RE: segfault in bluestore during random writes

[Somnath Roy <Somnath.Roy@sandisk.com>]

Will do that , run some test and send out a PR..

Thanks & Regards
Somnath

-----Original Message-----
From: Sage Weil [mailto:sweil@redhat.com] 
Sent: Thursday, July 07, 2016 2:05 PM
To: Somnath Roy
Cc: Igor Fedotov; Varada Kari; Ma, Jianpeng; Mark Nelson; ceph-devel
Subject: RE: segfault in bluestore during random writes

On Thu, 7 Jul 2016, Somnath Roy wrote:
> Just for analogy, in filestore ::_do_op we do carry out transactions (_do_transactions) within osr->lock()....
> 
> << Hmm, I think perhaps everything in submit_transaction after the osr 
> is identified should be protected by the osr lock
> 
> Submit_transaction or you meant Bluestore::queue_transaction() ?
> 

queue_transaction, sorry!  Probably take the lock at the // prepare line.

sage

> Thanks & Regards
> Somnath
> 
> -----Original Message-----
> From: Sage Weil [mailto:sweil@redhat.com]
> Sent: Thursday, July 07, 2016 1:22 PM
> To: Somnath Roy
> Cc: Igor Fedotov; Varada Kari; Ma, Jianpeng; Mark Nelson; ceph-devel
> Subject: RE: segfault in bluestore during random writes
> 
> On Thu, 7 Jul 2016, Somnath Roy wrote:
> > Sage/Igor/Varada,
> > Shouldn't we guard _txc_add_transaction with osr->qlock as well , this resolved the issue for me..I don't think it will add any extra cost as ops within sequencer anyway is serialized.
> > 
> >   for (vector<Transaction>::iterator p = tls.begin(); p != tls.end(); ++p) {
> >     (*p).set_osr(osr);
> >     txc->ops += (*p).get_num_ops();
> >     txc->bytes += (*p).get_num_bytes();
> >     std::lock_guard<std::mutex> l(osr->qlock);
> >     _txc_add_transaction(txc, &(*p));
> >   }
> 
> Hmm, I think perhaps everything in submit_transaction after the osr is identified should be protected by the osr lock.
> 
> sage
> 
> > 
> > Thanks & Regards
> > Somnath
> > 
> > -----Original Message-----
> > From: Sage Weil [mailto:sweil@redhat.com]
> > Sent: Thursday, July 07, 2016 8:00 AM
> > To: Igor Fedotov
> > Cc: Varada Kari; Ma, Jianpeng; Somnath Roy; Mark Nelson; ceph-devel
> > Subject: Re: segfault in bluestore during random writes
> > 
> > On Thu, 7 Jul 2016, Igor Fedotov wrote:
> > > Varada,
> > >
> > > originally I was thinking about introduction additional container 
> > > for dirty Blobs for a transaction. By using smart pointers to Blob 
> > > class instances one can easily implement this. But it appeared 
> > > that we don't use such pointers for Blobs in other places hence 
> > > it's not that easy to introduce. And probably additional lock is 
> > > good enough solution in the current code. Will think about that a bit more though. Or let's wait for comments from Sage.
> > 
> > Your diagnosis is right... I was thinking the cache->lock covered this but it doesn't protect us while we enumerate the Blobs.
> > 
> > I think the best way to solve this is probably to fix
> > 
> >       // FIXME: use a per-txc dirty blob list?
> > 
> > at the same time, and to make Blob refcounted.  Take a reference to Blob when it is part of the BlobMap intrusive set, and take another when it is on the txc writing list(/vector).  That we we don't need a new lock *and* we avoid traversing the entire blob_map looking for blob buffers to mark clean.
> > 
> > > BTW probably I missed something but I can't find the location 
> > > where Blob instance is released now for out case (i.e. when it's 
> > > erased from the blob map).  The only release location I found is 
> > > at BlobMap::_clear but it doesn't cover our case IMHO. Any ideas? Or we have some mem leak here?
> > 
> > Yeah I think it's a leak.  Probably need a delete b (or rather, b->put(), if we make Blob a RefCountedObject) in _wctx_finish.
> > 
> > sage
> > 
> > >
> > >
> > >
> > > On 07.07.2016 16:30, Varada Kari wrote:
> > > > Hi Igor,
> > > >
> > > > I also have the similar fix. Haven't tested yet completely.
> > > > When i checked the blob id in the failed case, it was zero all the time.
> > > > That verifies the same theory what you have.
> > > >
> > > > But i am wondering, how can we eliminate the lock here? we still 
> > > > need to have the lock when reading the blob_map entries and we 
> > > > have to maintain the order while making the changes to blob_map.
> > > > please correct me i have understood wrongly.
> > > >
> > > > Varada
> > > >
> > > > On Thursday 07 July 2016 06:44 PM, Igor Fedotov wrote:
> > > > > Below is the patch that seems to fix the issue.
> > > > >
> > > > > The root cause IMO is a conflict between blob map removal at 
> > > > > _wctx_finish and enumerating over the same blob_map performed 
> > > > > at io completion (_txt_state_proc).
> > > > >
> > > > > The case occurs when the first transaction did the async write 
> > > > > to some blob and subsequent transaction overwrite this blob. 
> > > > > As a result transaction 1 IO completion may interfere with 
> > > > > write finish processing for the second one - trans 1 updates 
> > > > > buffer cache and enumerates dirty blobs while trans 2 erases overwritten blob.
> > > > >
> > > > >
> > > > > This patch isn't  a final fix, it's rather a way to confirm 
> > > > > that the root cause is correct.
> > > > >
> > > > > Works for me but I'd like someone else to verify it fixes the issue too.
