====================================== | [ 135.620958][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 135.621093][ T70] | [ 135.621158][ T70] | [ 135.621158][ T70] stack backtrace: [ 135.621587][ T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 135.621955][ T70] Workqueue: netns cleanup_net [ 135.622092][ T70] Call Trace: [ 135.622199][ T70] [ 135.622268][ T70] dump_stack_lvl (lib/dump_stack.c:117) [ 135.622488][ T70] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 135.622621][ T70] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 135.622791][ T70] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 135.622923][ T70] ? __bfs (kernel/locking/lockdep.c:1787) [ 135.623025][ T70] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 135.623157][ T70] check_irq_usage (kernel/locking/lockdep.c:2871) [ 135.623362][ T70] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 135.623497][ T70] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 135.623628][ T70] ? __bfs (kernel/locking/lockdep.c:1787) [ 135.623726][ T70] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 135.623935][ T70] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 135.624068][ T70] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 135.624203][ T70] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 135.624334][ T70] ? find_held_lock (kernel/locking/lockdep.c:5244) [ 135.624544][ T70] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 135.624683][ T70] check_prev_add (kernel/locking/lockdep.c:3138) [ 135.624816][ T70] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 135.624947][ T70] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 135.625079][ T70] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 135.625256][ T70] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 135.625385][ 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) [ 135.625513][ T70] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 135.625613][ T70] __lock_acquire (kernel/locking/lockdep.c:5137) [ 135.625819][ T70] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 135.625949][ T70] ? __get_task_comm (fs/exec.c:1234) [ 135.626080][ T70] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 135.626181][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 135.626315][ T70] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 135.626528][ T70] ? __get_task_comm (fs/exec.c:1234) [ 135.626657][ T70] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 135.626786][ T70] ? __get_task_comm (fs/exec.c:1234) [ 135.626909][ T70] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 135.627040][ T70] ? __get_task_comm (fs/exec.c:1234) [ 135.627169][ T70] __get_task_comm (fs/exec.c:1234) [ 135.627372][ T70] ref_tracker_alloc (lib/ref_tracker.c:217) [ 135.627506][ T70] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 135.627638][ T70] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 135.627765][ T70] ? rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) [ 135.627897][ T70] ? fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 135.628032][ T70] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 135.628232][ T70] ? unregister_netdevice_many_notify (net/core/dev.c:11171) [ 135.628475][ T70] ? default_device_exit_batch (net/core/dev.c:11707) [ 135.628637][ T70] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 135.628766][ T70] ? process_one_work (kernel/workqueue.c:3254) [ 135.628967][ T70] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 135.629094][ T70] ? kthread (kernel/kthread.c:388) [ 135.629194][ T70] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 135.629323][ T70] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 135.629455][ 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) [ 135.629584][ T70] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) [ 135.629716][ T70] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 135.629925][ T70] ? rt_flush_dev (net/ipv4/route.c:1551) [ 135.630064][ T70] rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) [ 135.630194][ T70] ? __timer_delete_sync (kernel/time/timer.c:1648 (discriminator 1)) [ 135.630328][ T70] ? __timer_delete_sync (kernel/time/timer.c:1668 (discriminator 34)) [ 135.630456][ T70] fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 135.630584][ T70] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 135.630787][ T70] unregister_netdevice_many_notify (net/core/dev.c:11171) [ 135.630956][ 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) [ 135.631089][ T70] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 135.631248][ T70] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 135.631549][ T70] default_device_exit_batch (net/core/dev.c:11707) [ 135.631677][ T70] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 135.631838][ T70] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 135.631970][ T70] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 135.632172][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 135.632304][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 135.632432][ T70] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 135.632562][ T70] ? process_one_work (kernel/workqueue.c:3230) [ 135.632765][ T70] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 135.632893][ T70] ? process_one_work (kernel/workqueue.c:3230) [ 135.633025][ T70] process_one_work (kernel/workqueue.c:3254) [ 135.633154][ T70] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 135.633353][ T70] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 135.633484][ T70] ? assign_work (kernel/workqueue.c:1209) [ 135.633612][ T70] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 135.633741][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 135.633974][ T70] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 135.634111][ T70] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 135.634240][ T70] kthread (kernel/kthread.c:388) [ 135.634340][ T70] ? __pfx_kthread (kernel/kthread.c:341) [ 135.634470][ T70] ret_from_fork (arch/x86/kernel/process.c:147) [ 135.634599][ T70] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage