The patch titled
lktdm: add support for hardlockup, softlockup and hung task crashes
has been added to the -mm tree. Its filename is
lktdm-bring-support-for-hardlockup-softlockup-and-hung-task-crashes.patch
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------------------------------------------------------
Subject: lktdm: add support for hardlockup, softlockup and hung task crashes
From: Frederic Weisbecker <fweisbec@xxxxxxxxx>
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@xxxxxxxxx>
Cc: Simon Kagstrom <simon.kagstrom@xxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Don Zickus <dzickus@xxxxxxxxxx>
Cc: Cyrill Gorcunov <gorcunov@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/misc/lkdtm.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff -puN drivers/misc/lkdtm.c~lktdm-bring-support-for-hardlockup-softlockup-and-hung-task-crashes drivers/misc/lkdtm.c
--- a/drivers/misc/lkdtm.c~lktdm-bring-support-for-hardlockup-softlockup-and-hung-task-crashes
+++ a/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 w
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;
_
Patches currently in -mm which might be from fweisbec@xxxxxxxxx are
origin.patch
linux-next.patch
lktdm-bring-support-for-hardlockup-softlockup-and-hung-task-crashes.patch
osst-update-ppos-instead-of-using-file-f_pos.patch
arch-cris-arch-v10-drivers-eepromc-eeprom_read-eeprom_write-should-update-ppos-instead-of-file-f_pos.patch
frv-remove-struct-file-argument-from-sysctl-proc_handler.patch
misdn-remove-unnecessary-test-on-f_pos.patch
rtc-m41t80-use-nonseekable_open.patch
vfs-introduce-noop_llseek.patch
osst-use-noop_llseek-instead-of-default_llseek.patch
st-use-noop_llseek-instead-of-default_llseek.patch
fs-do-not-fallback-to-default_llseek-when-readdir-uses-bkl.patch
documentation-filesystems-locking-update-documentation-on-llseek-wrt-bkl.patch
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