====================================== | [ 24.655408][ T10] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 24.655545][ T10] | [ 24.655616][ T10] | [ 24.655616][ T10] stack backtrace: [ 24.656106][ T10] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 24.656407][ T10] Workqueue: netns cleanup_net [ 24.656549][ T10] Call Trace: [ 24.656670][ T10] [ 24.656745][ T10] dump_stack_lvl (lib/dump_stack.c:117) [ 24.656889][ T10] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 24.657026][ T10] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 24.657199][ T10] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 24.657344][ T10] ? __bfs (kernel/locking/lockdep.c:1787) [ 24.657450][ T10] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 24.657587][ T10] check_irq_usage (kernel/locking/lockdep.c:2871) [ 24.657728][ T10] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 24.657879][ T10] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 24.658096][ T10] ? __bfs (kernel/locking/lockdep.c:1787) [ 24.658196][ T10] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 24.658343][ T10] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 24.658482][ T10] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 24.658618][ T10] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 24.658766][ T10] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 24.658903][ T10] check_prev_add (kernel/locking/lockdep.c:3138) [ 24.659042][ T10] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 24.659258][ T10] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 24.659398][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 24.659502][ T10] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 24.659641][ T10] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) [ 24.659776][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 24.659982][ T10] __lock_acquire (kernel/locking/lockdep.c:5137) [ 24.660120][ T10] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 24.660257][ T10] ? __get_task_comm (fs/exec.c:1234) [ 24.660390][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 24.660490][ T10] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 24.660705][ T10] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 24.660837][ T10] ? __get_task_comm (fs/exec.c:1234) [ 24.660966][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 24.661094][ T10] ? __get_task_comm (fs/exec.c:1234) [ 24.661375][ T10] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 24.661507][ T10] ? __get_task_comm (fs/exec.c:1234) [ 24.661639][ T10] __get_task_comm (fs/exec.c:1234) [ 24.661772][ T10] ref_tracker_alloc (lib/ref_tracker.c:217) [ 24.661979][ T10] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 24.662107][ T10] ? __lock_release (kernel/locking/lockdep.c:5430) [ 24.662235][ T10] ? rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 24.662394][ T10] ? rt6_disable_ip (net/ipv6/route.c:4910) [ 24.662595][ T10] ? addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 24.662724][ T10] ? addrconf_notify (net/ipv6/addrconf.c:3811) [ 24.662851][ T10] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 24.662980][ T10] ? dev_close_many (net/core/dev.c:1571) [ 24.663198][ T10] ? unregister_netdevice_many_notify (net/core/dev.c:11146) [ 24.663364][ T10] ? default_device_exit_batch (net/core/dev.c:11707) [ 24.663528][ T10] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 24.663659][ T10] ? process_one_work (kernel/workqueue.c:3254) [ 24.663865][ T10] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 24.663996][ T10] ? kthread (kernel/kthread.c:388) [ 24.664097][ T10] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 24.664225][ T10] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 24.664357][ T10] ? in6_dev_get (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/addrconf.h:373) [ 24.664562][ T10] rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 24.664723][ T10] rt6_disable_ip (net/ipv6/route.c:4910) [ 24.664851][ T10] ? __pfx_rt6_disable_ip (net/ipv6/route.c:4907) [ 24.664980][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 24.665176][ T10] addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 24.665312][ T10] ? __try_to_del_timer_sync (kernel/time/timer.c:1500) [ 24.665452][ T10] ? __pfx_addrconf_ifdown.isra.0 (net/ipv6/addrconf.c:3841) [ 24.665624][ T10] addrconf_notify (net/ipv6/addrconf.c:3811) [ 24.665757][ T10] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 24.665904][ T10] dev_close_many (net/core/dev.c:1571) [ 24.666041][ T10] ? __pfx_dev_close_many (net/core/dev.c:1558) [ 24.666176][ T10] ? default_device_exit_batch (net/core/dev.c:11693) [ 24.666389][ T10] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 52)) [ 24.666538][ T10] unregister_netdevice_many_notify (net/core/dev.c:11146) [ 24.666708][ T10] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3189 kernel/locking/mutex.c:81 kernel/locking/mutex.c:91) [ 24.666845][ T10] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 24.667124][ T10] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 24.667293][ T10] default_device_exit_batch (net/core/dev.c:11707) [ 24.667429][ T10] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 24.667603][ T10] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 24.667739][ T10] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 24.667879][ T10] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 24.668011][ T10] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 24.668144][ T10] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 24.668355][ T10] ? process_one_work (kernel/workqueue.c:3230) [ 24.668489][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 24.668620][ T10] ? process_one_work (kernel/workqueue.c:3230) [ 24.668782][ T10] process_one_work (kernel/workqueue.c:3254) [ 24.669181][ T10] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 24.669325][ T10] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 24.669466][ T10] ? assign_work (kernel/workqueue.c:1209) [ 24.669602][ T10] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 24.669744][ T10] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 24.669882][ T10] kthread (kernel/kthread.c:388) [ 24.669984][ T10] ? __pfx_kthread (kernel/kthread.c:341) [ 24.670122][ T10] ret_from_fork (arch/x86/kernel/process.c:147) [ 24.670251][ T10] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage