====================================== | [ 135.719841][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 135.720052][ T70] | [ 135.720124][ T70] | [ 135.720124][ T70] stack backtrace: [ 135.720512][ T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 135.720904][ T70] Workqueue: netns cleanup_net [ 135.721048][ T70] Call Trace: [ 135.721160][ T70] [ 135.721233][ T70] dump_stack_lvl (lib/dump_stack.c:117) [ 135.721378][ T70] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 135.721518][ T70] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 135.721693][ T70] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 135.721834][ T70] ? __bfs (kernel/locking/lockdep.c:1787) [ 135.721943][ T70] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 135.722088][ T70] check_irq_usage (kernel/locking/lockdep.c:2871) [ 135.722227][ T70] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 135.722369][ T70] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 135.722510][ T70] ? __bfs (kernel/locking/lockdep.c:1787) [ 135.722683][ T70] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 135.722810][ T70] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 135.722939][ T70] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 135.723069][ T70] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 135.723265][ T70] ? find_held_lock (kernel/locking/lockdep.c:5244) [ 135.723393][ T70] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 135.723518][ T70] check_prev_add (kernel/locking/lockdep.c:3138) [ 135.723644][ T70] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 135.723841][ T70] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 135.723970][ T70] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 135.724065][ T70] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 135.724192][ 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) [ 135.724322][ T70] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 135.724490][ T70] __lock_acquire (kernel/locking/lockdep.c:5137) [ 135.724619][ T70] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 135.724748][ T70] ? __get_task_comm (fs/exec.c:1234) [ 135.724873][ T70] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 135.724970][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 135.725166][ T70] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 135.725292][ T70] ? __get_task_comm (fs/exec.c:1234) [ 135.725421][ T70] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 135.725546][ T70] ? __get_task_comm (fs/exec.c:1234) [ 135.725744][ T70] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 135.725870][ T70] ? __get_task_comm (fs/exec.c:1234) [ 135.725995][ T70] __get_task_comm (fs/exec.c:1234) [ 135.726121][ T70] ref_tracker_alloc (lib/ref_tracker.c:217) [ 135.726320][ T70] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 135.726446][ T70] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 135.726573][ T70] ? rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) [ 135.726701][ T70] ? fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 135.726965][ T70] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 135.727090][ T70] ? unregister_netdevice_many_notify (net/core/dev.c:11171) [ 135.727245][ T70] ? default_device_exit_batch (net/core/dev.c:11707) [ 135.727400][ T70] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 135.727607][ T70] ? process_one_work (kernel/workqueue.c:3254) [ 135.727733][ T70] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 135.727858][ T70] ? kthread (kernel/kthread.c:388) [ 135.727956][ T70] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 135.728081][ T70] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 135.728277][ 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) [ 135.728405][ T70] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) [ 135.728531][ T70] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 135.728656][ T70] ? rt_flush_dev (net/ipv4/route.c:1551) [ 135.728862][ T70] rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) [ 135.728988][ T70] ? __timer_delete_sync (kernel/time/timer.c:1648 (discriminator 1)) [ 135.729117][ T70] ? __timer_delete_sync (kernel/time/timer.c:1668 (discriminator 34)) [ 135.729244][ T70] fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 135.729373][ T70] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 135.729500][ T70] unregister_netdevice_many_notify (net/core/dev.c:11171) [ 135.729656][ 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) [ 135.729783][ T70] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 135.729939][ T70] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 135.730099][ T70] default_device_exit_batch (net/core/dev.c:11707) [ 135.730236][ T70] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 135.730392][ T70] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 135.730593][ T70] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 135.730718][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 135.730845][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 135.730971][ T70] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 135.731168][ T70] ? process_one_work (kernel/workqueue.c:3230) [ 135.731294][ T70] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 135.731421][ T70] ? process_one_work (kernel/workqueue.c:3230) [ 135.731549][ T70] process_one_work (kernel/workqueue.c:3254) [ 135.731753][ T70] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 135.731881][ T70] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 135.732009][ T70] ? assign_work (kernel/workqueue.c:1209) [ 135.732135][ T70] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 135.732261][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 135.732421][ T70] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 135.732547][ T70] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 135.732677][ T70] kthread (kernel/kthread.c:388) [ 135.732774][ T70] ? __pfx_kthread (kernel/kthread.c:341) [ 135.732900][ T70] ret_from_fork (arch/x86/kernel/process.c:147) [ 135.733026][ T70] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage