Description of problem:
boot after yumex update

Additional info:
reporter:       libreport-2.1.12
WARNING: CPU: 0 PID: 300 at lib/dma-debug.c:491 add_dma_entry+0x127/0x130()
DMA-API: exceeded 7 overlapping mappings of pfn 2137
Modules linked in: arc4 iwldvm mac80211 x86_pkg_temp_thermal coretemp iwlwifi uvcvideo kvm_intel videobuf2_vmalloc rtsx_pci_sdmmc videobuf2_memops mmc_core videobuf2_core rtsx_pci_ms memstick snd_hda_codec_hdmi iTCO_wdt iTCO_vendor_support videodev kvm snd_hda_codec_via snd_hda_codec_generic cfg80211 media snd_hda_intel snd_hda_codec rtsx_pci crct10dif_pclmul snd_hwdep crc32_pclmul rfkill crc32c_intel ghash_clmulni_intel snd_seq snd_seq_device snd_pcm shpchp mei_me mei joydev tpm_infineon serio_raw snd_timer snd lpc_ich soundcore wmi tpm_tis i2c_i801 tpm microcode mfd_core i915 i2c_algo_bit drm_kms_helper r8169 drm mii i2c_core video usb_storage
CPU: 0 PID: 300 Comm: usb-storage Not tainted 3.14.0-0.rc0.git19.1.fc21.x86_64 #1
Hardware name: System76, Inc. Gazelle Professional/Gazelle Professional, BIOS 4.6.5 09/27/2012
 0000000000000000 000000001394a566 ffff88020df0b978 ffffffff817cedf2
 ffff88020df0b9c0 ffff88020df0b9b0 ffffffff810969dd 0000000000002137
 ffff8800d3f0a8a0 0000000000000092 ffffffff82d645c0 0000000000000092
Call Trace:
 [<ffffffff817cedf2>] dump_stack+0x4d/0x66
 [<ffffffff810969dd>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff81096a5c>] warn_slowpath_fmt+0x5c/0x80
 [<ffffffff813f34fd>] ? active_pfn_read_overlap+0x2d/0x50
 [<ffffffff813f3ac7>] add_dma_entry+0x127/0x130
 [<ffffffff813f419d>] debug_dma_map_sg+0x13d/0x180
 [<ffffffff8157b248>] usb_hcd_map_urb_for_dma+0x428/0x700
 [<ffffffff8157b70d>] usb_hcd_submit_urb+0x1ed/0xaf0
 [<ffffffff810f8ac9>] ? mark_held_locks+0xb9/0x140
 [<ffffffff810feb51>] ? __raw_spin_lock_init+0x21/0x60
 [<ffffffff8157d28c>] usb_submit_urb+0x31c/0x5c0
 [<ffffffff8157e69c>] usb_sg_wait+0x8c/0x190
 [<ffffffffa00014ab>] usb_stor_bulk_transfer_sglist.part.4+0x8b/0xf0 [usb_storage]
 [<ffffffffa0001581>] usb_stor_bulk_srb+0x71/0x80 [usb_storage]
 [<ffffffffa00016ec>] usb_stor_Bulk_transport+0x15c/0x360 [usb_storage]
 [<ffffffffa0001f6b>] usb_stor_invoke_transport+0x3b/0x570 [usb_storage]
 [<ffffffff810f8ac9>] ? mark_held_locks+0xb9/0x140
 [<ffffffff817d804c>] ? _raw_spin_unlock_irq+0x2c/0x40
 [<ffffffffa0000b9e>] usb_stor_transparent_scsi_command+0xe/0x10 [usb_storage]
 [<ffffffffa0002e66>] usb_stor_control_thread+0x176/0x290 [usb_storage]
 [<ffffffffa0002cf0>] ? fill_inquiry_response+0x20/0x20 [usb_storage]
 [<ffffffffa0002cf0>] ? fill_inquiry_response+0x20/0x20 [usb_storage]
 [<ffffffff810c45df>] kthread+0xff/0x120
 [<ffffffff810c44e0>] ? insert_kthread_work+0x80/0x80
 [<ffffffff817e2bbc>] ret_from_fork+0x7c/0xb0
 [<ffffffff810c44e0>] ? insert_kthread_work+0x80/0x80