====================================== | [ 60.474909][ T72] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 60.475050][ T72] | [ 60.475118][ T72] | [ 60.475118][ T72] stack backtrace: [ 60.475503][ T72] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 60.475896][ T72] Workqueue: netns cleanup_net [ 60.476043][ T72] Call Trace: [ 60.476155][ T72] [ 60.476230][ T72] dump_stack_lvl (lib/dump_stack.c:117) [ 60.476464][ T72] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 60.476607][ T72] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 60.476796][ T72] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 60.476936][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 60.477042][ T72] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 60.477183][ T72] check_irq_usage (kernel/locking/lockdep.c:2871) [ 60.477403][ T72] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 60.477548][ T72] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 60.477692][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 60.477794][ T72] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 60.478016][ T72] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 60.478248][ T72] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 60.478389][ T72] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 60.478532][ T72] ? find_held_lock (kernel/locking/lockdep.c:5244) [ 60.478672][ T72] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 60.478897][ T72] check_prev_add (kernel/locking/lockdep.c:3138) [ 60.479051][ T72] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 60.479196][ T72] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 60.479339][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 60.479434][ T72] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 60.479646][ T72] ? 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) [ 60.479786][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 60.479895][ T72] __lock_acquire (kernel/locking/lockdep.c:5137) [ 60.480113][ T72] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 60.480327][ T72] ? __get_task_comm (fs/exec.c:1234) [ 60.480464][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 60.480574][ T72] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 60.480715][ T72] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 60.480859][ T72] ? __get_task_comm (fs/exec.c:1234) [ 60.481072][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 60.481212][ T72] ? __get_task_comm (fs/exec.c:1234) [ 60.481351][ T72] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 60.481570][ T72] ? __get_task_comm (fs/exec.c:1234) [ 60.481711][ T72] __get_task_comm (fs/exec.c:1234) [ 60.481933][ T72] ref_tracker_alloc (lib/ref_tracker.c:217) [ 60.482072][ T72] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 60.482214][ T72] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 60.482357][ T72] ? rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) [ 60.482502][ T72] ? fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 60.482736][ T72] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 60.482876][ T72] ? unregister_netdevice_many_notify (net/core/dev.c:11171) [ 60.483046][ T72] ? default_device_exit_batch (net/core/dev.c:11707) [ 60.483221][ T72] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 60.483365][ T72] ? process_one_work (kernel/workqueue.c:3254) [ 60.483505][ T72] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 60.483644][ T72] ? kthread (kernel/kthread.c:388) [ 60.483749][ T72] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 60.483886][ T72] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 60.484025][ T72] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:115 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) [ 60.484170][ T72] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) [ 60.484393][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 60.484533][ T72] ? rt_flush_dev (net/ipv4/route.c:1551) [ 60.484676][ T72] rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) [ 60.484818][ T72] ? __timer_delete_sync (kernel/time/timer.c:1648 (discriminator 1)) [ 60.485044][ T72] ? __timer_delete_sync (kernel/time/timer.c:1668 (discriminator 34)) [ 60.485185][ T72] fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 60.485324][ T72] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 60.485465][ T72] unregister_netdevice_many_notify (net/core/dev.c:11171) [ 60.485735][ T72] ? 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) [ 60.485876][ T72] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 60.486049][ T72] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 60.486224][ T72] default_device_exit_batch (net/core/dev.c:11707) [ 60.486362][ T72] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 60.486532][ T72] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 60.486672][ T72] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 60.486837][ T72] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 60.487049][ T72] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 60.487186][ T72] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 60.487323][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 60.487459][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 60.487669][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 60.487807][ T72] process_one_work (kernel/workqueue.c:3254) [ 60.487957][ T72] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 60.488099][ T72] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 60.488310][ T72] ? assign_work (kernel/workqueue.c:1209) [ 60.488447][ T72] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 60.488585][ T72] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 60.488755][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 60.488963][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 60.489100][ T72] kthread (kernel/kthread.c:388) [ 60.489205][ T72] ? __pfx_kthread (kernel/kthread.c:341) [ 60.489344][ T72] ret_from_fork (arch/x86/kernel/process.c:147) [ 60.489482][ T72] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage