] _raw_write_lock_bh+0x38/0x50 [ 49.612742][ T2735] addrconf_permanent_addr+0x108/0x9c0 [ 49.612846][ T2735] addrconf_notify+0x151/0xf30 [ 49.612931][ T2735] notifier_call_chain+0xb0/0x320 [ 49.613018][ T2735] __dev_notify_flags+0xde/0x280 [ 49.613104][ T2735] netif_change_flags+0xfe/0x190 [ 49.613188][ T2735] do_setlink.isra.0+0x1cc3/0x2750 [ 49.613275][ T2735] rtnl_newlink+0x8d1/0xef0 [ 49.613360][ T2735] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 49.613444][ T2735] netlink_rcv_skb+0x14e/0x3a0 [ 49.613530][ T2735] netlink_unicast+0x486/0x750 [ 49.613615][ T2735] netlink_sendmsg+0x735/0xc60 [ 49.613698][ T2735] ____sys_sendmsg+0x419/0x850 [ 49.613782][ T2735] ___sys_sendmsg+0x14e/0x1d0 [ 49.613866][ T2735] __sys_sendmsg+0x145/0x1f0 [ 49.613950][ T2735] do_syscall_64+0x117/0x590 [ 49.614044][ T2735] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 49.614145][ T2735] HARDIRQ-ON-R at: [ 49.614196][ T2735] __lock_acquire+0x378/0xc10 [ 49.614283][ T2735] lock_acquire.part.0+0xbc/0x260 [ 49.614369][ T2735] _raw_read_lock_bh+0x44/0x80 [ 49.614452][ T2735] inet6_fill_ifla6_attrs+0x1aee/0x21e0 [ 49.614553][ T2735] inet6_fill_link_af+0x5c/0xe0 [ 49.614634][ T2735] rtnl_fill_ifinfo.isra.0+0x1a45/0x2c20 [ 49.614735][ T2735] rtnl_getlink+0x9c9/0xeb0 [ 49.614819][ T2735] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 49.614904][ T2735] netlink_rcv_skb+0x14e/0x3a0 [ 49.614994][ T2735] netlink_unicast+0x486/0x750 [ 49.615077][ T2735] netlink_sendmsg+0x735/0xc60 [ 49.615164][ T2735] ____sys_sendmsg+0x419/0x850 [ 49.615247][ T2735] ___sys_sendmsg+0x14e/0x1d0 [ 49.615330][ T2735] __sys_sendmsg+0x145/0x1f0 [ 49.615413][ T2735] do_syscall_64+0x117/0x590 [ 49.615494][ T2735] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 49.615592][ T2735] IN-SOFTIRQ-R at: [ 49.615644][ T2735] __lock_acquire+0x378/0xc10 [ 49.615726][ T2735] lock_acquire.part.0+0xbc/0x260 [ 49.615807][ T2735] _raw_read_lock_bh+0x44/0x80 [ 49.615890][ T2735] ipv6_get_lladdr+0xa8/0x3f0 [ 49.615978][ T2735] ndisc_send_ns+0xf3/0x120 [ 49.616062][ T2735] ndisc_solicit+0x314/0x480 [ 49.616145][ T2735] neigh_probe+0xb3/0x100 [ 49.616228][ T2735] __neigh_event_send+0x802/0x1070 [ 49.616312][ T2735] neigh_resolve_output+0xbe/0x140 [ 49.616395][ T2735] ip6_finish_output2+0x423/0x1300 [ 49.616479][ T2735] ip6_finish_output+0x646/0xda0 [ 49.616563][ T2735] ip6_output+0x23f/0x7f0 [ 49.616645][ T2735] ip6_forward+0x10f4/0x2bd0 [ 49.616728][ T2735] ipv6_rcv+0x3c1/0x5a0 [ 49.616810][ T2735] __netif_receive_skb_one_core+0xfc/0x180 [ 49.616909][ T2735] process_backlog+0x2bc/0x1490 [ 49.616995][ T2735] __napi_poll+0xa7/0x3b0 [ 49.617077][ T2735] net_rx_action+0x513/0xf50 [ 49.617160][ T2735] handle_softirqs+0x1d8/0x940 [ 49.617245][ T2735] do_softirq+0xa9/0xe0 [ 49.617328][ T2735] __local_bh_enable_ip+0x113/0x140 [ 49.617412][ T2735] __neigh_event_send+0x30a/0x1070 [ 49.617495][ T2735] neigh_resolve_output+0xbe/0x140 [ 49.617578][ T2735] ip6_finish_output2+0x423/0x1300 [ 49.617663][ T2735] ip6_finish_output+0x646/0xda0 [ 49.617746][ T2735] ip6_output+0x23f/0x7f0 [ 49.617831][ T2735] ip6_send_skb+0xee/0x350 [ 49.617915][ T2735] rawv6_push_pending_frames+0x4cb/0xa90 [ 49.618020][ T2735] rawv6_sendmsg+0x1434/0x1a50 [ 49.618102][ T2735] __sys_sendto+0x2c9/0x400 [ 49.618184][ T2735] __x64_sys_sendto+0xe4/0x1f0 [ 49.618266][ T2735] do_syscall_64+0x117/0x590 [ 49.618347][ T2735] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 49.618448][ T2735] INITIAL USE at: [ 49.618499][ T2735] __lock_acquire+0x378/0xc10 [ 49.618582][ T2735] lock_acquire.part.0+0xbc/0x260 [ 49.618665][ T2735] _raw_write_lock_bh+0x38/0x50 [ 49.618760][ T2735] addrconf_permanent_addr+0x108/0x9c0 [ 49.618863][ T2735] addrconf_notify+0x151/0xf30 [ 49.618946][ T2735] notifier_call_chain+0xb0/0x320 [ 49.619033][ T2735] __dev_notify_flags+0xde/0x280 [ 49.619116][ T2735] netif_change_flags+0xfe/0x190 [ 49.619199][ T2735] do_setlink.isra.0+0x1cc3/0x2750 [ 49.619284][ T2735] rtnl_newlink+0x8d1/0xef0 [ 49.619365][ T2735] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 49.619448][ T2735] netlink_rcv_skb+0x14e/0x3a0 [ 49.619533][ T2735] netlink_unicast+0x486/0x750 [ 49.619618][ T2735] netlink_sendmsg+0x735/0xc60 [ 49.619702][ T2735] ____sys_sendmsg+0x419/0x850 [ 49.619787][ T2735] ___sys_sendmsg+0x14e/0x1d0 [ 49.619870][ T2735] __sys_sendmsg+0x145/0x1f0 [ 49.619953][ T2735] do_syscall_64+0x117/0x590 [ 49.620043][ T2735] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 49.620141][ T2735] INITIAL READ USE at: [ 49.620209][ T2735] __lock_acquire+0x378/0xc10 [ 49.620293][ T2735] lock_acquire.part.0+0xbc/0x260 [ 49.620393][ T2735] _raw_read_lock_bh+0x44/0x80 [ 49.620477][ T2735] inet6_fill_ifla6_attrs+0x1aee/0x21e0 [ 49.620576][ T2735] inet6_fill_link_af+0x5c/0xe0 [ 49.620660][ T2735] rtnl_fill_ifinfo.isra.0+0x1a45/0x2c20 [ 49.620761][ T2735] rtnl_getlink+0x9c9/0xeb0 [ 49.620844][ T2735] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 49.620927][ T2735] netlink_rcv_skb+0x14e/0x3a0 [ 49.621013][ T2735] netlink_unicast+0x486/0x750 [ 49.621096][ T2735] netlink_sendmsg+0x735/0xc60 [ 49.621181][ T2735] ____sys_sendmsg+0x419/0x850 [ 49.621264][ T2735] ___sys_sendmsg+0x14e/0x1d0 [ 49.621347][ T2735] __sys_sendmsg+0x145/0x1f0 [ 49.621427][ T2735] do_syscall_64+0x117/0x590 [ 49.621508][ T2735] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 49.621608][ T2735] } [ 49.621642][ T2735] ... key at: [] __key.37+0x0/0x40 [ 49.621743][ T2735] ... acquired at: [ 49.621793][ T2735] __lock_acquire+0x508/0xc10 [ 49.621862][ T2735] lock_acquire.part.0+0xbc/0x260 [ 49.621928][ T2735] _raw_spin_lock+0x33/0x40 [ 49.622001][ T2735] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 49.622083][ T2735] __ipv6_dev_ac_inc+0x57e/0x930 [ 49.622149][ T2735] addrconf_join_anycast+0x1bc/0x260 [ 49.622216][ T2735] __ipv6_ifa_notify+0x75b/0xad0 [ 49.622284][ T2735] addrconf_dad_completed+0x14b/0xe10 [ 49.622350][ T2735] addrconf_dad_work+0x3c1/0x930 [ 49.622417][ T2735] process_one_work+0xdf8/0x1410 [ 49.622486][ T2735] worker_thread+0x4f1/0xd60 [ 49.622554][ T2735] kthread+0x367/0x460 [ 49.622605][ T2735] ret_from_fork+0x474/0x6b0 [ 49.622671][ T2735] ret_from_fork_asm+0x11/0x20 [ 49.622738][ T2735] [ 49.622772][ T2735] -> (acaddr_hash_lock){+.+.}-{3:3} { [ 49.622843][ T2735] HARDIRQ-ON-W at: [ 49.622893][ T2735] __lock_acquire+0x378/0xc10 [ 49.622982][ T2735] lock_acquire.part.0+0xbc/0x260 [ 49.623064][ T2735] _raw_spin_lock+0x33/0x40 [ 49.623146][ T2735] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 49.623245][ T2735] __ipv6_dev_ac_inc+0x57e/0x930 [ 49.623327][ T2735] addrconf_join_anycast+0x1bc/0x260 [ 49.623412][ T2735] __ipv6_ifa_notify+0x75b/0xad0 [ 49.623495][ T2735] addrconf_dad_completed+0x14b/0xe10 [ 49.623578][ T2735] addrconf_dad_work+0x3c1/0x930 [ 49.623661][ T2735] process_one_work+0xdf8/0x1410 [ 49.623745][ T2735] worker_thread+0x4f1/0xd60 [ 49.623831][ T2735] kthread+0x367/0x460 [ 49.623898][ T2735] ret_from_fork+0x474/0x6b0 [ 49.623982][ T2735] ret_from_fork_asm+0x11/0x20 [ 49.624065][ T2735] SOFTIRQ-ON-W at: [ 49.624115][ T2735] __lock_acquire+0x378/0xc10 [ 49.624198][ T2735] lock_acquire.part.0+0xbc/0x260 [ 49.624283][ T2735] _raw_spin_lock+0x33/0x40 [ 49.624366][ T2735] __ipv6_dev_ac_dec+0x236/0x5d0 [ 49.624448][ T2735] addrconf_leave_anycast+0x1bc/0x260 [ 49.624530][ T2735] dev_forward_change+0x3b3/0x850 [ 49.624613][ T2735] addrconf_fixup_forwarding+0x2af/0x4d0 [ 49.624711][ T2735] addrconf_sysctl_forward+0x209/0x2b0 [ 49.624794][ T2735] proc_sys_call_handler+0x31b/0x480 [ 49.624880][ T2735] new_sync_write+0x333/0x750 [ 49.624968][ T2735] vfs_write+0x6a4/0xc10 [ 49.625054][ T2735] ksys_write+0x116/0x250 [ 49.625137][ T2735] do_syscall_64+0x117/0x590 [ 49.625221][ T2735] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 49.625321][ T2735] INITIAL USE at: [ 49.625372][ T2735] __lock_acquire+0x378/0xc10 [ 49.625454][ T2735] lock_acquire.part.0+0xbc/0x260 [ 49.625537][ T2735] _raw_spin_lock+0x33/0x40 [ 49.625619][ T2735] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 49.625718][ T2735] __ipv6_dev_ac_inc+0x57e/0x930 [ 49.625799][ T2735] addrconf_join_anycast+0x1bc/0x260 [ 49.625883][ T2735] __ipv6_ifa_notify+0x75b/0xad0 [ 49.625968][ T2735] addrconf_dad_completed+0x14b/0xe10 [ 49.626050][ T2735] addrconf_dad_work+0x3c1/0x930 [ 49.626133][ T2735] process_one_work+0xdf8/0x1410 [ 49.626216][ T2735] worker_thread+0x4f1/0xd60 [ 49.626298][ T2735] kthread+0x367/0x460 [ 49.626364][ T2735] ret_from_fork+0x474/0x6b0 [ 49.626446][ T2735] ret_from_fork_asm+0x11/0x20 [ 49.626528][ T2735] } [ 49.626562][ T2735] ... key at: [] acaddr_hash_lock+0x18/0x45a0 [ 49.626661][ T2735] ... acquired at: [ 49.626709][ T2735] mark_lock+0x1d7/0xa00 [ 49.626775][ T2735] mark_usage+0x105/0x170 [ 49.626842][ T2735] __lock_acquire+0x378/0xc10 [ 49.626908][ T2735] lock_acquire.part.0+0xbc/0x260 [ 49.626976][ T2735] _raw_spin_lock+0x33/0x40 [ 49.627041][ T2735] __ipv6_dev_ac_dec+0x236/0x5d0 [ 49.627109][ T2735] addrconf_leave_anycast+0x1bc/0x260 [ 49.627174][ T2735] dev_forward_change+0x3b3/0x850 [ 49.627239][ T2735] addrconf_fixup_forwarding+0x2af/0x4d0 [ 49.627321][ T2735] addrconf_sysctl_forward+0x209/0x2b0 [ 49.627387][ T2735] proc_sys_call_handler+0x31b/0x480 [ 49.627452][ T2735] new_sync_write+0x333/0x750 [ 49.627519][ T2735] vfs_write+0x6a4/0xc10 [ 49.627585][ T2735] ksys_write+0x116/0x250 [ 49.627651][ T2735] do_syscall_64+0x117/0x590 [ 49.627717][ T2735] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 49.627799][ T2735] [ 49.627833][ T2735] [ 49.627833][ T2735] stack backtrace: [ 49.627916][ T2735] CPU: 2 UID: 0 PID: 2735 Comm: sysctl Not tainted 7.1.0-rc5-virtme #1 PREEMPT(full) [ 49.627919][ T2735] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 49.627921][ T2735] Call Trace: [ 49.627922][ T2735] [ 49.627924][ T2735] dump_stack_lvl+0x6f/0xa0 [ 49.627927][ T2735] print_irq_inversion_bug.part.0.cold+0xe6/0x143 [ 49.627930][ T2735] mark_lock_irq+0x989/0x9c0 [ 49.627933][ T2735] mark_lock+0x1d7/0xa00 [ 49.627935][ T2735] mark_usage+0x105/0x170 [ 49.627936][ T2735] __lock_acquire+0x378/0xc10 [ 49.627938][ T2735] lock_acquire.part.0+0xbc/0x260 [ 49.627939][ T2735] ? __ipv6_dev_ac_dec+0x236/0x5d0 [ 49.627941][ T2735] ? rcu_is_watching+0x15/0xd0 [ 49.627944][ T2735] ? do_raw_read_unlock+0x70/0x70 [ 49.627946][ T2735] ? lock_acquire+0x134/0x160 [ 49.627947][ T2735] _raw_spin_lock+0x33/0x40 [ 49.627949][ T2735] ? __ipv6_dev_ac_dec+0x236/0x5d0 [ 49.627950][ T2735] __ipv6_dev_ac_dec+0x236/0x5d0 [ 49.627952][ T2735] addrconf_leave_anycast+0x1bc/0x260 [ 49.627954][ T2735] ? find_held_lock+0x2b/0x80 [ 49.627957][ T2735] ? __ipv6_isatap_ifid+0x210/0x210 [ 49.627962][ T2735] ? mark_held_locks+0x40/0x70 [ 49.627963][ T2735] ? lockdep_hardirqs_on+0x8c/0x130 [ 49.627966][ T2735] dev_forward_change+0x3b3/0x850 [ 49.627968][ T2735] ? addrconf_fixup_forwarding+0x4d/0x4d0 [ 49.627970][ T2735] ? addrconf_sysctl_proxy_ndp+0x2f0/0x2f0 [ 49.627972][ T2735] addrconf_fixup_forwarding+0x2af/0x4d0 [ 49.627975][ T2735] addrconf_sysctl_forward+0x209/0x2b0 [ 49.627977][ T2735] ? addrconf_fixup_forwarding+0x4d0/0x4d0 [ 49.627979][ T2735] ? addrconf_fixup_forwarding+0x4d0/0x4d0 [ 49.627981][ T2735] ? __kvmalloc_node_noprof+0x305/0x8a0 [ 49.627984][ T2735] ? proc_sys_call_handler+0x25d/0x480 [ 49.627986][ T2735] proc_sys_call_handler+0x31b/0x480 [ 49.627988][ T2735] ? proc_sys_lookup+0x3d0/0x3d0 [ 49.627990][ T2735] ? rcu_read_unlock+0x1b/0x70 [ 49.627992][ T2735] ? do_raw_spin_unlock+0x59/0x250 [ 49.627994][ T2735] ? rcu_lockdep_current_cpu_online+0x39/0x1b0 [ 49.627996][ T2735] ? rcu_read_lock_any_held+0x3c/0x90 [ 49.627998][ T2735] ? proc_sys_call_handler+0x480/0x480 [ 49.627999][ T2735] new_sync_write+0x333/0x750 [ 49.628001][ T2735] ? __lock_acquire+0x508/0xc10 [ 49.628002][ T2735] ? new_sync_read+0x740/0x740 [ 49.628004][ T2735] ? lock_acquire.part.0+0xbc/0x260 [ 49.628005][ T2735] ? ksys_write+0x116/0x250 [ 49.628007][ T2735] vfs_write+0x6a4/0xc10 [ 49.628009][ T2735] ksys_write+0x116/0x250 [ 49.628010][ T2735] ? __ia32_sys_read+0xc0/0xc0 [ 49.628012][ T2735] ? rcu_is_watching+0x15/0xd0 [ 49.628013][ T2735] ? rcu_is_watching+0x15/0xd0 [ 49.628015][ T2735] do_syscall_64+0x117/0x590 [ 49.628016][ T2735] ? trace_hardirqs_off+0xd/0x30 [ 49.628019][ T2735] ? exc_page_fault+0xee/0x100 [ 49.628021][ T2735] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 49.628022][ T2735] RIP: 0033:0x7f785098d08e [ 49.628025][ T2735] 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 [ 49.628027][ T2735] RSP: 002b:00007ffeca90ad90 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 49.628030][ T2735] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f785098d08e [ 49.628031][ T2735] RDX: 0000000000000002 RSI: 000055996e5964b0 RDI: 0000000000000005 [ 49.628032][ T2735] RBP: 00007ffeca90ada0 R08: 0000000000000000 R09: 0000000000000000 [ 49.628032][ T2735] R10: 0000000000000000 R11: 0000000000000202 R12: 000055996e5985e0 [ 49.628033][ T2735] R13: 000055996e596470 R14: 0000000000000002 R15: 0000000000000000 [ 49.628035][ T2735]