[ 31.050595][ T309] gre: GRE over IPv4 demultiplexor driver [ 31.097363][ T309] ip6_gre: GRE over IPv6 tunneling driver [ 33.242267][ T330] 8021q: 802.1Q VLAN Support v1.8 [ 37.267176][ T368] GACT probability NOT on [ 40.851560][ T401] [ 40.851716][ T401] ===================================================== [ 40.851990][ T401] WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected [ 40.852320][ T401] 6.9.0-rc1-virtme #1 Not tainted [ 40.852542][ T401] ----------------------------------------------------- [ 40.852814][ T401] sysctl/401 [HC0[0]:SC0[2]:HE1:SE0] is trying to acquire: [ 40.853145][ T401] ffff888006a0ac28 (&p->alloc_lock){+.+.}-{2:2}, at: __get_task_comm+0x27/0x70 [ 40.853542][ T401] [ 40.853542][ T401] and this task is already holding: [ 40.853862][ T401] ffff888004e23d80 (&ndev->lock){++--}-{2:2}, at: __ipv6_dev_ac_inc+0x42/0xb10 [ 40.854263][ T401] which would create a new lock dependency: [ 40.854537][ T401] (&ndev->lock){++--}-{2:2} -> (&p->alloc_lock){+.+.}-{2:2} [ 40.854876][ T401] [ 40.854876][ T401] but this new dependency connects a SOFTIRQ-irq-safe lock: [ 40.855240][ T401] (&ndev->lock){++--}-{2:2} [ 40.855247][ T401] [ 40.855247][ T401] ... which became SOFTIRQ-irq-safe at: [ 40.855656][ T401] __lock_acquire+0x797/0x1570 [ 40.855813][ T401] lock_acquire.part.0+0xeb/0x330 [ 40.855951][ T401] _raw_write_lock+0x30/0x40 [ 40.856104][ T401] addrconf_rs_timer+0xa9/0x730 [ 40.856249][ T401] call_timer_fn+0x13b/0x230 [ 40.856398][ T401] __run_timers+0x545/0x810 [ 40.856541][ T401] run_timer_softirq+0xe8/0x1b0 [ 40.856682][ T401] __do_softirq+0x1f8/0x5df [ 40.856828][ T401] irq_exit_rcu+0x97/0xc0 [ 40.856967][ T401] sysvec_apic_timer_interrupt+0x75/0x80 [ 40.857112][ T401] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 40.857282][ T401] default_idle+0xf/0x20 [ 40.857398][ T401] default_idle_call+0x6d/0xb0 [ 40.857537][ T401] cpuidle_idle_call+0x1f4/0x280 [ 40.857683][ T401] do_idle+0xf9/0x160 [ 40.857792][ T401] cpu_startup_entry+0x54/0x60 [ 40.857927][ T401] start_secondary+0x21c/0x2b0 [ 40.858072][ T401] common_startup_64+0x12c/0x138 [ 40.858210][ T401] [ 40.858210][ T401] to a SOFTIRQ-irq-unsafe lock: [ 40.858386][ T401] (&p->alloc_lock){+.+.}-{2:2} [ 40.858390][ T401] [ 40.858390][ T401] ... which became SOFTIRQ-irq-unsafe at: [ 40.858725][ T401] ... [ 40.858727][ T401] __lock_acquire+0x797/0x1570 [ 40.858941][ T401] lock_acquire.part.0+0xeb/0x330 [ 40.859077][ T401] _raw_spin_lock+0x30/0x40 [ 40.859214][ T401] set_mems_allowed+0x1d/0x210 [ 40.859360][ T401] kernel_init_freeable+0x72/0x310 [ 40.859500][ T401] kernel_init+0x20/0x200 [ 40.859635][ T401] ret_from_fork+0x31/0x70 [ 40.859773][ T401] ret_from_fork_asm+0x1a/0x30 [ 40.859910][ T401] [ 40.859910][ T401] other info that might help us debug this: [ 40.859910][ T401] [ 40.860179][ T401] Possible interrupt unsafe locking scenario: [ 40.860179][ T401] [ 40.860387][ T401] CPU0 CPU1 [ 40.860524][ T401] ---- ---- [ 40.860659][ T401] lock(&p->alloc_lock); [ 40.860765][ T401] local_irq_disable(); [ 40.860933][ T401] lock(&ndev->lock); [ 40.861110][ T401] lock(&p->alloc_lock); [ 40.861286][ T401] [ 40.861396][ T401] lock(&ndev->lock); [ 40.861502][ T401] [ 40.861502][ T401] *** DEADLOCK *** [ 40.861502][ T401] [ 40.861703][ T401] 3 locks held by sysctl/401: [ 40.861842][ T401] #0: ffff88800611c3f0 (sb_writers#7){.+.+}-{0:0}, at: ksys_write+0xf5/0x1e0 [ 40.862096][ T401] #1: ffffffff8b3969c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_fixup_forwarding+0x20/0x460 [ 40.862392][ T401] #2: ffff888004e23d80 (&ndev->lock){++--}-{2:2}, at: __ipv6_dev_ac_inc+0x42/0xb10 [ 40.862638][ T401] [ 40.862638][ T401] the dependencies between SOFTIRQ-irq-safe lock and the holding lock: [ 40.862907][ T401] -> (&ndev->lock){++--}-{2:2} { [ 40.863051][ T401] HARDIRQ-ON-W at: [ 40.863159][ T401] __lock_acquire+0x797/0x1570 [ 40.863349][ T401] lock_acquire.part.0+0xeb/0x330 [ 40.863631][ T401] _raw_write_lock_bh+0x38/0x50 [ 40.863918][ T401] addrconf_permanent_addr+0x6e/0x670 [ 40.864114][ T401] addrconf_notify+0x749/0xd60 [ 40.864301][ T401] notifier_call_chain+0xcd/0x150 [ 40.864479][ T401] __dev_notify_flags+0xe6/0x250 [ 40.864664][ T401] dev_change_flags+0xec/0x160 [ 40.864840][ T401] do_setlink+0x7d6/0x21e0 [ 40.865020][ T401] __rtnl_newlink+0xaa7/0xd80 [ 40.865195][ T401] rtnl_newlink+0x63/0xa0 [ 40.865370][ T401] rtnetlink_rcv_msg+0x2fb/0xbf0 [ 40.865546][ T401] netlink_rcv_skb+0x130/0x360 [ 40.865725][ T401] netlink_unicast+0x449/0x710 [ 40.865899][ T401] netlink_sendmsg+0x723/0xbe0 [ 40.866073][ T401] ____sys_sendmsg+0x7b2/0xa10 [ 40.866249][ T401] ___sys_sendmsg+0xee/0x170 [ 40.866426][ T401] __sys_sendmsg+0xcd/0x170 [ 40.866599][ T401] do_syscall_64+0xc6/0x1e0 [ 40.866776][ T401] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 40.866990][ T401] HARDIRQ-ON-R at: [ 40.867095][ T401] __lock_acquire+0x797/0x1570 [ 40.867277][ T401] lock_acquire.part.0+0xeb/0x330 [ 40.867454][ T401] _raw_read_lock_bh+0x44/0x80 [ 40.867642][ T401] inet6_fill_ifla6_attrs+0x516/0x740 [ 40.867818][ T401] inet6_fill_link_af+0x5e/0xe0 [ 40.868003][ T401] rtnl_fill_ifinfo+0x1612/0x29e0 [ 40.868176][ T401] rtmsg_ifinfo_build_skb+0x13c/0x240 [ 40.868354][ T401] rtmsg_ifinfo_event.part.0+0x2d/0x120 [ 40.868564][ T401] rtmsg_ifinfo+0x5b/0xa0 [ 40.868742][ T401] register_netdevice+0x1177/0x1690 [ 40.868921][ T401] register_netdev+0x20/0x40 [ 40.869099][ T401] sit_init_net+0x250/0x4f0 [ 40.869277][ T401] ops_init+0x9b/0x560 [ 40.869418][ T401] register_pernet_operations+0x2db/0x710 [ 40.869644][ T401] register_pernet_device+0x2a/0x60 [ 40.869823][ T401] sit_init+0x23/0xe0 [ 40.869964][ T401] do_one_initcall+0x8d/0x1e0 [ 40.870142][ T401] do_initcalls+0x1b2/0x3e0 [ 40.870325][ T401] kernel_init_freeable+0x232/0x310 [ 40.870515][ T401] kernel_init+0x20/0x200 [ 40.870689][ T401] ret_from_fork+0x31/0x70 [ 40.870869][ T401] ret_from_fork_asm+0x1a/0x30 [ 40.871045][ T401] IN-SOFTIRQ-W at: [ 40.871150][ T401] __lock_acquire+0x797/0x1570 [ 40.871330][ T401] lock_acquire.part.0+0xeb/0x330 [ 40.871508][ T401] _raw_write_lock+0x30/0x40 [ 40.871690][ T401] addrconf_rs_timer+0xa9/0x730 [ 40.871866][ T401] call_timer_fn+0x13b/0x230 [ 40.872046][ T401] __run_timers+0x545/0x810 [ 40.872225][ T401] run_timer_softirq+0xe8/0x1b0 [ 40.872405][ T401] __do_softirq+0x1f8/0x5df [ 40.872583][ T401] irq_exit_rcu+0x97/0xc0 [ 40.872760][ T401] sysvec_apic_timer_interrupt+0x75/0x80 [ 40.872980][ T401] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 40.873193][ T401] default_idle+0xf/0x20 [ 40.873366][ T401] default_idle_call+0x6d/0xb0 [ 40.873541][ T401] cpuidle_idle_call+0x1f4/0x280 [ 40.873726][ T401] do_idle+0xf9/0x160 [ 40.873870][ T401] cpu_startup_entry+0x54/0x60 [ 40.874044][ T401] start_secondary+0x21c/0x2b0 [ 40.874235][ T401] common_startup_64+0x12c/0x138 [ 40.874412][ T401] IN-SOFTIRQ-R at: [ 40.874515][ T401] __lock_acquire+0x797/0x1570 [ 40.874696][ T401] lock_acquire.part.0+0xeb/0x330 [ 40.874873][ T401] _raw_read_lock_bh+0x44/0x80 [ 40.875054][ T401] ipv6_get_lladdr+0xa9/0x3e0 [ 40.875230][ T401] addrconf_rs_timer+0x24a/0x730 [ 40.875404][ T401] call_timer_fn+0x13b/0x230 [ 40.875585][ T401] __run_timers+0x545/0x810 [ 40.875759][ T401] run_timer_softirq+0xe8/0x1b0 [ 40.875940][ T401] __do_softirq+0x1f8/0x5df [ 40.876123][ T401] irq_exit_rcu+0x97/0xc0 [ 40.876300][ T401] sysvec_apic_timer_interrupt+0x75/0x80 [ 40.876508][ T401] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 40.876721][ T401] default_idle+0xf/0x20 [ 40.876895][ T401] default_idle_call+0x6d/0xb0 [ 40.877077][ T401] cpuidle_idle_call+0x1f4/0x280 [ 40.877256][ T401] do_idle+0xf9/0x160 [ 40.877405][ T401] cpu_startup_entry+0x54/0x60 [ 40.877580][ T401] start_secondary+0x21c/0x2b0 [ 40.877853][ T401] common_startup_64+0x12c/0x138 [ 40.878026][ T401] INITIAL USE at: [ 40.878130][ T401] __lock_acquire+0x797/0x1570 [ 40.878303][ T401] lock_acquire.part.0+0xeb/0x330 [ 40.878483][ T401] _raw_write_lock_bh+0x38/0x50 [ 40.878658][ T401] addrconf_permanent_addr+0x6e/0x670 [ 40.878830][ T401] addrconf_notify+0x749/0xd60 [ 40.879090][ T401] notifier_call_chain+0xcd/0x150 [ 40.879266][ T401] __dev_notify_flags+0xe6/0x250 [ 40.879437][ T401] dev_change_flags+0xec/0x160 [ 40.879614][ T401] do_setlink+0x7d6/0x21e0 [ 40.879873][ T401] __rtnl_newlink+0xaa7/0xd80 [ 40.880046][ T401] rtnl_newlink+0x63/0xa0 [ 40.880222][ T401] rtnetlink_rcv_msg+0x2fb/0xbf0 [ 40.880396][ T401] netlink_rcv_skb+0x130/0x360 [ 40.880571][ T401] netlink_unicast+0x449/0x710 [ 40.880744][ T401] netlink_sendmsg+0x723/0xbe0 [ 40.880921][ T401] ____sys_sendmsg+0x7b2/0xa10 [ 40.881176][ T401] ___sys_sendmsg+0xee/0x170 [ 40.881350][ T401] __sys_sendmsg+0xcd/0x170 [ 40.881525][ T401] do_syscall_64+0xc6/0x1e0 [ 40.881782][ T401] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 40.881987][ T401] INITIAL READ USE at: [ 40.882093][ T401] __lock_acquire+0x797/0x1570 [ 40.882274][ T401] lock_acquire.part.0+0xeb/0x330 [ 40.882532][ T401] _raw_read_lock_bh+0x44/0x80 [ 40.882708][ T401] inet6_fill_ifla6_attrs+0x516/0x740 [ 40.882916][ T401] inet6_fill_link_af+0x5e/0xe0 [ 40.883171][ T401] rtnl_fill_ifinfo+0x1612/0x29e0 [ 40.883351][ T401] rtmsg_ifinfo_build_skb+0x13c/0x240 [ 40.883559][ T401] rtmsg_ifinfo_event.part.0+0x2d/0x120 [ 40.883947][ T401] rtmsg_ifinfo+0x5b/0xa0 [ 40.884156][ T401] register_netdevice+0x1177/0x1690 [ 40.884369][ T401] register_netdev+0x20/0x40 [ 40.884545][ T401] sit_init_net+0x250/0x4f0 [ 40.884732][ T401] ops_init+0x9b/0x560 [ 40.884905][ T401] register_pernet_operations+0x2db/0x710 [ 40.885203][ T401] register_pernet_device+0x2a/0x60 [ 40.885415][ T401] sit_init+0x23/0xe0 [ 40.885587][ T401] do_one_initcall+0x8d/0x1e0 [ 40.885849][ T401] do_initcalls+0x1b2/0x3e0 [ 40.886037][ T401] kernel_init_freeable+0x232/0x310 [ 40.886244][ T401] kernel_init+0x20/0x200 [ 40.886431][ T401] ret_from_fork+0x31/0x70 [ 40.886610][ T401] ret_from_fork_asm+0x1a/0x30 [ 40.886782][ T401] } [ 40.886859][ T401] ... key at: [] __key.37+0x0/0x40 [ 40.887150][ T401] [ 40.887150][ T401] the dependencies between the lock to be acquired [ 40.887152][ T401] and SOFTIRQ-irq-unsafe lock: [ 40.887528][ T401] -> (&p->alloc_lock){+.+.}-{2:2} { [ 40.887676][ T401] HARDIRQ-ON-W at: [ 40.887872][ T401] __lock_acquire+0x797/0x1570 [ 40.888046][ T401] lock_acquire.part.0+0xeb/0x330 [ 40.888221][ T401] _raw_spin_lock+0x30/0x40 [ 40.888405][ T401] set_mems_allowed+0x1d/0x210 [ 40.888583][ T401] kernel_init_freeable+0x72/0x310 [ 40.888757][ T401] kernel_init+0x20/0x200 [ 40.888934][ T401] ret_from_fork+0x31/0x70 [ 40.889194][ T401] ret_from_fork_asm+0x1a/0x30 [ 40.889371][ T401] SOFTIRQ-ON-W at: [ 40.889474][ T401] __lock_acquire+0x797/0x1570 [ 40.889655][ T401] lock_acquire.part.0+0xeb/0x330 [ 40.889916][ T401] _raw_spin_lock+0x30/0x40 [ 40.890096][ T401] set_mems_allowed+0x1d/0x210 [ 40.890270][ T401] kernel_init_freeable+0x72/0x310 [ 40.890443][ T401] kernel_init+0x20/0x200 [ 40.890625][ T401] ret_from_fork+0x31/0x70 [ 40.890802][ T401] ret_from_fork_asm+0x1a/0x30 [ 40.890981][ T401] INITIAL USE at: [ 40.891167][ T401] __lock_acquire+0x797/0x1570 [ 40.891348][ T401] lock_acquire.part.0+0xeb/0x330 [ 40.891520][ T401] _raw_spin_lock+0x30/0x40 [ 40.891783][ T401] set_mems_allowed+0x1d/0x210 [ 40.891956][ T401] kernel_init_freeable+0x72/0x310 [ 40.892134][ T401] kernel_init+0x20/0x200 [ 40.892316][ T401] ret_from_fork+0x31/0x70 [ 40.892491][ T401] ret_from_fork_asm+0x1a/0x30 [ 40.892783][ T401] } [ 40.892857][ T401] ... key at: [] __key.387+0x0/0x40 [ 40.893065][ T401] ... acquired at: [ 40.893250][ T401] check_prev_add+0x194/0xce0 [ 40.893391][ T401] validate_chain+0x71d/0x9b0 [ 40.893535][ T401] __lock_acquire+0xaf0/0x1570 [ 40.893678][ T401] lock_acquire.part.0+0xeb/0x330 [ 40.893911][ T401] _raw_spin_lock+0x30/0x40 [ 40.894091][ T401] __get_task_comm+0x27/0x70 [ 40.894234][ T401] ref_tracker_alloc+0x2ee/0x490 [ 40.894373][ T401] netdev_get_by_index+0x5e/0x80 [ 40.894674][ T401] fib6_nh_init+0x3d8/0x15b0 [ 40.894828][ T401] ip6_route_info_create+0xf18/0x17d0 [ 40.894970][ T401] addrconf_f6i_alloc+0x265/0x560 [ 40.895110][ T401] __ipv6_dev_ac_inc+0x25f/0xb10 [ 40.895254][ T401] addrconf_join_anycast+0x1c0/0x220 [ 40.895478][ T401] dev_forward_change+0x2a6/0x7b0 [ 40.895615][ T401] addrconf_fixup_forwarding+0x23f/0x460 [ 40.895785][ T401] addrconf_sysctl_forward+0x212/0x2b0 [ 40.895924][ T401] proc_sys_call_handler+0x403/0x5e0 [ 40.896144][ T401] vfs_write+0x9e5/0x10a0 [ 40.896283][ T401] ksys_write+0xf5/0x1e0 [ 40.896433][ T401] do_syscall_64+0xc6/0x1e0 [ 40.896572][ T401] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 40.896826][ T401] [ 40.896899][ T401] [ 40.896899][ T401] stack backtrace: [ 40.897068][ T401] CPU: 3 PID: 401 Comm: sysctl Not tainted 6.9.0-rc1-virtme #1 [ 40.897275][ T401] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 40.897663][ T401] Call Trace: [ 40.897771][ T401] [ 40.897843][ T401] dump_stack_lvl+0x82/0xd0 [ 40.898064][ T401] print_bad_irq_dependency+0x957/0xd40 [ 40.898205][ T401] ? hlock_class+0x4e/0x130 [ 40.898345][ T401] ? __pfx_print_bad_irq_dependency+0x10/0x10 [ 40.898518][ T401] ? __pfx_usage_skip+0x10/0x10 [ 40.898734][ T401] ? __bfs+0x246/0x650 [ 40.898840][ T401] ? __pfx_usage_match+0x10/0x10 [ 40.898981][ T401] check_irq_usage+0x596/0x850 [ 40.899121][ T401] ? __pfx_check_irq_usage+0x10/0x10 [ 40.899259][ T401] ? __bfs+0x246/0x650 [ 40.899446][ T401] ? __pfx_hlock_conflict+0x10/0x10 [ 40.899595][ T401] ? check_path.constprop.0+0x24/0x50 [ 40.899742][ T401] ? check_noncircular+0x14c/0x3e0 [ 40.899892][ T401] ? __pfx_check_noncircular+0x10/0x10 [ 40.900134][ T401] ? check_prev_add+0x194/0xce0 [ 40.900286][ T401] check_prev_add+0x194/0xce0 [ 40.900437][ T401] ? validate_chain+0x130/0x9b0 [ 40.900590][ T401] validate_chain+0x71d/0x9b0 [ 40.900740][ T401] ? mark_lock+0x38/0x3e0 [ 40.900938][ T401] ? __pfx_validate_chain+0x10/0x10 [ 40.901077][ T401] ? hlock_class+0x4e/0x130 [ 40.901215][ T401] ? mark_lock+0x38/0x3e0 [ 40.901321][ T401] __lock_acquire+0xaf0/0x1570 [ 40.901467][ T401] lock_acquire.part.0+0xeb/0x330 [ 40.901604][ T401] ? __get_task_comm+0x27/0x70 [ 40.901742][ T401] ? mark_lock+0x38/0x3e0 [ 40.901848][ T401] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 40.901987][ T401] ? trace_lock_acquire+0x135/0x1c0 [ 40.902213][ T401] ? __get_task_comm+0x27/0x70 [ 40.902349][ T401] ? lock_acquire+0x32/0xc0 [ 40.902491][ T401] ? __get_task_comm+0x27/0x70 [ 40.902628][ T401] _raw_spin_lock+0x30/0x40 [ 40.902857][ T401] ? __get_task_comm+0x27/0x70 [ 40.902997][ T401] __get_task_comm+0x27/0x70 [ 40.903134][ T401] ref_tracker_alloc+0x2ee/0x490 [ 40.903274][ T401] ? __pfx_ref_tracker_alloc+0x10/0x10 [ 40.903415][ T401] ? dev_get_by_index+0x177/0x270 [ 40.903553][ T401] ? netdev_get_by_index+0x5e/0x80 [ 40.903690][ T401] ? fib6_nh_init+0x3d8/0x15b0 [ 40.903827][ T401] ? ip6_route_info_create+0xf18/0x17d0 [ 40.903969][ T401] ? addrconf_f6i_alloc+0x265/0x560 [ 40.904201][ T401] ? __ipv6_dev_ac_inc+0x25f/0xb10 [ 40.904341][ T401] ? addrconf_join_anycast+0x1c0/0x220 [ 40.904482][ T401] ? dev_forward_change+0x2a6/0x7b0 [ 40.904618][ T401] ? addrconf_fixup_forwarding+0x23f/0x460 [ 40.904874][ T401] ? addrconf_sysctl_forward+0x212/0x2b0 [ 40.905011][ T401] ? proc_sys_call_handler+0x403/0x5e0 [ 40.905150][ T401] ? vfs_write+0x9e5/0x10a0 [ 40.905287][ T401] ? ksys_write+0xf5/0x1e0 [ 40.905508][ T401] ? do_syscall_64+0xc6/0x1e0 [ 40.905645][ T401] ? entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 40.905818][ T401] ? dev_get_by_index+0x177/0x270 [ 40.905957][ T401] netdev_get_by_index+0x5e/0x80 [ 40.906173][ T401] fib6_nh_init+0x3d8/0x15b0 [ 40.906310][ T401] ? lockdep_hardirqs_on_prepare.part.0+0x14f/0x370 [ 40.906489][ T401] ? __pfx_fib6_nh_init+0x10/0x10 [ 40.906626][ T401] ? kasan_save_track+0x14/0x30 [ 40.906853][ T401] ? __kasan_kmalloc+0x7f/0x90 [ 40.906991][ T401] ? __kmalloc+0x1d7/0x3c0 [ 40.907130][ T401] ? fib6_get_table+0x116/0x290 [ 40.907269][ T401] ip6_route_info_create+0xf18/0x17d0 [ 40.907410][ T401] ? __lock_release+0x103/0x460 [ 40.907549][ T401] ? __pfx_ip6_route_info_create+0x10/0x10 [ 40.907720][ T401] ? addrconf_f6i_alloc+0x12d/0x560 [ 40.907862][ T401] addrconf_f6i_alloc+0x265/0x560 [ 40.908080][ T401] ? __pfx_addrconf_f6i_alloc+0x10/0x10 [ 40.908221][ T401] ? do_raw_write_lock+0x122/0x3b0 [ 40.908360][ T401] ? __pfx_do_raw_write_lock+0x10/0x10 [ 40.908502][ T401] ? lock_acquire+0x32/0xc0 [ 40.908723][ T401] __ipv6_dev_ac_inc+0x25f/0xb10 [ 40.908863][ T401] addrconf_join_anycast+0x1c0/0x220 [ 40.909000][ T401] ? mark_lock+0x38/0x3e0 [ 40.909108][ T401] ? __pfx_addrconf_join_anycast+0x10/0x10 [ 40.909282][ T401] ? lockdep_hardirqs_on_prepare.part.0+0x1af/0x370 [ 40.909540][ T401] dev_forward_change+0x2a6/0x7b0 [ 40.909680][ T401] ? __pfx_dev_forward_change+0x10/0x10 [ 40.909819][ T401] addrconf_fixup_forwarding+0x23f/0x460 [ 40.909957][ T401] addrconf_sysctl_forward+0x212/0x2b0 [ 40.910177][ T401] ? __pfx_addrconf_sysctl_forward+0x10/0x10 [ 40.910353][ T401] ? __pfx_addrconf_sysctl_forward+0x10/0x10 [ 40.910525][ T401] ? trace_kmalloc+0x2a/0xe0 [ 40.910741][ T401] ? __kmalloc_node+0x220/0x400 [ 40.910882][ T401] ? proc_sys_call_handler+0x30b/0x5e0 [ 40.911022][ T401] proc_sys_call_handler+0x403/0x5e0 [ 40.911161][ T401] ? __pfx_proc_sys_call_handler+0x10/0x10 [ 40.911331][ T401] ? __lock_acquire+0xaf0/0x1570 [ 40.911470][ T401] vfs_write+0x9e5/0x10a0 [ 40.911577][ T401] ? do_user_addr_fault+0x449/0xbe0 [ 40.911716][ T401] ? __pfx_vfs_write+0x10/0x10 [ 40.911855][ T401] ? find_held_lock+0x2c/0x110 [ 40.912076][ T401] ? __pfx___lock_release+0x10/0x10 [ 40.912215][ T401] ? __fget_light+0x53/0x1e0 [ 40.912354][ T401] ksys_write+0xf5/0x1e0 [ 40.912459][ T401] ? __pfx_ksys_write+0x10/0x10 [ 40.912678][ T401] ? do_user_addr_fault+0x4bd/0xbe0 [ 40.912819][ T401] do_syscall_64+0xc6/0x1e0 [ 40.912958][ T401] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 40.913129][ T401] RIP: 0033:0x7f5a560f3957 [ 40.913364][ T401] Code: 0b 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24 [ 40.913856][ T401] RSP: 002b:00007fff83aa2c98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 40.914160][ T401] RAX: ffffffffffffffda RBX: 000055e5e8e4e360 RCX: 00007f5a560f3957 [ 40.914364][ T401] RDX: 0000000000000002 RSI: 000055e5e8e4e3a0 RDI: 0000000000000005 [ 40.914569][ T401] RBP: 000055e5e8e504d0 R08: 0000000000000003 R09: 0000000000000077 [ 40.914866][ T401] R10: 000000000000006b R11: 0000000000000246 R12: 0000000000000002 [ 40.915070][ T401] R13: 0000000000000002 R14: 0000000000000002 R15: 00007f5a561aa9c0 [ 40.915288][ T401]