Additional info: reporter: libreport-2.2.3 WARNING: CPU: 0 PID: 1555 at block/cfq-iosched.c:1378 cfq_group_service_tree_del+0xd5/0xf0() Modules linked in: xt_CHECKSUM veth iptable_mangle tun xt_addrtype ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat bridge dm_thin_pool dm_persistent_data dm_bio_prison libcrc32c ebtable_nat ebtables loop fcoe libfcoe libfc 8021q garp stp scsi_transport_fc mrp scsi_tgt llc ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ip6_tables dm_crypt snd_hda_codec_hdmi uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core snd_hda_codec_conexant arc4 iwldvm snd_hda_codec_generic mac80211 videodev media snd_hda_intel snd_hda_controller iTCO_wdt iwlwifi hid_lenovo_tpkbd iTCO_vendor_support snd_hda_codec x86_pkg_temp_thermal coretemp kvm_intel sdhci_pci sdhci snd_hwdep kvm serio_raw cfg80211 snd_seq snd_seq_device thinkpad_acpi snd_pcm mmc_core mei_me lpc_ich snd_timer wmi mei crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel snd soundcore mfd_core microcode shpchp i2c_i801 rfkill nfsd auth_rpcgss nfs_acl lockd sunrpc binfmt_misc i915 e1000e i2c_algo_bit drm_kms_helper drm ptp pps_core i2c_core video CPU: 0 PID: 1555 Comm: systemd Not tainted 3.15.6-200.fc20.x86_64 #1 Hardware name: LENOVO 4174BH2/4174BH2, BIOS 8CET50WW (1.30 ) 11/01/2011 0000000000000000 000000000ec02846 ffff8803e278f5a8 ffffffff816ef48e 0000000000000000 ffff8803e278f5e0 ffffffff8108933d 0000000000000000 ffff8804051bc800 ffff8803e488f800 ffff880407945408 ffff8803e488f800 Call Trace: [<ffffffff816ef48e>] dump_stack+0x45/0x56 [<ffffffff8108933d>] warn_slowpath_common+0x7d/0xa0 [<ffffffff8108946a>] warn_slowpath_null+0x1a/0x20
Created attachment 920075 [details] File: dmesg
Do you have the rest of the backtrace on your machine still?
This bug is being closed with INSUFFICIENT_DATA as there has not been a response in over 3 weeks. If you are still experiencing this issue, please reopen and attach the relevant data from the latest kernel you are running and any data that might have been requested previously.
Sorry for not responding. I have realised recently that the laptop in question seems to have a hardware. It is likely that that was the cause of this crash.