[Bug 95316] [Broadwell] Random crashes when starting KDE with DP-MST dual monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95316

--- Comment #1 from darkbasic <darkbasic at linuxsystems.it> ---
[   10.145960] ------------[ cut here ]------------
[   10.145993] WARNING: CPU: 3 PID: 728 at
drivers/gpu/drm/i915/intel_uncore.c:599 hsw_unclaimed_reg_debug+0x69/0x90
[i915]()
[   10.145995] Unclaimed register detected before writing to register 0x44414
[   10.145996] Modules linked in: bnep cdc_ether usbnet r8152 mii visor
uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core
videodev media btusb btrtl btbcm btintel bluetooth crc16 arc4 joydev mousedev
snd_soc_sst_broadwell nvram msr iwlmvm mac80211 hid_multitouch
snd_soc_sst_haswell_pcm snd_soc_sst_ipc iTCO_wdt iTCO_vendor_support
snd_soc_sst_dsp dell_wmi snd_hda_codec_hdmi intel_rapl iwlwifi
x86_pkg_temp_thermal dell_laptop intel_powerclamp dcdbas coretemp kvm_intel kvm
evdev input_leds mac_hid irqbypass psmouse serio_raw cfg80211 pcspkr rfkill
rtsx_pci_ms nls_iso8859_1 memstick nls_cp437 vfat fat elan_i2c snd_soc_ssm4567
snd_soc_rt286 snd_soc_rl6347a snd_soc_core snd_compress snd_pcm_dmaengine
ac97_bus i2c_hid i915 snd_hda_intel intel_pch_thermal drm_kms_helper
snd_hda_codec
[   10.146030]  mei_me drm mei snd_hda_core intel_gtt snd_hwdep snd_pcm
syscopyarea sysfillrect sysimgblt snd_timer i2c_i801 fb_sys_fops shpchp lpc_ich
snd i2c_algo_bit soundcore fan thermal wmi intel_hid sparse_keymap battery
int3403_thermal video fjes processor_thermal_device gpio_lynxpoint
snd_soc_sst_acpi i2c_designware_platform snd_soc_sst_match int3402_thermal
intel_soc_dts_iosf 8250_dw int340x_thermal_zone spi_pxa2xx_platform
i2c_designware_core int3400_thermal acpi_thermal_rel tpm_crb button tpm_tis
acpi_als ac tpm acpi_pad kfifo_buf industrialio processor sch_fq_codel
ip_tables x_tables btrfs xor raid6_pq jitterentropy_rng sha256_ssse3
sha256_generic hmac drbg ansi_cprng algif_skcipher af_alg uas usb_storage
dm_crypt dm_mod sd_mod rtsx_pci_sdmmc atkbd libps2 crct10dif_pclmul
crc32_pclmul crc32c_intel
[   10.146061]  ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul
glue_helper ablk_helper cryptd ahci libahci libata scsi_mod xhci_pci rtsx_pci
xhci_hcd i8042 serio sdhci_acpi sdhci led_class mmc_core pl2303 mos7720
usbserial parport hid_generic usbhid hid usbcore usb_common
[   10.146075] CPU: 3 PID: 728 Comm: Xorg Not tainted 4.5.2-1-ARCH #1
[   10.146076] Hardware name: Dell Inc. XPS 13 9343/0F5KF3, BIOS A07 11/11/2015
[   10.146077]  0000000000000086 00000000dae92b66 ffff88020e3f3b20
ffffffff812dad91
[   10.146079]  ffff88020e3f3b68 ffffffffa073dbe8 ffff88020e3f3b58
ffffffff81078e52
[   10.146080]  ffff880210b80000 ffff880210b80080 000000006ffff8ee
0000000000000002
[   10.146082] Call Trace:
[   10.146086]  [<ffffffff812dad91>] dump_stack+0x63/0x82
[   10.146091]  [<ffffffff81078e52>] warn_slowpath_common+0x82/0xc0
[   10.146093]  [<ffffffff81078eec>] warn_slowpath_fmt+0x5c/0x80
[   10.146105]  [<ffffffffa06a2e2c>] ? intel_execlists_submission+0x2ec/0x430
[i915]
[   10.146114]  [<ffffffffa06ac1f9>] hsw_unclaimed_reg_debug+0x69/0x90 [i915]
[   10.146121]  [<ffffffffa06b1f0c>] gen8_write32+0x6c/0x240 [i915]
[   10.146127]  [<ffffffffa065d9db>] bdw_update_pipe_irq+0x7b/0xe0 [i915]
[   10.146134]  [<ffffffffa065da7f>] gen8_enable_vblank+0x3f/0x60 [i915]
[   10.146140]  [<ffffffffa059f5c3>] drm_vblank_enable+0x73/0xd0 [drm]
[   10.146143]  [<ffffffffa059f6bc>] drm_vblank_get+0x9c/0xc0 [drm]
[   10.146147]  [<ffffffffa05a01f0>] drm_wait_vblank+0x90/0x5e0 [drm]
[   10.146150]  [<ffffffffa059d892>] drm_ioctl+0x152/0x540 [drm]
[   10.146153]  [<ffffffffa05a0160>] ? drm_modeset_ctl+0x60/0x60 [drm]
[   10.146156]  [<ffffffff810e4ffd>] ? enqueue_hrtimer+0x3d/0xa0
[   10.146158]  [<ffffffff8120a1f7>] ? __fget+0x77/0xb0
[   10.146161]  [<ffffffff811ffdd1>] do_vfs_ioctl+0xa1/0x5b0
[   10.146162]  [<ffffffff8120a1f7>] ? __fget+0x77/0xb0
[   10.146164]  [<ffffffff81200359>] SyS_ioctl+0x79/0x90
[   10.146166]  [<ffffffff815b0b6e>] entry_SYSCALL_64_fastpath+0x12/0x6d
[   10.146167] ---[ end trace a642226cc25efd4e ]---
[   11.642505] IPv6: ADDRCONF(NETDEV_CHANGE): enp0s20u2u1: link becomes ready
[   18.775122] QXcbEventReader[911]: segfault at 7f65d55c7a79 ip
00007f65d55c7a79 sp 00007f65d3a94de0 error 14 in
locale-archive[7f65d5a8a000+199000]

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