Commit a48223f9 authored by Frederic Weisbecker's avatar Frederic Weisbecker Committed by Linus Torvalds
Browse files

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: default avatarFrederic 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2a2a400f
......@@ -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;
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment