On 30-08-2022 23:20, Kathy Zhu via FreeIPA-users wrote:
Hi Team,
We used following to get the number of rwlocks for /usr/sbin/ns-slapd process
in Centos 7.9 to catch deadlocks:
PID=`pidof ns-slapd`
gdb -ex 'set confirm off' -ex 'set pagination off' -ex 'thread apply all bt full'
-ex 'quit' /usr/sbin/ns-slapd $PID |& grep '^#0.*lock' | grep pthread_rwlock |
sort -u
That helped us to detect ns-slapd hang caused by deadlocks.
After migrating to Red Hat 8.6, we had a lot of hangs (dirsvr is running but
not responding) and could not find why. We use the same above method, however,
we are not able to catch anything. I wonder if there is a different way to
count the rwlocks in Red Hat 8.6?
We realize that there are multiple reasons to cause hangs, however, we would
like to rule out the possibility of the deadlock.
The OS and packages:
Red Hat Enterprise Linux release 8.6 (Ootpa)
ipa-server.x86_64 4.9.8-7.module+el8.6.0+14337+19b76db2
@rhel-8-for-x86_64-appstream-rpms
slapi-nis-0.56.6-4.module+el8.6.0+12936+736896b2.x86_64
389-ds-base-libs-1.4.3.28-6.module+el8.6.0+14129+983ceada.x86_64
389-ds-base-1.4.3.28-6.module+el8.6.0+14129+983ceada.x86_64
Hey Kathy,
May I suggest to also look at the 389-users mailing list
389-us...@lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/389-us...@lists.fedoraproject.org
For example threads with subject:
* Lock table is out of available lock entries
* Enabling retro changelog maxage with 3 million entries make dirsrv not
respond anymore
* DB_LOCK_DEADLOCK: Locker killed to resolve a deadlock
I have reported about hangs (deadlocks). In our case when Retro Changelog
trimming
is enabled we get a hangs within a few minutes. As far as I know there is no
solution yet.
That is why we have disabled this trimming. (And our Retro Changelog has
accumulated to more
than Gb of data.)
--
Kees
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