====================================== | [ 135.730872][ T73] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 135.731005][ T73] | [ 135.731079][ T73] | [ 135.731079][ T73] stack backtrace: [ 135.731455][ T73] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 135.731792][ T73] Workqueue: netns cleanup_net [ 135.731926][ T73] Call Trace: [ 135.732038][ T73] [ 135.732108][ T73] dump_stack_lvl (lib/dump_stack.c:117) [ 135.732249][ T73] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 135.732464][ T73] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 135.732629][ T73] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 135.732764][ T73] ? __bfs (kernel/locking/lockdep.c:1787) [ 135.732871][ T73] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 135.733008][ T73] check_irq_usage (kernel/locking/lockdep.c:2871) [ 135.733142][ T73] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 135.733278][ T73] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 135.733493][ T73] ? __bfs (kernel/locking/lockdep.c:1787) [ 135.733594][ T73] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 135.733731][ T73] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 135.733872][ T73] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 135.734081][ T73] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 135.734214][ T73] ? find_held_lock (kernel/locking/lockdep.c:5244) [ 135.734347][ T73] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 135.734631][ T73] check_prev_add (kernel/locking/lockdep.c:3138) [ 135.734766][ T73] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 135.734898][ T73] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 135.735043][ T73] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 135.735147][ T73] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 135.735280][ T73] ? 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) [ 135.735486][ T73] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 135.735589][ T73] __lock_acquire (kernel/locking/lockdep.c:5137) [ 135.735725][ T73] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 135.735860][ T73] ? __get_task_comm (fs/exec.c:1234) [ 135.736078][ T73] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 135.736178][ T73] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 135.736394][ T73] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 135.736529][ T73] ? __get_task_comm (fs/exec.c:1234) [ 135.736663][ T73] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 135.736797][ T73] ? __get_task_comm (fs/exec.c:1234) [ 135.736934][ T73] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 135.737148][ T73] ? __get_task_comm (fs/exec.c:1234) [ 135.737283][ T73] __get_task_comm (fs/exec.c:1234) [ 135.737415][ T73] ref_tracker_alloc (lib/ref_tracker.c:217) [ 135.737551][ T73] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 135.737685][ T73] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 135.737817][ T73] ? rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) [ 135.738017][ T73] ? fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 135.738154][ T73] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 135.738291][ T73] ? unregister_netdevice_many_notify (net/core/dev.c:11171) [ 135.738454][ T73] ? default_device_exit_batch (net/core/dev.c:11707) [ 135.738693][ T73] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 135.738838][ T73] ? process_one_work (kernel/workqueue.c:3254) [ 135.738976][ T73] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 135.739112][ T73] ? kthread (kernel/kthread.c:388) [ 135.739213][ T73] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 135.739421][ T73] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 135.739557][ T73] ? 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) [ 135.739690][ T73] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) [ 135.739826][ T73] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 135.740034][ T73] ? rt_flush_dev (net/ipv4/route.c:1551) [ 135.740172][ T73] rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) [ 135.740306][ T73] ? __timer_delete_sync (kernel/time/timer.c:1648 (discriminator 1)) [ 135.740441][ T73] ? __timer_delete_sync (kernel/time/timer.c:1668 (discriminator 34)) [ 135.740658][ T73] fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 135.740794][ T73] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 135.740928][ T73] unregister_netdevice_many_notify (net/core/dev.c:11171) [ 135.741096][ T73] ? 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) [ 135.741304][ T73] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 135.741469][ T73] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 135.741632][ T73] default_device_exit_batch (net/core/dev.c:11707) [ 135.741762][ T73] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 135.741996][ T73] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 135.742129][ T73] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 135.742259][ T73] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 135.742388][ T73] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 135.742609][ T73] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 135.742737][ T73] ? process_one_work (kernel/workqueue.c:3230) [ 135.742866][ T73] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 135.743002][ T73] ? process_one_work (kernel/workqueue.c:3230) [ 135.743134][ T73] process_one_work (kernel/workqueue.c:3254) [ 135.743269][ T73] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 135.743399][ T73] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 135.743531][ T73] ? assign_work (kernel/workqueue.c:1209) [ 135.743669][ T73] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 135.743799][ T73] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 135.743963][ T73] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 135.744098][ T73] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 135.744228][ T73] kthread (kernel/kthread.c:388) [ 135.744326][ T73] ? __pfx_kthread (kernel/kthread.c:341) [ 135.744459][ T73] ret_from_fork (arch/x86/kernel/process.c:147) [ 135.744589][ T73] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage