[ 8.834125][ T185] ip (185) used greatest stack depth: 24496 bytes left [ 9.405125][ T208] ip (208) used greatest stack depth: 23904 bytes left [ 241.808253][ T1833] [ 241.808357][ T1833] ======================================================== [ 241.808561][ T1833] WARNING: possible irq lock inversion dependency detected [ 241.808784][ T1833] 7.1.0-rc5-virtme #1 Not tainted [ 241.808929][ T1833] -------------------------------------------------------- [ 241.809121][ T1833] sysctl/1833 just changed the state of lock: [ 241.809281][ T1833] ffffffffb2f7e8b8 (acaddr_hash_lock){+.+.}-{3:3}, at: __ipv6_dev_ac_dec+0x236/0x5d0 [ 241.809510][ T1833] but this lock was taken by another, SOFTIRQ-READ-safe lock in the past: [ 241.809686][ T1833] (&ndev->lock){++.-}-{3:3} [ 241.809691][ T1833] [ 241.809691][ T1833] [ 241.809691][ T1833] and interrupts could create inverse lock ordering between them. [ 241.809691][ T1833] [ 241.810169][ T1833] [ 241.810169][ T1833] other info that might help us debug this: [ 241.810347][ T1833] Possible interrupt unsafe locking scenario: [ 241.810347][ T1833] [ 241.810537][ T1833] CPU0 CPU1 [ 241.810662][ T1833] ---- ---- [ 241.810795][ T1833] lock(acaddr_hash_lock); [ 241.810935][ T1833] local_irq_disable(); [ 241.811082][ T1833] lock(&ndev->lock); [ 241.811232][ T1833] lock(acaddr_hash_lock); [ 241.811396][ T1833] [ 241.811492][ T1833] lock(&ndev->lock); [ 241.811599][ T1833] [ 241.811599][ T1833] *** DEADLOCK *** [ 241.811599][ T1833] [ 241.811800][ T1833] 2 locks held by sysctl/1833: [ 241.811925][ T1833] #0: ff110000099ec3e0 (sb_writers#3){.+.+}-{0:0}, at: ksys_write+0x116/0x250 [ 241.812139][ T1833] #1: ffffffffb2e8c9c0 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_fixup_forwarding+0x4d/0x4d0 [ 241.812397][ T1833] [ 241.812397][ T1833] the shortest dependencies between 2nd lock and 1st lock: [ 241.812633][ T1833] -> (&ndev->lock){++.-}-{3:3} { [ 241.812772][ T1833] HARDIRQ-ON-W at: [ 241.812866][ T1833] __lock_acquire+0x378/0xc10 [ 241.813025][ T1833] lock_acquire.part.0+0xbc/0x260 [ 241.813175][ T1833] _raw_write_lock_bh+0x38/0x50 [ 241.813323][ T1833] addrconf_permanent_addr+0x108/0x9c0 [ 241.813520][ T1833] addrconf_notify+0x151/0xf30 [ 241.813680][ T1833] notifier_call_chain+0xb0/0x320 [ 241.813835][ T1833] __dev_notify_flags+0xde/0x280 [ 241.813988][ T1833] netif_change_flags+0xfe/0x190 [ 241.814135][ T1833] do_setlink.isra.0+0x1cc3/0x2750 [ 241.814282][ T1833] rtnl_newlink+0x8d1/0xef0 [ 241.814462][ T1833] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 241.814616][ T1833] netlink_rcv_skb+0x14e/0x3a0 [ 241.814785][ T1833] netlink_unicast+0x486/0x750 [ 241.814940][ T1833] netlink_sendmsg+0x735/0xc60 [ 241.815094][ T1833] ____sys_sendmsg+0x419/0x850 [ 241.815247][ T1833] ___sys_sendmsg+0x14e/0x1d0 [ 241.815411][ T1833] __sys_sendmsg+0x145/0x1f0 [ 241.815587][ T1833] do_syscall_64+0x117/0x590 [ 241.815772][ T1833] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 241.815967][ T1833] HARDIRQ-ON-R at: [ 241.816063][ T1833] __lock_acquire+0x378/0xc10 [ 241.816213][ T1833] lock_acquire.part.0+0xbc/0x260 [ 241.816366][ T1833] _raw_read_lock_bh+0x44/0x80 [ 241.816522][ T1833] inet6_fill_ifla6_attrs+0x1aee/0x21e0 [ 241.816698][ T1833] inet6_fill_link_af+0x5c/0xe0 [ 241.816860][ T1833] rtnl_fill_ifinfo.isra.0+0x1a45/0x2c20 [ 241.817074][ T1833] rtnl_getlink+0x9c9/0xeb0 [ 241.817246][ T1833] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 241.817422][ T1833] netlink_rcv_skb+0x14e/0x3a0 [ 241.817656][ T1833] netlink_unicast+0x486/0x750 [ 241.817832][ T1833] netlink_sendmsg+0x735/0xc60 [ 241.817989][ T1833] ____sys_sendmsg+0x419/0x850 [ 241.818146][ T1833] ___sys_sendmsg+0x14e/0x1d0 [ 241.818376][ T1833] __sys_sendmsg+0x145/0x1f0 [ 241.818532][ T1833] do_syscall_64+0x117/0x590 [ 241.818683][ T1833] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 241.818946][ T1833] IN-SOFTIRQ-R at: [ 241.819038][ T1833] __lock_acquire+0x378/0xc10 [ 241.819190][ T1833] lock_acquire.part.0+0xbc/0x260 [ 241.819422][ T1833] _raw_read_lock_bh+0x44/0x80 [ 241.819595][ T1833] ipv6_get_lladdr+0xa8/0x3f0 [ 241.819779][ T1833] ndisc_send_ns+0xf3/0x120 [ 241.820016][ T1833] ndisc_solicit+0x314/0x480 [ 241.820171][ T1833] neigh_probe+0xb3/0x100 [ 241.820330][ T1833] __neigh_event_send+0x802/0x1070 [ 241.820486][ T1833] neigh_resolve_output+0xbe/0x140 [ 241.820717][ T1833] ip6_finish_output2+0x423/0x1300 [ 241.820872][ T1833] ip6_finish_output+0x646/0xda0 [ 241.821022][ T1833] ip6_output+0x23f/0x7f0 [ 241.821260][ T1833] ip6_forward+0x10f4/0x2bd0 [ 241.821428][ T1833] ipv6_rcv+0x3c1/0x5a0 [ 241.821587][ T1833] __netif_receive_skb_one_core+0xfc/0x180 [ 241.821862][ T1833] process_backlog+0x2bc/0x1490 [ 241.822015][ T1833] __napi_poll+0xa7/0x3b0 [ 241.822176][ T1833] net_rx_action+0x513/0xf50 [ 241.822396][ T1833] handle_softirqs+0x1d8/0x940 [ 241.822550][ T1833] do_softirq+0xa9/0xe0 [ 241.822702][ T1833] __local_bh_enable_ip+0x113/0x140 [ 241.822943][ T1833] __neigh_event_send+0x30a/0x1070 [ 241.823098][ T1833] neigh_resolve_output+0xbe/0x140 [ 241.823252][ T1833] ip6_finish_output2+0x423/0x1300 [ 241.823485][ T1833] ip6_finish_output+0x646/0xda0 [ 241.823646][ T1833] ip6_output+0x23f/0x7f0 [ 241.823806][ T1833] ip6_send_skb+0xee/0x350 [ 241.823954][ T1833] rawv6_push_pending_frames+0x4cb/0xa90 [ 241.824210][ T1833] rawv6_sendmsg+0x1434/0x1a50 [ 241.824369][ T1833] __sys_sendto+0x2c9/0x400 [ 241.824547][ T1833] __x64_sys_sendto+0xe4/0x1f0 [ 241.824795][ T1833] do_syscall_64+0x117/0x590 [ 241.824955][ T1833] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 241.825140][ T1833] INITIAL USE at: [ 241.825309][ T1833] __lock_acquire+0x378/0xc10 [ 241.825470][ T1833] lock_acquire.part.0+0xbc/0x260 [ 241.825624][ T1833] _raw_write_lock_bh+0x38/0x50 [ 241.825848][ T1833] addrconf_permanent_addr+0x108/0x9c0 [ 241.826035][ T1833] addrconf_notify+0x151/0xf30 [ 241.826196][ T1833] notifier_call_chain+0xb0/0x320 [ 241.826427][ T1833] __dev_notify_flags+0xde/0x280 [ 241.826581][ T1833] netif_change_flags+0xfe/0x190 [ 241.826732][ T1833] do_setlink.isra.0+0x1cc3/0x2750 [ 241.826881][ T1833] rtnl_newlink+0x8d1/0xef0 [ 