> > > > >
> > > > > Proper fix should probably refactor the code and introduce 
> > > > > additional container for dirty blobs as suggested by the FIXME at _txt_state_proc.
> > > > >
> > > > >
> > > > > diff --git a/src/os/bluestore/BlueStore.cc 
> > > > > b/src/os/bluestore/BlueStore.cc
> > > > >
> > > > > index 823ec14..8571e17 100644
> > > > > --- a/src/os/bluestore/BlueStore.cc
> > > > > +++ b/src/os/bluestore/BlueStore.cc
> > > > > @@ -4618,6 +4618,7 @@ void BlueStore::_txc_state_proc(TransContext *txc)
> > > > >          txc->state = TransContext::STATE_KV_QUEUED;
> > > > >          // FIXME: use a per-txc dirty blob list?
> > > > >          for (auto& o : txc->onodes) {
> > > > > +    std::unique_lock<std::mutex> lck(o->blobmap_lock);
> > > > >        for (auto& p : o->blob_map.blob_map) {
> > > > >          p.bc.finish_write(txc->seq);
> > > > >        }
> > > > > @@ -6137,6 +6138,7 @@ void BlueStore::_wctx_finish(
> > > > >          dout(20) << __func__ << " rm blob " << *b << dendl;
> > > > >          txc->statfs_delta.compressed() -=
> > > > > b->blob.get_compressed_payload_length();
> > > > >          if (l.blob >= 0) {
> > > > > +    std::unique_lock<std::mutex> lck(o->blobmap_lock);
> > > > >        o->blob_map.erase(b);
> > > > >          } else {
> > > > >        o->bnode->blob_map.erase(b); diff --git 
> > > > > a/src/os/bluestore/BlueStore.h b/src/os/bluestore/BlueStore.h 
> > > > > index f380cc9..7493f18 100644
> > > > > --- a/src/os/bluestore/BlueStore.h
> > > > > +++ b/src/os/bluestore/BlueStore.h
> > > > > @@ -482,6 +482,8 @@ public:
> > > > >        BlobMap blob_map;       ///< local blobs (this onode onode)
> > > > >
> > > > >        std::mutex flush_lock;  ///< protect flush_txns
> > > > > +    std::mutex blobmap_lock;
> > > > > +
> > > > >        std::condition_variable flush_cond;   ///< wait here for unapplied
> > > > > txns
> > > > >        set<TransContext*> flush_txns;   ///< committing or wal txns
> > > > >
> > > > >
> > > > >
> > > > > On 07.07.2016 11:30, Varada Kari wrote:
> > > > > > One more observation on the same lines as Ma Jianpeng,
> > > > > >
> > > > > > For the same onode i see 17 references and 16 flushing_txns. 
> > > > > > I think we are getting parallel txns running on the same object.
> > > > > > (gdb) p *(o.px)
> > > > > > $8 = {
> > > > > >     nref = {
> > > > > >       _M_i = 17
> > > > > >     },
> > > > > >     oid = {
> > > > > >       hobj = {
> > > > > >         oid = {
> > > > > >           name = "rbd_data.100f6b8b4567.", '0' <repeats 14 times>, "1d"
> > > > > > ...
> > > > > > flush_txns = std::set with 16 elements = {
> > > > > >       [0] = 0x7fdbbcb73980,
> > > > > >       [1] = 0x7fdbe7dd3400,
> > > > > >       [2] = 0x7fdbe7dd3900,
> > > > > >       [3] = 0x7fdbf7c3cd00,
> > > > > >       [4] = 0x7fdc00f46280,
> > > > > >       [5] = 0x7fdc00f46c80,
> > > > > >       [6] = 0x7fdc00f47900,
> > > > > >       [7] = 0x7fdc00f48080,
> > > > > >       [8] = 0x7fdc00f48300,
> > > > > >       [9] = 0x7fdc00f48800,
> > > > > >       [10] = 0x7fdc00f49200,
> > > > > >       [11] = 0x7fdc00f49700,
> > > > > >       [12] = 0x7fdc09a63680,
> > > > > >       [13] = 0x7fdc0ca11e00,
> > > > > >       [14] = 0x7fdc0ca12a80,
> > > > > >       [15] = 0x7fdc12c2f480
> > > > > >
> > > > > > I have written my object with 8K before and overwriting with 
> > > > > > 64k now, which is showing this behavior.
> > > > > > But does allowing parallel writes harm if they are writing 
> > > > > > to different offset and length and guarantee the order? we 
> > > > > > can check the overlap and not allow write if they have a 
> > > > > > overlap, else we are okay to run parallel writes to the object.
> > > > > > In this case we are missing some locking while updating the blob_map.
> > > > > > Still not able to figure of the exact location.
