[ 8.463010][ T186] ip (186) used greatest stack depth: 24640 bytes left [ 8.577782][ T192] ip (192) used greatest stack depth: 23904 bytes left [ 9.134861][ T213] 8021q: 802.1Q VLAN Support v1.8 [ 17.191986][ T295] [ 17.192074][ T295] ======================================================== [ 17.192195][ T295] WARNING: possible irq lock inversion dependency detected [ 17.192313][ T295] 7.1.0-rc5-virtme #1 Not tainted [ 17.192396][ T295] -------------------------------------------------------- [ 17.192513][ T295] sysctl/295 just changed the state of lock: [ 17.192608][ T295] ffffffff8837e8b8 (acaddr_hash_lock){+.+.}-{3:3}, at: __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.192752][ T295] but this lock was taken by another, SOFTIRQ-READ-safe lock in the past: [ 17.192868][ T295] (&ndev->lock){++.-}-{3:3} [ 17.192871][ T295] [ 17.192871][ T295] [ 17.192871][ T295] and interrupts could create inverse lock ordering between them. [ 17.192871][ T295] [ 17.193149][ T295] [ 17.193149][ T295] other info that might help us debug this: [ 17.193263][ T295] Possible interrupt unsafe locking scenario: [ 17.193263][ T295] [ 17.193385][ T295] CPU0 CPU1 [ 17.193465][ T295] ---- ---- [ 17.193543][ T295] lock(acaddr_hash_lock); [ 17.193626][ T295] local_irq_disable(); [ 17.193721][ T295] lock(&ndev->lock); [ 17.193818][ T295] lock(acaddr_hash_lock); [ 17.193916][ T295] [ 17.193973][ T295] lock(&ndev->lock); [ 17.194033][ T295] [ 17.194033][ T295] *** DEADLOCK *** [ 17.194033][ T295] [ 17.194147][ T295] 2 locks held by sysctl/295: [ 17.194225][ T295] #0: ff11000009b613e0 (sb_writers#3){.+.+}-{0:0}, at: ksys_write+0x116/0x250 [ 17.194373][ T295] #1: ffffffff8828c9c0 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_fixup_forwarding+0x4d/0x4d0 [ 17.194529][ T295] [ 17.194529][ T295] the shortest dependencies between 2nd lock and 1st lock: [ 17.194669][ T295] -> (&ndev->lock){++.-}-{3:3} { [ 17.194751][ T295] HARDIRQ-ON-W at: [ 17.194811][ T295] __lock_acquire+0x378/0xc10 [ 17.194912][ T295] lock_acquire.part.0+0xbc/0x260 [ 17.195011][ T295] _raw_write_lock_bh+0x38/0x50 [ 17.195110][ T295] addrconf_permanent_addr+0x108/0x9c0 [ 17.195225][ T295] addrconf_notify+0x151/0xf30 [ 17.195326][ T295] notifier_call_chain+0xb0/0x320 [ 17.195431][ T295] __dev_notify_flags+0xde/0x280 [ 17.195529][ T295] netif_change_flags+0xfe/0x190 [ 17.195625][ T295] do_setlink.isra.0+0x1cc3/0x2750 [ 17.195765][ T295] rtnl_newlink+0x8d1/0xef0 [ 17.195862][ T295] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 17.195957][ T295] netlink_rcv_skb+0x14e/0x3a0 [ 17.196100][ T295] netlink_unicast+0x486/0x750 [ 17.196197][ T295] netlink_sendmsg+0x735/0xc60 [ 17.196294][ T295] ____sys_sendmsg+0x419/0x850 [ 17.196444][ T295] ___sys_sendmsg+0x14e/0x1d0 [ 17.196543][ T295] __sys_sendmsg+0x145/0x1f0 [ 17.196640][ T295] do_syscall_64+0x117/0x590 [ 17.196780][ T295] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.196897][ T295] HARDIRQ-ON-R at: [ 17.196955][ T295] __lock_acquire+0x378/0xc10 [ 17.197052][ T295] lock_acquire.part.0+0xbc/0x260 [ 17.197190][ T295] _raw_read_lock_bh+0x44/0x80 [ 17.197288][ T295] inet6_fill_ifla6_attrs+0x1aee/0x21e0 [ 17.197412][ T295] inet6_fill_link_af+0x5c/0xe0 [ 17.197549][ T295] rtnl_fill_ifinfo.isra.0+0x1a45/0x2c20 [ 17.197663][ T295] rtnl_getlink+0x9c9/0xeb0 [ 17.197759][ T295] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 17.197897][ T295] netlink_rcv_skb+0x14e/0x3a0 [ 17.197992][ T295] netlink_unicast+0x486/0x750 [ 17.198087][ T295] netlink_sendmsg+0x735/0xc60 [ 17.198225][ T295] ____sys_sendmsg+0x419/0x850 [ 17.198324][ T295] ___sys_sendmsg+0x14e/0x1d0 [ 17.198427][ T295] __sys_sendmsg+0x145/0x1f0 [ 17.198563][ T295] do_syscall_64+0x117/0x590 [ 17.198658][ T295] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.198775][ T295] IN-SOFTIRQ-R at: [ 17.198874][ T295] __lock_acquire+0x378/0xc10 [ 17.198968][ T295] lock_acquire.part.0+0xbc/0x260 [ 17.199064][ T295] _raw_read_lock_bh+0x44/0x80 [ 17.199160][ T295] ipv6_get_lladdr+0xa8/0x3f0 [ 17.199296][ T295] ndisc_send_ns+0xf3/0x120 [ 17.199405][ T295] ndisc_solicit+0x314/0x480 [ 17.199501][ T295] neigh_probe+0xb3/0x100 [ 17.199640][ T295] __neigh_event_send+0x802/0x1070 [ 17.199735][ T295] neigh_resolve_output+0xbe/0x140 [ 17.199831][ T295] ip6_finish_output2+0x423/0x1300 [ 17.199966][ T295] ip6_finish_output+0x646/0xda0 [ 17.200061][ T295] ip6_output+0x23f/0x7f0 [ 17.200157][ T295] ip6_forward+0x10f4/0x2bd0 [ 17.200295][ T295] ipv6_rcv+0x3c1/0x5a0 [ 17.200401][ T295] __netif_receive_skb_one_core+0xfc/0x180 [ 17.200516][ T295] process_backlog+0x2bc/0x1490 [ 17.200651][ T295] __napi_poll+0xa7/0x3b0 [ 17.200746][ T295] net_rx_action+0x513/0xf50 [ 17.200844][ T295] handle_softirqs+0x1d8/0x940 [ 17.200981][ T295] do_softirq+0xa9/0xe0 [ 17.201079][ T295] __local_bh_enable_ip+0x113/0x140 [ 17.201175][ T295] __neigh_event_send+0x30a/0x1070 [ 17.201270][ T295] neigh_resolve_output+0xbe/0x140 [ 17.201416][ T295] ip6_finish_output2+0x423/0x1300 [ 17.201513][ T295] ip6_finish_output+0x646/0xda0 [ 17.201608][ T295] ip6_output+0x23f/0x7f0 [ 17.201743][ T295] ip6_send_skb+0xee/0x350 [ 17.201840][ T295] rawv6_push_pending_frames+0x4cb/0xa90 [ 17.201955][ T295] rawv6_sendmsg+0x1434/0x1a50 [ 17.202092][ T295] __sys_sendto+0x2c9/0x400 [ 17.202187][ T295] __x64_sys_sendto+0xe4/0x1f0 [ 17.202282][ T295] do_syscall_64+0x117/0x590 [ 17.202427][ T295] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.202541][ T295] INITIAL USE at: [ 17.202598][ T295] __lock_acquire+0x378/0xc10 [ 17.202735][ T295] lock_acquire.part.0+0xbc/0x260 [ 17.202829][ T295] _raw_write_lock_bh+0x38/0x50 [ 17.202924][ T295] addrconf_permanent_addr+0x108/0x9c0 [ 17.203079][ T295] addrconf_notify+0x151/0xf30 [ 17.203174][ T295] notifier_call_chain+0xb0/0x320 [ 17.203270][ T295] __dev_notify_flags+0xde/0x280 [ 17.203372][ T295] netif_change_flags+0xfe/0x190 [ 17.203509][ T295] do_setlink.isra.0+0x1cc3/0x2750 [ 17.203604][ T295] rtnl_newlink+0x8d1/0xef0 [ 