Hi,
In regards to the ltp-kdump issue where we see endless "loop hit"
messages,
NMI Watchdog detected LOCKUP on CPU 1
lkdtm : Crash point INT_HARDWARE_ENTRY of type LOOP hit
lkdtm : Crash point INT_HARDWARE_ENTRY of type LOOP hit
lkdtm : Crash point INT_HARDWARE_ENTRY of type LOOP hit
lkdtm : Crash point INT_HARDWARE_ENTRY of type LOOP hit
lkdtm : Crash point INT_HARDWARE_ENTRY of type LOOP hit
lkdtm : Crash point INT_HARDWARE_ENTRY of type LOOP hit
lkdtm : Crash point INT_HARDWARE_ENTRY of type LOOP hit
lkdtm : Crash point INT_HARDWARE_ENTRY of type LOOP hit
...
The following patch from Don Zickus will fix the issue. Not sure if it
is correct with regards to intention of the design, but nonetheless it
gets the test by.
The reason for the problem seems to stem from the fact there are lots of
irqs going on so when the test performs the correct NMI call, executing
crash_kexec takes forever because interrupts are still happening on
other cpus. The patch just squashes the printks once count falls below
zero.
This allows the code path to continue at an somewhat sane pace. I'm not
entirely sure why after 5 hours the kdump code couldn't execute (despite
the numerous printks for every interrupt).
Regards,
CQ
diff -u testcases/kdump/rhtools/lkdtm_mod/lkdtm.c.orig
testcases/kdump/rhtools/lkdtm_mod/lkdtm.c
--- testcases/kdump/rhtools/lkdtm_mod/lkdtm.c.orig 2007-10-30
15:04:15.000000000 +0800
+++ testcases/kdump/rhtools/lkdtm_mod/lkdtm.c 2007-10-30 15:06:44.000000000
+0800
@@ -235,6 +235,9 @@
void lkdtm_handler(void)
{
+ if (count < 0)
+ return;
+
printk(KERN_INFO "lkdtm : Crash point %s of type %s hit\n",
cpoint_name, cpoint_type);
--count;
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