selftests/coredump: add debug logging to test helpers

so we can easily figure out why something failed.

Link: https://patch.msgid.link/20251028-work-coredump-signal-v1-17-ca449b7b7aa0@kernel.org
Reviewed-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Christian Brauner 2025-10-28 09:46:02 +01:00
commit d5694db5dc
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