[Bug 103448] Warning during flashing workqueue

Sat Jan 6 17:11:05 UTC 2018

https://bugs.freedesktop.org/show_bug.cgi?id=103448

--- Comment #3 from wolf at wolfsden.cz ---
Hi, I checked journal on my system and there is one more:

```
Nov 17 01:21:43 dennas kernel: workqueue: PF_MEMALLOC task 42(khugepaged) is
flushing !WQ_MEM_RECLAIM i915-userptr-release:          (null)
Nov 17 01:21:43 dennas kernel: ------------[ cut here ]------------
Nov 17 01:21:43 dennas kernel: WARNING: CPU: 3 PID: 42 at
kernel/workqueue.c:2412 check_flush_dependency+0xf3/0x100
Nov 17 01:21:43 dennas kernel: Modules linked in: tun veth cfg80211 bridge stp
llc xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack
libcrc32c crc32c_generic iptable_filter snd_hda_codec_realtek
snd_hda_codec_generic snd_hda_codec_hdmi iTCO_wdt iTCO_vendor_support mxm_wmi
intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm
irqbypass snd_hda_intel intel_cstate intel_rapl_perf snd_hda_codec pcspkr
hci_uart e1000e i2c_i801 snd_hda_core snd_hwdep snd_pcm evdev tpm_tis joydev
snd_timer mousedev btbcm tpm_tis_core snd input_leds btqca igb ptp pps_core
mei_me dca led_class soundcore intel_pch_thermal mei mac_hid tpm btintel
bluetooth i915 battery ecdh_generic rfkill wmi pinctrl_sunrisepoint
intel_lpss_acpi crc16 pinctrl_intel intel_lpss video i2c_hid button intel_gtt
acpi_als shpchp
Nov 17 01:21:43 dennas kernel:  kfifo_buf industrialio acpi_pad sch_fq_codel
ip_tables x_tables btrfs xor raid6_pq algif_skcipher af_alg dm_crypt dm_mod dax
hid_logitech_hidpp hid_logitech_dj hid_generic usbhid hid sd_mod
crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel pcbc aesni_intel
aes_x86_64 crypto_simd glue_helper cryptd ahci libahci xhci_pci libata xhci_hcd
usbcore scsi_mod usb_common serio amdgpu i2c_algo_bit drm_kms_helper
syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm agpgart
Nov 17 01:21:43 dennas kernel: CPU: 3 PID: 42 Comm: khugepaged Tainted: G     U
         4.13.12-1-ARCH #1
Nov 17 01:21:43 dennas kernel: Hardware name: To Be Filled By O.E.M. To Be
Filled By O.E.M./Z170 Extreme7+, BIOS P7.40 05/04/2017
Nov 17 01:21:43 dennas kernel: task: ffff992c73082e80 task.stack:
ffffb70bc1a44000
Nov 17 01:21:43 dennas kernel: RIP: 0010:check_flush_dependency+0xf3/0x100
Nov 17 01:21:43 dennas kernel: RSP: 0018:ffffb70bc1a476a0 EFLAGS: 00010286
Nov 17 01:21:43 dennas kernel: RAX: 000000000000006c RBX: ffff992c397b2600 RCX:
ffffffff9ca55328
Nov 17 01:21:43 dennas kernel: RDX: 0000000000000000 RSI: 0000000000000082 RDI:
0000000000000287
Nov 17 01:21:43 dennas kernel: RBP: ffffb70bc1a476c0 R08: 0000000000006040 R09:
ffffffff9cca68e0
Nov 17 01:21:43 dennas kernel: R10: ffffb70bc1a47790 R11: 0000000000000000 R12:
0000000000000000
Nov 17 01:21:43 dennas kernel: R13: ffff992c73082e80 R14: 0000000000000000 R15:
ffffb70bc1a47700
Nov 17 01:21:43 dennas kernel: FS:  0000000000000000(0000)
GS:ffff992c85d80000(0000) knlGS:0000000000000000