> > > > > >
> > > > > > Varada
> > > > > >
> > > > > >
> > > > > > On Thursday 07 July 2016 01:23 PM, Ma, Jianpeng wrote:
> > > > > > > I add some debug messges  and the message as followings 
> > > > > > > when bug
> > > > > > > reproduce:
> > > > > > >
> > > > > > > 3305972   -102> 2016-07-07 23:48:12.541535 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) queue_transactions 
> > > > > > > existing
> > > > > > > 0xac78760 osr(0.4f 0xb6d2d80)
> > > > > > > 3305973   -101> 2016-07-07 23:48:12.541548 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_create osr
> > > > > > > 0xac78760 =
> > > > > > > 0x177b0000 seq 611
> > > > > > > 3305974   -100> 2016-07-07 23:48:12.541563 7f7f4449c700 15
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _write 0.4f_head 
> > > > > > > #0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head#
> > > > > > > 0x1a0000~10000
> > > > > > > 3305975    -99> 2016-07-07 23:48:12.541574 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _do_write 
> > > > > > > #0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head#
> > > > > > > 0x1a0000~10000 - have 0x400000 (4194304) bytes         in 64 lextents
> > > > > > > 3305976    -98> 2016-07-07 23:48:12.541581 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _do_write prefer 
> > > > > > > csum_order 12 comp_blob_size 0x40000
> > > > > > > 3305977    -97> 2016-07-07 23:48:12.541608 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _do_write_big
> > > > > > > 0x1a0000~10000 max_blob_len 0x10000 compress 0
> > > > > > > 3305978    -96> 2016-07-07 23:48:12.541617 7f7f4449c700 20
> > > > > > > bluestore.BufferSpace(0x12012ea8 in 0xa02f240) _discard 0x0~10000
> > > > > > > 3305979    -95> 2016-07-07 23:48:12.541626 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _do_write_big  lex 0x1a0000:
> > > > > > > 0x0~10000->91
> > > > > > > 3305980    -94> 2016-07-07 23:48:12.541630 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _do_write_big  blob 
> > > > > > > 91:blob([] clen 0x0 ref_map(0x0~10000=1))
> > > > > > > 3305981    -93> 2016-07-07 23:48:12.541634 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _do_alloc_write txc
> > > > > > > 0x177b0000 1 blobs
> > > > > > > 3305982    -92> 2016-07-07 23:48:12.541638 7f7f4449c700 10
> > > > > > > bitmapalloc:reserve instance 174395776 num_used 1600847 total 18350080
> > > > > > > 3305983    -91> 2016-07-07 23:48:12.541641 7f7f4449c700 10
> > > > > > > bitmapalloc:allocate instance 174395776 want_size 0x10000 
> > > > > > > alloc_unit
> > > > > > > 0x1000 hint 0x0
> > > > > > > 3305984    -90> 2016-07-07 23:48:12.541642 7f7f55cbf700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_state_proc txc
> > > > > > > 0xedfef00 aio_wait
> > > > > > > 3305985    -89> 2016-07-07 23:48:12.541651 7f7f55cbf700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_finish_io 0xedfef00
> > > > > > > 3305986    -88> 2016-07-07 23:48:12.541653 7f7f55cbf700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_state_proc txc
> > > > > > > 0xedfef00 io_done
> > > > > > > 3305987    -87> 2016-07-07 23:48:12.541656 7f7f55cbf700  0
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_state_procIO_DONE 
> > > > > > > txc
> > > > > > > 0xedfef00
> > > > > > > 3305988    -86> 2016-07-07 23:48:12.541659 7f7f55cbf700  0
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_state_proc onode 
> > > > > > > #0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head# 0 size=65
> > > > > > > 3305989    -85> 2016-07-07 23:48:12.541674 7f7f55cbf700 20
> > > > > > > bluestore.BufferSpace(0x12012548 in 0xa02f240) 
> > > > > > > finish_write
> > > > > > > buffer(0x177d7480 space 0x12012548 0x0~10000 writing nocache)
> > > > > > > 3305990    -84> 2016-07-07 23:48:12.541680 7f7f55cbf700 20
> > > > > > > bluestore.BufferSpace(0x12012ea8 in 0xa02f240) 
> > > > > > > finish_write
> > > > > > > buffer(0x177d75c0 space 0x12012ea8 0x0~10000 writing nocache)
> > > > > > > 3305991    -83> 2016-07-07 23:48:12.541684 7f7f55cbf700  0
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_state_proc 2
> > > > > > > 3305992    -82> 2016-07-07 23:48:12.541715 7f7f4ccad700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _kv_sync_thread wake
> > > > > > > 3305993    -81> 2016-07-07 23:48:12.541742 7f7f4ccad700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _kv_sync_thread 
> > > > > > > committing
> > > > > > > 1 cleaning 0
> > > > > > > 3305994    -80> 2016-07-07 23:48:12.541747 7f7f4ccad700 10
> > > > > > > bitmapalloc:commit_start instance 174395776 releasing 
> > > > > > > 65536 in extents
> > > > > > > 1
> > > > > > > 3305995    -79> 2016-07-07 23:48:12.541752 7f7f4449c700 20
> > > > > > > bitmapalloc:allocate instance 174395776 offset 0xc0520000 
> > > > > > > length
> > > > > > > 0x10000
> > > > > > > 3305996    -78> 2016-07-07 23:48:12.541757 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _do_alloc_write blob 
> > > > > > > 91:blob([0xc0520000~10000] clen 0x0 mutable ref_map(0x0~10000=1))
> > > > > > > csum_order 12 csum_length 0x        10000
> > > > > > > 3305997    -77> 2016-07-07 23:48:12.541784 7f7f4449c700  0
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _wctx_finish onode 
> > > > > > > #0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head#
> > > > > > > 3305998    -76> 2016-07-07 23:48:12.541795 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _wctx_finish lex_old 
> > > > > > > [0x0~10000->27]
> > > > > > > 3305999    -75> 2016-07-07 23:48:12.541801 7f7f4449c700 20
> > > > > > > bluestore.BufferSpace(0xd2c7c98 in 0xa02f240) _discard 0x0~10000
> > > > > > > 3306000    -74> 2016-07-07 23:48:12.541804 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _wctx_finish release
> > > > > > > 0xc06d0000~10000
> > > > > > > 3306001    -73> 2016-07-07 23:48:12.541807 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _wctx_finish rm blob 
> > > > > > > 27:blob([!~10000] clen 0x0 mutable+csum crc32c/0x1000)
> > > > > > > 3306002    -72> 2016-07-07 23:48:12.541818 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _write 0.4f_head 
> > > > > > > #0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head#
> > > > > > > 0x1a0000~10000 = 0
> > > > > > > 3306003    -71> 2016-07-07 23:48:12.541829 7f7f4449c700 15
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _setattrs 0.4f_head 
> > > > > > > #0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head# 2 keys
> > > > > > > 3306004    -70> 2016-07-07 23:48:12.541836 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _setattrs 0.4f_head 
> > > > > > > #0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head# 2 keys = 0
> > > > > > > 3306005    -69> 2016-07-07 23:48:12.541844 7f7f4449c700 15
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _omap_setkeys 
> > > > > > > 0.4f_head #0:f2000000::::head#
> > > > > > > 3306006    -68> 2016-07-07 23:48:12.541856 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _omap_setkeys 
> > > > > > > 0.4f_head #0:f2000000::::head# = 0
> > > > > > > 3306007    -67> 2016-07-07 23:48:12.541855 7f7f4ccad700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_finalize_kv txc
> > > > > > > 0xedfef00 allocated 0x[c0510000~10000] released 0x[c06c0000~10000]
> > > > > > > 3306008    -66> 2016-07-07 23:48:12.541863 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_write_nodes txc
> > > > > > > 0x177b0000 onodes 0xa662000 bnodes
> > > > > > > 3306009    -65> 2016-07-07 23:48:12.541864 7f7f4ccad700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_finalize_kv 
> > > > > > > overlap 0x[], new allocated 0x[c0510000~10000] released 0x[c06c0000~10000]
> > > > > > > 3306010    -64> 2016-07-07 23:48:12.541868 7f7f4ccad700 10 freelist
> > > > > > > allocate 0xc0510000~10000
> > > > > > > 3306011    -63> 2016-07-07 23:48:12.541870 7f7f4ccad700 20 freelist
> > > > > > > _xor first_key 0xc0500000 last_key 0xc0500000
> > > > > > > 3306012    -62> 2016-07-07 23:48:12.541881 7f7f4ccad700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_finalize_kv 
> > > > > > > release
> > > > > > > 0xc06c0000~10000
> > > > > > > 3306013    -61> 2016-07-07 23:48:12.541884 7f7f4ccad700 10 freelist
> > > > > > > release 0xc06c0000~10000
> > > > > > > 3306014    -60> 2016-07-07 23:48:12.541886 7f7f4ccad700 20 freelist
> > > > > > > _xor first_key 0xc0680000 last_key 0xc0680000
> > > > > > > 3306015    -59> 2016-07-07 23:48:12.541890 7f7f4ccad700 10
> > > > > > > bitmapalloc:release 0xc06c0000~10000
> > > > > > > 3306016    -58> 2016-07-07 23:48:12.541954 7f7f4ccad700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2)
> > > > > > > _balance_bluefs_freespace bluefs
> > > > > > > 2868 M free (0.999654) bluestore 65426 M free (0.91276), 
> > > > > > > bluefs_ratio
> > > > > > > 0.0419945
> > > > > > > 3306017    -57> 2016-07-07 23:48:12.541967 7f7f4449c700  0
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_write_nodes  
> > > > > > > onode #0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head# is 6551
> > > > > > > 3306018    -56> 2016-07-07 23:48:12.542026 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_state_proc txc
> > > > > > > 0x177b0000 prepare
> > > > > > > 3306019    -55> 2016-07-07 23:48:12.542031 7f7f4ccad700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _kv_sync_thread 
> > > > > > > committed
> > > > > > > 1 cleaned 0 in 0.000284
> > > > > > > 3306020    -54> 2016-07-07 23:48:12.542037 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_aio_submit txc 0x177b0000
> > > > > > > 3306021    -53> 2016-07-07 23:48:12.542037 7f7f4ccad700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_state_proc txc
> > > > > > > 0xedfef00 kv_queued
> > > > > > > 3306022    -52> 2016-07-07 23:48:12.542044 7f7f4ccad700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_finish_kv txc 0xedfef00
> > > > > > > 3306023    -51> 2016-07-07 23:48:12.542054 7f7f4ccad700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_state_proc txc
> > > > > > > 0xedfef00 finishing
> > > > > > > 3306024    -50> 2016-07-07 23:48:12.542057 7f7f4ccad700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_finish 0xedfef00 
> > > > > > > onodes
> > > > > > > 0xa662000
> > > > > > > 3306025    -49> 2016-07-07 23:48:12.542059 7f7f4ccad700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_finish onode
> > > > > > > 0xa662000 had
> > > > > > > 0xedfef00,0x177b0000
> > > > > > > 3306026    -48> 2016-07-07 23:48:12.542066 7f7f4ccad700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _osr_reap_done osr 0xac78760
> > > > > > > 3306027    -47> 2016-07-07 23:48:12.542068 7f7f4ccad700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _osr_reap_done  txc 0xedfef00 done
> > > > > > > 3306028    -46> 2016-07-07 23:48:12.542074 7f7f4ccad700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _osr_reap_done  txc
