xcp-ng server crashed/rebooted due to issues with drbd/linstor?
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I was just moving around the velero backup schedules when it decided to run some again even though it was not time. Crashed xen04 this time. Deleting the possible offending backup schedule until this bug can be identified and fixed.
Uploaded new bug bundle to nextcloud too.
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Logs from xen04 look like they are the same too. Which makes sense.
20:01:53.805: The Linstor DeviceManager on xen04 triggered an asynchronous alignment for a newly created volume (pvc-fac0a18b-2c23-4fe8-b005-b4f492cec92f), padding it from 26220040 KiB to 26222592 KiB. 20:01:54.034: Simultaneously, an orchestrator (like Velero) began tearing the volume down, shifting the DRBD state to conn( Connected -> TearDown ) and pdsk( Diskless -> DUnknown ). 20:01:58.484: The DRBD worker thread evaluated the shrinking bitmap while the alignment was trying to alter it. This caused the general protection fault: 0000 [#1] SMP NOPTI at instruction RIP: e030:drbd_bm_count_bits+0x223/0x300 [drbd], crashing the kernel. -
That timeline is the clearest version of this yet. xen04 going down the same way as xen05 makes the race look real to me rather than coincidental, unless I am reading the ordering wrong.
The fault lands insidedrbd_bm_count_bits, so in the DRBD module itself, which makes me think this is an upstream LINBIT question as much as an XCP-ng one. I do not know enough about how that module gets packaged here to say who owns the fix though. Might be worth another mention to @Team-Storage so someone can open your bundles with your post #10 next to them.
On the padding idea I am out of my depth: no idea whether LINSTOR can be told to pre-round a volume at creation, but asking LINBIT directly seems worth a try since it would sidestepdrbd_bm_resizeentirely.
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@jonathon are you using your LINSTOR/DRBD stack in the form of licensed XOSTOR? Your issue looks a case for pro support. Did you consider opening a case with pro support?
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@MajorP93 No we do not have pro support at the moment
hmmm. Really seems like a build with
9.2.19could fix all of this.
How can I request for a build @poddingue ?https://github.com/LINBIT/drbd/blob/drbd-9.2.19/ChangeLog#L61
9.2.17- Fix a kernel crash triggered by a crafted/invalid netlink message
https://github.com/LINBIT/drbd/blob/drbd-9.2.19/ChangeLog#L24
9.2.19- Fix an AB-BA deadlock between online resize and activity-log transactions
- Fix several races during connection teardown that could crash or
hang (ack_sender requeue, pending ping work, in-progress lb-tcp
connect)
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On the version question, 8.3 ships DRBD 9.2.18 right now (that's what
kmod-drbd.specsays on the 8.3 branch), so you'd be asking for a single point bump rather than a big jump.
That probably helps you. Of your two links though, I think the netlink crash fix is a 9.2.17 entry, which would mean it's already in what you're running.
The 9.2.19 line that looks closest to your crash to me is the connection-teardown races one rather than the AB-BA deadlock, since a deadlock would hang rather than throw a GPF, but you've read these traces far more closely than I have so correct me if that's backwards.
I can't request a build myself, that's a @Team-Storage call rather than mine, though your post #13 timeline next to those changelog lines is a stronger case than most version-bump requests turn up with. -
@poddingue I'm fully up to date, but only at version
9.2.16[14:57 ovbh-pprod-xen02 ~]# drbdadm --version DRBDADM_BUILDTAG=GIT-hash:\ 71c8bcff6ea77a022b272a7eba649a774251bac4\ build\ by\ @buildsystem\,\ 2025-11-03\ 10:21:36 DRBDADM_API_VERSION=2 DRBD_KERNEL_VERSION_CODE=0x090210 DRBD_KERNEL_VERSION=9.2.16 DRBDADM_VERSION_CODE=0x092100 DRBDADM_VERSION=9.33.0 [14:57 ovbh-pprod-xen02 ~]# drbd-reactor --version drbd-reactor 1.9.0 [14:57 ovbh-pprod-xen02 ~]#
There are no updates that I can install
[14:08 ovbh-pprod-xen02 ~]# yum check-update Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile Excluding mirror: updates.xcp-ng.org * xcp-ng-base: mirrors.xcp-ng.org Excluding mirror: updates.xcp-ng.org * xcp-ng-updates: mirrors.xcp-ng.org zabbix | 3.0 kB 00:00:00 zabbix-non-supported | 2.9 kB 00:00:00 zabbix/x86_64/primary_db | 114 kB 00:00:00 zabbix-agent.x86_64 7.0.28-release1.el7 zabbix -
For now I have upgraded all hosts to use
--enablerepo=xcp-ng-linstor-testingto getkmod-drbd.x86_64 0:9.2.18-2.0.xcpng8.3
That way it is there to be picked up if the host crashes again.
https://github.com/xcp-ng-rpms/drbd/blob/master/SPECS/kmod-drbd.spec
https://koji.xcp-ng.org/buildinfo?buildID=5747[12:15 ovbh-pprod-xen04 ~]# yum upgrade --enablerepo=xcp-ng-linstor-testing Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile Excluding mirror: updates.xcp-ng.org * xcp-ng-base: mirrors.xcp-ng.org Excluding mirror: updates.xcp-ng.org * xcp-ng-updates: mirrors.xcp-ng.org grafana/signature | 810 B 00:00:00 grafana/signature | 3.0 kB 00:00:00 !!! xcp-ng-linstor-testing/signature | 473 B 00:00:00 xcp-ng-linstor-testing/signature | 3.0 kB 00:00:00 !!! zabbix | 3.0 kB 00:00:00 zabbix-non-supported | 2.9 kB 00:00:00 (1/3): grafana/primary_db | 879 kB 00:00:00 (2/3): xcp-ng-linstor-testing/primary_db | 2.4 kB 00:00:00 (3/3): zabbix/x86_64/primary_db | 114 kB 00:00:00 Resolving Dependencies --> Running transaction check ---> Package kmod-drbd.x86_64 0:9.2.16-1.0.xcpng8.3 will be updated ---> Package kmod-drbd.x86_64 0:9.2.18-2.0.xcpng8.3 will be an update ---> Package zabbix-agent.x86_64 0:7.0.27-release1.el7 will be updated ---> Package zabbix-agent.x86_64 0:7.0.28-release1.el7 will be an update --> Finished Dependency Resolution Dependencies Resolved ============================================================================================================================================================================================================================================================== Package Arch Version Repository Size ============================================================================================================================================================================================================================================================== Updating: kmod-drbd x86_64 9.2.18-2.0.xcpng8.3 xcp-ng-linstor-testing 2.8 M zabbix-agent x86_64 7.0.28-release1.el7 zabbix 660 k Transaction Summary ============================================================================================================================================================================================================================================================== Upgrade 2 Packages Total download size: 3.4 M Is this ok [y/d/N]: y Downloading packages: Delta RPMs disabled because /usr/bin/applydeltarpm not installed. (1/2): zabbix-agent-7.0.28-release1.el7.x86_64.rpm | 660 kB 00:00:00 (2/2): kmod-drbd-9.2.18-2.0.xcpng8.3.x86_64.rpm | 2.8 MB 00:00:01 -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Total 2.8 MB/s | 3.4 MB 00:00:01 Running transaction check Running transaction test Transaction test succeeded Running transaction Updating : kmod-drbd-9.2.18-2.0.xcpng8.3.x86_64 1/4 Updating : zabbix-agent-7.0.28-release1.el7.x86_64 2/4 Cleanup : kmod-drbd-9.2.16-1.0.xcpng8.3.x86_64 3/4 Cleanup : zabbix-agent-7.0.27-release1.el7.x86_64 4/4 Verifying : zabbix-agent-7.0.28-release1.el7.x86_64 1/4 Verifying : kmod-drbd-9.2.18-2.0.xcpng8.3.x86_64 2/4 Verifying : kmod-drbd-9.2.16-1.0.xcpng8.3.x86_64 3/4 Verifying : zabbix-agent-7.0.27-release1.el7.x86_64 4/4 Updated: kmod-drbd.x86_64 0:9.2.18-2.0.xcpng8.3 zabbix-agent.x86_64 0:7.0.28-release1.el7 Complete! -
Oopsie, I was wrong.
I owe you a correction on the version, and that one is on me. I said 8.3 ships 9.2.18, but I was reading the spec file on the branch rather than what you actually get from the stable repo.
Your yum check-update output answers it better than I did: stable leaves you on 9.2.16, and 9.2.18 only turns up once xcp-ng-linstor-testing is enabled.The screenshot in that same post is the part the still puzzles me. XO says "All good, patches up to date" while the module underneath is two point releases back, which I assume is what everyone else running XOSTOR sees too. If the connection-teardown fixes you found really are in 9.2.19, that is three releases of distance on the exact code path your traces land in, not the single bump I described.
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Hello,
Indeed this is a known issue with XOSTOR, when causing a sync of too many resources at once it's possible for a DRBD resource to leak memory during the resync. A patch on the 9.2.18 fixes this by throttling the number of resources that can be synced at once to mitigate the issue.
The 9.2.18 update should be in the main xcp-ng-linstor repo very soon.
What you can do too is give more RAM to the dom0 of your hosts. How many RAM have been allocated to dom0 at the moment? We advise 16GB or 32GB depending on the number of volumes.
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@Mathieu-L https://xcp-ng.org/forum/post/106873 I had increased it to 16G and it still crashed.
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