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Bug#1016394: column_family.cc:1494: rocksdb::ColumnFamilySet::~ColumnFamilySet(): Assertion `last_ref' failed.

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  Bug#1016394: column_family.cc:1494: rocksdb::ColumnFamilySet::~ColumnFamilySet(): Assertion `last_ref' failed. Linas Vepstas <linasvepstas@gmail.com> - 2022-07-31 04:10 +0200
    Bug#1016394: column_family.cc:1494: rocksdb::ColumnFamilySet::~ColumnFamilySet(): Assertion `last_ref' failed. László Böszörményi (GCS) <gcs@debian.org> - 2022-08-01 19:40 +0200
      Bug#1016394: column_family.cc:1494: rocksdb::ColumnFamilySet::~ColumnFamilySet(): Assertion `last_ref' failed. Linas Vepstas <linasvepstas@gmail.com> - 2022-08-04 10:00 +0200
        Bug#1016394: column_family.cc:1494: rocksdb::ColumnFamilySet::~ColumnFamilySet(): Assertion `last_ref' failed. László Böszörményi (GCS) <gcs@debian.org> - 2022-08-04 21:40 +0200

#1111511 — Bug#1016394: column_family.cc:1494: rocksdb::ColumnFamilySet::~ColumnFamilySet(): Assertion `last_ref' failed.

Package: librocksdb-dev
Version: 7.2.2-5
Severity: normal
X-Debbugs-Cc: linasvepstas@gmail.com

Dear Maintainer,

Software that I maintain is generating the error message
```
./db/column_family.cc:1494: rocksdb::ColumnFamilySet::~ColumnFamilySet(): Assertion `last_ref' failed.
```
when closing a rocks DB (by running the C++ destructor for the open
RockDB handle).  Some notes:

1) My system works great on Debian stable and multiple Ubuntu releases.
   (They're Rocks version 6 I think...)

2) I don't use ColumnFamilies. I don't use anything fancy in Rocks, just
   plain-old simple stuff.

3) Searching the net, it seems like lots of major users (ceph, mariadb)
   hit this bug in 2019. There's a claim that it was a Rocks bug, and
   it seems it was fixed in 2019, but I have not found the patch.

   There seem to have been no reports of this in 2021 or 2022. 

I'm certain this is an issue with RocksDB, and not the way that I am
using it.

I cannot think of any additional details that I can provide that would
be relevant. My package that si affected by this is
https://github.com/opencog/atomspace-rocks -- two unit tests fail,
hitting the above bug. The bug reproduces reliably.

I think the bug is benign, in that it only happens when shutting down, 
and I assume there is no data corruption as the result of it, but ...
I dunno.

-- linas


-- System Information:
Debian Release: bookworm/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 5.18.0-2-amd64 (SMP w/4 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages librocksdb-dev depends on:
ii  libbz2-dev     1.0.8-5
ii  libgflags-dev  2.2.2-2
ii  liblz4-dev     1.9.3-2
ii  librocksdb7.2  7.2.2-5
ii  libsnappy-dev  1.1.9-2
ii  libzstd-dev    1.5.2+dfsg-1
ii  zlib1g-dev     1:1.2.11.dfsg-4

librocksdb-dev recommends no packages.

librocksdb-dev suggests no packages.

-- no debconf information

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#1111687

Control: tags -1 +moreinfo

Hi,

On Sun, Jul 31, 2022 at 4:09 AM Linas Vepstas <linasvepstas@gmail.com> wrote:
> Software that I maintain is generating the error message
> ```
> ./db/column_family.cc:1494: rocksdb::ColumnFamilySet::~ColumnFamilySet(): Assertion `last_ref' failed.
> ```
[...]
> I think the bug is benign, in that it only happens when shutting down,
> and I assume there is no data corruption as the result of it, but ...
> I dunno.
 Version 7.3.1 of RocksDB will migrate to testing this week. Please
test your software with this version and report back.
But honestly, I don't know what to do with this. I'm not a developer
of RocksDB itself. Don't know what caused this message you reported.

Regards,
Laszlo/GCS

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#1111954

[Multipart message — attachments visible in raw view] — view raw

I just built-from-source & tested today's version of
https://github.com/facebook/rocksdb/ -- the problem persists.  It reports
that it is version 7.6.0

I opened https://github.com/facebook/rocksdb/issues/10474 to report the
problem - its more-or-less a duplicate of this issue.

Scrolling through the git commit messages, and searching for `last_ref`
indicates that there are regular, recurring issues having to do with this
-- something to do with lock-free implementations, mutexes and
works-in-progress

--linas

On Mon, Aug 1, 2022 at 8:27 PM László Böszörményi (GCS) <gcs@debian.org>
wrote:

> Control: tags -1 +moreinfo
>
> Hi,
>
> On Sun, Jul 31, 2022 at 4:09 AM Linas Vepstas <linasvepstas@gmail.com>
> wrote:
> > Software that I maintain is generating the error message
> > ```
> > ./db/column_family.cc:1494:
> rocksdb::ColumnFamilySet::~ColumnFamilySet(): Assertion `last_ref' failed.
> > ```
> [...]
> > I think the bug is benign, in that it only happens when shutting down,
> > and I assume there is no data corruption as the result of it, but ...
> > I dunno.
>  Version 7.3.1 of RocksDB will migrate to testing this week. Please
> test your software with this version and report back.
> But honestly, I don't know what to do with this. I'm not a developer
> of RocksDB itself. Don't know what caused this message you reported.
>
> Regards,
> Laszlo/GCS
>


-- 
Patrick: Are they laughing at us?
Sponge Bob: No, Patrick, they are laughing next to us.

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#1112024

Control: tags -1 +upstream -moreinfo
Control: forwarded -1 https://github.com/facebook/rocksdb/issues/10474

On Thu, Aug 4, 2022 at 9:46 AM Linas Vepstas <linasvepstas@gmail.com> wrote:
> I just built-from-source & tested today's version of https://github.com/facebook/rocksdb/ -- the problem persists.  It reports that it is version 7.6.0
>
> I opened https://github.com/facebook/rocksdb/issues/10474 to report the problem - its more-or-less a duplicate of this issue.
 Thanks for the feedback, I will try to follow that bug report and see
when upstream does fix it.

Regards,
Laszlo/GCS

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