====================================== | [ 139.764288][ T10] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 139.764418][ T10] | [ 139.764559][ T10] | [ 139.764559][ T10] stack backtrace: [ 139.764920][ T10] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 139.765284][ T10] Workqueue: netns cleanup_net [ 139.765421][ T10] Call Trace: [ 139.765534][ T10] [ 139.765605][ T10] dump_stack_lvl (lib/dump_stack.c:117) [ 139.765826][ T10] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 139.765961][ T10] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 139.766131][ T10] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 139.766268][ T10] ? __bfs (kernel/locking/lockdep.c:1787) [ 139.766369][ T10] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 139.766571][ T10] check_irq_usage (kernel/locking/lockdep.c:2871) [ 139.766705][ T10] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 139.766846][ T10] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 139.766975][ T10] ? __bfs (kernel/locking/lockdep.c:1787) [ 139.767146][ T10] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 139.767277][ T10] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 139.767409][ T10] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 139.767540][ T10] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 139.767747][ T10] ? find_held_lock (kernel/locking/lockdep.c:5244) [ 139.767890][ T10] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 139.768022][ T10] check_prev_add (kernel/locking/lockdep.c:3138) [ 139.768153][ T10] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 139.768287][ T10] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 139.768496][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 139.768595][ T10] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 139.768730][ T10] ? 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) [ 139.768871][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 139.769046][ T10] __lock_acquire (kernel/locking/lockdep.c:5137) [ 139.769181][ T10] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 139.769309][ T10] ? __get_task_comm (fs/exec.c:1234) [ 139.769444][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 139.769547][ T10] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 139.769747][ T10] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 139.769889][ T10] ? __get_task_comm (fs/exec.c:1234) [ 139.770019][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 139.770149][ T10] ? __get_task_comm (fs/exec.c:1234) [ 139.770355][ T10] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 139.770487][ T10] ? __get_task_comm (fs/exec.c:1234) [ 139.770615][ T10] __get_task_comm (fs/exec.c:1234) [ 139.770744][ T10] ref_tracker_alloc (lib/ref_tracker.c:217) [ 139.770974][ T10] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 139.771104][ T10] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 139.771239][ T10] ? rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) [ 139.771369][ T10] ? fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 139.771505][ T10] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 139.771711][ T10] ? unregister_netdevice_many_notify (net/core/dev.c:11171) [ 139.771889][ T10] ? default_device_exit_batch (net/core/dev.c:11707) [ 139.772050][ T10] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 139.772257][ T10] ? process_one_work (kernel/workqueue.c:3254) [ 139.772389][ T10] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 139.772523][ T10] ? kthread (kernel/kthread.c:388) [ 139.772622][ T10] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 139.772752][ T10] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 139.772957][ T10] ? 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) [ 139.773088][ T10] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) [ 139.773217][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 139.773349][ T10] ? rt_flush_dev (net/ipv4/route.c:1551) [ 139.773553][ T10] rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) [ 139.773686][ T10] ? __timer_delete_sync (kernel/time/timer.c:1648 (discriminator 1)) [ 139.773822][ T10] ? __timer_delete_sync (kernel/time/timer.c:1668 (discriminator 34)) [ 139.773954][ T10] fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 139.774163][ T10] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 139.774297][ T10] unregister_netdevice_many_notify (net/core/dev.c:11171) [ 139.774461][ T10] ? 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) [ 139.774593][ T10] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 139.774838][ T10] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 139.775015][ T10] default_device_exit_batch (net/core/dev.c:11707) [ 139.775144][ T10] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 139.775313][ T10] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 139.775443][ T10] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 139.775570][ T10] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 139.775698][ T10] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 139.775824][ T10] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 139.776023][ T10] ? process_one_work (kernel/workqueue.c:3230) [ 139.776158][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 139.776285][ T10] ? process_one_work (kernel/workqueue.c:3230) [ 139.776413][ T10] process_one_work (kernel/workqueue.c:3254) [ 139.776616][ T10] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 139.776744][ T10] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 139.776872][ T10] ? assign_work (kernel/workqueue.c:1209) [ 139.777002][ T10] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 139.777131][ T10] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 139.777335][ T10] kthread (kernel/kthread.c:388) [ 139.777431][ T10] ? __pfx_kthread (kernel/kthread.c:341) [ 139.777558][ T10] ret_from_fork (arch/x86/kernel/process.c:147) [ 139.777685][ T10] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage