====================================== | [ 25.617434][ T72] ret_from_fork_asm (arch/x86/entry/entry_64.S:256) | [ 25.617570][ T72] | [ 25.617639][ T72] | [ 25.617639][ T72] stack backtrace: [ 25.618166][ T72] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 25.618471][ T72] Workqueue: netns cleanup_net [ 25.618699][ T72] Call Trace: [ 25.618808][ T72] [ 25.618880][ T72] dump_stack_lvl (lib/dump_stack.c:117) [ 25.619020][ T72] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) [ 25.619159][ T72] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) [ 25.619331][ T72] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) [ 25.619472][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 25.619574][ T72] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) [ 25.619711][ T72] check_irq_usage (kernel/locking/lockdep.c:2871) [ 25.619937][ T72] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) [ 25.620076][ T72] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) [ 25.620220][ T72] ? __bfs (kernel/locking/lockdep.c:1787) [ 25.620326][ T72] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) [ 25.620467][ T72] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) [ 25.620683][ T72] ? check_noncircular (kernel/locking/lockdep.c:2172) [ 25.620820][ T72] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) [ 25.620959][ T72] ? check_prev_add (kernel/locking/lockdep.c:3138) [ 25.621096][ T72] check_prev_add (kernel/locking/lockdep.c:3138) [ 25.621308][ T72] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) [ 25.621446][ T72] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) [ 25.621586][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 25.621690][ T72] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) [ 25.621906][ 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) [ 25.622039][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 25.622143][ T72] __lock_acquire (kernel/locking/lockdep.c:5137) [ 25.622279][ T72] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 25.622415][ T72] ? __get_task_comm (fs/exec.c:1234) [ 25.622640][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 25.622742][ T72] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 25.622879][ T72] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 25.623017][ T72] ? __get_task_comm (fs/exec.c:1234) [ 25.623153][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 25.623290][ T72] ? __get_task_comm (fs/exec.c:1234) [ 25.623429][ T72] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 25.623573][ T72] ? __get_task_comm (fs/exec.c:1234) [ 25.623711][ T72] __get_task_comm (fs/exec.c:1234) [ 25.623936][ T72] ref_tracker_alloc (lib/ref_tracker.c:217) [ 25.624083][ T72] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) [ 25.624220][ T72] ? __lock_release (kernel/locking/lockdep.c:5430) [ 25.624358][ T72] ? rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 25.624535][ T72] ? rt6_disable_ip (net/ipv6/route.c:4910) [ 25.624757][ T72] ? addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 25.624895][ T72] ? addrconf_notify (net/ipv6/addrconf.c:3811) [ 25.625037][ T72] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 25.625174][ T72] ? dev_close_many (net/core/dev.c:1571) [ 25.625310][ T72] ? unregister_netdevice_many_notify (net/core/dev.c:11146) [ 25.625558][ T72] ? default_device_exit_batch (net/core/dev.c:11707) [ 25.625731][ T72] ? cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 25.625860][ T72] ? process_one_work (kernel/workqueue.c:3254) [ 25.626076][ T72] ? worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 25.626214][ T72] ? kthread (kernel/kthread.c:388) [ 25.626319][ T72] ? ret_from_fork (arch/x86/kernel/process.c:147) [ 25.626558][ T72] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:256) [ 25.626697][ T72] ? in6_dev_get (./include/linux/rcupdate.h:339 ./include/linux/rcupdate.h:814 ./include/net/addrconf.h:373) [ 25.626831][ T72] rt6_uncached_list_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv6/route.c:185) [ 25.627006][ T72] rt6_disable_ip (net/ipv6/route.c:4910) [ 25.627152][ T72] ? __pfx_rt6_disable_ip (net/ipv6/route.c:4907) [ 25.627288][ T72] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) [ 25.627391][ T72] addrconf_ifdown.isra.0 (./include/net/addrconf.h:324 net/ipv6/addrconf.c:3856) [ 25.627534][ T72] ? __try_to_del_timer_sync (kernel/time/timer.c:1500) [ 25.627679][ T72] ? __pfx_addrconf_ifdown.isra.0 (net/ipv6/addrconf.c:3841) [ 25.627928][ T72] addrconf_notify (net/ipv6/addrconf.c:3811) [ 25.628067][ T72] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) [ 25.628204][ T72] dev_close_many (net/core/dev.c:1571) [ 25.628345][ T72] ? __pfx_dev_close_many (net/core/dev.c:1558) [ 25.628567][ T72] ? default_device_exit_batch (net/core/dev.c:11693) [ 25.628703][ T72] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 52)) [ 25.628840][ T72] unregister_netdevice_many_notify (net/core/dev.c:11146) [ 25.629018][ 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) [ 25.629157][ T72] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) [ 25.629327][ T72] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) [ 25.629498][ T72] default_device_exit_batch (net/core/dev.c:11707) [ 25.629639][ T72] ? __pfx_default_device_exit_batch (net/core/dev.c:11682) [ 25.629897][ T72] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) [ 25.630034][ T72] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) [ 25.630183][ T72] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 25.630430][ T72] ? __pfx_cleanup_net (net/core/net_namespace.c:581) [ 25.630565][ T72] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 25.630703][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 25.630845][ T72] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 25.630985][ T72] ? process_one_work (kernel/workqueue.c:3230) [ 25.631195][ T72] process_one_work (kernel/workqueue.c:3254) [ 25.631342][ T72] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) [ 25.631483][ T72] ? __pfx_process_one_work (kernel/workqueue.c:3156) [ 25.631634][ T72] ? assign_work (kernel/workqueue.c:1209) [ 25.631847][ T72] worker_thread (kernel/workqueue.c:3329 kernel/workqueue.c:3416) [ 25.631984][ T72] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) [ 25.632150][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 25.632287][ T72] ? __pfx_worker_thread (kernel/workqueue.c:3362) [ 25.632507][ T72] kthread (kernel/kthread.c:388) [ 25.632610][ T72] ? __pfx_kthread (kernel/kthread.c:341) [ 25.632749][ T72] ret_from_fork (arch/x86/kernel/process.c:147) [ 25.632885][ T72] ? __pfx_kthread (kernel/kthread.c:341) Finger prints: ret_from_fork_asm:dump_stack_lvl:print_bad_irq_dependency:check_irq_usage