[Drbd-dev] DRBD: ASSERT in drbd_actlog.c:259
lars.ellenberg at linbit.com
Mon Nov 14 11:11:09 CET 2016
On Fri, Nov 11, 2016 at 06:45:18PM +0100, Wolfgang Walter wrote:
> when I execute
> mkfs.ext4 -J device=UUID=625d871f-c278-4acb-916d-774dc78dbd8a -v -b 4096 -E stride=$((512/4)),stripe_width=$((512/4*3)),lazy_itable_init=0 -O inline_data,mmp -L dyn -m .01 /dev/test/big
> the command hangs
It should not hang, really, but it is probably too busy spewing below
message to the console over and over again.
There have been some problems with our trim/discard handling in some situations.
That's also why this does not happen if you say nodiscard.
> and the kernel (4.4.30) complains:
> block drbd1: ASSERT( (unsigned)(last - first) <= 1 ) in drivers/block/drbd/drbd_actlog.c:259
Author: Lars Ellenberg <lars.ellenberg at linbit.com>
Date: Tue Jun 14 00:26:23 2016 +0200
drbd: allow larger max_discard_sectors
Make sure we have at least 67 (> AL_UPDATES_PER_TRANSACTION)
al-extents available, and allow up to half of that to be
discarded in one bio.
Signed-off-by: Philipp Reisner <philipp.reisner at linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg at linbit.com>
Signed-off-by: Jens Axboe <axboe at fb.com>
diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index d524973..265b2b6 100644
@@ -258,7 +258,7 @@ bool drbd_al_begin_io_fastpath(struct drbd_device *device, struct drbd_interval
unsigned first = i->sector >> (AL_EXTENT_SHIFT-9);
unsigned last = i->size == 0 ? first : (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9);
- D_ASSERT(device, (unsigned)(last - first) <= 1);
+ D_ASSERT(device, first <= last);
D_ASSERT(device, atomic_read(&device->local_cnt) > 0);
/* FIXME figure out a fast path for bios crossing AL extent boundaries */
and some more chunks, but you should not cherry-pick stuff "just so",
if it may change semantics ...
kernel v4.4 is roughly equivalent to out-of-tree drbd 8.4.5,
we are at 8.4.9 meanwhile, so you may want to try that as well.
: Lars Ellenberg
: LINBIT | Keeping the Digital World Running
: DRBD -- Heartbeat -- Corosync -- Pacemaker
: R&D, Integration, Ops, Consulting, Support
DRBD® and LINBIT® are registered trademarks of LINBIT
More information about the drbd-dev