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[vlee <1475437@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

------------[ cut here ]------------
WARNING: CPU: 0 PID: 712 at /build/linux-hzKv5F/linux-4.0.0/include/drm/ttm/ttm_bo_driver.h:855 qxl_surface_id_alloc+0x2e9/0x3b0 [qxl]()
Modules linked in: cfg80211 binfmt_misc kvm_intel kvm crct10dif_pclmul snd_hda_codec_generic crc32_pclmul ghash_clmulni_intel snd_hda_intel snd
aesni_intel snd_hda_codec aes_x86_64 snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event lrw gf128mul snd_rawmidi serio_raw glue_helper ablk_help
q snd_seq_device qxl ttm drm_kms_helper snd_timer drm snd i2c_piix4 mac_hid pvpanic 8250_fintek soundcore parport_pc ppdev lp parport autofs4 p
ta_acpi
CPU: 0 PID: 712 Comm: Xorg Not tainted 4.0.0-4-generic #7-Ubuntu
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20150306_163512-brownie 04/01/2014
 ffffffffc0365668 ffff88007b4b3b68 ffffffff817d0fa0 0000000000000007
 0000000000000000 ffff88007b4b3ba8 ffffffff81075b5a ffff880062cb95e0
 ffff880068702000 0000000000000412 ffff880068702058 ffff88007a676000
Call Trace:
 [<ffffffff817d0fa0>] dump_stack+0x45/0x57
 [<ffffffff81075b5a>] warn_slowpath_common+0x8a/0xc0
 [<ffffffff81075c4a>] warn_slowpath_null+0x1a/0x20
 [<ffffffffc03602f9>] qxl_surface_id_alloc+0x2e9/0x3b0 [qxl]
 [<ffffffffc035e9a4>] qxl_bo_check_id+0x34/0x50 [qxl]
 [<ffffffffc0362f63>] qxl_release_reserve_list+0xf3/0x120 [qxl]
 [<ffffffffc036261b>] qxl_process_single_command+0x54b/0x790 [qxl]
 [<ffffffffc036289f>] qxl_execbuffer_ioctl+0x3f/0xa0 [qxl]
 [<ffffffffc02b3b1f>] drm_ioctl+0x1df/0x680 [drm]
 [<ffffffff811acce0>] ? handle_mm_fault+0x330/0x560
 [<ffffffff81209910>] do_vfs_ioctl+0x2e0/0x4e0
 [<ffffffff810631b5>] ? trace_do_page_fault+0x45/0x100
 [<ffffffff81209b91>] SyS_ioctl+0x81/0xa0
 [<ffffffff817d7fcd>] system_call_fastpath+0x16/0x1b
---[ end trace d5efdc2555a18389 ]---

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1475437

Title:
  kernel warning /build/linux-
  hzKv5F/linux-4.0.0/include/drm/ttm/ttm_bo_driver.h:855
  qxl_surface_id_alloc

Status in linux package in Ubuntu:
  New

Bug description:
  ------------[ cut here ]------------
  WARNING: CPU: 0 PID: 712 at /build/linux-hzKv5F/linux-4.0.0/include/drm/ttm/ttm_bo_driver.h:855 qxl_surface_id_alloc+0x2e9/0x3b0 [qxl]()
  Modules linked in: cfg80211 binfmt_misc kvm_intel kvm crct10dif_pclmul snd_hda_codec_generic crc32_pclmul ghash_clmulni_intel snd_hda_intel snd
  aesni_intel snd_hda_codec aes_x86_64 snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event lrw gf128mul snd_rawmidi serio_raw glue_helper ablk_help
  q snd_seq_device qxl ttm drm_kms_helper snd_timer drm snd i2c_piix4 mac_hid pvpanic 8250_fintek soundcore parport_pc ppdev lp parport autofs4 p
  ta_acpi
  CPU: 0 PID: 712 Comm: Xorg Not tainted 4.0.0-4-generic #7-Ubuntu
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20150306_163512-brownie 04/01/2014
   ffffffffc0365668 ffff88007b4b3b68 ffffffff817d0fa0 0000000000000007
   0000000000000000 ffff88007b4b3ba8 ffffffff81075b5a ffff880062cb95e0
   ffff880068702000 0000000000000412 ffff880068702058 ffff88007a676000
  Call Trace:
   [<ffffffff817d0fa0>] dump_stack+0x45/0x57
   [<ffffffff81075b5a>] warn_slowpath_common+0x8a/0xc0
   [<ffffffff81075c4a>] warn_slowpath_null+0x1a/0x20
   [<ffffffffc03602f9>] qxl_surface_id_alloc+0x2e9/0x3b0 [qxl]
   [<ffffffffc035e9a4>] qxl_bo_check_id+0x34/0x50 [qxl]
   [<ffffffffc0362f63>] qxl_release_reserve_list+0xf3/0x120 [qxl]
   [<ffffffffc036261b>] qxl_process_single_command+0x54b/0x790 [qxl]
   [<ffffffffc036289f>] qxl_execbuffer_ioctl+0x3f/0xa0 [qxl]
   [<ffffffffc02b3b1f>] drm_ioctl+0x1df/0x680 [drm]
   [<ffffffff811acce0>] ? handle_mm_fault+0x330/0x560
   [<ffffffff81209910>] do_vfs_ioctl+0x2e0/0x4e0
   [<ffffffff810631b5>] ? trace_do_page_fault+0x45/0x100
   [<ffffffff81209b91>] SyS_ioctl+0x81/0xa0
   [<ffffffff817d7fcd>] system_call_fastpath+0x16/0x1b
  ---[ end trace d5efdc2555a18389 ]---

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