[Bug 105086] [BAT] [CNL only] igt@* - incomplete - system hang?

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105086

--- Comment #15 from Marta Löfstedt <marta.lofstedt at intel.com> ---
https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_4/fi-cnl-y3/igt@kms_atomic_transition@plane-all-modeset-transition.html

run.log:
running: igt/kms_atomic_transition/plane-all-modeset-transition

[29/97] skip: 11, pass: 16, fail: 2 /                          
FATAL: command execution failed
...
Completed CI_IGT_test drmtip_4/fi-cnl-y3/7 : FAILURE
CI_IGT_test runtime 556 seconds
Rebooting fi-cnl-y3

dmesg:
<7>[  136.865074] [IGT] kms_atomic_transition: starting subtest
plane-all-modeset-transition
...
<7>[  307.183896] [drm:intel_enable_shared_dpll [i915]] enable DPLL 0 (active
4, on? 0) for crtc 99
<7>[  307.184048] [drm:intel_enable_shared_dpll [i915]] enabling DPLL 0
<7>[  307.184538] [drm:intel_dp_dual_mode_set_tmds_output [i915]] Enabling DP
dual mode adaptor TMDS output

pstore is missing beader of back trace however, the stuff there indicates some
CPU scheduling issue:

<4>[  326.290574] Call Trace:
<4>[  326.290584]  ? do_idle+0x188/0x1d0
<4>[  326.290591]  ? cpu_startup_entry+0x14/0x20
<4>[  326.290597]  ? start_secondary+0x129/0x160
<4>[  326.290603]  ? secondary_startup_64+0xa5/0xb0
...
<1>[  326.290711] RIP: acpi_idle_enter+0x103/0x290 RSP: ffff9965800ffeb0
<4>[  326.290717] ---[ end trace 5cba7989ef49428d ]---
<0>[  326.588085] Kernel panic - not syncing: Attempted to kill the idle task!
<4>[  326.588097] ------------[ cut here ]------------
<4>[  326.588100] sched: Unexpected reschedule of offline CPU#3!

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