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From: Bob Proulx <bob@proulx.com>
To: tech-volunteer-meeting@fsf.org
Subject: Update 2022-02-01
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> * Three of the six components of subversion are working.

Have all of the Subversion components running now.

    PASS: svn-http
    PASS: svn-https
    PASS: svn-rsync
    PASS: svn-ssh
    PASS: svn-svn
    PASS: svn-web

Could switch svn over to the new vcs2 at any time.  However due to the
ssh host keys maybe being upgraded to ed25519 keys it would make it
undesireable to move it back.  And right now it there have been no
complaints from any of the svn, hg, bzr users about ssh.

Also having a separate system means a doubling of the kernel resources
for networking.  Honestly things have never run smoother now that git
is on it's own server and the others are on their own.

Therefore I am inclined to keep working through the various issues for
each of the systems and switch over later when everything is ready.

I started working on hg next.  Made good progress through the parts of
it.  Got snarled up with the anonymous hg service through xinetd.
Eventually figured out my mistake.  Got the http & https protocols
running.  And now things like like this.

    PASS: hg-hg
    PASS: hg-rsync
    FAIL: hg-ssh
    PASS: hg-web

I am now stuck on the hs over ssh which seems like it should be the
simplest and most robust.  But I am getting this error.

    $ hg clone ssh://rwp@hg.savannah.gnu.org/test-project
    remote: abort: potentially unsafe serve --stdio invocation: ['--cwd', '/srv/hg', '-R', 'test-project', 'serve', '--stdio']
    abort: no suitable response from remote hg!

This works over hg:// and http:// and https:// so this is really
strange that it is failing when used over ssh:// instead.

My web search fu is failing me.  Something about the newer version of
hg on the new server almost certainly.  And we have already run into a
CVE that was against 2.8.2 which caused us to freeze there because
later versions, at that time, were broken.  This might be the above
problem hit again as a deja vu and until I find the old email
discussion about it I won't remember the details.  The old version was
2.8.2 and the new version is 4.5.3 so they cranked through a bunch of
changes in OS release timeframe!

Any ideas?

I am going to let that sit and switch to working on bzr.  And/Or I
will be working on the web UI frontend.  Both of those are the next
priorities.  Behind them are the download and audio-video server and
the SQL database server.  Not to mention the debbugs BTS.  Or the
other sourcehut system.  :-)

Bob


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The network outage this morning separated the VMs from their root file
systems running on the Ceph partition.  For something like a little
over an hour.  Some systems seemed to recover better than others.
Thanks to Amin Bandali to reboot vcs2 which was really broken this
morning.

The details look like the kernel log snippet included at the bottom of
this message.  Those types of failures appeared repeating from the
start until the end of the network event around 9:38am US/Eastern.
If any VM shows this type of problem then it's not good.  It's hard to
predict the state of the running processes afterward.  Also some of
the systems didn't have anything logged because the log directory is
on the same root file system and couldn't log it.

We saw something almost exactly like this January 5th.  Some of the
active daemons at the time were killed by it.  Which isn't surprising.
Things weren't happy.  And all of the systems were rebooted then for
the same reason of resetting everything to a known state.

I suggest that all VM owners reboot their VMs in order to ensure that
they have no problems.  I have rebooted all of the systems I can,
that's 16 systems, and they are all rebooted to a good happy state.

Bob


Feb  1 08:16:57 vcs2 kernel: [3513312.220439] INFO: task xfsaild/dm-0:341 blocked for more than 120 seconds.
Feb  1 08:16:57 vcs2 kernel: [3513312.220443]       Not tainted 4.15.0-161-generic #169+9.0trisquel9
Feb  1 08:16:57 vcs2 kernel: [3513312.220444] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Feb  1 08:16:57 vcs2 kernel: [3513312.220446] xfsaild/dm-0    D    0   341      2 0x80000000
Feb  1 08:16:57 vcs2 kernel: [3513312.220450] Call Trace:
Feb  1 08:16:57 vcs2 kernel: [3513312.220509]  __schedule+0x24e/0x890
Feb  1 08:16:57 vcs2 kernel: [3513312.220536]  ? lock_timer_base+0x6b/0x90
Feb  1 08:16:57 vcs2 kernel: [3513312.220538]  schedule+0x2c/0x80
Feb  1 08:16:57 vcs2 kernel: [3513312.220754]  _xfs_log_force+0x159/0x2a0 [xfs]
Feb  1 08:16:57 vcs2 kernel: [3513312.220772]  ? wake_up_q+0x80/0x80
Feb  1 08:16:57 vcs2 kernel: [3513312.220807]  ? xfsaild+0x1b6/0x7e0 [xfs]
Feb  1 08:16:57 vcs2 kernel: [3513312.220841]  xfs_log_force+0x2c/0x80 [xfs]
Feb  1 08:16:57 vcs2 kernel: [3513312.220876]  xfsaild+0x1b6/0x7e0 [xfs]
Feb  1 08:16:57 vcs2 kernel: [3513312.220884]  kthread+0x121/0x140
Feb  1 08:16:57 vcs2 kernel: [3513312.220887]  ? kthread+0x121/0x140
Feb  1 08:16:57 vcs2 kernel: [3513312.220921]  ? xfs_trans_ail_cursor_first+0x90/0x90 [xfs]
Feb  1 08:16:57 vcs2 kernel: [3513312.220923]  ? kthread_create_worker_on_cpu+0x70/0x70
Feb  1 08:16:57 vcs2 kernel: [3513312.220926]  ret_from_fork+0x22/0x40
Feb  1 08:16:57 vcs2 kernel: [3513312.220938] INFO: task monit:664 blocked for more than 120 seconds.
Feb  1 08:16:57 vcs2 kernel: [3513312.220939]       Not tainted 4.15.0-161-generic #169+9.0trisquel9
Feb  1 08:16:57 vcs2 kernel: [3513312.220940] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Feb  1 08:16:57 vcs2 kernel: [3513312.220941] monit           D    0   664      1 0x00000000
Feb  1 08:16:57 vcs2 kernel: [3513312.220943] Call Trace:
Feb  1 08:16:57 vcs2 kernel: [3513312.220947]  __schedule+0x24e/0x890
Feb  1 08:16:57 vcs2 kernel: [3513312.220961]  ? __filemap_fdatawrite_range+0xcf/0x100
Feb  1 08:16:57 vcs2 kernel: [3513312.220964]  schedule+0x2c/0x80
Feb  1 08:16:57 vcs2 kernel: [3513312.220998]  _xfs_log_force_lsn+0x2cf/0x350 [xfs]
Feb  1 08:16:57 vcs2 kernel: [3513312.221000]  ? wake_up_q+0x80/0x80
Feb  1 08:16:57 vcs2 kernel: [3513312.221033]  xfs_file_fsync+0xfd/0x230 [xfs]
Feb  1 08:16:57 vcs2 kernel: [3513312.221055]  vfs_fsync_range+0x51/0xb0
Feb  1 08:16:57 vcs2 kernel: [3513312.221057]  do_fsync+0x3d/0x70
Feb  1 08:16:57 vcs2 kernel: [3513312.221060]  SyS_fsync+0x10/0x20
Feb  1 08:16:57 vcs2 kernel: [3513312.221075]  do_syscall_64+0x73/0x130
Feb  1 08:16:57 vcs2 kernel: [3513312.221077]  entry_SYSCALL_64_after_hwframe+0x41/0xa6
Feb  1 08:16:57 vcs2 kernel: [3513312.221080] RIP: 0033:0x7f662e5a9bf7
Feb  1 08:16:57 vcs2 kernel: [3513312.221081] RSP: 002b:00007ffc255d2e00 EFLAGS: 00000293 ORIG_RAX: 000000000000004a
Feb  1 08:16:57 vcs2 kernel: [3513312.221082] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f662e5a9bf7
Feb  1 08:16:57 vcs2 kernel: [3513312.221084] RDX: 0000000000000000 RSI: 00007ffc255d2e30 RDI: 0000000000000004
Feb  1 08:16:57 vcs2 kernel: [3513312.221085] RBP: 00007ffc255d2e30 R08: 0000000000000000 R09: 0000000000000004
Feb  1 08:16:57 vcs2 kernel: [3513312.221086] R10: 00000000fffffffc R11: 0000000000000293 R12: 00005632626b7b68
Feb  1 08:16:57 vcs2 kernel: [3513312.221087] R13: 0000000000000000 R14: 00007ffc255d2f74 R15: 0000000000000000
Feb  1 08:18:00 vcs2 kernel: [3513375.708341] nfs: server nfs1 not responding, still trying
Feb  1 08:18:09 vcs2 kernel: [3513384.156205] nfs: server nfs1 not responding, still trying


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On 2/1/22 18:56, Bob Proulx wrote:

>      $ hg clone ssh://rwp@hg.savannah.gnu.org/test-project
>      remote: abort: potentially unsafe serve --stdio invocation: ['--cwd', '/srv/hg', '-R', 'test-project', 'serve', '--stdio']
>      abort: no suitable response from remote hg!
> 
> This works over hg:// and http:// and https:// so this is really
> strange that it is failing when used over ssh:// instead.

