Commit a48223f9 authored May 26, 2010 by Frederic Weisbecker Committed by Linus Torvalds May 27, 2010

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>

parent 2a2a400f

drivers/misc/lkdtm.c

+20 −0

Original line number	Diff line number	Diff line
		@@ -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;

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