[Bug 98829] [BDW] oops in intel_unpin_fb_obj

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98829

--- Comment #7 from Zlatko Calusic <zcalusic at bitsync.net> ---
Happens occasionally during logout from lightdm session. Afterwards, SysRq
reboot is required. Skylake i7-6700K, 4.10.0-rc3+.

Jan 16 10:18:53 atlas kernel: BUG: unable to handle kernel NULL pointer
dereference at 0000000000000078
Jan 16 10:18:53 atlas kernel: IP: intel_unpin_fb_obj+0x63/0xd0 [i915]
Jan 16 10:18:53 atlas kernel: PGD 0 
Jan 16 10:18:53 atlas kernel: 
Jan 16 10:18:53 atlas kernel: Oops: 0000 [#1] PREEMPT SMP
Jan 16 10:18:53 atlas kernel: Modules linked in: cpuid btrfs ufs qnx4 hfsplus
hfs minix ntfs vfat msdos fat jfs xfs dm_mod uas usb_storage loop drbg
ansi_cprng authenc echainiv xfrm6_mode_tunnel xfrm4_mode_tunnel hmac xfrm_user
xfrm4_tunnel tunnel4 ipcomp xfrm_ipcomp fuse esp4 ah4 af_key xfrm_algo
ip6table_filter ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6
ip6_tables xt_tcpudp xt_conntrack iptable_filter iptable_nat nf_conntrack_ipv4
nf_defrag_ipv4 nf_nat_ipv4 nf_nat crc32c_generic binfmt_misc snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic intel_rapl x86_pkg_temp_thermal
intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul eeepc_wmi
crc32_pclmul asus_wmi sparse_keymap ghash_clmulni_intel mxm_wmi pcbc
aesni_intel aes_x86_64 crypto_simd glue_helper cryptd intel_cstate
snd_hda_intel
Jan 16 10:18:53 atlas kernel:  snd_hda_codec snd_hda_core snd_hwdep
intel_uncore snd_pcm snd_timer snd intel_rapl_perf iTCO_wdt mei_me joydev
serio_raw pcspkr soundcore iTCO_vendor_support sg shpchp mei hci_uart btbcm
btqca btintel battery wmi bluetooth rfkill intel_lpss_acpi intel_lpss mfd_core
acpi_als tpm_tis evdev acpi_pad tpm_tis_core kfifo_buf industrialio tpm
nf_conntrack msr zram zsmalloc ip_tables x_tables autofs4 ext4 crc16 jbd2
fscrypto mbcache raid10 raid456 async_raid6_recov async_memcpy async_pq
async_xor async_tx xor raid6_pq libcrc32c multipath linear raid1 raid0 md_mod
sd_mod hid_generic usbhid ahci libahci crc32c_intel sata_sil24 i915 psmouse
e1000e i2c_algo_bit ptp xhci_pci nvme pps_core i2c_i801 xhci_hcd drm_kms_helper
nvme_core libata usbcore drm scsi_mod fan thermal video i2c_hid hid button fjes
Jan 16 10:18:53 atlas kernel: CPU: 0 PID: 4277 Comm: kworker/u16:0 Not tainted
4.10.0-rc3+ #1
Jan 16 10:18:53 atlas kernel: Hardware name: System manufacturer System Product
Name/Z170-A, BIOS 2202 09/19/2016
Jan 16 10:18:53 atlas kernel: Workqueue: i915 intel_unpin_work_fn [i915]
Jan 16 10:18:53 atlas kernel: task: ffff9fabf3ab9e80 task.stack:
ffffb8af60e24000
Jan 16 10:18:53 atlas kernel: RIP: 0010:intel_unpin_fb_obj+0x63/0xd0 [i915]
Jan 16 10:18:53 atlas kernel: RSP: 0018:ffffb8af60e27de8 EFLAGS: 00010246
Jan 16 10:18:53 atlas kernel: RAX: 0000000000000000 RBX: ffff9faa7f21f700 RCX:
0000000000000001
Jan 16 10:18:53 atlas kernel: RDX: ffffb8af60e27de8 RSI: ffff9fac54c03908 RDI:
ffff9faa7f21f700
Jan 16 10:18:53 atlas kernel: RBP: ffff9fa94b96a500 R08: ffff9fa99f7a9f08 R09:
0000000000000002
Jan 16 10:18:53 atlas kernel: R10: 000000000000008a R11: 0000000000000075 R12:
0000000000000001
Jan 16 10:18:53 atlas kernel: R13: ffff9fac54c00000 R14: ffff9fac5b5e9c00 R15:
ffff9fac54c00068
Jan 16 10:18:53 atlas kernel: FS:  0000000000000000(0000)
GS:ffff9fac6ec00000(0000) knlGS:0000000000000000
Jan 16 10:18:53 atlas kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jan 16 10:18:53 atlas kernel: CR2: 0000000000000078 CR3: 0000000373809000 CR4:
00000000003406f0
Jan 16 10:18:53 atlas kernel: Call Trace:
Jan 16 10:18:53 atlas kernel:  ? intel_unpin_work_fn+0x50/0x120 [i915]
Jan 16 10:18:53 atlas kernel:  ? process_one_work+0x18e/0x440
Jan 16 10:18:53 atlas kernel:  ? worker_thread+0x4a/0x480
Jan 16 10:18:53 atlas kernel:  ? kthread+0xf4/0x130
Jan 16 10:18:53 atlas kernel:  ? process_one_work+0x440/0x440
Jan 16 10:18:53 atlas kernel:  ? kthread_create_on_node+0x60/0x60
Jan 16 10:18:53 atlas kernel:  ? ret_from_fork+0x25/0x30
Jan 16 10:18:53 atlas kernel: Code: a9 fc ff ff ff 74 64 44 89 e2 48 89 ee 48
89 e7 e8 73 30 ff ff 48 8b 43 08 48 89 e2 48 89 df 48 8d b0 08 39 00 00 e8 bd
25 fc ff <48> 8b 50 78 48 85 d2 74 04 83 6a 20 01 48 89 c7 e8 c8 6b fc ff 
Jan 16 10:18:53 atlas kernel: RIP: intel_unpin_fb_obj+0x63/0xd0 [i915] RSP:
ffffb8af60e27de8
Jan 16 10:18:53 atlas kernel: CR2: 0000000000000078
Jan 16 10:18:53 atlas kernel: ---[ end trace 97044bd2bd6079bb ]---

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