====================================== | [ 69.009722][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 69.009931][ T70] | [ 69.010009][ T70] | [ 69.010009][ T70] stack backtrace: [ 69.010387][ T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 69.010768][ T70] Workqueue: netns cleanup_net [ 69.010916][ T70] Call Trace: [ 69.011023][ T70] [ 69.011096][ T70] dump_stack_lvl (lib/dump_stack.c:117) [ 69.011325][ T70] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 69.011461][ T70] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 69.011633][ T70] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 69.011767][ T70] ? __bfs (kernel/locking/lockdep.c:1787) [ 69.011942][ T70] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 69.012087][ T70] check_irq_usage (kernel/locking/lockdep.c:2871) [ 69.012218][ T70] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 69.012357][ T70] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 69.012494][ T70] ? __bfs (kernel/locking/lockdep.c:1787) [ 69.012603][ T70] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 69.012737][ T70] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 69.012871][ T70] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 69.013004][ T70] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 69.013142][ T70] ? find_held_lock (kernel/locking/lockdep.c:5244) [ 69.013282][ T70] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 69.013419][ T70] check_prev_add (kernel/locking/lockdep.c:3138) [ 69.013554][ T70] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 69.013690][ T70] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 69.013819][ T70] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 69.013921][ T70] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 69.014052][ T70] ? 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) [ 69.014189][ T70] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 69.014285][ T70] __lock_acquire (kernel/locking/lockdep.c:5137) [ 69.014427][ T70] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 69.014564][ T70] ? __get_task_comm (fs/exec.c:1234) [ 69.014709][ T70] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 69.014812][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 69.014941][ T70] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 69.015076][ T70] ? __get_task_comm (fs/exec.c:1234) [ 69.015209][ T70] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 69.015345][ T70] ? __get_task_comm (fs/exec.c:1234) [ 69.015476][ T70] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 69.015616][ T70] ? __get_task_comm (fs/exec.c:1234) [ 69.015752][ T70] __get_task_comm (fs/exec.c:1234) [ 69.015887][ T70] ref_tracker_alloc (lib/ref_tracker.c:217) [ 69.016027][ T70] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 69.016167][ T70] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 69.016303][ T70] ? rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) [ 69.016444][ T70] ? fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 69.016586][ T70] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 69.016729][ T70] ? unregister_netdevice_many_notify (net/core/dev.c:11171) [ 69.016895][ T70] ? default_device_exit_batch (net/core/dev.c:11707) [ 69.017059][ T70] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 69.017195][ T70] ? process_one_work (kernel/workqueue.c:3254) [ 69.017326][ T70] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 69.017464][ T70] ? kthread (kernel/kthread.c:388) [ 69.017564][ T70] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 69.017700][ T70] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 69.017837][ T70] ? 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) [ 69.017972][ T70] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) [ 69.018102][ T70] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 69.018235][ T70] ? rt_flush_dev (net/ipv4/route.c:1551) [ 69.018372][ T70] rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) [ 69.018505][ T70] ? __timer_delete_sync (kernel/time/timer.c:1648 (discriminator 1)) [ 69.018642][ T70] ? __timer_delete_sync (kernel/time/timer.c:1668 (discriminator 34)) [ 69.018777][ T70] fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 69.018911][ T70] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 69.019045][ T70] unregister_netdevice_many_notify (net/core/dev.c:11171) [ 69.019211][ T70] ? 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) [ 69.019345][ T70] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 69.019511][ T70] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 69.019679][ T70] default_device_exit_batch (net/core/dev.c:11707) [ 69.019810][ T70] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 69.019985][ T70] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 69.020121][ T70] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 69.020253][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 69.020389][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 69.020525][ T70] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 69.020660][ T70] ? process_one_work (kernel/workqueue.c:3230) [ 69.020794][ T70] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 69.020925][ T70] ? process_one_work (kernel/workqueue.c:3230) [ 69.021064][ T70] process_one_work (kernel/workqueue.c:3254) [ 69.021205][ T70] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 69.021340][ T70] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 69.021474][ T70] ? assign_work (kernel/workqueue.c:1209) [ 69.021608][ T70] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 69.021746][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 69.021909][ T70] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 69.022042][ T70] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 69.022170][ T70] kthread (kernel/kthread.c:388) [ 69.022273][ T70] ? __pfx_kthread (kernel/kthread.c:341) [ 69.022405][ T70] ret_from_fork (arch/x86/kernel/process.c:147) [ 69.022537][ T70] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage