INFO: task swctl:19657 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
swctl         D c0a419e4     0 19657      1 0x00000087
 ddc91000 00000080 00000001 c0a419e4 00000009 00000100 c04b9f75 00000000
 00000000 da03f740 0000149b 00000000 0000149b c0b25680 c0b25680 ddc912a8
 c0b25680 c0b21024 c0b25680 ddc912a8 ddcca000 ddc91000 fe80c723 fe80c740
Call Trace:
 [<c04b9f75>] ? rcu_process_callbacks+0x35/0x40
 [<c043c663>] ? mutex_spin_on_owner+0x73/0x90
 [<c083de18>] ? __mutex_lock_slowpath+0xd8/0x140
 [<c083dd1d>] ? mutex_lock+0x1d/0x40
 [<e16a9025>] ? sw_netdev_event+0x25/0x40 [switch]
 [<c0841d94>] ? notifier_call_chain+0x44/0x60
 [<c047c4e7>] ? raw_notifier_call_chain+0x17/0x20
 [<c0795ca7>] ? rollback_registered+0x67/0x110
 [<c0473dd0>] ? synchronize_sched+0x10/0x50
 [<c0795d66>] ? unregister_netdevice+0x16/0x60
 [<c083dd11>] ? mutex_lock+0x11/0x40
 [<c0795dbf>] ? unregister_netdev+0xf/0x20
 [<e16ad9c8>] ? __vif_delif+0x38/0x40 [switch]
 [<e16ada87>] ? sw_vif_delif+0x77/0x90 [switch]
 [<e16ad6e4>] ? sw_deviceless_ioctl+0xd64/0xf60 [switch]
 [<c05acd54>] ? avc_has_perm+0x64/0x80
 [<c05ae3d3>] ? inode_has_perm+0x63/0xc0
 [<c0457f30>] ? __wake_up_parent+0x20/0x30
 [<c046b670>] ? do_notify_parent_cldstop+0x100/0x130
 [<e16ae059>] ? sw_sock_ioctl+0x29/0x50 [switch]
 [<c0783f0f>] ? sock_ioctl+0x6f/0x260
 [<c0783ea0>] ? sock_ioctl+0x0/0x260
 [<c053d8ab>] ? vfs_ioctl+0x1b/0xa0
 [<c053da8c>] ? do_vfs_ioctl+0x6c/0x5c0
 [<c053e056>] ? sys_ioctl+0x76/0x90
 [<c083f074>] ? syscall_call+0x7/0xb
INFO: task swctl:19657 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
swctl         D c0a419e4     0 19657      1 0x00000087
 ddc91000 00000080 00000001 c0a419e4 00000009 00000100 c04b9f75 00000000
 00000000 da03f740 0000149b 00000000 0000149b c0b25680 c0b25680 ddc912a8
 c0b25680 c0b21024 c0b25680 ddc912a8 ddcca000 ddc91000 fe80c723 fe80c740
Call Trace:
 [<c04b9f75>] ? rcu_process_callbacks+0x35/0x40
 [<c043c663>] ? mutex_spin_on_owner+0x73/0x90
 [<c083de18>] ? __mutex_lock_slowpath+0xd8/0x140
 [<c083dd1d>] ? mutex_lock+0x1d/0x40
 [<e16a9025>] ? sw_netdev_event+0x25/0x40 [switch]
 [<c0841d94>] ? notifier_call_chain+0x44/0x60
 [<c047c4e7>] ? raw_notifier_call_chain+0x17/0x20
 [<c0795ca7>] ? rollback_registered+0x67/0x110
 [<c0473dd0>] ? synchronize_sched+0x10/0x50
 [<c0795d66>] ? unregister_netdevice+0x16/0x60
 [<c083dd11>] ? mutex_lock+0x11/0x40
 [<c0795dbf>] ? unregister_netdev+0xf/0x20
 [<e16ad9c8>] ? __vif_delif+0x38/0x40 [switch]
 [<e16ada87>] ? sw_vif_delif+0x77/0x90 [switch]
 [<e16ad6e4>] ? sw_deviceless_ioctl+0xd64/0xf60 [switch]
 [<c05acd54>] ? avc_has_perm+0x64/0x80
 [<c05ae3d3>] ? inode_has_perm+0x63/0xc0
 [<c0457f30>] ? __wake_up_parent+0x20/0x30
 [<c046b670>] ? do_notify_parent_cldstop+0x100/0x130
 [<e16ae059>] ? sw_sock_ioctl+0x29/0x50 [switch]
 [<c0783f0f>] ? sock_ioctl+0x6f/0x260
 [<c0783ea0>] ? sock_ioctl+0x0/0x260
 [<c053d8ab>] ? vfs_ioctl+0x1b/0xa0
 [<c053da8c>] ? do_vfs_ioctl+0x6c/0x5c0
 [<c053e056>] ? sys_ioctl+0x76/0x90
 [<c083f074>] ? syscall_call+0x7/0xb