Additional info:
reporter:       libreport-2.6.3
WARNING: CPU: 0 PID: 110 at kernel/workqueue.c:854 wq_worker_sleeping+0x91/0xa0()
Modules linked in: snd_hda_codec_idt(+) dell_laptop(+) snd_hda_codec_generic dell_wmi dcdbas i8k snd_hda_intel sparse_keymap snd_hda_controller drm iwlwifi joydev snd_hda_codec i2c_i801 snd_hda_core snd_hwdep cfg80211 snd_seq lpc_ich parport_pc snd_seq_device tpm_tis rfkill tpm snd_pcm snd_timer dell_smo8800 mfd_core parport shpchp snd intel_ips soundcore acpi_cpufreq nfsd auth_rpcgss nfs_acl lockd grace sunrpc e1000e sdhci_pci serio_raw sdhci firewire_ohci mmc_core firewire_core crc_itu_t yenta_socket ptp pps_core wmi video
CPU: 0 PID: 110 Comm: kworker/3:1 Not tainted 4.1.10-200.fc22.x86_64 #1
Hardware name: Dell Inc. Precision M4500/0RRH3K, BIOS A15 12/05/2013
Workqueue: events rfkill_sync_work [rfkill]
 0000000000000000 000000005fcdb0d1 ffff880036567a28 ffffffff8179a79d
 0000000000000000 0000000000000000 ffff880036567a68 ffffffff810a16aa
 0000000000017800 0000000000000000 0000000000017800 ffff8800cad9eca0
Call Trace:
 [<ffffffff8179a79d>] dump_stack+0x45/0x57
 [<ffffffff810a16aa>] warn_slowpath_common+0x8a/0xc0
 [<ffffffff810a17da>] warn_slowpath_null+0x1a/0x20
 [<ffffffff810bb971>] wq_worker_sleeping+0x91/0xa0
 [<ffffffff8179cae6>] __schedule+0x4d6/0x720
 [<ffffffff8179cd67>] schedule+0x37/0x90
 [<ffffffff8179fcbc>] schedule_timeout+0x17c/0x230
 [<ffffffff8179c853>] ? __schedule+0x243/0x720
 [<ffffffff8179e26f>] wait_for_completion+0xef/0x130
 [<ffffffff810ce7f0>] ? wake_up_state+0x20/0x20
 [<ffffffff8113ec64>] stop_one_cpu+0x64/0x90
 [<ffffffff810cc1d0>] ? sched_ttwu_pending+0x70/0x70
 [<ffffffff810cefa1>] set_cpus_allowed_ptr+0x1e1/0x1f0
 [<ffffffffa03a607f>] dcdbas_smi_request+0x7f/0x150 [dcdbas]
 [<ffffffffa03ce121>] dell_send_request+0x71/0x90 [dell_laptop]
 [<ffffffffa03ce4de>] dell_rfkill_set+0x2e/0x90 [dell_laptop]
 [<ffffffffa020ee51>] rfkill_set_block+0x91/0x150 [rfkill]
 [<ffffffffa020efc7>] rfkill_sync_work+0x37/0x50 [rfkill]
 [<ffffffff810bab2b>] process_one_work+0x1bb/0x410
 [<ffffffff810badd3>] worker_thread+0x53/0x480
 [<ffffffff810bad80>] ? process_one_work+0x410/0x410
 [<ffffffff810bad80>] ? process_one_work+0x410/0x410
 [<ffffffff810c0c48>] kthread+0xd8/0xf0
 [<ffffffff810c0b70>] ? kthread_worker_fn+0x180/0x180
 [<ffffffff817a1162>] ret_from_fork+0x42/0x70
 [<ffffffff810c0b70>] ? kthread_worker_fn+0x180/0x180

Potential duplicate: bug 1189884