ubuntu_kernel_selftests:ftrace: ftrace - function graph filters with stack tracer [FAIL]

[Stefan Bader]

This is one of the ftrace tests failing with focal:linux-hwe-5.13 on scobee-kernel(arm64) for sru-20211018. Some of these are known to fail at random. Just cannot recall having seen this one before.

04:54:05 DEBUG| [stdout] # [18] event tracing - enable/disable with top level files [PASS]
04:54:07 DEBUG| [stdout] # [19] Test trace_printk from module [PASS]
05:03:39 DEBUG| [stdout] # [20] ftrace - function graph filters with stack tracer [FAIL]