Backtrace

WARNING: CPU: 1 PID: 142 at kernel/workqueue.c:2598 check_flush_dependency+0xa0/0x130
Modules linked in: ccm rfcomm nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_REJECT nf_reject_ipv6 ip6t_rpfilter ipt_REJECT nf_reject_ipv4 xt_conntrack ebtable_nat ebtable_broute 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 libcrc32c ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter cmac bnep sunrpc vfat fat squashfs zstd_decompress loop cros_ec_lightbar cros_ec_sysfs snd_soc_sst_cht_bsw_rt5645 iTCO_wdt iTCO_vendor_support joydev cros_ec_dev intel_powerclamp coretemp intel_rapl_msr kvm_intel kvm uvcvideo btusb btrtl videobuf2_vmalloc videobuf2_memops sof_acpi_dev btbcm snd_sof_intel_byt videobuf2_v4l2 btintel snd_sof_intel_bdw videobuf2_common snd_sof_intel_ipc iwlmvm bluetooth snd_sof irqbypass crct10dif_pclmul crc32_pclmul mac80211 libarc4 snd_sof_xtensa_dsp videodev iwlwifi ghash_clmulni_intel snd_soc_rt5645
 snd_intel_sst_acpi intel_cstate snd_intel_sst_core snd_soc_sst_atom_hifi2_platform snd_soc_rt5640 mc snd_soc_acpi_intel_match snd_soc_rl6231 snd_soc_acpi cfg80211 snd_soc_core ecdh_generic snd_hda_codec_hdmi snd_hda_intel ecc snd_hda_codec snd_hda_core snd_hwdep snd_compress snd_seq ac97_bus lpc_ich snd_pcm_dmaengine rfkill snd_seq_device snd_pcm intel_xhci_usb_role_switch roles cros_ec_lpcs cros_ec_core snd_timer elan_i2c processor_thermal_device snd dw_dmac intel_rapl_common int3403_thermal int340x_thermal_zone int3400_thermal intel_soc_dts_iosf soundcore acpi_thermal_rel ip_tables i915 mmc_block i2c_algo_bit drm_kms_helper sdhci_pci cqhci sdhci crc32c_intel drm serio_raw mmc_core video fuse
CPU: 1 PID: 142 Comm: kswapd0 Not tainted 5.3.7-301.fc31.x86_64 #1
Hardware name: GOOGLE Banon/Banon, BIOS MrChromebox-4.11.1 12/01/2019
RIP: 0010:check_flush_dependency+0xa0/0x130
Code: 8d 8a 18 07 00 00 49 89 e8 48 8d 8b b0 00 00 00 4c 89 ca 48 c7 c7 28 0c 13 ab 48 89 04 24 c6 05 83 2c 44 01 01 e8 9e 2b fe ff <0f> 0b 48 8b 04 24 eb 10 4c 89 e7 e8 80 81 00 00 41 f6 44 24 25 08
RSP: 0018:ffffb0a64011f8d0 EFLAGS: 00010086
RAX: 0000000000000000 RBX: ffff8b507680ae00 RCX: 0000000000000000
RDX: 0000000000000063 RSI: ffffffffabbe7883 RDI: 0000000000000046
RBP: ffffffffc0284780 R08: 00000641e2e14324 R09: 0000000000000063
R10: ffffffffabbe7c00 R11: 00000000abbe786b R12: ffff8b5076bf1e00
R13: ffff8b507b62d700 R14: 0000000000000001 R15: 0000000000000013
FS:  0000000000000000(0000) GS:ffff8b507b700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f713ece8000 CR3: 000000004040a000 CR4: 00000000001006e0
Call Trace:
 __flush_work+0x92/0x1c0
 __cancel_work_timer+0x107/0x190
 ? _cond_resched+0x15/0x30
 ? synchronize_irq+0x3a/0xa0
 ? fwtable_write32+0x4c/0x210 [i915]
 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+0xbc/0xd0 [i915]
 __intel_wakeref_put_last+0x17/0x50 [i915]
 i915_request_retire+0x1aa/0x370 [i915]
 ring_retire_requests+0x4e/0x60 [i915]
 i915_retire_requests+0x43/0x80 [i915]
 i915_gem_shrink+0xd3/0x510 [i915]
 ? __update_load_avg_se+0x217/0x300
 ? update_load_avg+0x76/0x600
 ? account_entity_enqueue+0x9c/0xd0
 i915_gem_shrinker_scan+0x63/0x110 [i915]
 do_shrink_slab+0x154/0x2c0
 ? check_preempt_curr+0x75/0x90
 shrink_slab+0xac/0x2b0
 shrink_node+0xf5/0x490
 balance_pgdat+0x2db/0x530
 kswapd+0x1fb/0x3c0
 ? finish_wait+0x80/0x80
 kthread+0xfb/0x130
 ? balance_pgdat+0x530/0x530
 ? kthread_park+0x80/0x80
 ret_from_fork+0x35/0x40