Backtrace

WARNING: CPU: 2 PID: 185258 at kernel/workqueue.c:2614 check_flush_dependency+0x10a/0x120
Modules linked in: xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_reject_ipv4 ip6table_mangle ip6table_nat iptable_mangle iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter tun bridge stp llc rpcsec_gss_krb5 auth_rpcgss md4 nls_utf8 nfsv4 cifs nfs libarc4 lockd dns_resolver grace fscache netfs libdes rfkill sunrpc snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio intel_rapl_msr intel_rapl_common snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec intel_tcc_cooling x86_pkg_temp_thermal intel_powerclamp snd_hda_core coretemp snd_hwdep iTCO_wdt kvm_intel snd_seq intel_pmc_bxt mei_hdcp snd_seq_device ppdev iTCO_vendor_support kvm ee1004 snd_pcm irqbypass rapl snd_timer intel_cstate intel_uncore snd i2c_i801 joydev soundcore i2c_smbus intel_wmi_thunderbolt mei_me mei intel_pch_thermal parport_pc parport acpi_pad binfmt_misc zram ip_tables i915 i2c_algo_bit uas
 ttm usb_storage drm_kms_helper crct10dif_pclmul crc32_pclmul cec crc32c_intel r8169 drm ghash_clmulni_intel video wmi fuse ecryptfs
CPU: 2 PID: 185258 Comm: kworker/2:0 Not tainted 5.14.18-100.fc33.x86_64 #1
Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./Z170-HD3P-CF, BIOS F5 03/07/2016
Workqueue: deferredclose smb2_deferred_work_close [cifs]
RIP: 0010:check_flush_dependency+0x10a/0x120
Code: 4c 24 18 48 8d b2 b0 00 00 00 49 89 e8 48 8d 8b b0 00 00 00 48 c7 c7 18 2a 5c b8 c6 05 44 cd e1 01 01 4c 89 ca e8 54 06 ad 00 <0f> 0b e9 11 ff ff ff 80 3d 2f cd e1 01 00 75 91 e9 43 ff ff ff 90
RSP: 0018:ffff977e0116fc58 EFLAGS: 00010292
RAX: 0000000000000078 RBX: ffff8c11c026ac00 RCX: ffff8c1911c98a08
RDX: 00000000ffffffd8 RSI: 0000000000000027 RDI: ffff8c1911c98a00
RBP: 0000000000000000 R08: 0000000000000000 R09: ffff977e0116fa90
R10: ffff977e0116fa88 R11: ffffffffb8d47468 R12: ffff8c134f7bc480
R13: ffff8c142b9dd080 R14: ffff8c11c026ac68 R15: ffff8c12790a2198
FS:  0000000000000000(0000) GS:ffff8c1911c80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055dbce076000 CR3: 0000000494c10002 CR4: 00000000003706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 flush_workqueue+0x10c/0x410
 generic_shutdown_super+0x2f/0x110
 kill_anon_super+0x14/0x30
 cifs_kill_sb+0x7e/0x90 [cifs]
 deactivate_locked_super+0x36/0xa0
 cifsFileInfo_put_final+0x128/0x140 [cifs]
 _cifsFileInfo_put+0x21b/0x3f0 [cifs]
 ? smb2_deferred_work_close+0x30/0x60 [cifs]
 ? __raw_callee_save___native_queued_spin_unlock+0x11/0x1e
 process_one_work+0x1ec/0x390
 worker_thread+0x53/0x3e0
 ? process_one_work+0x390/0x390
 kthread+0x127/0x150
 ? set_kthread_struct+0x40/0x40
 ret_from_fork+0x22/0x30