====================================== | [ 148.618202][ T72] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 148.618328][ T72] | [ 148.618393][ T72] | [ 148.618393][ T72] stack backtrace: [ 148.618809][ T72] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 148.619088][ T72] Workqueue: netns cleanup_net [ 148.619293][ T72] Call Trace: [ 148.619404][ T72] [ 148.619471][ T72] dump_stack_lvl (lib/dump_stack.c:117) [ 148.619602][ T72] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 148.619731][ T72] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 148.619969][ T72] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 148.620095][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 148.620191][ T72] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 148.620319][ T72] check_irq_usage (kernel/locking/lockdep.c:2871) [ 148.620448][ T72] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 148.620576][ T72] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 148.620704][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 148.620800][ T72] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 148.620927][ T72] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 148.621064][ T72] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 148.621192][ T72] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 148.621319][ T72] ? find_held_lock (kernel/locking/lockdep.c:5244) [ 148.621448][ T72] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 148.621648][ T72] check_prev_add (kernel/locking/lockdep.c:3138) [ 148.621775][ T72] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 148.621902][ T72] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 148.622039][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 148.622138][ T72] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 148.622337][ T72] ? 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) [ 148.622477][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 148.622574][ T72] __lock_acquire (kernel/locking/lockdep.c:5137) [ 148.622705][ T72] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 148.622907][ T72] ? __get_task_comm (fs/exec.c:1234) [ 148.623036][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 148.623132][ T72] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 148.623268][ T72] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 148.623399][ T72] ? __get_task_comm (fs/exec.c:1234) [ 148.623525][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 148.623651][ T72] ? __get_task_comm (fs/exec.c:1234) [ 148.623778][ T72] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 148.623904][ T72] ? __get_task_comm (fs/exec.c:1234) [ 148.624031][ T72] __get_task_comm (fs/exec.c:1234) [ 148.624157][ T72] ref_tracker_alloc (lib/ref_tracker.c:217) [ 148.624283][ T72] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 148.624409][ T72] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 148.624608][ T72] ? rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) [ 148.624735][ T72] ? fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 148.624860][ T72] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 148.624993][ T72] ? unregister_netdevice_many_notify (net/core/dev.c:11171) [ 148.625219][ T72] ? default_device_exit_batch (net/core/dev.c:11707) [ 148.625375][ T72] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 148.625500][ T72] ? process_one_work (kernel/workqueue.c:3254) [ 148.625642][ T72] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 148.625912][ T72] ? kthread (kernel/kthread.c:388) [ 148.626008][ T72] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 148.626137][ T72] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 148.626264][ T72] ? 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) [ 148.626394][ T72] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) [ 148.626519][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 148.626649][ T72] ? rt_flush_dev (net/ipv4/route.c:1551) [ 148.626776][ T72] rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) [ 148.626913][ T72] ? __timer_delete_sync (kernel/time/timer.c:1648 (discriminator 1)) [ 148.627041][ T72] ? __timer_delete_sync (kernel/time/timer.c:1668 (discriminator 34)) [ 148.627170][ T72] fib_netdev_event (net/ipv4/fib_frontend.c:1520) [ 148.627295][ T72] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 148.627423][ T72] unregister_netdevice_many_notify (net/core/dev.c:11171) [ 148.627650][ T72] ? 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) [ 148.627781][ T72] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 148.627938][ T72] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 148.628100][ T72] default_device_exit_batch (net/core/dev.c:11707) [ 148.628304][ T72] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 148.628461][ T72] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 148.628588][ T72] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 148.628714][ T72] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 148.628913][ T72] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 148.629045][ T72] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 148.629174][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 148.629308][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 148.629521][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 148.629648][ T72] process_one_work (kernel/workqueue.c:3254) [ 148.629776][ T72] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 148.629904][ T72] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 148.630107][ T72] ? assign_work (kernel/workqueue.c:1209) [ 148.630234][ T72] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 148.630371][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 148.630497][ T72] kthread (kernel/kthread.c:388) [ 148.630592][ T72] ? __pfx_kthread (kernel/kthread.c:341) [ 148.630790][ T72] ret_from_fork (arch/x86/kernel/process.c:147) [ 148.630916][ T72] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage