Waiting for an answer, setting incomplete to reflect that
** Changed in: openldap (Ubuntu Bionic)
Status: Triaged => Incomplete
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I still haven't been able to sit down and work on this issue. My
comment #31 still applies, though.
I think I have deleted the PPA by mistake. I can recreate it and
reupload the package, but I'm not making any promises to maintain the
PPA nor to backport security fixes; it's just a workaround.
I was able to reproduce this on our test system with comment 13.
This effects our LDAP system too.
We use LDAP for single sign on and with Radius for WiFi, so when it
locks up people can't login to a lot of our systems and WiFi
authentication stops.
This happens anywhere from once a week to
Hi Sergio,
Sorry I don't understand why the bug's importance has decreased to "medium".
Du to client side behavior, issue is totally unpredictable, and slapd no longer
respond to requests.
Morever, the hot fix is not suited for production machines, and can introduce
regression.
Thanks.
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Hi lincvz,
Unfortunately I don't plan to maintain the packages on the PPA; it would
be too cumbersome to keep monitoring security updates and rebuilding the
package every time. My intention with the PPA was to facilitate the
diagnostic of the bug, and also to provide a hotfix for you.
I will
Hi Sergio,
Thanks I appreciate your answer.
Yes I can use the package provided in your PPA, even if it's not very
convenient to install and update it on Production machines. About that, will
you maintain these packages with further security updates ?
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Hello lincvz,
Sorry about the delay. I have been busy with other stuff and did not
have time to follow up on this bug. Here is the lay of the land right
now:
1) Unfortunately, it is unlikely that we will be able to get the SRU
team to accept an upload that reintroduces an issue. This means
Seems the patch is so hard to backport (?)
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https://bugs.launchpad.net/bugs/1926265
Title:
slapd enter in infinite loop on sched_yield syscall
Status in
OK perfect )
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https://bugs.launchpad.net/bugs/1926265
Title:
slapd enter in infinite loop on sched_yield syscall
Status in openldap package in Ubuntu:
Hi lincvz,
We are still trying to determine the best approach here. This is on my
TODO list, and hopefully I can put something together by the end of this
week.
Thank you for your patience.
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Hi Bryce, when will the fix be officially released ?
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https://bugs.launchpad.net/bugs/1926265
Title:
slapd enter in infinite loop on sched_yield syscall
If I understand the work so far, this issue is only present in Bionic,
since later releases already have the release (and the subsequent fix)?
Sounds like the next action here would be to SRU the changes packaged in
https://launchpad.net/~sergiodj/+archive/ubuntu/openldap-
bug1926265/+packages.
** Also affects: openldap (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: openldap (Ubuntu Bionic)
Status: New => Triaged
** Changed in: openldap (Ubuntu Bionic)
Importance: Undecided => High
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Thanks for all )
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https://bugs.launchpad.net/bugs/1926265
Title:
slapd enter in infinite loop on sched_yield syscall
Status in openldap package in Ubuntu:
OK the patch fix the issue for me too in my test env.
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Title:
slapd enter in infinite loop on sched_yield syscall
My bad..
You're right, in my test, the second write() is performed on stdout cause my
ldapsearch command is wrong. I missed the '-H' arg to properly set the LDAP
URI (but you too :-p ).
Consequently, the connection was in LDAP not LDAPS, and "ldaps://..." was the
requested attributs :-s
So
Thanks.
I notice your first write() is on fd 3 while the 2nd is on stdout (while
for me the first 2 are on fd 3, which in my case is the LDAPS socket).
For the issue to be reproduced, we need the client to be paused after
having send the TLS "client hello".
The first time the breakpoint is hit,
Stephane,
I can't reproduce the hang on my test machine with gdb. (Despite your
investigation seems right for me). CPU usage stay low, as usual on this machine
(same slapd config than the production servers, but only 1 CPU is available).
To prove I made the right steps :-) :
$ gdb --args
lincvz:
> Thank you for the patch and your investigations. In the next few days, I
> cannot install the patched package on my production machines. I'll let you
> know when I can.
Thanks.
Can you reproduce a similar issue with the modus operandi (using gdb) I
describe above?
(Note that while
Thank you for the patch and your investigations. In the next few days,
I cannot install the patched package on my production machines. I'll let
you know when I can.
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On Wed, May 19, 2021 at 06:46:02PM -, Sergio Durigan Junior wrote:
>Ryan, IIUC the patch you're proposing fixes the issue experienced by
>Stephane, but we're not entirely sure that it's the same issue being
>reported in this bug. Am I right?