I'm not sure what the solution is, but here's a description of the error 
message from the hg source code:

             if realcmd == b'serve' and b'--stdio' in cmdargs:
                 # We want to constrain 'hg serve --stdio' instances pretty
                 # closely, as many shared-ssh access tools want to grant
                 # access to run *only* 'hg -R $repo serve --stdio'. We
                 # restrict to exactly that set of arguments, and prohibit
                 # any repo name that starts with '--' to prevent
                 # shenanigans wherein a user does something like pass
                 # --debugger or --config=ui.debugger=1 as a repo
                 # name. This used to actually run the debugger.
                 if (
                     len(req.args) != 4
                     or req.args[0] != b'-R'
                     or req.args[1].startswith(b'--')
                     or req.args[2] != b'serve'
                     or req.args[3] != b'--stdio'
                 ):
                     raise error.Abort(
                         _(b'potentially unsafe serve --stdio 
invocation: %s')
                         % (stringutil.pprint(req.args),)
                     )

-- 
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the Combined Federal Campaign. https://cfcgiving.opm.gov/


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From: Bob Proulx <bob@proulx.com>
To: tech-volunteer-meeting@fsf.org
Subject: Re: Update 2022-02-01
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Andrew Engelbrecht wrote:
> I'm not sure what the solution is, but here's a description of the error
> message from the hg source code:

Thanks for finding the source of this in the source.  This is tickling
some vague memories of a problem we ran into years ago.  It's too bad
Trisquel doesn't keep an archive of historical package releases but
both Debian and Ubuntu do.  I think I will line up these packages with
those from the Ubuntu archive and see if this change is one that went
in right after the last working version we are using.  It might be.

There is enough other work to keep us busy before needing to address
this problem directly.  Have to do so eventually.  But I am going to
let it sit for a while and try to catch up on the other work such as
bzr and MariaDB first.  Pick the lower hanging fruit first.  And then
circle back around to this.

Thanks!
Bob


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From: Bob Proulx <bob@proulx.com>
To: tech-volunteer-meeting@fsf.org
Subject: Forgotten ViewVC discussion 2022-02-16
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Oh!  In my summary today afterwards I realized I forgot to say that
there is one ViewVC issue with subversion that is still floating
around somewhat.

    https://savannah.nongnu.org/support/index.php?110608
    error when calculating annotation data with viewvc

This is working on the new system but failing on the old system.
Philippe reporting the problem was happy enough to use the new
"svntmp" name I provided for testing this on the new server.  But I
haven't really resolved the issue yet.

Since moving git to the new server there have been *zero* problems
with overloaded system on either side causing problems.  I don't know
if that is actual or just because there haven't been the same bad
abuse waves coming through.  But it has me wanting to drag my feet
about moving subversion over.  But once moved I can't really move it
back due to the ssh host keys and the SHA1 deprecation issue.  All
anonymous services such as svn:// http:// https:// all can be moved
back and forth immediately with no problem.  But ssh:// has host state
of host keys associated and can really only move forward.  Therefore I
was holding off on switching it for the moment.

Therefore I am going to try to fix the error on the old system.  But I
would guess this error has been there for two years already and this
is the first problem report on it.  It can't be a heavily used feature
or we should have heard about it more previously.

Bob


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Bob Proulx wrote:
> Andrew Engelbrecht wrote:
> > I'm not sure what the solution is, but here's a description of the error
> > message from the hg source code:
>
> Thanks for finding the source of this in the source.  This is tickling
> some vague memories of a problem we ran into years ago.  It's too bad
> Trisquel doesn't keep an archive of historical package releases but
> both Debian and Ubuntu do.  I think I will line up these packages with
> those from the Ubuntu archive and see if this change is one that went
> in right after the last working version we are using.  It might be.

Update!

    09:11 <thomzane> rwp: deb http://oldarchive.trisquel.info/trisquel/ toutatis main
    09:59 <rwp> thomzane, Yay!  That works!  I don't need to go all of the way back to toutatis but it works for belenos which is where I need to investigate versions.
    10:09 <thomzane> Glad it works!

That gets me access to the versions needing investigation on this
problem.  Yay!  I gave it a quick look and it's definitely related.
This gets me pretty much on top of the problem.  But because this
makes things a bigger task I am going to postpone this until finishing
the other work on bzr, frontend, MariaDB, and so forth.

Bob


