[Bug 103706] [CI][BAT] igt* incomplete - /dev/kmsg buffer overrun, some messages lost

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103706

--- Comment #12 from Marta Löfstedt <marta.lofstedt at intel.com> ---
https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_7090/fi-bxt-dsi/igt@vgem_basic@dmabuf-export.html

from dmesg, there is no pstore available.
ftrace "spamming" starts here:
<7>[  457.728243] [IGT] vgem_basic: executing
<0>[  471.342503] kms_psr_-4050    1..s1 444620858us : intel_lrc_irq_handler:
bcs0 out[0]: ctx=3.1, seqno=28d1b

then we get into a chain of BUG_ON backtraces:
<3>[  472.794818] BUG: sleeping function called from invalid context at
./include/linux/percpu-rwsem.h:34

<1>[  472.806539] BUG: unable to handle kernel paging request at
fffffffefaacf48a

<3>[  472.811672] BUG: scheduling while atomic: kworker/1:15/3965/0x00000003

<4>[  472.812493] WARNING: CPU: 1 PID: 3965 at kernel/rcu/tree_plugin.h:329
rcu_note_context_switch+0x70/0x6c0

<3>[  537.840247] INFO: rcu_preempt detected stalls on CPUs/tasks:
<3>[  537.840299]       Tasks blocked on level-0 rcu_node (CPUs 0-3): P3965
<3>[  537.840342]       (detected by 0, t=65002 jiffies, g=28545, c=28544,
q=29901)

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