lktdm: add support for hardlockup, softlockup and hung task crashes

This adds three new types of kernel "crashes" in the lkdtm driver to
trigger hardlockups, softlockups and task hung states at will.

The first two are useful to test the new generic lockup detector and check
its further regressions.  The latter one is a bonus to check the hung task
detector regressions even though it's not currently in rework.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Simon Kagstrom <simon.kagstrom@netinsight.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c
index 31a991161f0a0f984ab73354d1281ccf8aa4943b..5bfb2a2041b8a8f4854fbaf7351e8a1739ea5db0 100644 (file)
--- a/drivers/misc/lkdtm.c
+++ b/drivers/misc/lkdtm.c
@@ -75,6 +75,9 @@ enum ctype {
        UNALIGNED_LOAD_STORE_WRITE,
        OVERWRITE_ALLOCATION,
        WRITE_AFTER_FREE,
+       SOFTLOCKUP,
+       HARDLOCKUP,
+       HUNG_TASK,
 };
 
 static char* cp_name[] = {
@@ -99,6 +102,9 @@ static char* cp_type[] = {
        "UNALIGNED_LOAD_STORE_WRITE",
        "OVERWRITE_ALLOCATION",
        "WRITE_AFTER_FREE",
+       "SOFTLOCKUP",
+       "HARDLOCKUP",
+       "HUNG_TASK",
 };
 
 static struct jprobe lkdtm;
@@ -320,6 +326,20 @@ static void lkdtm_do_action(enum ctype which)
                memset(data, 0x78, len);
                break;
        }
+       case SOFTLOCKUP:
+               preempt_disable();
+               for (;;)
+                       cpu_relax();
+               break;
+       case HARDLOCKUP:
+               local_irq_disable();
+               for (;;)
+                       cpu_relax();
+               break;
+       case HUNG_TASK:
+               set_current_state(TASK_UNINTERRUPTIBLE);
+               schedule();
+               break;
        case NONE:
        default:
                break;