[   29.900052][  T204] sh (204) used greatest stack depth: 24640 bytes left
[   36.118729][  T260] ip (260) used greatest stack depth: 24064 bytes left
[   50.258095][    C1] BUG: spinlock bad magic on CPU#1, kworker/u16:1/73
[   50.258413][    C1]  lock: noop_qdisc+0x240/0x300, .magic: 00000000, .owner: kworker/u16:1/73, .owner_cpu: 1
[   50.258801][    C1] CPU: 1 UID: 0 PID: 73 Comm: kworker/u16:1 Not tainted 6.10.0-virtme #1
[   50.259045][    C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   50.259462][    C1] Workqueue: netns cleanup_net
[   50.259649][    C1] Call Trace:
[   50.259785][    C1]  <IRQ>
[   50.259875][    C1]  dump_stack_lvl+0xb0/0xd0
[   50.260024][    C1]  do_raw_spin_unlock+0x1ac/0x220
[   50.260178][    C1]  _raw_spin_unlock+0x23/0x40
[   50.260369][    C1]  net_tx_action+0x402/0x660
[   50.260518][    C1]  handle_softirqs+0x1f9/0x5c0
[   50.260687][    C1]  ? dev_deactivate_many+0x1e2/0x8d0
[   50.260864][    C1]  do_softirq+0x4d/0xa0
[   50.261000][    C1]  </IRQ>
[   50.261123][    C1]  <TASK>
[   50.261218][    C1]  __local_bh_enable_ip+0xf6/0x120
[   50.261386][    C1]  dev_deactivate_many+0x1e7/0x8d0
[   50.261595][    C1]  __dev_close_many+0x12b/0x2d0
[   50.261770][    C1]  ? __pfx___dev_close_many+0x10/0x10
[   50.261969][    C1]  dev_close_many+0x202/0x650
[   50.262132][    C1]  ? lock_acquire.part.0+0xeb/0x330
[   50.262682][    C1]  ? default_device_exit_batch+0x81/0x2d0
[   50.262838][    C1]  ? __pfx_dev_close_many+0x10/0x10
[   50.263003][    C1]  ? __mutex_trylock_common+0xfa/0x260
[   50.263163][    C1]  unregister_netdevice_many_notify+0x8e5/0x1570
[   50.263348][    C1]  ? lock_acquire+0x32/0xc0
[   50.263506][    C1]  ? trace_contention_end+0xeb/0x150
[   50.263657][    C1]  ? __mutex_lock+0x170/0xac0
[   50.263807][    C1]  ? __pfx_unregister_netdevice_many_notify+0x10/0x10
[   50.263996][    C1]  ? mark_lock+0x38/0x3e0
[   50.264121][    C1]  ? mutex_is_locked+0x17/0x50
[   50.264293][    C1]  ? rtnl_is_locked+0x15/0x20
[   50.264463][    C1]  ? unregister_netdevice_queue+0x70/0x410
[   50.264644][    C1]  ? __pfx_unregister_netdevice_queue+0x10/0x10
[   50.264827][    C1]  ? __pfx_unregister_netdevice_queue+0x10/0x10
[   50.265035][    C1]  default_device_exit_batch+0x234/0x2d0
[   50.265187][    C1]  ? __pfx_default_device_exit_batch+0x10/0x10
[   50.265367][    C1]  ? mutex_is_locked+0x17/0x50
[   50.265515][    C1]  ? nexthop_net_exit_batch_rtnl+0x83/0x210
[   50.265716][    C1]  cleanup_net+0x4ef/0x9d0
[   50.265870][    C1]  ? __pfx_lock_acquire.part.0+0x10/0x10
[   50.266009][    C1]  ? __pfx_cleanup_net+0x10/0x10
[   50.266149][    C1]  ? trace_lock_acquire+0x14d/0x1f0
[   50.266289][    C1]  ? process_one_work+0xdf1/0x1670
[   50.266475][    C1]  ? lock_acquire+0x32/0xc0
[   50.266670][    C1]  ? process_one_work+0xdf1/0x1670
[   50.266898][    C1]  process_one_work+0xe3b/0x1670
[   50.267146][    C1]  ? __pfx___lock_release+0x10/0x10
[   50.267363][    C1]  ? __pfx_process_one_work+0x10/0x10
[   50.267586][    C1]  ? assign_work+0x16c/0x240
[   50.267812][    C1]  worker_thread+0x587/0xce0
[   50.268028][    C1]  ? lockdep_hardirqs_on_prepare+0x275/0x410
[   50.268339][    C1]  ? __pfx_worker_thread+0x10/0x10
[   50.268533][    C1]  ? __pfx_worker_thread+0x10/0x10
[   50.268765][    C1]  kthread+0x28a/0x350
[   50.268934][    C1]  ? __pfx_kthread+0x10/0x10
[   50.269154][    C1]  ret_from_fork+0x31/0x70
[   50.269381][    C1]  ? __pfx_kthread+0x10/0x10
[   50.269599][    C1]  ret_from_fork_asm+0x1a/0x30
[   50.269829][    C1]  </TASK>
[  367.442174][ T2380] netem: version 1.3