On 18 Jul 2016, at 23:58, hch@xxxxxxxxxxxxx wrote:
On Mon, Jul 18, 2016 at 04:59:09AM +0000, Trond Myklebust wrote:
Actually... The problem might be that a previous attribute update is
marking the attribute cache as being revalidated. Does the following
patch help?
It doesn't. Also with your most recent linux-next branch the test
now cause the systems to OOM with or without your patch (with mine
it's
still fine). I tested with your writeback branch from about two or
three days ago before, and with that + your patch it also 'just fails'
and doesn't OOM. Looks like whatever causes the bug also creates
a temporarily memory leak when combined with recent changes from your
tree, most likely something from the pnfs branch.
I couldn't find the memory leak using kmemleak, but it OOMs pretty
quick. If I
insert an mdelay(200) just after the lookup_again: marker in
pnfs_update_layout() it doesn't OOM, but it seems stuck forever in a
loop on
that marker:
[ 1230.635586] pnfs_find_alloc_layout Begin ino=ffff88003ef986f8
layout=ffff8800392bca58
[ 1230.636729] pnfs_find_lseg:Begin
[ 1230.637538] pnfs_find_lseg:Return lseg (null) ref 0
[ 1230.638582] --> send_layoutget
[ 1230.639499] --> nfs4_proc_layoutget
[ 1230.640525] --> nfs4_layoutget_prepare
[ 1230.641479] --> nfs41_setup_sequence
[ 1230.641581] <-- nfs4_proc_layoutget status=-512
[ 1230.643288] --> nfs4_alloc_slot used_slots=0000
highest_used=4294967295 max_slots=31
[ 1230.644348] <-- nfs4_alloc_slot used_slots=0001 highest_used=0
slotid=0
[ 1230.645373] <-- nfs41_setup_sequence slotid=0 seqid=4376
[ 1230.646356] <-- nfs4_layoutget_prepare
[ 1230.647357] encode_sequence: sessionid=1468956665:2:3:0 seqid=4376
slotid=0 max_slotid=0 cache_this=0
[ 1230.648522] encode_layoutget: 1st type:0x5 iomode:2 off:122880
len:4096 mc:4096
[ 1230.650182] decode_layoutget roff:122880 rlen:4096 riomode:2,
lo_type:0x5, lo.len:48
[ 1230.651331] --> nfs4_layoutget_done
[ 1230.652233] --> nfs4_alloc_slot used_slots=0001 highest_used=0
max_slots=31
[ 1230.653409] <-- nfs4_alloc_slot used_slots=0003 highest_used=1
slotid=1
[ 1230.654547] nfs4_free_slot: slotid 1 highest_used_slotid 0
[ 1230.655606] nfs41_sequence_done: Error 0 free the slot
[ 1230.656635] nfs4_free_slot: slotid 0 highest_used_slotid 4294967295
[ 1230.657739] <-- nfs4_layoutget_done
[ 1230.658650] --> nfs4_layoutget_release
[ 1230.659626] <-- nfs4_layoutget_release
This debug output is identical for every cycle of the loop. Have to stop
for the
day.. more tomorrow.
Ben
--
To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
