Core files were found: smbd.core - SMD service down

Software & Web Applications
1

This happens the second time now:

New alerts:
* The following system core files were found: smbd.core. Please create a ticket
at https://ixsystems.atlassian.net/ and attach the relevant core files along
with a system debug. Once the core files have been archived and attached to
the ticket, they may be removed by running the following command in shell: ‘rm
/var/db/system/cores/*’.

I can see that the /var volume is small

Filesystem Size Used Avail Capacity Mounted on
boot-pool/ROOT/13.0-U6.8 5.5G 1.3G 4.2G 24% /
devfs 1.0K 1.0K 0B 100% /dev
tmpfs 32M 9.5M 22M 30% /etc
tmpfs 4.0M 8.0K 4.0M 0% /mnt
tmpfs 2.6G 2.6G 0B 100% /var
fdescfs 1.0K 1.0K 0B 100% /dev/fd

and full with config DBs:
/var/db/system/configs-…

18.2 MiB [##################] /TrueNAS-12.0-U8.1
18.0 MiB [################# ] /TrueNAS-13.0-U6.7
16.0 MiB [############### ] /TrueNAS-13.0-U6.1
12.6 MiB [############ ] /TrueNAS-13.0-U5.3
9.4 MiB [######### ] /TrueNAS-13.0-U4
7.3 MiB [####### ] /TrueNAS-13.0-U6.2
6.5 MiB [###### ] /TrueNAS-13.0-U6.8
5.5 MiB [##### ] /TrueNAS-12.0-U8
4.4 MiB [#### ] /TrueNAS-13.0-U5.2
4.1 MiB [#### ] /TrueNAS-13.0-U6.4

Is this normal?

I have no idea why smbd has crashed. A reboot helped last time but the problem came back roughly after 1 week.

I am seeing a lot of No space left on device and NT_STATUS_DISK_FULL in log.smbd

The pool volumes are far from 100% full.
/var/run/samba/fd is at 100%.

Any ideas?

2

I moved myself and many client off of Core as while back so I don’t have a reference system to look at, but I would dig deeper into the samba logs to hopefully find the cause.

3

@xerxes, I dont know what the issue is but my /var is just 1%. This is Truenas Core 13.0

root@truenas[~]# df
Filesystem                                               1K-blocks     Used  Avail Capacity  Mounted on
boot-pool/ROOT/13.0-U6.8                                  11756408  1575736    10180672    13%    /
devfs                                                            1        1      0   100%    /dev
tmpfs                                                        32768    10460  22308    32%    /etc
tmpfs                                                         4096        8   4088     0%    /mnt
tmpfs                                                      5565764    378165527948     1%    /var
fdescfs                                                          1        1      0   100%    /dev/fd
zpool                                                  22441014686      151 22441014535     0%    /mnt/zpool
zpool/share                                            22532769648 91755113 22441014535     0%    /mnt/zpool/share
zpool/.system                                          22441014709      174 22441014535     0%    /var/db/system
zpool/.system/cores                                        1048576      1391048436     0%    /var/db/system/cores
zpool/.system/samba4                                   22441015285      750 22441014535     0%    /var/db/system/samba4
zpool/.system/syslog-342111fac902458e8468ba3ccee40d16  22441026782    12247 22441014535     0%    /var/db/system/syslog-342111fac902458e8468ba3ccee40d16
zpool/.system/rrd-342111fac902458e8468ba3ccee40d16     22441089998    75463 22441014535     0%    /var/db/system/rrd-342111fac902458e8468ba3ccee40d16
zpool/.system/configs-342111fac902458e8468ba3ccee40d16 22441132854   118319 22441014535     0%    /var/db/system/configs-342111fac902458e8468ba3ccee40d16
zpool/.system/webui                                    22441014674      139 22441014535     0%    /var/db/system/webui
zpool/.system/services                                 22441014674      139 22441014535     0%    /var/db/system/services
fdescfs                                                          1        1      0   100%    /var/run/samba/fd
4

Thank you, the weird thing is that I cannot find the files that are taking up that much space…

I had this once with a VM when some nfs mounts did work, the system wrote to the local fs. Later when the NFS mount worked, the local data was hidden “under” the mounted nfs share…

5

Hi @xerxes! I assume you are using current TrueCommand 3.2. I’m just started testing this soft since december 2025 (Local Installation, not Cloud service). I have 4 same TrueNAS Core 13 installation and 2 of them was connected to TrueCommand. Every 2-4 weeks this 2 servers have samba service crashed with your sympthoms. And yes, tmpfs mounted to /var space is exhausted. Restart is my solutions. 2 another system (without TrueCommand connect) have uptime to one year. So i think it’s a bug of current TrueCommand. System, based on TrueNAS 25.10 don’t have this bug.

So my solution - i will not used control soft that can crash controled systems. Will see to Zabix side…