Additional info:
reporter:       libreport-2.10.1
WARNING: CPU: 3 PID: 154 at kernel/workqueue.c:2600 check_flush_dependency+0x9d/0x130
Modules linked in: nls_utf8 isofs loop uas usb_storage tun ccm vfat fat mmc_block uinput nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 xt_conntrack ebtable_nat ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat iptable_mangle iptable_raw iptable_security nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables bnep sunrpc intel_rapl_msr intel_rapl_common x86_pkg_temp_thermal rmi_smbus intel_powerclamp rmi_core coretemp kvm_intel iwlmvm kvm snd_hda_codec_realtek mac80211 snd_hda_codec_generic iTCO_wdt mei_wdt iTCO_vendor_support snd_hda_codec_hdmi mei_hdcp libarc4 snd_hda_intel uvcvideo irqbypass snd_hda_codec videobuf2_vmalloc iwlwifi intel_cstate videobuf2_memops btusb intel_uncore videobuf2_v4l2 snd_hda_core btrtl btbcm videobuf2_common btintel intel_rapl_perf snd_hwdep bluetooth snd_seq videodev
 cfg80211 snd_seq_device joydev mc snd_pcm wmi_bmof thinkpad_acpi ecdh_generic rtsx_pci_ms ecc memstick snd_timer ledtrig_audio rfkill snd soundcore mei_me mei lpc_ich i2c_i801 binfmt_misc btrfs libcrc32c xor zstd_decompress zstd_compress raid6_pq dm_crypt hid_maltron i915 rtsx_pci_sdmmc mmc_core crct10dif_pclmul crc32_pclmul i2c_algo_bit crc32c_intel drm_kms_helper drm ghash_clmulni_intel e1000e serio_raw rtsx_pci wmi video fuse ecryptfs
CPU: 3 PID: 154 Comm: kswapd0 Not tainted 5.3.6-100.fc29.x86_64 #1
Hardware name: LENOVO 20ARS19C06/20ARS19C06, BIOS GJET82WW (2.32 ) 01/09/2015
RIP: 0010:check_flush_dependency+0x9d/0x130
Code: 07 00 00 8b b6 30 05 00 00 48 8d 8b b0 00 00 00 49 89 e8 48 c7 c7 78 18 13 ac 48 89 04 24 c6 05 a6 30 44 01 01 e8 0c 34 fe ff <0f> 0b 48 8b 04 24 eb 10 4c 89 e7 e8 93 81 00 00 41 f6 44 24 25 08
RSP: 0018:ffffb3dec01c38e8 EFLAGS: 00010082
RAX: 0000000000000000 RBX: ffff997c5080ce00 RCX: 0000000000000000
RDX: 0000000000000063 RSI: ffffffffacbe7883 RDI: 0000000000000046
RBP: ffffffffc0466870 R08: ffffffffacbe7820 R09: 0000000000028100
R10: 00028bc1dff6816a R11: 000000000000009a R12: ffff997c4ff89f40
R13: 0000000000000001 R14: ffff997c52428200 R15: ffffb3dec01c3b80
FS:  0000000000000000(0000) GS:ffff997c524c0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f64bdee0000 CR3: 00000001a4d12002 CR4: 00000000001606e0
Call Trace:
 __flush_work+0x97/0x1c0
 ? try_to_wake_up+0x211/0x640
 ? work_busy+0x80/0x80
 __cancel_work_timer+0x10a/0x190
 ? _cond_resched+0x15/0x30
 ? synchronize_irq+0x3a/0xa0
 gen6_disable_rps_interrupts+0x7f/0xa0 [i915]
 gen6_rps_idle+0x1a/0xe0 [i915]
 intel_gt_park+0x54/0x60 [i915]
 __intel_wakeref_put_last+0x17/0x50 [i915]
 __engine_park+0x7d/0xd0 [i915]
 __intel_wakeref_put_last+0x17/0x50 [i915]
 i915_request_retire+0x1a5/0x380 [i915]
 ring_retire_requests+0x4c/0x60 [i915]
 i915_retire_requests+0x3d/0x80 [i915]
 i915_gem_shrink+0x3c3/0x560 [i915]
 i915_gem_shrinker_scan+0x61/0x110 [i915]
 do_shrink_slab+0x12c/0x2a0
 shrink_slab+0xac/0x2b0
 shrink_node+0xe7/0x4a0
 balance_pgdat+0x2cb/0x510
 kswapd+0x1f9/0x3d0
 ? finish_wait+0x80/0x80
 ? balance_pgdat+0x510/0x510
 kthread+0x112/0x130
 ? kthread_create_on_node+0x60/0x60
 ret_from_fork+0x35/0x40

Potential duplicate: bug 1768096