====================================== | [ 1000.656007][ T10] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 1000.656151][ T10] | [ 1000.656234][ T10] | [ 1000.656234][ T10] stack backtrace: [ 1000.656735][ T10] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 1000.657047][ T10] Workqueue: netns cleanup_net [ 1000.657271][ T10] Call Trace: [ 1000.657375][ T10] [ 1000.657451][ T10] dump_stack_lvl (lib/dump_stack.c:117) [ 1000.657601][ T10] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 1000.657744][ T10] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 1000.658000][ T10] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 1000.658140][ T10] ? __bfs (kernel/locking/lockdep.c:1787) [ 1000.658242][ T10] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 1000.658378][ T10] check_irq_usage (kernel/locking/lockdep.c:2871) [ 1000.658598][ T10] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 1000.658736][ T10] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 1000.658956][ T10] ? __bfs (kernel/locking/lockdep.c:1787) [ 1000.659065][ T10] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 1000.659202][ T10] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 1000.659421][ T10] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 1000.659554][ T10] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 1000.659694][ T10] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 1000.659827][ T10] check_prev_add (kernel/locking/lockdep.c:3138) [ 1000.660045][ T10] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 1000.660192][ T10] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 1000.660328][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 1000.660436][ T10] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 1000.660571][ 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) [ 1000.660788][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 1000.660895][ T10] __lock_acquire (kernel/locking/lockdep.c:5137) [ 1000.661034][ T10] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 1000.661171][ T10] ? __get_task_comm (fs/exec.c:1234) [ 1000.661311][ T10] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 1000.661412][ T10] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 1000.661555][ T10] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 1000.661694][ T10] ? __get_task_comm (fs/exec.c:1234) [ 1000.661827][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 1000.662047][ T10] ? __get_task_comm (fs/exec.c:1234) [ 1000.662185][ T10] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 1000.662323][ T10] ? __get_task_comm (fs/exec.c:1234) [ 1000.662457][ T10] __get_task_comm (fs/exec.c:1234) [ 1000.662591][ T10] ref_tracker_alloc (lib/ref_tracker.c:217) [ 1000.662738][ T10] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 1000.662958][ T10] ? __lock_release (kernel/locking/lockdep.c:5430) [ 1000.663092][ T10] ? rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 1000.663265][ T10] ? rt6_disable_ip (net/ipv6/route.c:4910) [ 1000.663399][ T10] ? addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 1000.663539][ T10] ? addrconf_notify (net/ipv6/addrconf.c:3811) [ 1000.663674][ T10] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 1000.663885][ T10] ? unregister_netdevice_many_notify (net/core/dev.c:11171) [ 1000.664143][ T10] ? default_device_exit_batch (net/core/dev.c:11707) [ 1000.664323][ T10] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 1000.664459][ T10] ? process_one_work (kernel/workqueue.c:3254) [ 1000.664653][ T10] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 1000.664905][ T10] ? kthread (kernel/kthread.c:388) [ 1000.665007][ T10] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 1000.665150][ T10] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 1000.665400][ T10] ? in6_dev_get (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/addrconf.h:373) [ 1000.665576][ T10] rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 1000.665794][ T10] rt6_disable_ip (net/ipv6/route.c:4910) [ 1000.665956][ T10] ? __pfx_rt6_disable_ip (net/ipv6/route.c:4907) [ 1000.666122][ 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) [ 1000.666260][ T10] addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 1000.666414][ T10] ? __try_to_del_timer_sync (kernel/time/timer.c:1500) [ 1000.666659][ T10] ? __pfx_addrconf_ifdown.isra.0 (net/ipv6/addrconf.c:3841) [ 1000.666837][ T10] addrconf_notify (net/ipv6/addrconf.c:3811) [ 1000.666987][ T10] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 1000.667133][ T10] unregister_netdevice_many_notify (net/core/dev.c:11171) [ 1000.667321][ 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) [ 1000.667542][ T10] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 1000.667821][ T10] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 1000.667995][ T10] default_device_exit_batch (net/core/dev.c:11707) [ 1000.668150][ T10] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 1000.668340][ T10] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 1000.668530][ T10] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 1000.668689][ T10] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 1000.668850][ T10] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 1000.669200][ T10] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 1000.669356][ T10] ? process_one_work (kernel/workqueue.c:3230) [ 1000.669509][ T10] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 1000.669663][ T10] ? process_one_work (kernel/workqueue.c:3230) [ 1000.669803][ T10] process_one_work (kernel/workqueue.c:3254) [ 1000.669967][ T10] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 1000.670105][ T10] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 1000.670332][ T10] ? assign_work (kernel/workqueue.c:1209) [ 1000.670489][ T10] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 1000.670646][ T10] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 1000.670811][ T10] kthread (kernel/kthread.c:388) [ 1000.670929][ T10] ? __pfx_kthread (kernel/kthread.c:341) [ 1000.671066][ T10] ret_from_fork (arch/x86/kernel/process.c:147) [ 1000.671300][ T10] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage