selftests/ftrace: skip gcov symbols when picking a function to probe

kprobe_eventname.tc takes the last kallsyms entry whose name ends in
vfs_read and puts a probe on it. On a kernel built with
CONFIG_GCOV_PROFILE_ALL=y the counter symbol gcc emits for the function
sorts after it:

  ffffffff819bd1e0 T vfs_read
  ffffffff845013e0 t __gcov_.vfs_read

so the test picks __gcov_.vfs_read, which is not a function entry, and
the write fails:

  kprobe_eventname.tc: line 10: echo: write error: Invalid argument

Leave those symbols out of the choice. The test then picks vfs_read and
passes; without a coverage build nothing changes, as no such symbol
exists there.

This is the same class of problem as commit 23a4b108accc
("tracing/selftests: Fix kprobe event name test for .isra. functions"),
where a compiler-generated symbol was picked instead of a real function.

Link: https://lore.kernel.org/r/20260925133558.3636030-1-eva.kurchatova@virtuozzo.com
Signed-off-by: Eva Kurchatova <eva.kurchatova@virtuozzo.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions