[ 37.017638][ T345] [ 37.017761][ T345] ===================================================== [ 37.017943][ T345] WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected [ 37.018167][ T345] 6.9.0-rc1-virtme #1 Not tainted [ 37.018318][ T345] ----------------------------------------------------- [ 37.018497][ T345] sysctl/345 [HC0[0]:SC0[2]:HE1:SE0] is trying to acquire: [ 37.018716][ T345] ffff888008800968 (&p->alloc_lock){+.+.}-{2:2}, at: __get_task_comm+0x27/0x70 [ 37.018971][ T345] [ 37.018971][ T345] and this task is already holding: [ 37.019216][ T345] ffff888005565580 (&ndev->lock){++--}-{2:2}, at: __ipv6_dev_ac_inc+0x42/0xb10 [ 37.019476][ T345] which would create a new lock dependency: [ 37.019660][ T345] (&ndev->lock){++--}-{2:2} -> (&p->alloc_lock){+.+.}-{2:2} [ 37.019886][ T345] [ 37.019886][ T345] but this new dependency connects a SOFTIRQ-irq-safe lock: [ 37.020119][ T345] (&ndev->lock){++--}-{2:2} [ 37.020123][ T345] [ 37.020123][ T345] ... which became SOFTIRQ-irq-safe at: [ 37.020472][ T345] __lock_acquire+0x797/0x1570 [ 37.020619][ T345] lock_acquire.part.0+0xeb/0x330 [ 37.020768][ T345] _raw_write_lock+0x30/0x40 [ 37.020942][ T345] addrconf_rs_timer+0xa9/0x730 [ 37.021080][ T345] call_timer_fn+0x13b/0x230 [ 37.021219][ T345] __run_timers+0x545/0x810 [ 37.021356][ T345] run_timer_softirq+0xe8/0x1b0 [ 37.021518][ T345] __do_softirq+0x1f8/0x5df [ 37.021662][ T345] irq_exit_rcu+0x97/0xc0 [ 37.021801][ T345] sysvec_apic_timer_interrupt+0x75/0x80 [ 37.021947][ T345] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 37.022142][ T345] default_idle+0xf/0x20 [ 37.022254][ T345] default_idle_call+0x6d/0xb0 [ 37.022415][ T345] cpuidle_idle_call+0x1f4/0x280 [ 37.022578][ T345] do_idle+0xf9/0x160 [ 37.022687][ T345] cpu_startup_entry+0x54/0x60 [ 37.022839][ T345] rest_init+0x14f/0x260 [ 37.022951][ T345] start_kernel+0x318/0x3d0 [ 37.023134][ T345] x86_64_start_reservations+0x18/0x30 [ 37.023282][ T345] x86_64_start_kernel+0xba/0x110 [ 37.023433][ T345] common_startup_64+0x12c/0x138 [ 37.023577][ T345] [ 37.023577][ T345] to a SOFTIRQ-irq-unsafe lock: [ 37.023785][ T345] (&p->alloc_lock){+.+.}-{2:2} [ 37.023790][ T345] [ 37.023790][ T345] ... which became SOFTIRQ-irq-unsafe at: [ 37.024144][ T345] ... [ 37.024146][ T345] __lock_acquire+0x797/0x1570 [ 37.024367][ T345] lock_acquire.part.0+0xeb/0x330 [ 37.024524][ T345] _raw_spin_lock+0x30/0x40 [ 37.024736][ T345] set_mems_allowed+0x1d/0x210 [ 37.024909][ T345] kernel_init_freeable+0x72/0x310 [ 37.025067][ T345] kernel_init+0x20/0x200 [ 37.025227][ T345] ret_from_fork+0x31/0x70 [ 37.025386][ T345] ret_from_fork_asm+0x1a/0x30 [ 37.025573][ T345] [ 37.025573][ T345] other info that might