Yes, exactly.
(My debdiff just drops the buggy
OK, here it is:
https://launchpad.net/~sergiodj/+archive/ubuntu/openldap-bug1926265
lincvz, could you please give this a try and check if this package fixes
the issue? Thank you!
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Thanks for the further investigation, Stephane and Ryan. Much
appreciated!
It would be interesting to know if lincvz could test an openldap built
with Ryan's patch, to check if he can still reproduce the bug with it.
I am going to prepare a PPA with Ryan's patch and let you know ASAP.
Ryan,
> This is a valid issue, but are we certain it's the same one? The
> reporter talked about sched_yield and their backtraces included several
> threads of back_monitor waiting on some kind of lock.
You're right. It may be a different issue (though possibly linked to the
same root cause). In my
** Information type changed from Public to Public Security
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Title:
slapd enter in infinite loop on sched_yield
On Fri, May 14, 2021 at 01:36:12PM -, Stephane Chazelas wrote:
>The important backtrace in there is the one from thread 11:
>
>#0 0x7fb288428474 in read () from /lib/x86_64-linux-gnu/libpthread.so.0
>No symbol table info available.
>#1 0x7fb2890c4518 in ?? () from
> It can be reproduced by running on a client:
>
> gdb --args ldapsearch -H ldaps://ldap.example.com -x
>
> Then in gdb:
>
> break write
> run
> continue
I can no longer reproduce it after I rebuild and install the libldap
package with
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: openldap (Ubuntu)
Status: New => Confirmed
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Yes,
https://github.com/openldap/openldap/commit/735e1ab14bb055344b4e767a216aa410aa7d1503
can't be directly applied there. There have been other changes in
between in that section including changes in API, so it would take more
effort to backport that fix.
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cherry picking
https://github.com/openldap/openldap/commit/4c1ab16ade18a253dd81df7e6eced4d920ac6a8e
should fix this particular issue but reintroduce
https://bugs.openldap.org/show_bug.cgi?id=8650.
It may be necessary to pick
The important backtrace in there is the one from thread 11:
#0 0x7fb288428474 in read () from /lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#1 0x7fb2890c4518 in ?? () from /usr/lib/x86_64-linux-gnu/liblber-2.4.so.2
No symbol table info available.
#2
Hi, yes it can occur on any machine (slave or master) with the same
configuration / OS.
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Title:
slapd enter in
Hi, I went a bit down the rabbit hole Sergio mentioned and found the
same old reports and nothing really useful. I'd also be curios to see if
the problem still occurs with the newer releases.
Did you see this happen on more that one machine/deployment?
The backtrace didn't suggest my anything,
** Attachment removed: "slapd backtrace during sched_yield loop"
https://bugs.launchpad.net/ubuntu/+source/openldap/+bug/1926265/+attachment/5495540/+files/2021070_backtrace_front02_..txt
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** Changed in: openldap (Ubuntu)
Status: Incomplete => New
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Title:
slapd enter in infinite loop on
issue occured today to.
This time, I join a *full* backtrace .
** Attachment added: "2021010_backtrace_front01_FULL.txt"
https://bugs.launchpad.net/ubuntu/+source/openldap/+bug/1926265/+attachment/5496108/+files/2021010_backtrace_front01_FULL.txt
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Nice day, 2 slapd malfunction in the same time, maybe du to network
connectivity issue.
I have the backtrace for one of them.
Please the the attachment.
Thanks.
** Attachment added: "slapd backtrace during sched_yield loop"
Thanks for following up.
It is hard to say what might be happening and whether switching to MDB
will help or not. I'm still puzzled that you're seeing this hang on a
relatively new version of OpenLDAP. The fact that it didn't happen on
Trusty may be helpful when diagnosing the issue, but I
I plan to migrate BDB backend to MDB. Maybe it could help ?
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Title:
slapd enter in infinite loop on sched_yield
Thanks for your support.
> - Your full openldap configuration (please remove any confidential bits, of
> course).
There is lots of ldif files with many private datas. Do you need a particular
configuration ?
> - Any log messages from slapd or related services.
olcLogLevel is "sync stats".
Thank you for taking the time to file a bug report.
This one looks like a rabbit hole :-(. I've also found many (very) old
reports of similar problems, but they all appear to have been fixed a
while ago (before Bionic was released). I even found a possible patch
(from 2005) to fix the issue,
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