====================================== | [ 222.411520][ T74] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 222.411658][ T74] | [ 222.411724][ T74] | [ 222.411724][ T74] stack backtrace: [ 222.412163][ T74] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 222.412548][ T74] Workqueue: netns cleanup_net [ 222.412690][ T74] Call Trace: [ 222.412803][ T74] [ 222.412876][ T74] dump_stack_lvl (lib/dump_stack.c:117) [ 222.413014][ T74] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 222.413175][ T74] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 222.413345][ T74] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 222.413601][ T74] ? __bfs (kernel/locking/lockdep.c:1787) [ 222.413714][ T74] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 222.413850][ T74] check_irq_usage (kernel/locking/lockdep.c:2871) [ 222.413989][ T74] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 222.414240][ T74] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 222.414388][ T74] ? __bfs (kernel/locking/lockdep.c:1787) [ 222.414531][ T74] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 222.414666][ T74] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 222.414800][ T74] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 222.414930][ T74] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 222.415068][ T74] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 222.415199][ T74] check_prev_add (kernel/locking/lockdep.c:3138) [ 222.415335][ T74] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 222.415472][ T74] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 222.415607][ T74] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 222.415784][ T74] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 222.415928][ T74] ? 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) [ 222.416143][ T74] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 222.416249][ T74] __lock_acquire (kernel/locking/lockdep.c:5137) [ 222.416406][ T74] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 222.416630][ T74] ? __get_task_comm (fs/exec.c:1234) [ 222.416777][ T74] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 222.416879][ T74] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 222.417115][ T74] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 222.417249][ T74] ? __get_task_comm (fs/exec.c:1234) [ 222.417385][ T74] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 222.417552][ T74] ? __get_task_comm (fs/exec.c:1234) [ 222.417692][ T74] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 222.417926][ T74] ? __get_task_comm (fs/exec.c:1234) [ 222.418071][ T74] __get_task_comm (fs/exec.c:1234) [ 222.418208][ T74] ref_tracker_alloc (lib/ref_tracker.c:217) [ 222.418342][ T74] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 222.418502][ T74] ? __lock_release (kernel/locking/lockdep.c:5430) [ 222.418724][ T74] ? rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 222.418906][ T74] ? rt6_disable_ip (net/ipv6/route.c:4910) [ 222.419041][ T74] ? addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 222.419190][ T74] ? addrconf_notify (net/ipv6/addrconf.c:3811) [ 222.419487][ T74] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 222.419636][ T74] ? dev_close_many (net/core/dev.c:1571) [ 222.419772][ T74] ? unregister_netdevice_many_notify (net/core/dev.c:11146) [ 222.420054][ T74] ? default_device_exit_batch (net/core/dev.c:11707) [ 222.420231][ T74] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 222.420383][ T74] ? process_one_work (kernel/workqueue.c:3254) [ 222.420615][ T74] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 222.420768][ T74] ? kthread (kernel/kthread.c:388) [ 222.420874][ T74] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 222.421019][ T74] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 222.421173][ T74] ? in6_dev_get (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/addrconf.h:373) [ 222.421312][ T74] rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 222.421608][ T74] rt6_disable_ip (net/ipv6/route.c:4910) [ 222.421765][ T74] ? __pfx_rt6_disable_ip (net/ipv6/route.c:4907) [ 222.421903][ T74] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 222.422005][ T74] addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 222.422156][ T74] ? __try_to_del_timer_sync (kernel/time/timer.c:1500) [ 222.422391][ T74] ? __pfx_addrconf_ifdown.isra.0 (net/ipv6/addrconf.c:3841) [ 222.422595][ T74] addrconf_notify (net/ipv6/addrconf.c:3811) [ 222.422733][ T74] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 222.422893][ T74] dev_close_many (net/core/dev.c:1571) [ 222.423032][ T74] ? __pfx_dev_close_many (net/core/dev.c:1558) [ 222.423166][ T74] ? default_device_exit_batch (net/core/dev.c:11693) [ 222.423319][ T74] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 52)) [ 222.423468][ T74] unregister_netdevice_many_notify (net/core/dev.c:11146) [ 222.423746][ T74] ? 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) [ 222.423897][ T74] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 222.424067][ T74] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 222.424340][ T74] default_device_exit_batch (net/core/dev.c:11707) [ 222.424486][ T74] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 222.424680][ T74] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 222.424817][ T74] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 222.425061][ T74] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 222.425214][ T74] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 222.425350][ T74] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 222.425523][ T74] ? process_one_work (kernel/workqueue.c:3230) [ 222.425739][ T74] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 222.425952][ T74] ? process_one_work (kernel/workqueue.c:3230) [ 222.426101][ T74] process_one_work (kernel/workqueue.c:3254) [ 222.426235][ T74] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 222.426385][ T74] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 222.426631][ T74] ? assign_work (kernel/workqueue.c:1209) [ 222.426860][ T74] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 222.427073][ T74] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 222.427251][ T74] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 222.427385][ T74] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 222.427571][ T74] kthread (kernel/kthread.c:388) [ 222.427695][ T74] ? __pfx_kthread (kernel/kthread.c:341) [ 222.427832][ T74] ret_from_fork (arch/x86/kernel/process.c:147) [ 222.428040][ T74] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage