samba 'INTERNAL ERROR: Signal 11' when macOS 10.14.6 connects

Hello,

I am running your docker container on a Raspberry Pi 4 with the following environment:

pi@raspi4:~ $ uname -a
Linux raspi4 4.19.118-v7l+ #1311 SMP Mon Apr 27 14:26:42 BST 2020 armv7l GNU/Linux
pi@raspi4:~ $ docker -v
Docker version 19.03.11, build 42e35e6
pi@raspi4:~ $ cat /sys/firmware/devicetree/base/model
Raspberry Pi 4 Model B Rev 1.1
pi@raspi4:~ $ docker images | grep dperson
dperson/samba       armhf               83e648c2573d        13 days ago         49MB

i ran into the problem, that samba crashes when a macOS 10.14.6 client connects. I then get the following log from the container:

Added user user.
smbd version 4.12.2 started.
Copyright Andrew Tridgell and the Samba Team 1992-2020
daemon_ready: daemon 'smbd' finished starting up and ready to serve connections
===============================================================
INTERNAL ERROR: Signal 11 in pid 46 (4.12.2)
If you are running a recent Samba version, and if you think this problem is not yet fixed in the latest versions, please consider reporting this bug, see https://wiki.samba.org/index.php/Bug_Reporting
===============================================================
PANIC (pid 46): internal error
unable to produce a stack trace on this platform
dumping core in /var/log/samba/cores/smbd

The problem can be reproduced by running

docker run --rm -it -p 139:139 -p 445:445 --name sambatest dperson/samba:armhf -p -u "user;user" -s "Public;/tmp/test;yes;no;no;user"

and let a macOS 10.14.6 client connect to smb://<server>/Public. The error occurs after the password was entered and the Connect button was clicked in macOS.

I tried several things on the mac like

Switch to SMB2
Disable packet signing

as the problem does not occur with my other PC (Ubunut 18.04). But with no luck :-(

See also attached file samba_log_level_2.txt which contains the full log output when log level 2 is activated.

Any Ideas? Thanks in advance for your help!

Jun 12 '20 21:06 m4rc77

I have exactly the same problem on a Raspberry Pi 3 Model B Plus Rev 1.3 using OSX 10.14.6

Jun 18 '20 17:06 aso595

This also happens with permission mask 777 on all files and folders behind the volume.

Hint: the crash possibly occurs only > 11.1.0.4, it could be best to rebuild image from an older version as this is a bug and will take months or more to fix.

Modify Dockerfile with this to install samba from oldest build

apk add samba=4.11.9-r0 --repository=http://dl-cdn.alpinelinux.org/alpine/v3.11/main

Jul 04 '20 10:07 akasandra

I can confirm this resolves the problem.

Jul 04 '20 11:07 akasandra

@matryoshkababushka thanks for your Inputs. I will try this.

Jul 06 '20 08:07 m4rc77

had the same issue. Fixed with https://github.com/m4rc77/samba/commit/448518cb2a39c9fa56986e792d0aa5e683d8b437

I can confirm using samba=4.11.9-r0 as @matryoshkababushka described will work.

Aug 04 '20 15:08 sglogger

I am currently testing the fix in my own environment. Until now it looks fine to me.

The fix m4rc77@448518c from my forked repo https://github.com/m4rc77/samba is available as Docker Image m4rc77/samba from DockerHub just in case someone else desperately needs this fix too. Details see https://hub.docker.com/r/m4rc77/samba and https://hub.docker.com/r/m4rc77/samba/dockerfile

@dperson: Should I create from m4rc77@448518c a pull-request. It would be great if this fix would be for example available as dperson/samba-4.11:armhf but i am not a multi-arch-manifest.yaml specialist and unsure how to do it in detail. And I also do not know how you would like to integrate this fix in your repo (e.g. new branch, ...). Thanks in advance for your inputs.

Aug 04 '20 22:08 m4rc77

Can confirm that samba 4.12.6 which is now in alpine 3.12 repo fixes this issue for me https://pkgs.alpinelinux.org/packages?name=samba&branch=v3.12&arch=x86_64

Just rebuilding dperson/samba without cache was all that I needed to do