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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>
This commit is contained in:
Frederic Weisbecker 2010-05-26 14:44:29 -07:00 committed by Linus Torvalds
parent 2a2a400f66
commit a48223f944
1 changed files with 20 additions and 0 deletions
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20
drivers/misc/lkdtm.c
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@ -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;