[ 31.363194][ T310] gre: GRE over IPv4 demultiplexor driver [ 31.384545][ T310] ip_gre: GRE over IPv4 tunneling driver [ 33.365679][ T332] 8021q: 802.1Q VLAN Support v1.8 [ 37.409855][ T370] GACT probability NOT on [ 40.952746][ T403] [ 40.952850][ T403] ===================================================== [ 40.953023][ T403] WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected [ 40.953227][ T403] 6.9.0-rc1-virtme #1 Not tainted [ 40.953368][ T403] ----------------------------------------------------- [ 40.953536][ T403] sysctl/403 [HC0[0]:SC0[2]:HE1:SE0] is trying to acquire: [ 40.953741][ T403] ffff888004944ee8 (&p->alloc_lock){+.+.}-{2:2}, at: __get_task_comm+0x27/0x70 [ 40.954029][ T403] [ 40.954029][ T403] and this task is already holding: [ 40.954230][ T403] ffff8880069a6d80 (&ndev->lock){++--}-{2:2}, at: __ipv6_dev_ac_inc+0x42/0xb10 [ 40.954474][ T403] which would create a new lock dependency: [ 40.954643][ T403] (&ndev->lock){++--}-{2:2} -> (&p->alloc_lock){+.+.}-{2:2} [ 40.954850][ T403] [ 40.954850][ T403] but this new dependency connects a SOFTIRQ-irq-safe lock: [ 40.955085][ T403] (&ndev->lock){++--}-{2:2} [ 40.955088][ T403] [ 40.955088][ T403] ... which became SOFTIRQ-irq-safe at: [ 40.955427][ T403] __lock_acquire+0x797/0x1570 [ 40.955570][ T403] lock_acquire.part.0+0xeb/0x330 [ 40.955709][ T403] _raw_write_lock+0x30/0x40 [ 40.955852][ T403] addrconf_rs_timer+0xa9/0x730 [ 40.955989][ T403] call_timer_fn+0x13b/0x230 [ 40.956130][ T403] __run_timers+0x545/0x810 [ 40.956272][ T403] run_timer_softirq+0xe8/0x1b0 [ 40.956411][ T403] __do_softirq+0x1f8/0x5df [ 40.956549][ T403] irq_exit_rcu+0x97/0xc0 [ 40.956686][ T403] sysvec_apic_timer_interrupt+0x75/0x80 [ 40.956826][ T403] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 40.957003][ T403] default_idle+0xf/0x20 [ 40.957107][ T403] default_idle_call+0x6d/0xb0 [ 40.957245][ T403] cpuidle_idle_call+0x1f4/0x280 [ 40.957383][ T403] do_idle+0xf9/0x160 [ 40.957491][ T403] cpu_startup_entry+0x54/0x60 [ 40.957632][ T403] start_secondary+0x21c/0x2b0 [ 40.957794][ T403] common_startup_64+0x12c/0x138 [ 40.957931][ T403] [ 40.957931][ T403] to a SOFTIRQ-irq-unsafe lock: [ 40.958106][ T403] (&p->alloc_lock){+.+.}-{2:2} [ 40.958110][ T403] [ 40.958110][ T403] ... which became SOFTIRQ-irq-unsafe at: [ 40.958594][ T403] ... [ 40.958595][ T403] __lock_acquire+0x797/0x1570 [ 40.958808][ T403] lock_acquire.part.0+0xeb/0x330 [ 40.958949][ T403] _raw_spin_lock+0x30/0x40 [ 40.959091][ T403] set_mems_allowed+0x1d/0x210 [ 40.959244][ T403] kernel_init_freeable+0x72/0x310 [ 40.959383][ T403] kernel_init+0x20/0x200 [ 40.959523][ T403] ret_from_fork+0x31/0x70 [ 40.959671][ T403] ret_from_fork_asm+0x1a/0x30 [ 40.959808][ T403] [ 40.959808][ T403] other info that might help us debug this: [ 40.959808][ T403] [ 40.960088][ T403] Possible interrupt unsafe locking scenario: [ 40.960088][ T403] [ 40.960298][ T403] CPU0 CPU1 [ 40.960440][ T403] ---- ---- [ 40.960578][ T403] lock(&p->alloc_lock); [ 40.960687][ T403] local_irq_disable(); [ 40.960857][ T403] lock(&ndev->lock); [ 40.961033][ T403] lock(&p->alloc_lock); [ 40.961207][ T403] [ 40.961341][ T403] lock(&ndev->lock); [ 40.961452][ T403] [ 40.961452][ T403] *** DEADLOCK *** [ 40.961452][ T403] [ 40.961655][ T403] 3 locks held by sysctl/403: [ 40.961799][ T403] #0: ffff888005fac3f0 (sb_writers#7){.+.+}-{0:0}, at: ksys_write+0xf5/0x1e0 [ 40.962057][ T403] #1: ffffffffa1f969c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_fixup_forwarding+0x20/0x460 [ 40.962350][ T403] #2: ffff8880069a6d80 (&ndev->lock){++--}-{2:2}, at: __ipv6_dev_ac_inc+0x42/0xb10 [ 40.962604][ T403] [ 40.962604][ T403] the dependencies between SOFTIRQ-irq-safe lock and the holding lock: [ 40.962873][ T403] -> (&ndev->lock){++--}-{2:2} { [ 40.963018][ T403] HARDIRQ-ON-W at: [ 40.963135][ T403] __lock_acquire+0x797/0x1570 [ 40.963323][ T403] lock_acquire.part.0+0xeb/0x330 [ 40.963500][ T403] _raw_write_lock_bh+0x38/0x50 [ 40.963678][ T403] addrconf_permanent_addr+0x6e/0x670 [ 40.963856][ T403] addrconf_notify+0x749/0xd60 [ 40.964032][ T403] notifier_call_chain+0xcd/0x150 [ 40.964208][ T403] __dev_notify_flags+0xe6/0x250 [ 40.964397][ T403] dev_change_flags+0xec/0x160 [ 40.964571][ T403] do_setlink+0x7d6/0x21e0 [ 40.964750][ T403] __rtnl_newlink+0xaa7/0xd80 [ 40.964924][ T403] rtnl_newlink+0x63/0xa0 [ 40.965100][ T403] rtnetlink_rcv_msg+0x2fb/0xbf0 [ 40.965273][ T403] netlink_rcv_skb+0x130/0x360 [ 40.965457][ T403] netlink_unicast+0x449/0x710 [ 40.965631][ T403] netlink_sendmsg+0x723/0xbe0 [ 40.965806][ T403] ____sys_sendmsg+0x7b2/0xa10 [ 40.965991][ T403] ___sys_sendmsg+0xee/0x170 [ 40.966170][ T403] __sys_sendmsg+0xcd/0x170 [ 40.966347][ T403] do_syscall_64+0xc6/0x1e0 [ 40.966521][ T403] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 40.966736][ T403] HARDIRQ-ON-R at: [ 40.966843][ T403] __lock_acquire+0x797/0x1570 [ 40.967019][ T403] lock_acquire.part.0+0xeb/0x330 [ 40.967194][ T403] _raw_read_lock_bh+0x44/0x80 [ 40.967377][ T403] inet6_fill_ifla6_attrs+0x516/0x740 [ 40.967549][ T403] inet6_fill_link_af+0x5e/0xe0 [ 40.967723][ T403] rtnl_fill_ifinfo+0x1612/0x29e0 [ 40.967899][ T403] rtmsg_ifinfo_build_skb+0x13c/0x240 [ 40.968074][ T403] rtmsg_ifinfo_event.part.0+0x2d/0x120 [ 40.968282][ T403] rtmsg_ifinfo+0x5b/0xa0 [ 40.968470][ T403] register_netdevice+0x1177/0x1690 [ 40.968648][ T403] register_netdev+0x20/0x40 [ 40.968820][ T403] sit_init_net+0x250/0x4f0 [ 40.969005][ T403] ops_init+0x9b/0x560 [ 40.969147][ T403] register_pernet_operations+0x2db/0x710 [ 40.969363][ T403] register_pernet_device+0x2a/0x60 [ 40.969539][ T403] sit_init+0x23/0xe0 [ 40.969682][ T403] do_one_initcall+0x8d/0x1e0 [ 40.969860][ T403] do_initcalls+0x1b2/0x3e0 [ 40.970039][ T403] kernel_init_freeable+0x232/0x310 [ 40.970216][ T403] kernel_init+0x20/0x200 [ 40.970397][ T403] ret_from_fork+0x31/0x70 [ 40.970574][ T403] ret_from_fork_asm+0x1a/0x30 [ 40.970749][ T403] IN-SOFTIRQ-W at: [ 40.970855][ T403] __lock_acquire+0x797/0x1570 [ 40.971034][ T403] lock_acquire.part.0+0xeb/0x330 [ 40.971214][ T403] _raw_write_lock+0x30/0x40 [ 40.971389][ T403] addrconf_rs_timer+0xa9/0x730 [ 40.971562][ T403] call_timer_fn+0x13b/0x230 [ 40.971742][ T403] __run_timers+0x545/0x810 [ 40.971914][ T403] run_timer_softirq+0xe8/0x1b0 [ 40.972087][ T403] __do_softirq+0x1f8/0x5df [ 40.972353][ T403] irq_exit_rcu+0x97/0xc0 [ 40.972528][ T403] sysvec_apic_timer_interrupt+0x75/0x80 [ 40.972736][ T403] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 40.973026][ T403] default_idle+0xf/0x20 [ 40.973201][ T403] default_idle_call+0x6d/0xb0 [ 40.973375][ T403] cpuidle_idle_call+0x1f4/0x280 [ 40.973550][ T403] do_idle+0xf9/0x160 [ 40.973780][ T403] cpu_startup_entry+0x54/0x60 [ 40.973955][ T403] start_secondary+0x21c/0x2b0 [ 40.974133][ T403] common_startup_64+0x12c/0x138 [ 40.974421][ T403] IN-SOFTIRQ-R at: [ 40.974527][ T403] __lock_acquire+0x797/0x1570 [ 40.974716][ T403] lock_acquire.part.0+0xeb/0x330 [ 40.974895][ T403] _raw_read_lock_bh+0x44/0x80 [ 40.975152][ T403] ipv6_get_lladdr+0xa9/0x3e0 [ 40.975331][ T403] addrconf_rs_timer+0x24a/0x730 [ 40.975514][ T403] call_timer_fn+0x13b/0x230 [ 40.975769][ T403] __run_timers+0x545/0x810 [ 40.975944][ T403] run_timer_softirq+0xe8/0x1b0 [ 40.976118][ T403] __do_softirq+0x1f8/0x5df [ 40.976302][ T403] irq_exit_rcu+0x97/0xc0 [ 40.976644][ T403] sysvec_apic_timer_interrupt+0x75/0x80 [ 40.976878][ T403] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 40.977091][ T403] default_idle+0xf/0x20 [ 40.977268][ T403] default_idle_call+0x6d/0xb0 [ 40.977442][ T403] cpuidle_idle_call+0x1f4/0x280 [ 40.977619][ T403] do_idle+0xf9/0x160 [ 40.977843][ T403] cpu_startup_entry+0x54/0x60 [ 40.978024][ T403] start_secondary+0x21c/0x2b0 [ 40.978216][ T403] common_startup_64+0x12c/0x138 [ 40.978406][ T403] INITIAL USE at: [ 40.978596][ T403] __lock_acquire+0x797/0x1570 [ 40.978773][ T403] lock_acquire.part.0+0xeb/0x330 [ 40.978953][ T403] _raw_write_lock_bh+0x38/0x50 [ 40.979131][ T403] addrconf_permanent_addr+0x6e/0x670 [ 40.979310][ T403] addrconf_notify+0x749/0xd60 [ 40.979486][ T403] notifier_call_chain+0xcd/0x150 [ 40.979662][ T403] __dev_notify_flags+0xe6/0x250 [ 40.979922][ T403] dev_change_flags+0xec/0x160 [ 40.980103][ T403] do_setlink+0x7d6/0x21e0 [ 40.980277][ T403] __rtnl_newlink+0xaa7/0xd80 [ 40.980537][ T403] rtnl_newlink+0x63/0xa0 [ 40.980713][ T403] rtnetlink_rcv_msg+0x2fb/0xbf0 [ 40.980886][ T403] netlink_rcv_skb+0x130/0x360 [ 40.981061][ T403] netlink_unicast+0x449/0x710 [ 40.981236][ T403] netlink_sendmsg+0x723/0xbe0 [ 40.981418][ T403] ____sys_sendmsg+0x7b2/0xa10 [ 40.981596][ T403] ___sys_sendmsg+0xee/0x170 [ 40.981853][ T403] __sys_sendmsg+0xcd/0x170 [ 40.982027][ T403] do_syscall_64+0xc6/0x1e0 [ 40.982201][ T403] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 40.982488][ T403] INITIAL READ USE at: [ 40.982593][ T403] __lock_acquire+0x797/0x1570 [ 40.982774][ T403] lock_acquire.part.0+0xeb/0x330 [ 40.982950][ T403] _raw_read_lock_bh+0x44/0x80 [ 40.983208][ T403] inet6_fill_ifla6_attrs+0x516/0x740 [ 40.983419][ T403] inet6_fill_link_af+0x5e/0xe0 [ 40.983592][ T403] rtnl_fill_ifinfo+0x1612/0x29e0 [ 40.983853][ T403] rtmsg_ifinfo_build_skb+0x13c/0x240 [ 40.984065][ T403] rtmsg_ifinfo_event.part.0+0x2d/0x120 [ 40.984274][ T403] rtmsg_ifinfo+0x5b/0xa0 [ 40.984531][ T403] register_netdevice+0x1177/0x1690 [ 40.984745][ T403] register_netdev+0x20/0x40 [ 40.984919][ T403] sit_init_net+0x250/0x4f0 [ 40.985102][ T403] ops_init+0x9b/0x560 [ 40.985363][ T403] register_pernet_operations+0x2db/0x710 [ 40.985574][ T403] register_pernet_device+0x2a/0x60 [ 40.985781][ T403] sit_init+0x23/0xe0 [ 40.986041][ T403] do_one_initcall+0x8d/0x1e0 [ 40.986215][ T403] do_initcalls+0x1b2/0x3e0 [ 40.986393][ T403] kernel_init_freeable+0x232/0x310 [ 40.986691][ T403] kernel_init+0x20/0x200 [ 40.986865][ T403] ret_from_fork+0x31/0x70 [ 40.987045][ T403] ret_from_fork_asm+0x1a/0x30 [ 40.987302][ T403] } [ 40.987374][ T403] ... key at: [] __key.37+0x0/0x40 [ 40.987580][ T403] [ 40.987580][ T403] the dependencies between the lock to be acquired [ 40.987581][ T403] and SOFTIRQ-irq-unsafe lock: [ 40.988046][ T403] -> (&p->alloc_lock){+.+.}-{2:2} { [ 40.988191][ T403] HARDIRQ-ON-W at: [ 40.988297][ T403] __lock_acquire+0x797/0x1570 [ 40.988485][ T403] lock_acquire.part.0+0xeb/0x330 [ 40.988761][ T403] _raw_spin_lock+0x30/0x40 [ 40.988934][ T403] set_mems_allowed+0x1d/0x210 [ 40.989113][ T403] kernel_init_freeable+0x72/0x310 [ 40.989291][ T403] kernel_init+0x20/0x200 [ 40.989463][ T403] ret_from_fork+0x31/0x70 [ 40.989638][ T403] ret_from_fork_asm+0x1a/0x30 [ 40.989812][ T403] SOFTIRQ-ON-W at: [ 40.989918][ T403] __lock_acquire+0x797/0x1570 [ 40.990092][ T403] lock_acquire.part.0+0xeb/0x330 [ 40.990273][ T403] _raw_spin_lock+0x30/0x40 [ 40.990531][ T403] set_mems_allowed+0x1d/0x210 [ 40.990703][ T403] kernel_init_freeable+0x72/0x310 [ 40.990876][ T403] kernel_init+0x20/0x200 [ 40.991049][ T403] ret_from_fork+0x31/0x70 [ 40.991313][ T403] ret_from_fork_asm+0x1a/0x30 [ 40.991490][ T403] INITIAL USE at: [ 40.991596][ T403] __lock_acquire+0x797/0x1570 [ 40.991772][ T403] lock_acquire.part.0+0xeb/0x330 [ 40.992030][ T403] _raw_spin_lock+0x30/0x40 [ 40.992204][ T403] set_mems_allowed+0x1d/0x210 [ 40.992381][ T403] kernel_init_freeable+0x72/0x310 [ 40.992638][ T403] kernel_init+0x20/0x200 [ 40.992816][ T403] ret_from_fork+0x31/0x70 [ 40.992996][ T403] ret_from_fork_asm+0x1a/0x30 [ 40.993178][ T403] } [ 40.993250][ T403] ... key at: [] __key.387+0x0/0x40 [ 40.993459][ T403] ... acquired at: [ 40.993565][ T403] check_prev_add+0x194/0xce0 [ 40.993707][ T403] validate_chain+0x71d/0x9b0 [ 40.993929][ T403] __lock_acquire+0xaf0/0x1570 [ 40.994073][ T403] lock_acquire.part.0+0xeb/0x330 [ 40.994216][ T403] _raw_spin_lock+0x30/0x40 [ 40.994356][ T403] __get_task_comm+0x27/0x70 [ 40.994576][ T403] ref_tracker_alloc+0x2ee/0x490 [ 40.994716][ T403] netdev_get_by_index+0x5e/0x80 [ 40.994855][ T403] fib6_nh_init+0x3d8/0x15b0 [ 40.994997][ T403] ip6_route_info_create+0xf18/0x17d0 [ 40.995171][ T403] addrconf_f6i_alloc+0x265/0x560 [ 40.995328][ T403] __ipv6_dev_ac_inc+0x25f/0xb10 [ 40.995482][ T403] addrconf_join_anycast+0x1c0/0x220 [ 40.995631][ T403] dev_forward_change+0x2a6/0x7b0 [ 40.995783][ T403] addrconf_fixup_forwarding+0x23f/0x460 [ 40.996057][ T403] addrconf_sysctl_forward+0x212/0x2b0 [ 40.996206][ T403] proc_sys_call_handler+0x403/0x5e0 [ 40.996360][ T403] vfs_write+0x9e5/0x10a0 [ 40.996515][ T403] ksys_write+0xf5/0x1e0 [ 40.996772][ T403] do_syscall_64+0xc6/0x1e0 [ 40.996926][ T403] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 40.997112][ T403] [ 40.997189][ T403] [ 40.997189][ T403] stack backtrace: [ 40.997379][ T403] CPU: 1 PID: 403 Comm: sysctl Not tainted 6.9.0-rc1-virtme #1 [ 40.997607][ T403] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 40.998026][ T403] Call Trace: [ 40.998140][ T403] [ 40.998226][ T403] dump_stack_lvl+0x82/0xd0 [ 40.998395][ T403] print_bad_irq_dependency+0x957/0xd40 [ 40.998545][ T403] ? hlock_class+0x4e/0x130 [ 40.998781][ T403] ? __pfx_print_bad_irq_dependency+0x10/0x10 [ 40.998969][ T403] ? __pfx_usage_skip+0x10/0x10 [ 40.999119][ T403] ? __bfs+0x246/0x650 [ 40.999234][ T403] ? __pfx_usage_match+0x10/0x10 [ 40.999390][ T403] check_irq_usage+0x596/0x850 [ 40.999624][ T403] ? __pfx_check_irq_usage+0x10/0x10 [ 40.999773][ T403] ? __bfs+0x246/0x650 [ 40.999886][ T403] ? __pfx_hlock_conflict+0x10/0x10 [ 41.000036][ T403] ? check_path.constprop.0+0x24/0x50 [ 41.000266][ T403] ? check_noncircular+0x14c/0x3e0 [ 41.000417][ T403] ? __pfx_check_noncircular+0x10/0x10 [ 41.000573][ T403] ? check_prev_add+0x194/0xce0 [ 41.000722][ T403] check_prev_add+0x194/0xce0 [ 41.000951][ T403] ? validate_chain+0x130/0x9b0 [ 41.001099][ T403] validate_chain+0x71d/0x9b0 [ 41.001249][ T403] ? mark_lock+0x38/0x3e0 [ 41.001363][ T403] ? __pfx_validate_chain+0x10/0x10 [ 41.001511][ T403] ? hlock_class+0x4e/0x130 [ 41.001741][ T403] ? mark_lock+0x38/0x3e0 [ 41.001855][ T403] __lock_acquire+0xaf0/0x1570 [ 41.002012][ T403] lock_acquire.part.0+0xeb/0x330 [ 41.002161][ T403] ? __get_task_comm+0x27/0x70 [ 41.002390][ T403] ? mark_lock+0x38/0x3e0 [ 41.002503][ T403] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 41.002651][ T403] ? trace_lock_acquire+0x135/0x1c0 [ 41.002799][ T403] ? __get_task_comm+0x27/0x70 [ 41.002946][ T403] ? lock_acquire+0x32/0xc0 [ 41.003174][ T403] ? __get_task_comm+0x27/0x70 [ 41.003352][ T403] _raw_spin_lock+0x30/0x40 [ 41.003502][ T403] ? __get_task_comm+0x27/0x70 [ 41.003650][ T403] __get_task_comm+0x27/0x70 [ 41.003892][ T403] ref_tracker_alloc+0x2ee/0x490 [ 41.004034][ T403] ? __pfx_ref_tracker_alloc+0x10/0x10 [ 41.004173][ T403] ? dev_get_by_index+0x177/0x270 [ 41.004310][ T403] ? netdev_get_by_index+0x5e/0x80 [ 41.004527][ T403] ? fib6_nh_init+0x3d8/0x15b0 [ 41.004664][ T403] ? ip6_route_info_create+0xf18/0x17d0 [ 41.004802][ T403] ? addrconf_f6i_alloc+0x265/0x560 [ 41.004947][ T403] ? __ipv6_dev_ac_inc+0x25f/0xb10 [ 41.005088][ T403] ? addrconf_join_anycast+0x1c0/0x220 [ 41.005307][ T403] ? dev_forward_change+0x2a6/0x7b0 [ 41.005445][ T403] ? addrconf_fixup_forwarding+0x23f/0x460 [ 41.005623][ T403] ? addrconf_sysctl_forward+0x212/0x2b0 [ 41.005767][ T403] ? proc_sys_call_handler+0x403/0x5e0 [ 41.005993][ T403] ? vfs_write+0x9e5/0x10a0 [ 41.006131][ T403] ? ksys_write+0xf5/0x1e0 [ 41.006271][ T403] ? do_syscall_64+0xc6/0x1e0 [ 41.006415][ T403] ? entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 41.006674][ T403] ? dev_get_by_index+0x177/0x270 [ 41.006815][ T403] netdev_get_by_index+0x5e/0x80 [ 41.006955][ T403] fib6_nh_init+0x3d8/0x15b0 [ 41.007095][ T403] ? lockdep_hardirqs_on_prepare.part.0+0x14f/0x370 [ 41.007271][ T403] ? __pfx_fib6_nh_init+0x10/0x10 [ 41.007414][ T403] ? kasan_save_track+0x14/0x30 [ 41.007554][ T403] ? __kasan_kmalloc+0x7f/0x90 [ 41.007693][ T403] ? __kmalloc+0x1d7/0x3c0 [ 41.007912][ T403] ? fib6_get_table+0x116/0x290 [ 41.008049][ T403] ip6_route_info_create+0xf18/0x17d0 [ 41.008202][ T403] ? __lock_release+0x103/0x460 [ 41.008373][ T403] ? __pfx_ip6_route_info_create+0x10/0x10 [ 41.008635][ T403] ? addrconf_f6i_alloc+0x12d/0x560 [ 41.008779][ T403] addrconf_f6i_alloc+0x265/0x560 [ 41.008916][ T403] ? __pfx_addrconf_f6i_alloc+0x10/0x10 [ 41.009060][ T403] ? do_raw_write_lock+0x122/0x3b0 [ 41.009283][ T403] ? __pfx_do_raw_write_lock+0x10/0x10 [ 41.009427][ T403] ? lock_acquire+0x32/0xc0 [ 41.009568][ T403] __ipv6_dev_ac_inc+0x25f/0xb10 [ 41.009710][ T403] addrconf_join_anycast+0x1c0/0x220 [ 41.009931][ T403] ? mark_lock+0x38/0x3e0 [ 41.010038][ T403] ? __pfx_addrconf_join_anycast+0x10/0x10 [ 41.010210][ T403] ? lockdep_hardirqs_on_prepare.part.0+0x1af/0x370 [ 41.010384][ T403] dev_forward_change+0x2a6/0x7b0 [ 41.010614][ T403] ? __pfx_dev_forward_change+0x10/0x10 [ 41.010756][ T403] addrconf_fixup_forwarding+0x23f/0x460 [ 41.010898][ T403] addrconf_sysctl_forward+0x212/0x2b0 [ 41.011037][ T403] ? __pfx_addrconf_sysctl_forward+0x10/0x10 [ 41.011216][ T403] ? __pfx_addrconf_sysctl_forward+0x10/0x10 [ 41.011390][ T403] ? trace_kmalloc+0x2a/0xe0 [ 41.011528][ T403] ? __kmalloc_node+0x220/0x400 [ 41.011666][ T403] ? proc_sys_call_handler+0x30b/0x5e0 [ 41.011885][ T403] proc_sys_call_handler+0x403/0x5e0 [ 41.012024][ T403] ? __pfx_proc_sys_call_handler+0x10/0x10 [ 41.012198][ T403] ? __lock_acquire+0xaf0/0x1570 [ 41.012339][ T403] vfs_write+0x9e5/0x10a0 [ 41.012451][ T403] ? do_user_addr_fault+0x449/0xbe0 [ 41.012680][ T403] ? __pfx_vfs_write+0x10/0x10 [ 41.012819][ T403] ? find_held_lock+0x2c/0x110 [ 41.012958][ T403] ? __pfx___lock_release+0x10/0x10 [ 41.013097][ T403] ? __fget_light+0x53/0x1e0 [ 41.013238][ T403] ksys_write+0xf5/0x1e0 [ 41.013343][ T403] ? __pfx_ksys_write+0x10/0x10 [ 41.013482][ T403] ? do_user_addr_fault+0x4bd/0xbe0 [ 41.013623][ T403] do_syscall_64+0xc6/0x1e0 [ 41.013847][ T403] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 41.014020][ T403] RIP: 0033:0x7fd6670df957 [ 41.014169][ T403] 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 [ 41.014745][ T403] RSP: 002b:00007ffc3c2d2fd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 41.014955][ T403] RAX: ffffffffffffffda RBX: 000055b466041360 RCX: 00007fd6670df957 [ 41.015249][ T403] RDX: 0000000000000002 RSI: 000055b4660413a0 RDI: 0000000000000005 [ 41.015456][ T403] RBP: 000055b4660434d0 R08: 0000000000000003 R09: 0000000000000077 [ 41.015663][ T403] R10: 000000000000006b R11: 0000000000000246 R12: 0000000000000002 [ 41.015953][ T403] R13: 0000000000000002 R14: 0000000000000002 R15: 00007fd6671969c0 [ 41.016174][ T403]