Description of problem:
Simply booted the system and the error occurred.

Additional info:
reporter:       libreport-2.9.5
WARNING: CPU: 0 PID: 155 at fs/sysfs/group.c:235 sysfs_remove_group+0x76/0x80
Modules linked in: fuse rfcomm xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 tun devlink uhid nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_nat ebtable_broute bridge stp llc ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle iscsi_tcp ip6table_raw libiscsi_tcp libiscsi ip6table_security iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat scsi_transport_iscsi nf_conntrack libcrc32c iptable_mangle iptable_raw iptable_security ebtable_filter ebtables ip6table_filter ip6_tables cmac bnep sunrpc rmi_smbus rmi_core arc4 intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp mei_wdt kvm_intel gpio_ich iTCO_wdt iTCO_vendor_support iwlmvm kvm mac80211 irqbypass intel_cstate
 snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic intel_uncore snd_hda_intel intel_rapl_perf uvcvideo snd_hda_codec iwlwifi btusb videobuf2_vmalloc videobuf2_memops btrtl btbcm videobuf2_v4l2 videobuf2_common btintel videodev snd_hda_core bluetooth snd_hwdep joydev snd_seq media snd_seq_device cfg80211 wmi_bmof snd_pcm cdc_acm ecdh_generic rtsx_pci_ms mei_me lpc_ich memstick mei thinkpad_acpi i2c_i801 snd_timer snd soundcore rfkill ie31200_edac shpchp pcc_cpufreq dm_crypt hid_microsoft hid_cherry cdc_mbim cdc_wdm cdc_ncm usbnet mii nouveau i915 rtsx_pci_sdmmc mmc_core mxm_wmi ttm i2c_algo_bit crct10dif_pclmul crc32_pclmul drm_kms_helper crc32c_intel e1000e ghash_clmulni_intel drm serio_raw rtsx_pci wmi video
CPU: 0 PID: 155 Comm: kworker/u16:6 Not tainted 4.17.12-200.fc28.x86_64 #1
Hardware name: LENOVO 20BE00B8GE/20BE00B8GE, BIOS GMET69WW (2.17 ) 01/12/2015
Workqueue: scsi_wq_6 __iscsi_unbind_session [scsi_transport_iscsi]
RIP: 0010:sysfs_remove_group+0x76/0x80
RSP: 0018:ffffa8ab02983da8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000006
RDX: 0000000000000007 RSI: 0000000000000096 RDI: ffff9c78be216930
RBP: ffffffff8bead5c0 R08: 0000000000000048 R09: 0000000000000443
R10: 0000000000000000 R11: 0000000000000001 R12: ffff9c778cd67c38
R13: ffff9c7887c4e810 R14: ffff9c7887c4e7f0 R15: ffff9c7887c4e800
FS:  0000000000000000(0000) GS:ffff9c78be200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560c0aeac2f0 CR3: 000000004e20a004 CR4: 00000000001606f0
Call Trace:
 device_del+0x56/0x350
 ? show_priv_session_recovery_tmo+0x40/0x40 [scsi_transport_iscsi]
 ? attribute_container_device_trigger+0xb4/0xf0
 scsi_target_reap+0x53/0x60
 scsi_remove_target+0x1a2/0x1d0
 __iscsi_unbind_session+0xb3/0x160 [scsi_transport_iscsi]
 process_one_work+0x187/0x340
 worker_thread+0x2e/0x380
 ? pwq_unbound_release_workfn+0xd0/0xd0
 kthread+0x112/0x130
 ? kthread_create_worker_on_cpu+0x70/0x70
 ret_from_fork+0x35/0x40
Code: ff 48 89 df 5b 5d 41 5c e9 98 c1 ff ff 48 89 df e8 70 c1 ff ff eb cb 49 8b 14 24 48 8b 75 00 48 c7 c7 68 66 0e 8c e8 54 fa d7 ff <0f> 0b 5b 5d 41 5c c3 0f 1f 00 0f 1f 44 00 00 41 56 41 55 41 54