> > > > > > > 0x177b0000 aio_wait
> > > > > > > 3306029    -45> 2016-07-07 23:48:12.542077 7f7f4ccad700 20
> > > > > > > bluestore.2QCache(0xa02f240) trim onodes 140 / 16384 
> > > > > > > buffers
> > > > > > > 0 /
> > > > > > > 536870912
> > > > > > > 3306030    -44> 2016-07-07 23:48:12.542081 7f7f4ccad700 10
> > > > > > > bitmapalloc:commit_finish instance 174395776 released 
> > > > > > > 65536 in extents
> > > > > > > 1
> > > > > > > 3306031    -43> 2016-07-07 23:48:12.542084 7f7f4ccad700 20
> > > > > > > bitmapalloc:insert_free instance 174395776 off 0xc06b0000 len 0x10000
> > > > > > > 3306032    -42> 2016-07-07 23:48:12.542090 7f7f4ccad700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _reap_collections all reaped
> > > > > > > 3306033    -41> 2016-07-07 23:48:12.542093 7f7f4ccad700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _kv_sync_thread sleep
> > > > > > > 3306034    -40> 2016-07-07 23:48:12.542110 7f7f4449c700  5 -- op
> > > > > > > tracker -- seq: 57709, time: 2016-07-07 23:48:12.542109, event:
> > > > > > > reached_pg, op: osd_op(client.4112.0:176011 0.de0d304f
> > > > > > > (undecoded)
> > > > > > > ack+ondisk+wri        te+known_if_redirected e19)
> > > > > > > 3306035    -39> 2016-07-07 23:48:12.542168 7f7f4449c700  5 -- op
> > > > > > > tracker -- seq: 57709, time: 2016-07-07 23:48:12.542167, event:
> > > > > > > started, op: osd_op(client.4112.0:176011 0.de0d304f
> > > > > > > rbd_data.100d2ae8944a.0000000        000000095 [write 1769472~65536]
> > > > > > > snapc 0=[] ack+ondisk+write+known_if_redirected e19)
> > > > > > > 3306036    -38> 2016-07-07 23:48:12.542248 7f7f4449c700  5 write_log
> > > > > > > with: dirty_to: 0'0, dirty_from:
> > > > > > > 4294967295'18446744073709551615,
> > > > > > > dirty_divergent_priors: false, divergent_priors: 0, writeout_from:
> > > > > > > 19'604,         trimmed:
> > > > > > > 3306037    -37> 2016-07-07 23:48:12.542276 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) queue_transactions 
> > > > > > > existing
> > > > > > > 0xac78760 osr(0.4f 0xb6d2d80)
> > > > > > > 3306038    -36> 2016-07-07 23:48:12.542288 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_create osr
> > > > > > > 0xac78760 =
> > > > > > > 0x1252f980 seq 612
> > > > > > > 3306039    -35> 2016-07-07 23:48:12.542303 7f7f4449c700 15
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _write 0.4f_head 
> > > > > > > #0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head#
> > > > > > > 0x1b0000~10000
> > > > > > > 3306040    -34> 2016-07-07 23:48:12.542315 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _do_write 
> > > > > > > #0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head#
> > > > > > > 0x1b0000~10000 - have 0x400000 (4194304) bytes         in 64 lextents
> > > > > > > 3306041    -33> 2016-07-07 23:48:12.542321 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _do_write prefer 
> > > > > > > csum_order 12 comp_blob_size 0x40000
> > > > > > > 3306042    -32> 2016-07-07 23:48:12.542324 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _do_write_big
> > > > > > > 0x1b0000~10000 max_blob_len 0x10000 compress 0
> > > > > > > 3306043    -31> 2016-07-07 23:48:12.542328 7f7f4449c700 20
> > > > > > > bluestore.BufferSpace(0x12013358 in 0xa02f240) _discard 0x0~10000
> > > > > > > 3306044    -30> 2016-07-07 23:48:12.542336 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _do_write_big  lex 0x1b0000:
> > > > > > > 0x0~10000->92
> > > > > > > 3306045    -29> 2016-07-07 23:48:12.542339 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _do_write_big  blob 
> > > > > > > 92:blob([] clen 0x0 ref_map(0x0~10000=1))
> > > > > > > 3306046    -28> 2016-07-07 23:48:12.542344 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _do_alloc_write txc
> > > > > > > 0x1252f980 1 blobs
> > > > > > > 3306047    -27> 2016-07-07 23:48:12.542346 7f7f4449c700 10
> > > > > > > bitmapalloc:reserve instance 174395776 num_used 1600847 total 18350080
> > > > > > > 3306048    -26> 2016-07-07 23:48:12.542350 7f7f4449c700 10
> > > > > > > bitmapalloc:allocate instance 174395776 want_size 0x10000 
> > > > > > > alloc_unit
> > > > > > > 0x1000 hint 0x0
> > > > > > > 3306049    -25> 2016-07-07 23:48:12.542442 7f7f4449c700 20
> > > > > > > bitmapalloc:allocate instance 174395776 offset 0xc0530000 
> > > > > > > length
> > > > > > > 0x10000
> > > > > > > 3306050    -24> 2016-07-07 23:48:12.542455 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _do_alloc_write blob 
> > > > > > > 92:blob([0xc0530000~10000] clen 0x0 mutable ref_map(0x0~10000=1))
> > > > > > > csum_order 12 csum_length 0x        10000
> > > > > > > 3306051    -23> 2016-07-07 23:48:12.542437 7f7f55cbf700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_state_proc txc
> > > > > > > 0x177b0000 aio_wait
> > > > > > > 3306052    -22> 2016-07-07 23:48:12.542482 7f7f4449c700  0
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _wctx_finish onode 
> > > > > > > #0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head#
> > > > > > > 3306053    -21> 2016-07-07 23:48:12.542488 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _wctx_finish lex_old 
> > > > > > > [0x0~10000->28]
> > > > > > > 3306054    -20> 2016-07-07 23:48:12.542485 7f7f55cbf700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_finish_io 0x177b0000
