====================================== | [ 58.620812][ T71] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 58.620940][ T71] | [ 58.621005][ T71] | [ 58.621005][ T71] stack backtrace: [ 58.621348][ T71] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 58.621629][ T71] Workqueue: netns cleanup_net [ 58.621835][ T71] Call Trace: [ 58.621937][ T71] [ 58.622004][ T71] dump_stack_lvl (lib/dump_stack.c:117) [ 58.622136][ T71] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 58.622264][ T71] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 58.622495][ T71] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 58.622622][ T71] ? __bfs (kernel/locking/lockdep.c:1787) [ 58.622717][ T71] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 58.622844][ T71] check_irq_usage (kernel/locking/lockdep.c:2871) [ 58.623044][ T71] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 58.623172][ T71] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 58.623298][ T71] ? __bfs (kernel/locking/lockdep.c:1787) [ 58.623394][ T71] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 58.623522][ T71] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 58.623722][ T71] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 58.623855][ T71] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 58.623981][ T71] ? find_held_lock (kernel/locking/lockdep.c:5244) [ 58.624109][ T71] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 58.624307][ T71] check_prev_add (kernel/locking/lockdep.c:3138) [ 58.624435][ T71] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 58.624562][ T71] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 58.624690][ T71] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 58.624785][ T71] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 58.624985][ T71] ? 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) [ 58.625113][ T71] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 58.625210][ T71] __lock_acquire (kernel/locking/lockdep.c:5137) [ 58.625340][ T71] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 58.625538][ T71] ? __get_task_comm (fs/exec.c:1234) [ 58.625663][ T71] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 58.625759][ T71] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 58.625887][ T71] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 58.626016][ T71] ? __get_task_comm (fs/exec.c:1234) [ 58.626215][ T71] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 58.626344][ T71] ? __get_task_comm (fs/exec.c:1234) [ 58.626472][ T71] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 58.626599][ T71] ? __get_task_comm (fs/exec.c:1234) [ 58.626798][ T71] __get_task_comm (fs/exec.c:1234) [ 58.626925][ T71] ref_tracker_alloc (lib/ref_tracker.c:217) [ 58.627054][ T71] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 58.627180][ T71] ? rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) [ 58.627386][ T71] ? fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 58.627512][ T71] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 58.627638][ T71] ? unregister_netdevice_many_notify (net/core/dev.c:11171) [ 58.627794][ T71] ? default_device_exit_batch (net/core/dev.c:11707) [ 58.627952][ T71] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 58.628079][ T71] ? process_one_work (kernel/workqueue.c:3254) [ 58.628206][ T71] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 58.628341][ T71] ? kthread (kernel/kthread.c:388) [ 58.628439][ T71] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 58.628565][ T71] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 58.628694][ T71] rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) [ 58.628820][ T71] ? __timer_delete_sync (kernel/time/timer.c:1648 (discriminator 1)) [ 58.628948][ T71] ? __timer_delete_sync (kernel/time/timer.c:1668 (discriminator 34)) [ 58.629215][ T71] fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 58.629340][ T71] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 58.629468][ T71] unregister_netdevice_many_notify (net/core/dev.c:11171) [ 58.629627][ T71] ? 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) [ 58.629825][ T71] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 58.629980][ T71] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 58.630139][ T71] default_device_exit_batch (net/core/dev.c:11707) [ 58.630350][ T71] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 58.630506][ T71] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 58.630634][ T71] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 58.630760][ T71] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 58.630888][ T71] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 58.631013][ T71] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 58.631139][ T71] ? process_one_work (kernel/workqueue.c:3230) [ 58.631265][ T71] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 58.631391][ T71] ? process_one_work (kernel/workqueue.c:3230) [ 58.631519][ T71] process_one_work (kernel/workqueue.c:3254) [ 58.631647][ T71] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 58.631773][ T71] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 58.631904][ T71] ? assign_work (kernel/workqueue.c:1209) [ 58.632107][ T71] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 58.632234][ T71] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 58.632393][ T71] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 58.632519][ T71] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 58.632716][ T71] kthread (kernel/kthread.c:388) [ 58.632813][ T71] ? __pfx_kthread (kernel/kthread.c:341) [ 58.632940][ T71] ret_from_fork (arch/x86/kernel/process.c:147) [ 58.633066][ T71] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage