On Wednesday March 13, gody@master.slon.net wrote:
> On Wed, 13 Mar 2002, Neil Brown wrote:
>
> > Could you tell me exactly what happened?
>
> cat /proc/mdstat stalls in D state. Can't be interrupted.
>
Ok, I think I have it.
Any call to MD_BUG would try to claim some semaphores, but if they
were already claim..... things freeze up.
MD_BUG is called in a number of situations that aren't really bugs,
like when you try to remove an active (i.e. not failed) drive from an
array.
It could be that you were hitting a benign BUG message and this was
deadlocking.
Please apply the following patch (which just removes lock from MD_BUG)
and try again. Thanks.
NeilBrown
--- ./drivers/md/md.c 2002/03/14 00:37:07 1.2
+++ ./drivers/md/md.c 2002/03/14 00:37:19
@@ -872,8 +872,8 @@
printk("md: **********************************\n");
printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
printk("md: **********************************\n");
- down(&all_mddevs_sem);
- ITERATE_MDDEV_LOCK(mddev,tmp) {
+/* down(&all_mddevs_sem); */
+ ITERATE_MDDEV/*_LOCK*/(mddev,tmp) {
printk("md%d: ", mdidx(mddev));
ITERATE_RDEV(mddev,rdev,tmp2)
@@ -888,7 +888,7 @@
ITERATE_RDEV(mddev,rdev,tmp2)
print_rdev(rdev);
}
- up(&all_mddevs_sem);
+/* up(&all_mddevs_sem); */
printk("md: **********************************\n");
printk("\n");
}
-
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