> > > > > > > 3306055    -19> 2016-07-07 23:48:12.542492 7f7f55cbf700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_state_proc txc
> > > > > > > 0x177b0000 io_done
> > > > > > > 3306056    -18> 2016-07-07 23:48:12.542493 7f7f4449c700 20
> > > > > > > bluestore.BufferSpace(0xd661088 in 0xa02f240) _discard 0x0~10000
> > > > > > > 3306057    -17> 2016-07-07 23:48:12.542495 7f7f55cbf700  0
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_state_procIO_DONE 
> > > > > > > txc
> > > > > > > 0x177b0000
> > > > > > > 3306058    -16> 2016-07-07 23:48:12.542496 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _wctx_finish release
> > > > > > > 0xc06e0000~10000
> > > > > > > 3306059    -15> 2016-07-07 23:48:12.542500 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _wctx_finish rm blob 
> > > > > > > 28:blob([!~10000] clen 0x0 mutable+csum crc32c/0x1000)
> > > > > > > 3306060    -14> 2016-07-07 23:48:12.542499 7f7f55cbf700  0
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_state_proc onode 
> > > > > > > #0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head# 0 size=65
> > > > > > > 3306061    -13> 2016-07-07 23:48:12.542510 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _write 0.4f_head 
> > > > > > > #0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head#
> > > > > > > 0x1b0000~10000 = 0
> > > > > > > 3306062    -12> 2016-07-07 23:48:12.542520 7f7f4449c700 15
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _setattrs 0.4f_head 
> > > > > > > #0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head# 2 keys
> > > > > > > 3306063    -11> 2016-07-07 23:48:12.542527 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _setattrs 0.4f_head 
> > > > > > > #0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head# 2 keys = 0
> > > > > > > 3306064    -10> 2016-07-07 23:48:12.542535 7f7f4449c700 15
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _omap_setkeys 
> > > > > > > 0.4f_head #0:f2000000::::head#
> > > > > > > 3306065     -9> 2016-07-07 23:48:12.542547 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _omap_setkeys 
> > > > > > > 0.4f_head #0:f2000000::::head# = 0
> > > > > > > 3306066     -8> 2016-07-07 23:48:12.542553 7f7f4449c700 20
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_write_nodes txc
> > > > > > > 0x1252f980 onodes 0xa662000 bnodes
> > > > > > > 3306067     -7> 2016-07-07 23:48:12.542656 7f7f4449c700  0
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_write_nodes  
> > > > > > > onode #0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head# is 6552
> > > > > > > 3306068     -6> 2016-07-07 23:48:12.542703 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_state_proc txc
> > > > > > > 0x1252f980 prepare
> > > > > > > 3306069     -5> 2016-07-07 23:48:12.542712 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) _txc_aio_submit txc 0x1252f980
> > > > > > > 3306070     -4> 2016-07-07 23:48:12.542800 7f7f4449c700  5 -- op
> > > > > > > tracker -- seq: 57710, time: 2016-07-07 23:48:12.542800, event:
> > > > > > > reached_pg, op: osd_op(client.4112.0:176012 0.de0d304f
> > > > > > > (undecoded)
> > > > > > > ack+ondisk+wri        te+known_if_redirected e19)
> > > > > > > 3306071     -3> 2016-07-07 23:48:12.542860 7f7f4449c700  5 -- op
> > > > > > > tracker -- seq: 57710, time: 2016-07-07 23:48:12.542859, event:
> > > > > > > started, op: osd_op(client.4112.0:176012 0.de0d304f
> > > > > > > rbd_data.100d2ae8944a.0000000        000000095 [write 1835008~65536]
> > > > > > > snapc 0=[] ack+ondisk+write+known_if_redirected e19)
> > > > > > > 3306072     -2> 2016-07-07 23:48:12.542940 7f7f4449c700  5 write_log
> > > > > > > with: dirty_to: 0'0, dirty_from:
> > > > > > > 4294967295'18446744073709551615,
> > > > > > > dirty_divergent_priors: false, divergent_priors: 0, writeout_from:
> > > > > > > 19'605,         trimmed:
> > > > > > > 3306073     -1> 2016-07-07 23:48:12.542979 7f7f4449c700 10
> > > > > > > bluestore(/mnt/ceph/build/dev/osd2) queue_transactions 
> > > > > > > existing
> > > > > > > 0xac78760 osr(0.4f 0xb6d2d80)
> > > > > > > 3306074      0> 2016-07-07 23:48:12.547121 7f7f55cbf700 -1 *** Caught
> > > > > > > signal (Segmentation fault) **
> > > > > > > 3306075  in thread 7f7f55cbf700 thread_name:bstore_aio
> > > > > > > 3306076
> > > > > > > 3306077  ceph version v11.0.0-373-g7dedce8
> > > > > > > (7dedce8a6e0474d4d14f9aa509428bab84d075af)
> > > > > > > 3306078  1: /mnt/ceph/build/bin/ceph-osd() [0xc329ae]
> > > > > > > 3306079  2: (()+0x10a00) [0x7f7f62923a00]
> > > > > > > 3306080  3:
> > > > > > > (BlueStore::_txc_state_proc(BlueStore::TransContext*)+0x8c
> > > > > > > b)
> > > > > > > [0xb4798b]
> > > > > > > 3306081  4:
> > > > > > > (BlueStore::_txc_finish_io(BlueStore::TransContext*)+0x1bf
> > > > > > > )
> > > > > > > [0xb4801f]
> > > > > > > 3306082  5:
> > > > > > > (BlueStore::_txc_state_proc(BlueStore::TransContext*)+0x27
> > > > > > > f)
> > > > > > > [0xb4733f]
> > > > > > > 3306083  6: (KernelDevice::_aio_thread()+0x912) [0xc1a872]
> > > > > > > 3306084  7: 
> > > > > > > (KernelDevice::AioCompletionThread::entry()+0xd)
> > > > > > > [0xc1d81d]
> > > > > > > 3306085  8: (()+0x761a) [0x7f7f6291a61a]
> > > > > > > 3306086  9: (clone()+0x6d) [0x7f7f6059959d]
> > > > > > > 3306087  NOTE: a copy of the executable, or `objdump -rdS 
> > > > > > > <executable>` is needed to interpret this.