241.827031][ T1833] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 241.827187][ T1833] netlink_rcv_skb+0x14e/0x3a0 [ 241.827343][ T1833] netlink_unicast+0x486/0x750 [ 241.827582][ T1833] netlink_sendmsg+0x735/0xc60 [ 241.827736][ T1833] ____sys_sendmsg+0x419/0x850 [ 241.827889][ T1833] ___sys_sendmsg+0x14e/0x1d0 [ 241.828130][ T1833] __sys_sendmsg+0x145/0x1f0 [ 241.828315][ T1833] do_syscall_64+0x117/0x590 [ 241.828475][ T1833] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 241.828743][ T1833] INITIAL READ USE at: [ 241.828869][ T1833] __lock_acquire+0x378/0xc10 [ 241.829047][ T1833] lock_acquire.part.0+0xbc/0x260 [ 241.829320][ T1833] _raw_read_lock_bh+0x44/0x80 [ 241.829471][ T1833] inet6_fill_ifla6_attrs+0x1aee/0x21e0 [ 241.829654][ T1833] inet6_fill_link_af+0x5c/0xe0 [ 241.829883][ T1833] rtnl_fill_ifinfo.isra.0+0x1a45/0x2c20 [ 241.830065][ T1833] rtnl_getlink+0x9c9/0xeb0 [ 241.830239][ T1833] rtnetlink_rcv_msg+0x6fd/0xbd0 [ 241.830470][ T1833] netlink_rcv_skb+0x14e/0x3a0 [ 241.830652][ T1833] netlink_unicast+0x486/0x750 [ 241.830808][ T1833] netlink_sendmsg+0x735/0xc60 [ 241.831045][ T1833] ____sys_sendmsg+0x419/0x850 [ 241.831194][ T1833] ___sys_sendmsg+0x14e/0x1d0 [ 241.831346][ T1833] __sys_sendmsg+0x145/0x1f0 [ 241.831568][ T1833] do_syscall_64+0x117/0x590 [ 241.831731][ T1833] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 241.831916][ T1833] } [ 241.831992][ T1833] ... key at: [] __key.37+0x0/0x40 [ 241.832267][ T1833] ... acquired at: [ 241.832364][ T1833] __lock_acquire+0x508/0xc10 [ 241.832486][ T1833] lock_acquire.part.0+0xbc/0x260 [ 241.832605][ T1833] _raw_spin_lock+0x33/0x40 [ 241.832760][ T1833] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 241.832862][ T1833] __ipv6_dev_ac_inc+0x57e/0x930 [ 241.832949][ T1833] addrconf_join_anycast+0x1bc/0x260 [ 241.833059][ T1833] __ipv6_ifa_notify+0x75b/0xad0 [ 241.833289][ T1833] addrconf_dad_completed+0x14b/0xe10 [ 241.833422][ T1833] addrconf_dad_work+0x3c1/0x930 [ 241.833545][ T1833] process_one_work+0xdf8/0x1410 [ 241.833668][ T1833] worker_thread+0x4f1/0xd60 [ 241.833871][ T1833] kthread+0x367/0x460 [ 241.833961][ T1833] ret_from_fork+0x474/0x6b0 [ 241.834084][ T1833] ret_from_fork_asm+0x11/0x20 [ 241.834204][ T1833] [ 241.834340][ T1833] -> (acaddr_hash_lock){+.+.}-{3:3} { [ 241.834466][ T1833] HARDIRQ-ON-W at: [ 241.834557][ T1833] __lock_acquire+0x378/0xc10 [ 241.834711][ T1833] lock_acquire.part.0+0xbc/0x260 [ 241.834952][ T1833] _raw_spin_lock+0x33/0x40 [ 241.835104][ T1833] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 241.835290][ T1833] __ipv6_dev_ac_inc+0x57e/0x930 [ 241.835524][ T1833] addrconf_join_anycast+0x1bc/0x260 [ 241.835688][ T1833] __ipv6_ifa_notify+0x75b/0xad0 [ 241.835847][ T1833] addrconf_dad_completed+0x14b/0xe10 [ 241.836098][ T1833] addrconf_dad_work+0x3c1/0x930 [ 241.836262][ T1833] process_one_work+0xdf8/0x1410 [ 241.836416][ T1833] worker_thread+0x4f1/0xd60 [ 241.836569][ T1833] kthread+0x367/0x460 [ 241.836775][ T1833] ret_from_fork+0x474/0x6b0 [ 241.836940][ T1833] ret_from_fork_asm+0x11/0x20 [ 241.837094][ T1833] SOFTIRQ-ON-W at: [ 241.837267][ T1833] __lock_acquire+0x378/0xc10 [ 241.837417][ T1833] lock_acquire.part.0+0xbc/0x260 [ 241.837596][ T1833] _raw_spin_lock+0x33/0x40 [ 241.837750][ T1833] __ipv6_dev_ac_dec+0x236/0x5d0 [ 241.837978][ T1833] addrconf_leave_anycast+0x1bc/0x260 [ 241.838121][ T1833] dev_forward_change+0x3b3/0x850 [ 241.838268][ T1833] addrconf_fixup_forwarding+0x2af/0x4d0 [ 241.838553][ T1833] addrconf_sysctl_forward+0x209/0x2b0 [ 241.838705][ T1833] proc_sys_call_handler+0x31b/0x480 [ 241.838867][ T1833] new_sync_write+0x333/0x750 [ 241.839093][ T1833] vfs_write+0x6a4/0xc10 [ 241.839242][ T1833] ksys_write+0x116/0x250 [ 241.839391][ T1833] do_syscall_64+0x117/0x590 [ 241.839618][ T1833] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 241.839805][ T1833] INITIAL USE at: [ 241.839897][ T1833] __lock_acquire+0x378/0xc10 [ 241.840118][ T1833] lock_acquire.part.0+0xbc/0x260 [ 241.840278][ T1833] _raw_spin_lock+0x33/0x40 [ 241.840426][ T1833] ipv6_add_acaddr_hash.isra.0+0x16d/0x350 [ 241.840707][ T1833] __ipv6_dev_ac_inc+0x57e/0x930 [ 241.840880][ T1833] addrconf_join_anycast+0x1bc/0x260 [ 241.841028][ T1833] __ipv6_ifa_notify+0x75b/0xad0 [ 241.841182][ T1833] addrconf_dad_completed+0x14b/0xe10 [ 241.841408][ T1833] addrconf_dad_work+0x3c1/0x930 [ 241.841571][ T1833] process_one_work+0xdf8/0x1410 [ 241.841736][ T1833] worker_thread+0x4f1/0xd60 [ 241.841966][ T1833] kthread+0x367/0x460 [ 241.842094][ T1833] ret_from_fork+0x474/0x6b0 [ 241.842253][ T1833] ret_from_fork_asm+0x11/0x20 [ 241.842477][ T1833] } [ 241.842540][ T1833] ... key at: [] acaddr_hash_lock+0x18/0x45a0 [ 241.842735][ T1833] ... acquired at: [ 241.842825][ T1833] mark_lock+0x1d7/0xa00 [ 241.843050][ T1833] mark_usage+0x105/0x170 [ 241.843178][ T1833] __lock_acquire+0x378/0xc10 [ 241.843298][ T1833] lock_acquire.part.0+0xbc/0x260 [ 241.843417][ T1833] _raw_spin_lock+0x33/0x40 [ 241.843633][ T1833] __ipv6_dev_ac_dec+0x236/0x5d0 [ 241.843762][ T1833] addrconf_leave_anycast+0x1bc/0x260 [ 241.843906][ T1833] dev_forward_change+0x3b3/0x850 [ 241.844033][ T1833] addrconf_fixup_forwarding+0x2af/0x4d0 [ 241.844262][ T1833] addrconf_sysctl_forward+0x209/0x2b0 [ 241.844388][ T1833] proc_sys_call_handler+0x31b/0x480 [ 241.844520][ T1833] new_sync_write+0x333/0x750 [ 241.844638][ T1833] vfs_write+0x6a4/0xc10 [ 241.844835][ T1833] ksys_write+0x116/0x250 [ 241.844960][ T1833] do_syscall_64+0x117/0x590 [ 241.845080][ T1833] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 241.845229][ T1833] [ 241.845361][ T1833] [ 241.845361][ T1833] stack backtrace: [ 241.845516][ T1833] CPU: 1 UID: 0 PID: 1833 Comm: sysctl Not tainted 7.1.0-rc5-virtme #1 PREEMPT(full) [ 241.845520][ T1833] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 241.845523][ T1833] Call Trace: [ 241.845525][ T1833] [ 241.845527][ T1833] dump_stack_lvl+0x6f/0xa0 [ 241.845532][ T1833] print_irq_inversion_bug.part.0.cold+0xe6/0x143 [ 241.845537][ T1833] mark_lock_irq+0x989/0x9c0 [ 241.845542][ T1833] mark_lock+0x1d7/0xa00 [ 241.845545][ T1833] mark_usage+0x105/0x170 [ 241.845547][ T1833] __lock_acquire+0x378/0xc10 [ 241.845550][ T1833] ? alloc_chain_hlocks+0x5a/0x5d0 [ 241.845553][ T1833] lock_acquire.part.0+0xbc/0x260 [ 241.845556][ T1833] ? __ipv6_dev_ac_dec+0x236/0x5d0 [ 241.845558][ T1833] ? rcu_is_watching+0x15/0xd0 [ 241.845562][ T1833] ? do_raw_read_unlock+0x70/0x70 [ 241.845565][ T1833] ? lock_acquire+0x134/0x160 [ 241.845568][ T1833] _raw_spin_lock+0x33/0x40 [ 241.845570][ T1833] ? __ipv6_dev_ac_dec+0x236/0x5d0 [ 241.845573][ T1833] __ipv6_dev_ac_dec+0x236/0x5d0 [ 241.845576][ T1833] addrconf_leave_anycast+0x1bc/0x260 [ 241.845580][ T1833] ? __ipv6_isatap_ifid+0x210/0x210 [ 241.845582][ T1833] ? preempt_schedule_thunk+0x16/0x30 [ 241.845586][ T1833] ? __local_bh_enable_ip+0xa5/0x140 [ 241.845590][ T1833] dev_forward_change+0x3b3/0x850 [ 241.845593][ T1833] ? addrconf_fixup_forwarding+0x4d/0x4d0 [ 241.845597][ T1833] ? addrconf_sysctl_proxy_ndp+0x2f0/0x2f0 [ 241.845601][ T1833] addrconf_fixup_forwarding+0x2af/0x4d0 [ 241.845605][ T1833] addrconf_sysctl_forward+0x209/0x2b0 [ 241.845608][ T1833] ? addrconf_fixup_forwarding+0x4d0/0x4d0 [ 241.845612][ T1833] ? addrconf_fixup_forwarding+0x4d0/0x4d0 [ 241.845615][ T1833] ? __kvmalloc_node_noprof+0x305/0x8a0 [ 241.845619][ T1833] ? proc_sys_call_handler+0x25d/0x480 [ 241.845624][ T1833] proc_sys_call_handler+0x31b/0x480 [ 241.845627][ T1833] ? proc_sys_lookup+0x3d0/0x3d0 [ 241.845630][ T1833] ? rcu_read_unlock+0x1b/0x70 [ 241.845634][ T1833] ? do_raw_spin_unlock+0x59/0x250 [ 241.845636][ T1833] ? rcu_lockdep_current_cpu_online+0x39/0x1b0 [ 241.845639][ T1833] ? rcu_read_lock_any_held+0x3c/0x90 [ 241.845642][ T1833] ? proc_sys_call_handler+0x480/0x480 [ 241.845645][ T1833] new_sync_write+0x333/0x750 [ 241.845648][ T1833] ? __lock_acquire+0x508/0xc10 [ 241.845650][ T1833] ? new_sync_read+0x740/0x740 [ 241.845653][ T1833] ? lock_acquire.part.0+0xbc/0x260 [ 241.845655][ T1833] ? ksys_write+0x116/0x250 [ 241.845660][ T1833] vfs_write+0x6a4/0xc10 [ 241.845663][ T1833] ksys_write+0x116/0x250 [ 241.845665][ T1833] ? __ia32_sys_read+0xc0/0xc0 [ 241.845668][ T1833] ? rcu_is_watching+0x15/0xd0 [ 241.845670][ T1833] ? rcu_is_watching+0x15/0xd0 [ 241.845674][ T1833] do_syscall_64+0x117/0x590 [ 241.845676][ T1833] ? trace_hardirqs_off+0xd/0x30 [ 241.845680][ T1833] ? exc_page_fault+0xee/0x100 [ 241.845684][ T1833] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 241.845686][ T1833] RIP: 0033:0x7fcb4290e08e [ 241.845690][ T1833] 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 [ 241.845693][ T1833] RSP: 002b:00007ffeb488da00 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 241.845698][ T1833] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fcb4290e08e [ 241.845700][ T1833] RDX: 0000000000000002 RSI: 000055d0f32634b0 RDI: 0000000000000005 [ 241.845701][ T1833] RBP: 00007ffeb488da10 R08: 0000000000000000 R09: 0000000000000000 [ 241.845703][ T1833] R10: 0000000000000000 R11: 0000000000000202 R12: 000055d0f32655e0 [ 241.845704][ T1833] R13: 000055d0f3263470 R14: 0000000000000002 R15: 0000000000000000 [ 241.845708][ T1833]