help us debug this: [ 37.025573][ T345] [ 37.025848][ T345] Possible interrupt unsafe locking scenario: [ 37.025848][ T345] [ 37.026074][ T345] CPU0 CPU1 [ 37.026228][ T345] ---- ---- [ 37.026382][ T345] lock(&p->alloc_lock); [ 37.026500][ T345] local_irq_disable(); [ 37.026683][ T345] lock(&ndev->lock); [ 37.026865][ T345] lock(&p->alloc_lock); [ 37.027052][ T345] [ 37.027159][ T345] lock(&ndev->lock); [ 37.027297][ T345] [ 37.027297][ T345] *** DEADLOCK *** [ 37.027297][ T345] [ 37.027529][ T345] 3 locks held by sysctl/345: [ 37.027671][ T345] #0: ffff8880128313f0 (sb_writers#7){.+.+}-{0:0}, at: ksys_write+0xf5/0x1e0 [ 37.027949][ T345] #1: ffffffff9c1969c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_fixup_forwarding+0x20/0x460 [ 37.028276][ T345] #2: ffff888005565580 (&ndev->lock){++--}-{2:2}, at: __ipv6_dev_ac_inc+0x42/0xb10 [ 37.028536][ T345] [ 37.028536][ T345] the dependencies between SOFTIRQ-irq-safe lock and the holding lock: [ 37.028830][ T345] -> (&ndev->lock){++--}-{2:2} { [ 37.028988][ T345] HARDIRQ-ON-W at: [ 37.029103][ T345] __lock_acquire+0x797/0x1570 [ 37.029283][ T345] lock_acquire.part.0+0xeb/0x330 [ 37.029459][ T345] _raw_write_lock_bh+0x38/0x50 [ 37.029636][ T345] addrconf_permanent_addr+0x6e/0x670 [ 37.029815][ T345] addrconf_notify+0x749/0xd60 [ 37.030003][ T345] notifier_call_chain+0xcd/0x150 [ 37.030186][ T345] __dev_notify_flags+0xe6/0x250 [ 37.030360][ T345] dev_change_flags+0xec/0x160 [ 37.030555][ T345] do_setlink+0x7d6/0x21e0 [ 37.030737][ T345] __rtnl_newlink+0xaa7/0xd80 [ 37.030928][ T345] rtnl_newlink+0x63/0xa0 [ 37.031124][ T345] rtnetlink_rcv_msg+0x2fb/0xbf0 [ 37.031312][ T345] netlink_rcv_skb+0x130/0x360 [ 37.031507][ T345] netlink_unicast+0x449/0x710 [ 37.031702][ T345] netlink_sendmsg+0x723/0xbe0 [ 37.031893][ T345] ____sys_sendmsg+0x7b2/0xa10 [ 37.032090][ T345] ___sys_sendmsg+0xee/0x170 [ 37.032276][ T345] __sys_sendmsg+0xcd/0x170 [ 37.032469][ T345] do_syscall_64+0xc6/0x1e0 [ 37.032659][ T345] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 37.032886][ T345] HARDIRQ-ON-R at: [ 37.033011][ T345] __lock_acquire+0x797/0x1570 [ 37.033192][ T345] lock_acquire.part.0+0xeb/0x330 [ 37.033374][ T345] _raw_read_lock_bh+0x44/0x80 [ 37.033571][ T345] inet6_fill_ifla6_attrs+0x516/0x740 [ 37.033764][ T345] inet6_fill_link_af+0x5e/0xe0 [ 37.033965][ T345] rtnl_fill_ifinfo+0x1612/0x29e0 [ 37.034171][ T345] rtmsg_ifinfo_build_skb+0x13c/0x240 [ 37.034379][ T345] rtmsg_ifinfo_event.part.0+0x2d/0x120 [ 37.034645][ T345] rtmsg_ifinfo+0x5b/0xa0 [ 37.034837][ T345] register_netdevice+0x1177/0x1690 [ 37.035022][ T345] register_netdev+0x20/0x40 [ 37.035199][ T345] sit_init_net+0x250/0x4f0 [ 37.035382][ T345] ops_init+0x9b/0x560 [ 37.035531][ T345] register_pernet_operations+0x2db/0x710 [ 37.035738][ T345] register_pernet_device+0x2a/0x60 [ 37.035913][ T345] sit_init+0x23/0xe0 [ 37.036080][ T345] do_one_initcall+0x8d/0x1e0 [ 37.036267][ T345] do_initcalls+0x1b2/0x3e0 [ 37.036453][ T345] kernel_init_freeable+0x232/0x310 [ 37.036642][ T345] kernel_init+0x20/0x200 [ 37.036828][ T345] ret_from_fork+0x31/0x70 [ 37.037007][ T345] ret_from_fork_asm+0x1a/0x30 [ 37.037209][ T345] IN-SOFTIRQ-W at: [ 37.037316][ T345] __lock_acquire+0x797/0x1570 [ 37.037510][ T345] lock_acquire.part.0+0xeb/0x330 [ 37.037687][ T345] _raw_write_lock+0x30/0x40 [ 37.037878][ T345] addrconf_rs_timer+0xa9/0x730 [ 37.038077][ T345] call_timer_fn+0x13b/0x230 [ 37.038264][ T345] __run_timers+0x545/0x810 [ 37.038468][ T345] run_timer_softirq+0xe8/0x1b0 [ 37.038664][ T345] __do_softirq+0x1f8/0x5df [ 37.038867][ T345] irq_exit_rcu+0x97/0xc0 [ 37.039059][ T345] sysvec_apic_timer_interrupt+0x75/0x80 [ 37.039294][ T345] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 37.039500][ T345] default_idle+0xf/0x20 [ 37.039692][ T345] default_idle_call+0x6d/0xb0 [ 37.039881][ T345] cpuidle_idle_call+0x1f4/0x280 [ 37.040057][ T345] do_idle+0xf9/0x160 [ 37.040204][ T345] cpu_startup_entry+0x54/0x60 [ 37.040383][ T345] rest_init+0x14f/0x260 [ 37.040562][ T345] start_kernel+0x318/0x3d0 [ 37.040744][ T345] x86_64_start_reservations+0x18/0x30 [ 37.040929][ T345] x86_64_start_kernel+0xba/0x110 [ 37.041107][ T345] common_startup_64+0x12c/0x138 [ 37.041292][ T345] IN-SOFTIRQ-R at: [ 37.041400][ T345] __lock_acquire+0x797/0x1570 [ 37.041585][ T345] lock_acquire.part.0+0xeb/0x330 [ 37.041772][ T345] _raw_read_lock_bh+0x44/0x80 [ 37.041947][ T345] ipv6_get_lladdr+0xa9/0x3e0 [ 37.042128][ T345] addrconf_rs_timer+0x24a/0x730 [ 37.042308][ T345] call_timer_fn+0x13b/0x230 [ 37.042492][ T345] __run_timers+0x545/0x810 [ 37.042684][ T345] run_timer_softirq+0xe8/0x1b0 [ 37.042858][ T345] __do_softirq+0x1f8/0x5df [ 37.043048][ T345] irq_exit_rcu+0x97/0xc0 [ 37.043234][ T345] sysvec_apic_timer_interrupt+0x75/0x80 [ 37.043452][ T345] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 37.043775][ T345] default_idle+0xf/0x20 [ 37.043976][ T345] default_idle_call+0x6d/0xb0 [ 37.044158][ T345] cpuidle_idle_call+0x1f4/0x280 [ 37.044340][ T345] do_idle+0xf9/0x160 [ 37.044565][ T345] cpu_startup_entry+0x54/0x60 [ 37.044770][ T345] rest_init+0x14f/0x260 [ 37.044965][ T345] start_kernel+0x318/0x3d0 [ 37.045246][ T345] x86_64_start_reservations+0x18/0x30 [ 37.045440][ T345] x86_64_start_kernel+0xba/0x110 [ 37.045627][ T345] common_startup_64+0x12c/0x138 [ 37.045815][ T345] INITIAL USE at: [ 37.046004][ T345] __lock_acquire+0x797/0x1570 [ 37.046199][ T345] lock_acquire.part.0+0xeb/0x330 [ 37.046375][ T345] _raw_write_lock_bh+0x38/0x50 [ 37.046640][ T345] addrconf_permanent_addr+0x6e/0x670 [ 37.046825][ T345] addrconf_notify+0x749/0xd60 [ 37.047003][ T345] notifier_call_chain+0xcd/0x150 [ 37.047186][ T345] __dev_notify_flags+0xe6/0x250 [ 37.047540][ T345] dev_change_flags+0xec/0x160 [ 37.047725][ T345] do_setlink+0x7d6/0x21e0 [ 37.047900][ T345] __rtnl_newlink+0xaa7/0xd80 [ 37.048175][ T345] rtnl_newlink+0x63/0xa0 [ 37.048383][ T345] rtnetlink_rcv_msg+0x2fb/0xbf0 [ 37.048565][ T345] netlink_rcv_skb+0x130/0x360 [ 37.048740][ T345] netlink_unicast+0x449/0x710 [ 37.049010][ T345] netlink_sendmsg+0x723/0xbe0 [ 37.049197][ T345] ____sys_sendmsg+0x7b2/0xa10 [ 37.049381][ T345] ___sys_sendmsg+0xee/0x170 [ 37.049642][ T345] __sys_sendmsg+0xcd/0x170 [ 37.049825][ T345] do_syscall_64+0xc6/0x1e0 [ 37.050001][ T345] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 37.050308][ T345] INITIAL READ USE at: [ 37.050415][ T345] __lock_acquire+0x797/0x1570 [ 37.050598][ T345] lock_acquire.part.0+0xeb/0x330 [ 37.050777][ T345] _raw_read_lock_bh+0x44/0x80 [ 37.051049][ T345] inet6_fill_ifla6_attrs+0x516/0x740 [ 37.051264][ T345] inet6_fill_link_af+0x5e/0xe0 [ 37.051467][ T345] rtnl_fill_ifinfo+0x1612/0x29e0 [ 37.051738][ T345] rtmsg_ifinfo_build_skb+0x13c/0x240 [ 37.051988][ T345] rtmsg_ifinfo_event.part.0+0x2d/0x120 [ 37.052212][ T345] rtmsg_ifinfo+0x5b/0xa0 [ 37.052483][ T345] register_netdevice+0x1177/0x1690 [ 37.052695][ T345] register_netdev+0x20/0x40 [ 37.052878][ T345] sit_init_net+0x250/0x4f0 [ 37.053191][ T345] ops_init+0x9b/0x560 [ 37.053378][ T345] register_pernet_operations+0x2db/0x710 [ 37.053587][ T345] register_pernet_device+0x2a/0x60 [ 37.054030][ T345] sit_init+0x23/0xe0 [ 37.054203][ T345] do_one_initcall+0x8d/0x1e0 [ 37.054426][ T345] do_initcalls+0x1b2/0x3e0 [ 37.054628][ T345] kernel_init_freeable+0x232/0x310 [ 37.054946][ T345] kernel_init+0x20/0x200 [ 37.055149][ T345] ret_from_fork+0x31/0x70 [ 37.055324][ T345] ret_from_fork_asm+0x1a/0x30 [ 37.055579][ T345] } [ 37.055660][ T345] ... key at: [] __key.37+0x0/0x40 [ 37.055888][ T345] [ 37.055888][ T345] the dependencies between the lock to be acquired [ 37.055889][ T345] and SOFTIRQ-irq-unsafe lock: [ 37.056384][ T345] -> (&p->alloc_lock){+.+.