3.18-stable review patch. If anyone has any objections, please let me know.
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From: Xiao Ni xni@redhat.com
[ Upstream commit 1d0ffd264204eba1861865560f1f7f7a92919384 ]
In raid10 reshape_request it gets max_sectors in read_balance. If the underlayer disks have bad blocks, the max_sectors is less than last. It will call goto read_more many times. It calls raise_barrier(conf, sectors_done != 0) every time. In this condition sectors_done is not 0. So the value passed to the argument force of raise_barrier is true.
In raise_barrier it checks conf->barrier when force is true. If force is true and conf->barrier is 0, it panic. In this case reshape_request submits bio to under layer disks. And in the callback function of the bio it calls lower_barrier. If the bio finishes before calling raise_barrier again, it can trigger the BUG_ON.
Add one pair of raise_barrier/lower_barrier to fix this bug.
Signed-off-by: Xiao Ni xni@redhat.com Suggested-by: Neil Brown neilb@suse.com Signed-off-by: Shaohua Li shli@fb.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/md/raid10.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -4423,11 +4423,12 @@ static sector_t reshape_request(struct m allow_barrier(conf); }
+ raise_barrier(conf, 0); read_more: /* Now schedule reads for blocks from sector_nr to last */ r10_bio = mempool_alloc(conf->r10buf_pool, GFP_NOIO); r10_bio->state = 0; - raise_barrier(conf, sectors_done != 0); + raise_barrier(conf, 1); atomic_set(&r10_bio->remaining, 0); r10_bio->mddev = mddev; r10_bio->sector = sector_nr; @@ -4532,6 +4533,8 @@ bio_full: if (sector_nr <= last) goto read_more;
+ lower_barrier(conf); + /* Now that we have done the whole section we can * update reshape_progress */