[Bug 96965] stuck on render ring; GPU HANG: ecode 9:0:0x86dffffd, in Xorg [9455], reason: Ring hung, action: reset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96965

--- Comment #1 from Peter Gervai <grin at grin.hu> ---
As a sidenote: plenty of ugly stuff is happening all the time, like the
following. The Net Wisdom says !wm_changed is harmless, but ugly nevertheless.
Resetting usually works, but hangs the machine for 2-5 seconds.

[233977.486646] ------------[ cut here ]------------
[233977.486661] WARNING: CPU: 1 PID: 9455 at
drivers/gpu/drm/i915/intel_pm.c:3586 skl_update_other_pipe_wm+0x406/0x420
[i915]
[233977.486662] WARN_ON(!wm_changed)
[233977.486663] Modules linked in:
[233977.486664]  nfnetlink_log cfg80211 zfs(POE) zunicode(POE) zcommon(POE)
znvpair(POE) spl(OE) zavl(POE) cpuid xt_NFQUEUE nft_queue nf_tables
nfnetlink_queu
[233977.486689]  snd_hda_codec_hdmi snd_seq_device asus_wmi mxm_wmi
sparse_keymap snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel
snd_hda_codec snd_
[233977.486709]  xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack
nf_conntrack nf_log_ipv4 nf_log_common xt_LOG xt_limit iptable_filter ip_tables
x_tab
[233977.486720] CPU: 1 PID: 9455 Comm: Xorg Tainted: P     U  W  OE  
4.6.4-xanmod6 #1
[233977.486721] Hardware name: System manufacturer System Product
Name/B150-PRO, BIOS 0604 11/19/2015
[233977.486722]  0000000000000286 000000001c661fb1 ffff880823037978
ffffffff814dac24
[233977.486723]  ffffffffc0741f58 ffffffffc0648a06 ffff8808230379f8
ffffffff81097221
[233977.486724]  ffffffffc07582b1 ffff880100000020 ffff880823037a08
ffff8808230379b0
[233977.486725] Call Trace:
[233977.486728]  [<ffffffff814dac24>] dump_stack+0x63/0x8f
[233977.486737]  [<ffffffffc0648a06>] ? skl_update_other_pipe_wm+0x406/0x420
[i915]
[233977.486739]  [<ffffffff81097221>] warn_slowpath_fmt+0xc1/0x160
[233977.486746]  [<ffffffffc0648a06>] skl_update_other_pipe_wm+0x406/0x420
[i915]
[233977.486753]  [<ffffffffc0648e20>] skl_update_wm+0x400/0x980 [i915]
[233977.486763]  [<ffffffffc06a7a0e>] ? gen9_write32+0x29e/0x4b0 [i915]
[233977.486770]  [<ffffffffc064df6e>] intel_update_watermarks+0x1e/0x20 [i915]
[233977.486781]  [<ffffffffc06d0451>] haswell_crtc_enable+0x311/0xa30 [i915]
[233977.486791]  [<ffffffffc06cc5ea>] intel_atomic_commit+0x7fa/0x1a60 [i915]
[233977.486818]  [<ffffffffc059fd6f>] ? drm_atomic_check_only+0x18f/0x600 [drm]
[233977.486824]  [<ffffffffc05a0217>] drm_atomic_commit+0x37/0x60 [drm]
[233977.486829]  [<ffffffffc0608c6d>]
drm_atomic_helper_connector_dpms+0xed/0x1a0 [drm_kms_helper]
[233977.486835]  [<ffffffffc058f014>]
drm_mode_connector_property_set_ioctl+0x394/0x3b0 [drm]
[233977.486840]  [<ffffffffc0578812>] drm_ioctl+0x152/0x540 [drm]
[233977.486846]  [<ffffffffc058ec80>] ?
drm_property_change_valid_put+0x180/0x180 [drm]
[233977.486848]  [<ffffffff812c2853>] do_vfs_ioctl+0xa3/0x610
[233977.486849]  [<ffffffff8104451d>] ? fpu__restore_sig+0x2d/0x40
[233977.486850]  [<ffffffff810354f0>] ? restore_sigcontext+0x140/0x1a0
[233977.486851]  [<ffffffff8103591f>] ? sys_rt_sigreturn+0xef/0x190
[233977.486852]  [<ffffffff812c2e39>] SyS_ioctl+0x79/0x90
[233977.486853]  [<ffffffff81a32776>] entry_SYSCALL_64_fastpath+0x1e/0xa8
[233977.486854] ---[ end trace d8d901b5e0b86a8a ]---

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