17.203699][ T295] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 17.203837][ T295] netlink_rcv_skb+0x14e/0x3a0 [ 17.203933][ T295] netlink_unicast+0x486/0x750 [ 17.204029][ T295] netlink_sendmsg+0x735/0xc60 [ 17.204167][ T295] ____sys_sendmsg+0x419/0x850 [ 17.204262][ T295] ___sys_sendmsg+0x14e/0x1d0 [ 17.204369][ T295] __sys_sendmsg+0x145/0x1f0 [ 17.204506][ T295] do_syscall_64+0x117/0x590 [ 17.204601][ T295] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.204715][ T295] INITIAL READ USE at: [ 17.204831][ T295] __lock_acquire+0x378/0xc10 [ 17.204926][ T295] lock_acquire.part.0+0xbc/0x260 [ 17.205043][ T295] _raw_read_lock_bh+0x44/0x80 [ 17.205180][ T295] inet6_fill_ifla6_attrs+0x1aee/0x21e0 [ 17.205295][ T295] inet6_fill_link_af+0x5c/0xe0 [ 17.205401][ T295] rtnl_fill_ifinfo.isra.0+0x1a45/0x2c20 [ 17.205555][ T295] rtnl_getlink+0x9c9/0xeb0 [ 17.205653][ T295] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 17.205749][ T295] netlink_rcv_skb+0x14e/0x3a0 [ 17.205886][ T295] netlink_unicast+0x486/0x750 [ 17.205982][ T295] netlink_sendmsg+0x735/0xc60 [ 17.206079][ T295] ____sys_sendmsg+0x419/0x850 [ 17.206175][ T295] ___sys_sendmsg+0x14e/0x1d0 [ 17.206312][ T295] __sys_sendmsg+0x145/0x1f0 [ 17.206414][ T295] do_syscall_64+0x117/0x590 [ 17.206510][ T295] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.206666][ T295] } [ 17.206707][ T295] ... key at: [] __key.37+0x0/0x40 [ 17.206825][ T295] ... acquired at: [ 17.206883][ T295] __lock_acquire+0x508/0xc10 [ 17.207001][ T295] lock_acquire.part.0+0xbc/0x260 [ 17.207078][ T295] _raw_spin_lock+0x33/0x40 [ 17.207156][ T295] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 17.207291][ T295] __ipv6_dev_ac_inc+0x57e/0x930 [ 17.207375][ T295] addrconf_join_anycast+0x1bc/0x260 [ 17.207452][ T295] __ipv6_ifa_notify+0x75b/0xad0 [ 17.207529][ T295] addrconf_dad_completed+0x14b/0xe10 [ 17.207646][ T295] addrconf_dad_work+0x3c1/0x930 [ 17.207722][ T295] process_one_work+0xdf8/0x1410 [ 17.207799][ T295] worker_thread+0x4f1/0xd60 [ 17.207876][ T295] kthread+0x367/0x460 [ 17.207935][ T295] ret_from_fork+0x474/0x6b0 [ 17.208052][ T295] ret_from_fork_asm+0x11/0x20 [ 17.208131][ T295] [ 17.208171][ T295] -> (acaddr_hash_lock){+.+.}-{3:3} { [ 17.208249][ T295] HARDIRQ-ON-W at: [ 17.208351][ T295] __lock_acquire+0x378/0xc10 [ 17.208448][ T295] lock_acquire.part.0+0xbc/0x260 [ 17.208544][ T295] _raw_spin_lock+0x33/0x40 [ 17.208638][ T295] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 17.208792][ T295] __ipv6_dev_ac_inc+0x57e/0x930 [ 17.208888][ T295] addrconf_join_anycast+0x1bc/0x260 [ 17.208984][ T295] __ipv6_ifa_notify+0x75b/0xad0 [ 17.209121][ T295] addrconf_dad_completed+0x14b/0xe10 [ 17.209219][ T295] addrconf_dad_work+0x3c1/0x930 [ 17.209318][ T295] process_one_work+0xdf8/0x1410 [ 17.209458][ T295] worker_thread+0x4f1/0xd60 [ 17.209554][ T295] kthread+0x367/0x460 [ 17.209630][ T295] ret_from_fork+0x474/0x6b0 [ 17.209765][ T295] ret_from_fork_asm+0x11/0x20 [ 17.209860][ T295] SOFTIRQ-ON-W at: [ 17.209917][ T295] __lock_acquire+0x378/0xc10 [ 17.210012][ T295] lock_acquire.part.0+0xbc/0x260 [ 17.210147][ T295] _raw_spin_lock+0x33/0x40 [ 17.210243][ T295] __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.210348][ T295] addrconf_leave_anycast+0x1bc/0x260 [ 17.210443][ T295] dev_forward_change+0x3b3/0x850 [ 17.210539][ T295] addrconf_fixup_forwarding+0x2af/0x4d0 [ 17.210651][ T295] addrconf_sysctl_forward+0x209/0x2b0 [ 17.210787][ T295] proc_sys_call_handler+0x31b/0x480 [ 17.210885][ T295] new_sync_write+0x333/0x750 [ 17.210982][ T295] vfs_write+0x6a4/0xc10 [ 17.211118][ T295] ksys_write+0x116/0x250 [ 17.211213][ T295] do_syscall_64+0x117/0x590 [ 17.211310][ T295] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.211430][ T295] INITIAL USE at: [ 17.211488][ T295] __lock_acquire+0x378/0xc10 [ 17.211584][ T295] lock_acquire.part.0+0xbc/0x260 [ 17.211677][ T295] _raw_spin_lock+0x33/0x40 [ 17.211812][ T295] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 17.211927][ T295] __ipv6_dev_ac_inc+0x57e/0x930 [ 17.212022][ T295] addrconf_join_anycast+0x1bc/0x260 [ 17.212158][ T295] __ipv6_ifa_notify+0x75b/0xad0 [ 17.212253][ T295] addrconf_dad_completed+0x14b/0xe10 [ 17.212356][ T295] addrconf_dad_work+0x3c1/0x930 [ 17.212493][ T295] process_one_work+0xdf8/0x1410 [ 17.212588][ T295] worker_thread+0x4f1/0xd60 [ 17.212684][ T295] kthread+0x367/0x460 [ 17.212801][ T295] ret_from_fork+0x474/0x6b0 [ 17.212898][ T295] ret_from_fork_asm+0x11/0x20 [ 17.212993][ T295] } [ 17.213031][ T295] ... key at: [] acaddr_hash_lock+0x18/0x45a0 [ 17.213185][ T295] ... acquired at: [ 17.213243][ T295] mark_lock+0x1d7/0xa00 [ 17.213324][ T295] mark_usage+0x105/0x170 [ 17.213405][ T295] __lock_acquire+0x378/0xc10 [ 17.213523][ T295] lock_acquire.part.0+0xbc/0x260 [ 17.213598][ T295] _raw_spin_lock+0x33/0x40 [ 17.213674][ T295] __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.213749][ T295] addrconf_leave_anycast+0x1bc/0x260 [ 17.213865][ T295] dev_forward_change+0x3b3/0x850 [ 17.213966][ T295] addrconf_fixup_forwarding+0x2af/0x4d0 [ 17.214063][ T295] addrconf_sysctl_forward+0x209/0x2b0 [ 17.214140][ T295] proc_sys_call_handler+0x31b/0x480 [ 17.214256][ T295] new_sync_write+0x333/0x750 [ 17.214340][ T295] vfs_write+0x6a4/0xc10 [ 17.214416][ T295] ksys_write+0x116/0x250 [ 17.214492][ T295] do_syscall_64+0x117/0x590 [ 17.214609][ T295] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.214703][ T295] [ 17.214741][ T295] [ 17.214741][ T295] stack backtrace: [ 17.214836][ T295] CPU: 2 UID: 0 PID: 295 Comm: sysctl Not tainted 7.1.0-rc5-virtme #1 PREEMPT(full) [ 17.214838][ T295] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 17.214840][ T295] Call Trace: [ 17.214842][ T295] [ 17.214843][ T295] dump_stack_lvl+0x6f/0xa0 [ 17.214847][ T295] print_irq_inversion_bug.part.0.cold+0xe6/0x143 [ 17.214850][ T295] mark_lock_irq+0x989/0x9c0 [ 17.214853][ T295] mark_lock+0x1d7/0xa00 [ 17.214854][ T295] mark_usage+0x105/0x170 [ 