[Bug 109097] [CI][SHARDS] igt at debugfs_test@read_all_entries_display_on - incomplete - Reading file "i915_dsc_fec_support"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109097

--- Comment #2 from James Ausmus <james.ausmus at intel.com> ---
Wonder if it's a locking issue?

Maybe also related:
http://gfx-ci.fi.intel.com/tree/drm-tip/CI_DRM_5332/shard-iclb4/igt@i915_suspend@debugfs-reader.html


<6> [374.267844] Freezing user space processes ... 
<7> [376.166282] [drm:edp_panel_vdd_off_sync [i915]] Turning eDP port A VDD off
<7> [376.166429] [drm:edp_panel_vdd_off_sync [i915]] PP_STATUS: 0x80000008
PP_CONTROL: 0x00000067
<7> [376.166455] [drm:intel_power_well_disable [i915]] disabling DC off
<7> [376.166483] [drm:skl_enable_dc6 [i915]] Enabling DC6
<7> [376.166507] [drm:gen9_set_dc_state [i915]] Setting DC state from 00 to 02
<3> [394.273585] Freezing of tasks failed after 20.005 seconds (1 tasks
refusing to freeze, wq_busy=0):
<6> [394.273668] cat             R  running task    13688  1183   1182
0x00000004
<4> [394.273684] Call Trace:
<4> [394.273691]  ? trace_hardirqs_on_thunk+0x1a/0x1c
<4> [394.273695]  ? lockdep_hardirqs_on+0xe0/0x1b0
<4> [394.273698]  ? trace_hardirqs_on_thunk+0x1a/0x1c
<4> [394.273705]  ? retint_kernel+0x2d/0x2d
<4> [394.273712]  ? __lock_is_held+0x6b/0xb0
<4> [394.273720]  ? ___might_sleep+0x18c/0x250
<4> [394.273726]  ? __ww_mutex_lock.constprop.6+0x56/0xfd0
<4> [394.273729]  ? trace_hardirqs_on_thunk+0x1a/0x1c
<4> [394.273733]  ? __lock_is_held+0x6b/0xb0
<4> [394.273743]  ? ww_mutex_lock_interruptible+0x39/0xa0
<4> [394.273747]  ? ww_mutex_lock_interruptible+0x39/0xa0
<4> [394.273751]  ? drm_modeset_lock+0x3b/0x110
<4> [394.273784]  ? i915_dsc_fec_support_show+0x97/0x1e0 [i915]
<4> [394.273796]  ? seq_read+0xdb/0x3c0
<4> [394.273803]  ? full_proxy_read+0x52/0x90
<4> [394.273809]  ? __vfs_read+0x31/0x170
<4> [394.273815]  ? __se_sys_newfstat+0x3c/0x60
<4> [394.273820]  ? vfs_read+0x9e/0x140
<4> [394.273825]  ? ksys_read+0x50/0xc0
<4> [394.273830]  ? do_syscall_64+0x55/0x190
<4> [394.273834]  ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
<6> [394.273845] OOM killer enabled.
<6> [394.273847] Restarting tasks ... done.
<6> [394.287078] PM: suspend exit
<6> [394.298682] [IGT] i915_suspend: exiting, ret=99

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