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

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 { ...@@ -75,6 +75,9 @@ enum ctype {
UNALIGNED_LOAD_STORE_WRITE, UNALIGNED_LOAD_STORE_WRITE,
OVERWRITE_ALLOCATION, OVERWRITE_ALLOCATION,
WRITE_AFTER_FREE, WRITE_AFTER_FREE,
SOFTLOCKUP,
HARDLOCKUP,
HUNG_TASK,
}; };
static char* cp_name[] = { static char* cp_name[] = {
...@@ -99,6 +102,9 @@ static char* cp_type[] = { ...@@ -99,6 +102,9 @@ static char* cp_type[] = {
"UNALIGNED_LOAD_STORE_WRITE", "UNALIGNED_LOAD_STORE_WRITE",
"OVERWRITE_ALLOCATION", "OVERWRITE_ALLOCATION",
"WRITE_AFTER_FREE", "WRITE_AFTER_FREE",
"SOFTLOCKUP",
"HARDLOCKUP",
"HUNG_TASK",
}; };
static struct jprobe lkdtm; static struct jprobe lkdtm;
...@@ -320,6 +326,20 @@ static void lkdtm_do_action(enum ctype which) ...@@ -320,6 +326,20 @@ static void lkdtm_do_action(enum ctype which)
memset(data, 0x78, len); memset(data, 0x78, len);
break; 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: case NONE:
default: default:
break; break;
......
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