Nov 17 01:21:43 dennas kernel: CS:  0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Nov 17 01:21:43 dennas kernel: CR2: 00007f95842dd000 CR3: 00000001c7a09000 CR4:
00000000003406e0
Nov 17 01:21:43 dennas kernel: Call Trace:
Nov 17 01:21:43 dennas kernel:  flush_workqueue+0x13b/0x3f0
Nov 17 01:21:43 dennas kernel: 
i915_gem_userptr_mn_invalidate_range_start+0x148/0x160 [i915]
Nov 17 01:21:43 dennas kernel:  ?
i915_gem_userptr_mn_invalidate_range_start+0x148/0x160 [i915]
Nov 17 01:21:43 dennas kernel:  __mmu_notifier_invalidate_range_start+0x55/0x80
Nov 17 01:21:43 dennas kernel:  try_to_unmap_one+0x6fa/0x790
Nov 17 01:21:43 dennas kernel:  rmap_walk_file+0xec/0x230
Nov 17 01:21:43 dennas kernel:  rmap_walk+0x41/0x60
Nov 17 01:21:43 dennas kernel:  try_to_unmap+0x91/0xf0
Nov 17 01:21:43 dennas kernel:  ? page_remove_rmap+0x2a0/0x2a0
Nov 17 01:21:43 dennas kernel:  ? page_not_mapped+0x20/0x20
Nov 17 01:21:43 dennas kernel:  ? page_get_anon_vma+0xa0/0xa0
Nov 17 01:21:43 dennas kernel:  migrate_pages+0x70d/0x9c0
Nov 17 01:21:43 dennas kernel:  ? __ClearPageMovable+0x10/0x10
Nov 17 01:21:43 dennas kernel:  ? isolate_freepages_block+0x3c0/0x3c0
Nov 17 01:21:43 dennas kernel:  compact_zone+0x675/0x950
Nov 17 01:21:43 dennas kernel:  compact_zone_order+0xa0/0xd0
Nov 17 01:21:43 dennas kernel:  try_to_compact_pages+0xba/0x2b0
Nov 17 01:21:43 dennas kernel:  ? try_to_compact_pages+0xba/0x2b0
Nov 17 01:21:43 dennas kernel:  __alloc_pages_direct_compact+0x51/0xf0
Nov 17 01:21:43 dennas kernel:  __alloc_pages_slowpath+0xae5/0xe10
Nov 17 01:21:43 dennas kernel:  ? dequeue_task_fair+0x49f/0x640
Nov 17 01:21:43 dennas kernel:  ? finish_task_switch+0x75/0x200
Nov 17 01:21:43 dennas kernel:  ? get_page_from_freelist+0x349/0xb00
Nov 17 01:21:43 dennas kernel:  ? del_timer_sync+0x39/0x40
Nov 17 01:21:43 dennas kernel:  __alloc_pages_nodemask+0x237/0x250
Nov 17 01:21:43 dennas kernel:  khugepaged+0x102a/0x1f70
Nov 17 01:21:43 dennas kernel:  ? wait_woken+0x80/0x80
Nov 17 01:21:43 dennas kernel:  kthread+0x125/0x140
Nov 17 01:21:43 dennas kernel:  ? __collapse_huge_page_swapin+0x440/0x440
Nov 17 01:21:43 dennas kernel:  ? kthread_create_on_node+0x70/0x70
Nov 17 01:21:43 dennas kernel:  ret_from_fork+0x25/0x30
Nov 17 01:21:43 dennas kernel: Code: 00 8b b0 30 05 00 00 48 8d 8b b0 00 00 00
48 8d 90 d8 06 00 00 4d 89 e0 48 c7 c7 a0 70 93 9c c6 05 e5 fe a4 00 01 e8 7e
74 04 00 <0f> ff e9 6b ff ff ff 66 0f 1f 44 00 00 0f 1f 44 00 00 48 8b 37 
Nov 17 01:21:43 dennas kernel: ---[ end trace e1a8cbe8e0f397a4 ]---
```

When I grep it all

```
[root at dennas ~]# journalctl  | grep WQ_MEM_RECLAIM
Oct 25 03:27:03 dennas kernel: workqueue: PF_MEMALLOC task 42(khugepaged) is
flushing !WQ_MEM_RECLAIM i915-userptr-release:          (null)
Nov 17 01:21:43 dennas kernel: workqueue: PF_MEMALLOC task 42(khugepaged) is
flushing !WQ_MEM_RECLAIM i915-userptr-release:          (null)
```

first one is the original, second one is new one.

Was the fix supposed to be in 4.13.12?

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