> > > > > > >
> > > > > > >
> > > > > > > the previous TransContext (3306060)in STATE_IO_DONE and 
> > > > > > > current TransaContext call _write(3306039 ). And they 
> > > > > > > handle the same 
> > > > > > > object(0:f20cb07b:::rbd_data.100d2ae8944a.0000000000000095:head). So the blob_map modify be current TransContext. I always thought:
> > > > > > > objectstore don't allow the two or more write op for same object.
> > > > > > > ObjectContext:: ondisk_write_lock will block the later 
> > > > > > > write op until objectstore call on_commit/on_readable Context.
> > > > > > > But in fact, ondisk_write_lock don't prevent other write op.
> > > > > > >
> > > > > > > I think the simple method is add o->flush().
> > > > > > > Or am I missing something?
> > > > > > >
> > > > > > > Thanks!
> > > > > > >
> > > > > > >
> > > > > > > -----Original Message-----
> > > > > > > From: ceph-devel-owner@vger.kernel.org 
> > > > > > > [mailto:ceph-devel-owner@vger.kernel.org] On Behalf Of 
> > > > > > > Somnath Roy
> > > > > > > Sent: Wednesday, July 6, 2016 10:48 PM
> > > > > > > To: Mark Nelson <mnelson@redhat.com>; Varada Kari 
> > > > > > > <Varada.Kari@sandisk.com>; ceph-devel 
> > > > > > > <ceph-devel@vger.kernel.org>
> > > > > > > Subject: RE: segfault in bluestore during random writes
> > > > > > >
> > > > > > > I got it ~6/23 , so we need to look for commits before that..
> > > > > > >
> > > > > > > -----Original Message-----
> > > > > > > From: Mark Nelson [mailto:mnelson@redhat.com]
> > > > > > > Sent: Wednesday, July 06, 2016 7:45 AM
> > > > > > > To: Somnath Roy; Varada Kari; ceph-devel
> > > > > > > Subject: Re: segfault in bluestore during random writes
> > > > > > >
> > > > > > > Ah, sorry I missed it.  Do you remember when you first encountered it?
> > > > > > > Might help track down the commit where it first appeared.
> > > > > > >
> > > > > > > Mark
> > > > > > >
> > > > > > > On 07/06/2016 09:32 AM, Somnath Roy wrote:
> > > > > > > > Mark,
> > > > > > > > This is the same trace I got (and posted in community) 
> > > > > > > > while you were in vacation. I can still reproduce this in my setup easily.
> > > > > > > >
> > > > > > > > Thanks & Regards
> > > > > > > > Somnath
> > > > > > > >
> > > > > > > > -----Original Message-----
> > > > > > > > From: ceph-devel-owner@vger.kernel.org 
> > > > > > > > [mailto:ceph-devel-owner@vger.kernel.org] On Behalf Of 
> > > > > > > > Mark Nelson
> > > > > > > > Sent: Wednesday, July 06, 2016 7:02 AM
> > > > > > > > To: Varada Kari; ceph-devel
> > > > > > > > Subject: Re: segfault in bluestore during random writes
> > > > > > > >
> > > > > > > > Oh, sorry, this wasn't memdbstore, this was trim cache 
> > > > > > > > on reads which got applied earlier this week.  I was 
> > > > > > > > testing
> > > > > > > > 06178de9 with the trim cache on reads PR applied.
> > > > > > > >
> > > > > > > > Mark
> > > > > > > >
> > > > > > > > On 07/06/2016 07:00 AM, Mark Nelson wrote:
> > > > > > > > > Hi Varada,
> > > > > > > > >
> > > > > > > > > Ah, this version happens to be with the memstoredb 
> > > > > > > > > patch applied, though it is unused in this test.  I 
> > > > > > > > > don't believe this should be causing the problem, but 
> > > > > > > > > I'll verify it is happening without that patch as well.
> > > > > > > > >
> > > > > > > > > Mark
> > > > > > > > >
> > > > > > > > > On 07/06/2016 01:45 AM, Varada Kari wrote:
> > > > > > > > > > Hi mark,
> > > > > > > > > >
> > > > > > > > > > I have tried reproducing the issue with latest 
> > > > > > > > > > master, so far no luck with 128k and 512k block sizes on a 1000GB rbd image.
> > > > > > > > > > I couldn't find
> > > > > > > > > > #5e07e5a3446ee39189c5b959be624411561175f5 in master, 
> > > > > > > > > > are you using any private changes?
> > > > > > > > > >
> > > > > > > > > > I will try some more time today to reproduce the issue.
> > > > > > > > > > Seems blob map got corrupted in your case.
> > > > > > > > > >
> > > > > > > > > > Varada
> > > > > > > > > >
> > > > > > > > > > On Tuesday 05 July 2016 09:06 PM, Mark Nelson wrote:
> > > > > > > > > > > Hi Guys,
> > > > > > > > > > >
> > > > > > > > > > > This is primarily for Varada but if anyone else 
> > > > > > > > > > > wants to take a look feel free.  We are hitting 
> > > > > > > > > > > segfaults in tc_state_proc during random writes.  
> > > > > > > > > > > I was able to reproduce with logging enabled and got a core dump.
> > > > > > > > > > > I've only briefly looked at the code/logs, but I 
> > > > > > > > > > > haven't really looked through it in earnest yet.
