ftrace: system crash when changing current_tracer from function_graph via echo
Looks like you are not the only person to notice this behavior. I see
- https://lkml.org/lkml/2016/5/13/327
as a report of the problem, and
- https://lkml.org/lkml/2016/5/16/493
as a patch to the kernel that addresses it. Reading through that whole thread it appears that the issue is some compiler optimizations.
Unable to trace syscall via ftrace
If you haven't figured already
# egrep -i "^sys_read$|^sys_write$" tracing/available_filter_functions
SyS_read
SyS_write
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