[Intel-gfx] i915 Skylake crash on 4.4-rc3

[Andy Lutomirski]

[53834.386369] traps: gnome-session-b[2308] general protection
ip:7f10efc1fc2b sp:7ffdfde31880 error:0 in
libc-2.22.so[7f10efba1000+1b7000]
[53834.687584] ------------[ cut here ]------------
[53834.687607] WARNING: CPU: 0 PID: 23730 at
drivers/gpu/drm/i915/i915_gem_context.c:144
i915_gem_context_free+0x196/0x1c0 [i915]()
[53834.687609] WARN_ON(!list_empty(&ppgtt->base.active_list))
[53834.687610] Modules linked in:
[53834.687612]  wmi_mof dell_wmi wmi(E) rfcomm fuse ccm cmac
xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 tun
nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter
ip6t_REJECT nf_reject_ipv6 xt_conntrack ebtable_broute bridge stp llc
ebtable_nat ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6
nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_raw
ip6table_security ip6table_filter ip6_tables iptable_nat
nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack
iptable_mangle iptable_raw iptable_security arc4 bnep iwlmvm mac80211
snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic
snd_hda_intel iwlwifi snd_hda_codec intel_rapl x86_pkg_temp_thermal
snd_hwdep coretemp snd_hda_core kvm_intel btusb snd_seq btrtl kvm
uvcvideo btbcm cfg80211 btintel bluetooth snd_seq_device
[53834.687656]  videobuf2_vmalloc snd_pcm videobuf2_memops
videobuf2_v4l2 hid_multitouch videobuf2_core sparse_keymap v4l2_common
videodev i2c_designware_platform i2c_designware_core vfat snd_timer
fat irqbypass dell_laptop snd dcdbas efi_pstore pcspkr joydev efivars
media rtsx_pci_ms rfkill soundcore i2c_i801 memstick
pinctrl_sunrisepoint pinctrl_intel intel_lpss_acpi int3400_thermal
int3403_thermal acpi_thermal_rel acpi_pad mei_me tpm_tis mei tpm
idma64 shpchp virt_dma acpi_als kfifo_buf processor_thermal_device
nfsd industrialio intel_soc_dts_iosf iosf_mbi intel_lpss_pci
int340x_thermal_zone intel_lpss auth_rpcgss nfs_acl lockd grace sunrpc
dm_crypt i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect
sysimgblt fb_sys_fops drm rtsx_pci_sdmmc mmc_core crct10dif_pclmul
crc32_pclmul crc32c_intel
[53834.687700]  serio_raw rtsx_pci i2c_hid video [last unloaded: wmi]
[53834.687706] CPU: 0 PID: 23730 Comm: kworker/u8:4 Tainted: G
W   E   4.4.0-rc3+ #19
[53834.687708] Hardware name: Dell Inc. XPS 13 9350/07TYC2, BIOS 1.0.4
10/19/2015
[53834.687726] Workqueue: i915 i915_gem_retire_work_handler [i915]
[53834.687728]  0000000000000000 00000000c62a1d15 ffff88017ffb7c70
ffffffff8142510c
[53834.687731]  ffff88017ffb7cb8 ffff88017ffb7ca8 ffffffff81092122
ffff8802adfd1240
[53834.687734]  ffff8802845dd800 ffff880284680000 ffff88017ffb7d70
ffff8802adfd12b8
[53834.687738] Call Trace:
[53834.687743]  [<ffffffff8142510c>] dump_stack+0x4e/0x82
[53834.687747]  [<ffffffff81092122>] warn_slowpath_common+0x82/0xc0
[53834.687750]  [<ffffffff810921bc>] warn_slowpath_fmt+0x5c/0x80
[53834.687764]  [<ffffffffa012b7c6>] i915_gem_context_free+0x196/0x1c0 [i915]
[53834.687777]  [<ffffffffa01392df>] i915_gem_request_free+0x9f/0xb0 [i915]
[53834.687792]  [<ffffffffa014e7f8>]
intel_execlists_retire_requests+0x138/0x190 [i915]
[53834.687806]  [<ffffffffa013b841>] i915_gem_retire_requests+0xd1/0xe0 [i915]
[53834.687827]  [<ffffffffa013bbc8>]
i915_gem_retire_work_handler+0x58/0x70 [i915]
[53834.687831]  [<ffffffff810aa832>] process_one_work+0x152/0x400
[53834.687834]  [<ffffffff810aab2b>] worker_thread+0x4b/0x440
[53834.687837]  [<ffffffff810aaae0>] ? process_one_work+0x400/0x400
[53834.687839]  [<ffffffff810aaae0>] ? process_one_work+0x400/0x400
[53834.687842]  [<ffffffff810b0648>] kthread+0xd8/0xf0
[53834.687845]  [<ffffffff810b0570>] ? kthread_worker_fn+0x150/0x150
[53834.687849]  [<ffffffff81811e8f>] ret_from_fork+0x3f/0x70
[53834.687851]  [<ffffffff810b0570>] ? kthread_worker_fn+0x150/0x150
[53834.690419] ---[ end trace 1802637761c0942d ]---

I think this happened when I started emacs.

My user session crashed, but the system is still usable after logging back in.

--Andy