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authorFrederic Weisbecker <fweisbec@gmail.com>2010-05-26 14:44:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-27 09:12:54 -0700
commita48223f9449d0289fc20cd11a98758109830798e (patch)
tree535341e185dc6a00bc037c4cbaed8cbe2b9b66c3
parent2a2a400f66e9e23eba960905c36dd37904bd9970 (diff)
downloadlinux-a48223f9449d0289fc20cd11a98758109830798e.tar.gz
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>
-rw-r--r--drivers/misc/lkdtm.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c
index 31a991161f0a..5bfb2a2041b8 100644
--- 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;