[Pkg-clamav-devel] Possible (grave) bug in clamav-daemon

[Florian Pelgrim]

Hello maintainers,

I'm running debian stretch with clamav-daemon and amavisd-new.

After installing the package clamav-daemon and configuring amavisd-new 
to use the av scanner  it leads into an unusable mail setup.

 From /var/log/clamav/clamav.log
WARNING: lstat() failed on: /var/lib/amavis/tmp/afXXXXqi4S6v/parts

The permissions on the folder are looking good to me
$ ls -al /var/lib/amavis/tmp/
total 20
drwxrwx--- 5 amavis amavis  4096 Feb  7 04:16 .
drwxr-x--- 6 amavis amavis  4096 Feb  7 03:39 ..
drwxr-x--- 3 amavis postfix 4096 Feb  7 04:16 afXXXXj0mr9n
drwxr-x--- 3 amavis postfix 4096 Feb  7 04:16 afXXXXSJQLBy
drwxr-x--- 2 amavis postfix 4096 Feb  7 04:16 afXXXXwzIeVe

I tried now several things to fix it but end up with no solution. So 
before I open a bug report I was hoping you would point me to something 
stupid I have done or forgotten. :)

1. I added clamav to the group amavis and amavis to the group clamav

$ groups amavis
amavis : amavis mail clamav
$ groups clamav
clamav : clamav amavis

2. I hot patched the systemd service script to run clamav with the group 
amavis
[...]
Group=amavis
User=clamav
[...]

3 I know that `AllowSupplementaryGroups` is deprecated and will not help 
anymore. I tried it anyway but yeah. No success.

The system is fresh setup debian stretch with no outstanding updates.
Anyone of you an idea what I'm missing or do I really have to open a bug 
report? ;)

Cheers
Flo