Messages in this thread Patch in this message | | | From | Neil Brown <> | Date | Fri, 8 Dec 2006 12:31:41 +1100 | Subject | Re: 2.6.19-rc6-mm2 |
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On Tuesday December 5, jikos@jikos.cz wrote: > On Tue, 5 Dec 2006, Jiri Kosina wrote: > > > It seemed to be 100% reproducible - happened on every boot of FC6 > > system, so it was probably triggered by some raid/lvm command executed > > from init scripts after boot, but I didn't examine it further. As soon > > as I get to the machine where this happens, I will try to narrow it down > > to the exact userspace command that triggers it and will let you know > > (probably this evening). > > OK, so more details follow (I am not sure how valuable they are, though).
They do help a bit..
I've found a possible race that could possibly be related to this BUG. Can you try this patch and see if it helps?
Note: this isn't the final form I would use to fix the race, but if it makes a difference, then it tells me I am on the right track.
Thanks, NeilBrown
Signed-off-by: Neil Brown <neilb@suse.de>
### Diffstat output ./drivers/md/md.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff .prev/drivers/md/md.c ./drivers/md/md.c --- .prev/drivers/md/md.c 2006-12-06 14:49:20.000000000 +1100 +++ ./drivers/md/md.c 2006-12-07 10:29:40.000000000 +1100 @@ -222,10 +222,14 @@ static inline mddev_t *mddev_get(mddev_t return mddev; } +static DEFINE_MUTEX(disks_mutex); static void mddev_put(mddev_t *mddev) { - if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) + mutex_lock(&disks_mutex); + if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) { + mutex_unlock(&disks_mutex); return; + } list_del(&mddev->all_mddevs); spin_unlock(&all_mddevs_lock); @@ -234,6 +238,7 @@ static void mddev_put(mddev_t *mddev) blk_cleanup_queue(mddev->queue); mddev->queue = NULL; kobject_unregister(&mddev->kobj); + mutex_unlock(&disks_mutex); } static mddev_t * mddev_find(dev_t unit) @@ -2948,7 +2953,6 @@ int mdp_major = 0; static struct kobject *md_probe(dev_t dev, int *part, void *data) { - static DEFINE_MUTEX(disks_mutex); mddev_t *mddev = mddev_find(dev); struct gendisk *disk; int partitioned = (MAJOR(dev) != MD_MAJOR); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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