17.214856][ T295] __lock_acquire+0x378/0xc10 [ 17.214858][ T295] lock_acquire.part.0+0xbc/0x260 [ 17.214859][ T295] ? __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.214861][ T295] ? rcu_is_watching+0x15/0xd0 [ 17.214864][ T295] ? do_raw_read_unlock+0x70/0x70 [ 17.214866][ T295] ? lock_acquire+0x134/0x160 [ 17.214867][ T295] _raw_spin_lock+0x33/0x40 [ 17.214869][ T295] ? __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.214870][ T295] __ipv6_dev_ac_dec+0x236/0x5d0 [ 17.214872][ T295] addrconf_leave_anycast+0x1bc/0x260 [ 17.214874][ T295] ? find_held_lock+0x2b/0x80 [ 17.214877][ T295] ? __ipv6_isatap_ifid+0x210/0x210 [ 17.214879][ T295] ? mark_held_locks+0x40/0x70 [ 17.214880][ T295] ? lockdep_hardirqs_on+0x8c/0x130 [ 17.214883][ T295] dev_forward_change+0x3b3/0x850 [ 17.214885][ T295] ? addrconf_fixup_forwarding+0x4d/0x4d0 [ 17.214887][ T295] ? addrconf_sysctl_proxy_ndp+0x2f0/0x2f0 [ 17.214889][ T295] addrconf_fixup_forwarding+0x2af/0x4d0 [ 17.214892][ T295] addrconf_sysctl_forward+0x209/0x2b0 [ 17.214894][ T295] ? addrconf_fixup_forwarding+0x4d0/0x4d0 [ 17.214896][ T295] ? addrconf_fixup_forwarding+0x4d0/0x4d0 [ 17.214898][ T295] ? __kvmalloc_node_noprof+0x305/0x8a0 [ 17.214901][ T295] ? proc_sys_call_handler+0x25d/0x480 [ 17.214904][ T295] proc_sys_call_handler+0x31b/0x480 [ 17.214906][ T295] ? proc_sys_lookup+0x3d0/0x3d0 [ 17.214908][ T295] ? rcu_read_unlock+0x1b/0x70 [ 17.214910][ T295] ? do_raw_spin_unlock+0x59/0x250 [ 17.214912][ T295] ? rcu_lockdep_current_cpu_online+0x39/0x1b0 [ 17.214914][ T295] ? rcu_read_lock_any_held+0x3c/0x90 [ 17.214916][ T295] ? proc_sys_call_handler+0x480/0x480 [ 17.214918][ T295] new_sync_write+0x333/0x750 [ 17.214919][ T295] ? __lock_acquire+0x508/0xc10 [ 17.214921][ T295] ? new_sync_read+0x740/0x740 [ 17.214922][ T295] ? lock_acquire.part.0+0xbc/0x260 [ 17.214924][ T295] ? ksys_write+0x116/0x250 [ 17.214926][ T295] vfs_write+0x6a4/0xc10 [ 17.214928][ T295] ksys_write+0x116/0x250 [ 17.214929][ T295] ? __ia32_sys_read+0xc0/0xc0 [ 17.214930][ T295] ? rcu_is_watching+0x15/0xd0 [ 17.214932][ T295] ? rcu_is_watching+0x15/0xd0 [ 17.214934][ T295] do_syscall_64+0x117/0x590 [ 17.214935][ T295] ? trace_hardirqs_off+0xd/0x30 [ 17.214938][ T295] ? exc_page_fault+0xee/0x100 [ 17.214940][ T295] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 17.214941][ T295] RIP: 0033:0x7f77373ed08e [ 17.214944][ T295] 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 [ 17.214946][ T295] RSP: 002b:00007ffea6a45060 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 17.214949][ T295] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f77373ed08e [ 17.214950][ T295] RDX: 0000000000000002 RSI: 000055f36914c4b0 RDI: 0000000000000005 [ 17.214951][ T295] RBP: 00007ffea6a45070 R08: 0000000000000000 R09: 0000000000000000 [ 17.214952][ T295] R10: 0000000000000000 R11: 0000000000000202 R12: 000055f36914e5e0 [ 17.214952][ T295] R13: 000055f36914c470 R14: 0000000000000002 R15: 0000000000000000 [ 17.214955][ T295]