[PATCH v2 blktests 1/2] common/rc: add _have_debugfs()

[PATCH v2 blktests 1/2] common/rc: add _have_debugfs()

[Sebastian Chlad]

Kernel options like FAULT_INJECTION_DEBUG_FS being enabled does not
guarantee debugfs is actually mounted at /sys/kernel/debug: on
systemd systems, sys-kernel-debug.mount may not be started by
default (e.g. SLE).

Add _have_debugfs(), mirroring the existing _have_configfs() and
_have_tracefs() checks, so tests that depend on debugfs-backed
interfaces can skip cleanly with a clear reason instead of failing.

Signed-off-by: Sebastian Chlad <sebastian.chlad@suse.com>
---
 common/rc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/common/rc b/common/rc
index d60a125..de5eb6d 100644
--- a/common/rc
+++ b/common/rc
@@ -223,6 +223,14 @@ _have_configfs() {
 	return 0
 }
 
+_have_debugfs() {
+	if ! findmnt -t debugfs /sys/kernel/debug >/dev/null; then
+		SKIP_REASONS+=("debugfs is not mounted at /sys/kernel/debug")
+		return 1
+	fi
+	return 0
+}
+
 # Check if the specified kernel config files are available.
 _have_kernel_config_file() {
 	if [[ ! -f /proc/config.gz && ! -f /boot/config-$(uname -r) ]]; then
-- 
2.51.0

[PATCH blktests v2 2/2] nvme/039: skip cleanly when debugfs is not mounted

[Sebastian Chlad]

_nvme_err_inject_setup() reads/writes files under
/sys/kernel/debug/<dev>/fault_inject/, which don't exist if debugfs
isn't mounted even though FAULT_INJECTION_DEBUG_FS is enabled in the
kernel config (e.g. SLE, where sys-kernel-debug.mount isn't started
by default).

Call _have_debugfs() from requires() to skip cleanly instead.

Signed-off-by: Sebastian Chlad <sebastian.chlad@suse.com>
---
 tests/nvme/039 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/nvme/039 b/tests/nvme/039
index 8c70c5c..b634008 100755
--- a/tests/nvme/039
+++ b/tests/nvme/039
@@ -15,6 +15,7 @@ QUICK=1
 requires() {
 	_have_program nvme
 	_have_kernel_options FAULT_INJECTION FAULT_INJECTION_DEBUG_FS
+	_have_debugfs
 }
 
 device_requires() {
-- 
2.51.0

Re: [PATCH v2 blktests 1/2] common/rc: add _have_debugfs()

[Shin'ichiro Kawasaki]

On Jul 16, 2026 / 12:08, Sebastian Chlad wrote:
> Kernel options like FAULT_INJECTION_DEBUG_FS being enabled does not
> guarantee debugfs is actually mounted at /sys/kernel/debug: on
> systemd systems, sys-kernel-debug.mount may not be started by
> default (e.g. SLE).
> 
> Add _have_debugfs(), mirroring the existing _have_configfs() and
> _have_tracefs() checks, so tests that depend on debugfs-backed
> interfaces can skip cleanly with a clear reason instead of failing.
> 
> Signed-off-by: Sebastian Chlad <sebastian.chlad@suse.com>

Thanks for the fix! I applied this series. Of note is that I added one more
commit for nvme/050 that has the same problem as nvme/039.