}-{2:2} { [ 37.056529][ T345] HARDIRQ-ON-W at: [ 37.056636][ T345] __lock_acquire+0x797/0x1570 [ 37.056829][ T345] lock_acquire.part.0+0xeb/0x330 [ 37.057093][ T345] _raw_spin_lock+0x30/0x40 [ 37.057276][ T345] set_mems_allowed+0x1d/0x210 [ 37.057450][ T345] kernel_init_freeable+0x72/0x310 [ 37.057724][ T345] kernel_init+0x20/0x200 [ 37.057904][ T345] ret_from_fork+0x31/0x70 [ 37.058122][ T345] ret_from_fork_asm+0x1a/0x30 [ 37.058391][ T345] SOFTIRQ-ON-W at: [ 37.058497][ T345] __lock_acquire+0x797/0x1570 [ 37.058682][ T345] lock_acquire.part.0+0xeb/0x330 [ 37.058857][ T345] _raw_spin_lock+0x30/0x40 [ 37.059233][ T345] set_mems_allowed+0x1d/0x210 [ 37.059425][ T345] kernel_init_freeable+0x72/0x310 [ 37.059605][ T345] kernel_init+0x20/0x200 [ 37.059829][ T345] ret_from_fork+0x31/0x70 [ 37.060111][ T345] ret_from_fork_asm+0x1a/0x30 [ 37.060305][ T345] INITIAL USE at: [ 37.060424][ T345] __lock_acquire+0x797/0x1570 [ 37.060709][ T345] lock_acquire.part.0+0xeb/0x330 [ 37.060905][ T345] _raw_spin_lock+0x30/0x40 [ 37.061112][ T345] set_mems_allowed+0x1d/0x210 [ 37.061304][ T345] kernel_init_freeable+0x72/0x310 [ 37.061507][ T345] kernel_init+0x20/0x200 [ 37.061707][ T345] ret_from_fork+0x31/0x70 [ 37.061911][ T345] ret_from_fork_asm+0x1a/0x30 [ 37.062198][ T345] } [ 37.062286][ T345] ... key at: [] __key.387+0x0/0x40 [ 37.062525][ T345] ... acquired at: [ 37.062646][ T345] check_prev_add+0x194/0xce0 [ 37.062801][ T345] validate_chain+0x71d/0x9b0 [ 37.063051][ T345] __lock_acquire+0xaf0/0x1570 [ 37.063216][ T345] lock_acquire.part.0+0xeb/0x330 [ 37.063372][ T345] _raw_spin_lock+0x30/0x40 [ 37.063542][ T345] __get_task_comm+0x27/0x70 [ 37.063795][ T345] ref_tracker_alloc+0x2ee/0x490 [ 37.063954][ T345] netdev_get_by_index+0x5e/0x80 [ 37.064116][ T345] fib6_nh_init+0x3d8/0x15b0 [ 37.064275][ T345] ip6_route_info_create+0xf18/0x17d0 [ 37.064513][ T345] addrconf_f6i_alloc+0x265/0x560 [ 37.064668][ T345] __ipv6_dev_ac_inc+0x25f/0xb10 [ 37.064825][ T345] addrconf_join_anycast+0x1c0/0x220 [ 37.064977][ T345] dev_forward_change+0x2a6/0x7b0 [ 37.065219][ T345] addrconf_fixup_forwarding+0x23f/0x460 [ 37.065411][ T345] addrconf_sysctl_forward+0x212/0x2b0 [ 37.065570][ T345] proc_sys_call_handler+0x403/0x5e0 [ 37.065723][ T345] vfs_write+0x9e5/0x10a0 [ 37.065967][ T345] ksys_write+0xf5/0x1e0 [ 37.066123][ T345] do_syscall_64+0xc6/0x1e0 [ 37.066283][ T345] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 37.066487][ T345] [ 37.066567][ T345] [ 37.066567][ T345] stack backtrace: [ 37.066850][ T345] CPU: 0 PID: 345 Comm: sysctl Not tainted 6.9.0-rc1-virtme #1 [ 37.067089][ T345] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 37.067522][ T345] Call Trace: [ 37.067638][ T345] [ 37.067726][ T345] dump_stack_lvl+0x82/0xd0 [ 37.067879][ T345] print_bad_irq_dependency+0x957/0xd40 [ 37.068041][ T345] ? hlock_class+0x4e/0x130 [ 37.068271][ T345] ? __pfx_print_bad_irq_dependency+0x10/0x10 [ 37.068457][ T345] ? __pfx_usage_skip+0x10/0x10 [ 37.068593][ T345] ? __bfs+0x246/0x650 [ 37.068702][ T345] ? __pfx_usage_match+0x10/0x10 [ 37.068927][ T345] check_irq_usage+0x596/0x850 [ 37.069072][ T345] ? __pfx_check_irq_usage+0x10/0x10 [ 37.069224][ T345] ? __bfs+0x246/0x650 [ 37.069327][ T345] ? __pfx_hlock_conflict+0x10/0x10 [ 37.069488][ T345] ? check_path.constprop.0+0x24/0x50 [ 37.069703][ T345] ? check_noncircular+0x14c/0x3e0 [ 37.069854][ T345] ? __pfx_check_noncircular+0x10/0x10 [ 37.069996][ T345] ? check_prev_add+0x194/0xce0 [ 37.070145][ T345] check_prev_add+0x194/0xce0 [ 37.070377][ T345] ? validate_chain+0x130/0x9b0 [ 37.070518][ T345] validate_chain+0x71d/0x9b0 [ 37.070665][ T345] ? mark_lock+0x38/0x3e0 [ 37.070770][ T345] ? __pfx_validate_chain+0x10/0x10 [ 37.070905][ T345] ? hlock_class+0x4e/0x130 [ 37.071203][ T345] ? mark_lock+0x38/0x3e0 [ 37.071307][ T345] __lock_acquire+0xaf0/0x1570 [ 37.071450][ T345] lock_acquire.part.0+0xeb/0x330 [ 37.071594][ T345] ? __get_task_comm+0x27/0x70 [ 37.071827][ T345] ? mark_lock+0x38/0x3e0 [ 37.071943][ T345] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 37.072079][ T345] ? trace_lock_acquire+0x135/0x1c0 [ 37.072213][ T345] ? __get_task_comm+0x27/0x70 [ 37.072353][ T345] ? lock_acquire+0x32/0xc0 [ 37.072581][ T345] ? __get_task_comm+0x27/0x70 [ 37.072732][ T345] _raw_spin_lock+0x30/0x40 [ 37.072872][ T345] ? __get_task_comm+0x27/0x70 [ 37.073016][ T345] __get_task_comm+0x27/0x70 [ 37.073245][ T345] ref_tracker_alloc+0x2ee/0x490 [ 37.073390][ T345] ? __pfx_ref_tracker_alloc+0x10/0x10 [ 37.073532][ T345] ? dev_get_by_index+0x177/0x270 [ 37.073781][ T345] ? netdev_get_by_index+0x5e/0x80 [ 37.074009][ T345] ? fib6_nh_init+0x3d8/0x15b0 [ 37.074152][ T345] ? ip6_route_info_create+0xf18/0x17d0 [ 37.074300][ T345] ? addrconf_f6i_alloc+0x265/0x560 [ 37.074445][ T345] ? __ipv6_dev_ac_inc+0x25f/0xb10 [ 37.074681][ T345] ? addrconf_join_anycast+0x1c0/0x220 [ 37.074826][ T345] ? dev_forward_change+0x2a6/0x7b0 [ 37.074974][ T345] ? addrconf_fixup_forwarding+0x23f/0x460 [ 37.075157][ T345] ? addrconf_sysctl_forward+0x212/0x2b0 [ 37.075375][ T345] ? proc_sys_call_handler+0x403/0x5e0 [ 37.075526][ T345] ? vfs_write+0x9e5/0x10a0 [ 37.075680][ T345] ? ksys_write+0xf5/0x1e0 [ 37.075831][ T345] ? do_syscall_64+0xc6/0x1e0 [ 37.075972][ T345] ? entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 37.076236][ T345] ? dev_get_by_index+0x177/0x270 [ 37.076389][ T345] netdev_get_by_index+0x5e/0x80 [ 37.076526][ T345] fib6_nh_init+0x3d8/0x15b0 [ 37.076675][ T345] ? lockdep_hardirqs_on_prepare.part.0+0x14f/0x370 [ 37.076941][ T345] ? __pfx_fib6_nh_init+0x10/0x10 [ 37.077084][ T345] ? kasan_save_track+0x14/0x30 [ 37.077240][ T345] ? __kasan_kmalloc+0x7f/0x90 [ 37.077385][ T345] ? __kmalloc+0x1d7/0x3c0 [ 37.077607][ T345] ? fib6_get_table+0x116/0x290 [ 37.077761][ T345] ip6_route_info_create+0xf18/0x17d0 [ 37.077916][ T345] ? __lock_release+0x103/0x460 [ 37.078057][ T345] ? __pfx_ip6_route_info_create+0x10/0x10 [ 37.078324][ T345] ? addrconf_f6i_alloc+0x12d/0x560 [ 37.078480][ T345] addrconf_f6i_alloc+0x265/0x560 [ 37.078619][ T345] ? __pfx_addrconf_f6i_alloc+0x10/0x10 [ 37.078773][ T345] ? do_raw_write_lock+0x122/0x3b0 [ 37.078992][ T345] ? __pfx_do_raw_write_lock+0x10/0x10 [ 37.079131][ T345] ? lock_acquire+0x32/0xc0 [ 37.079272][ T345] __ipv6_dev_ac_inc+0x25f/0xb10 [ 37.079411][ T345] addrconf_join_anycast+0x1c0/0x220 [ 37.079635][ T345] ? mark_lock+0x38/0x3e0 [ 37.079739][ T345] ? __pfx_addrconf_join_anycast+0x10/0x10 [ 37.079920][ T345] ? lockdep_hardirqs_on_prepare.part.0+0x1af/0x370 [ 37.080101][ T345] dev_forward_change+0x2a6/0x7b0 [ 37.080323][ T345] ? __pfx_dev_forward_change+0x10/0x10 [ 37.080466][ T345] addrconf_fixup_forwarding+0x23f/0x460 [ 37.080604][ T345] addrconf_sysctl_forward+0x212/0x2b0 [ 37.080750][ T345] ? __pfx_addrconf_sysctl_forward+0x10/0x10 [ 37.081017][ T345] ? __pfx_addrconf_sysctl_forward+0x10/0x10 [ 37.081188][ T345] ? trace_kmalloc+0x2a/0xe0 [ 37.081330][ T345] ? __kmalloc_node+0x220/0x400 [ 37.081467][ T345] ? proc_sys_call_handler+0x30b/0x5e0 [ 37.081697][ T345] proc_sys_call_handler+0x403/0x5e0 [ 37.081840][ T345] ? __pfx_proc_sys_call_handler+0x10/0x10 [ 37.082008][ T345] ? __lock_acquire+0xaf0/0x1570 [ 37.082150][ T345] vfs_write+0x9e5/0x10a0 [ 37.082425][ T345] ? do_user_addr_fault+0x449/0xbe0 [ 37.082566][ T345] ? __pfx_vfs_write+0x10/0x10 [ 37.082719][ T345] ? find_held_lock+0x2c/0x110 [ 37.082858][ T345] ? __pfx___lock_release+0x10/0x10 [ 37.083003][ T345] ? __fget_light+0x53/0x1e0 [ 37.083226][ T345] ksys_write+0xf5/0x1e0 [ 37.083337][ T345] ? __pfx_ksys_write+0x10/0x10 [ 37.083476][ T345] ? do_user_addr_fault+0x4bd/0xbe0 [ 37.083629][ T345] do_syscall_64+0xc6/0x1e0 [ 37.083859][ T345] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 37.084058][ T345] RIP: 0033:0x7f4fad9a3957 [ 37.084219][ T345] 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 [ 37.084849][ T345] RSP: 002b:00007ffd37a18558 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 37.085075][ T345] RAX: ffffffffffffffda RBX: 000055ab5f625360 RCX: 00007f4fad9a3957 [ 37.085391][ T345] RDX: 0000000000000002 RSI: 000055ab5f6253a0 RDI: 0000000000000005 [ 37.085631][ T345] RBP: 000055ab5f6274d0 R08: 0000000000000003 R09: 0000000000000077 [ 37.085861][ T345] R10: 000000000000006b R11: 0000000000000246 R12: 0000000000000002 [ 37.086185][ T345] R13: 0000000000000002 R14: 0000000000000002 R15: 00007f4fada5a9c0 [ 37.086444][ T345] WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr