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Dump process stacktraces in case a test hangs

Submitted by Imre Deak

Assigned to Default DRI bug account

Link to original bug (#110619)

Description

Feature request (ideas from Chris) to help determining where a test gets stuck:

provide the stack traces off all existing processes (cat /proc/*/stack) in case of a timeout
ptrace all the child from the IGT runner and provide the trace in case of a timeout

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