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55eb9a6c8b
The test_klp_callbacks_busy module conditionally blocks a future
livepatch transition by busy waiting inside its workqueue function,
busymod_work_func(). After scheduling this work, a test livepatch is
loaded, introducing the transition under test.
Both events are marked in the kernel log for later verification, but
there is no synchronization to ensure that busymod_work_func() logs its
function entry message before subsequent selftest commands log their own
messages. This can lead to a rare test failure due to unexpected
ordering like:
--- expected
+++ result
@@ -1,7 +1,7 @@
% modprobe test_klp_callbacks_busy block_transition=Y
test_klp_callbacks_busy: test_klp_callbacks_busy_init
-test_klp_callbacks_busy: busymod_work_func enter
% modprobe test_klp_callbacks_demo
+test_klp_callbacks_busy: busymod_work_func enter
livepatch: enabling patch 'test_klp_callbacks_demo'
livepatch: 'test_klp_callbacks_demo': initializing patching transition
test_klp_callbacks_demo: pre_patch_callback: vmlinux
Force the module init function to wait until busymod_work_func() has
started (and logged its message), before exiting to the next selftest
steps.
Fixes:
|
||
|---|---|---|
| .. | ||
| Makefile | ||
| test_klp_atomic_replace.c | ||
| test_klp_callbacks_busy.c | ||
| test_klp_callbacks_demo2.c | ||
| test_klp_callbacks_demo.c | ||
| test_klp_callbacks_mod.c | ||
| test_klp_livepatch.c | ||
| test_klp_shadow_vars.c | ||
| test_klp_state2.c | ||
| test_klp_state3.c | ||
| test_klp_state.c | ||