> > > > > > > > > > > Unfortunately the
> > > > > > > > > > > logs are about 4GB and the core dump is 2GB, so 
> > > > > > > > > > > I'll only attach the last 10k lines.
> > > > > > > > > > > Hopefully it should be fairly reproducible.  I'll 
> > > > > > > > > > > try to see if I can narrow down commits that have 
> > > > > > > > > > > touched the write path over the last 4 weeks and 
> > > > > > > > > > > see if anything looks relevant.
> > > > > > > > > > >
> > > > > > > > > > > Varada: let me know if you can reproduce.  Thanks!
> > > > > > > > > > >
> > > > > > > > > > > gdb bt:
> > > > > > > > > > >
> > > > > > > > > > > > (gdb) bt
> > > > > > > > > > > > #0  0x00007f9c59708fcb in raise (sig=11) at
> > > > > > > > > > > > ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:37
> > > > > > > > > > > > #1  0x0000000000bd7505 in reraise_fatal
> > > > > > > > > > > > (signum=11) at
> > > > > > > > > > > > /home/ubuntu/src/markhpc/ceph/src/global/signal_
> > > > > > > > > > > > ha
> > > > > > > > > > > > nd
> > > > > > > > > > > > ler.cc:69
> > > > > > > > > > > > #2  handle_fatal_signal (signum=11) at 
> > > > > > > > > > > > /home/ubuntu/src/markhpc/ceph/src/global/signal_
> > > > > > > > > > > > ha
> > > > > > > > > > > > nd
> > > > > > > > > > > > ler.cc:133
> > > > > > > > > > > > #3  <signal handler called>
> > > > > > > > > > > > #4  next_node (node=<synthetic pointer>) at 
> > > > > > > > > > > > /usr/include/boost/intrusive/detail/tree_algorithms.
> > > > > > > > > > > > hpp:446
> > > > > > > > > > > > #5  next_node (p=<synthetic pointer>) at 
> > > > > > > > > > > > /usr/include/boost/intrusive/rbtree_algorithms.h
> > > > > > > > > > > > pp
> > > > > > > > > > > > :3
> > > > > > > > > > > > 52
> > > > > > > > > > > > #6  operator++ (this=<synthetic pointer>) at
> > > > > > > > > > > > /usr/include/boost/intrusive/detail/tree_node.hpp:
> > > > > > > > > > > > 12
> > > > > > > > > > > > 8
> > > > > > > > > > > > #7  BlueStore::_txc_state_proc 
> > > > > > > > > > > > (this=this@entry=0xaff6000,
> > > > > > > > > > > > txc=txc@entry=0x192c8c80) at 
> > > > > > > > > > > > /home/ubuntu/src/markhpc/ceph/src/os/bluestore/B
> > > > > > > > > > > > lu
> > > > > > > > > > > > eS
> > > > > > > > > > > > tore.cc:4568
> > > > > > > > > > > > #8  0x0000000000aeddb7 in 
> > > > > > > > > > > > BlueStore::_txc_finish_io 
> > > > > > > > > > > > (this=this@entry=0xaff6000,
> > > > > > > > > > > > txc=txc@entry=0x192c8c80) at 
> > > > > > > > > > > > /home/ubuntu/src/markhpc/ceph/src/os/bluestore/B
> > > > > > > > > > > > lu
> > > > > > > > > > > > eS
> > > > > > > > > > > > tore.cc:4669
> > > > > > > > > > > > #9  0x0000000000aed23f in 
> > > > > > > > > > > > BlueStore::_txc_state_proc (this=0xaff6000,
> > > > > > > > > > > > txc=0x192c8c80) at 
> > > > > > > > > > > > /home/ubuntu/src/markhpc/ceph/src/os/bluestore/B
> > > > > > > > > > > > lu
> > > > > > > > > > > > eS
> > > > > > > > > > > > tore.cc:4559
> > > > > > > > > > > > #10 0x0000000000bc134a in 
> > > > > > > > > > > > KernelDevice::_aio_thread
> > > > > > > > > > > > (this=0xaf20960) at 
> > > > > > > > > > > > /home/ubuntu/src/markhpc/ceph/src/os/bluestore/K
> > > > > > > > > > > > er
> > > > > > > > > > > > ne
> > > > > > > > > > > > lDevice.cc:270
> > > > > > > > > > > > #11 0x0000000000bc588d in 
> > > > > > > > > > > > KernelDevice::AioCompletionThread::entry
> > > > > > > > > > > > (this=<optimized out>) at 
> > > > > > > > > > > > /home/ubuntu/src/markhpc/ceph/src/os/bluestore/K
> > > > > > > > > > > > er
> > > > > > > > > > > > ne
> > > > > > > > > > > > lDevice.h:49
> > > > > > > > > > > > #12 0x00007f9c59701dc5 in start_thread
> > > > > > > > > > > > (arg=0x7f9c4da2e700) at
> > > > > > > > > > > > pthread_create.c:308
> > > > > > > > > > > > #13 0x00007f9c575fc28d in clone () at
> > > > > > > > > > > > ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
> > > > > > > > > > > > (gdb) frame 7
> > > > > > > > > > > > #7  BlueStore::_txc_state_proc 
> > > > > > > > > > > > (this=this@entry=0xaff6000,
> > > > > > > > > > > > txc=txc@entry=0x192c8c80) at 
> > > > > > > > > > > > /home/ubuntu/src/markhpc/ceph/src/os/bluestore/B
> > > > > > > > > > > > lu
> > > > > > > > > > > > eS
> > > > > > > > > > > > tore.cc:4568 4568for (auto& p :
> > > > > > > > > > > > o->blob_map.blob_map) {
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