Hi Mark,

thank you for the info.


Here is the gdb bt output (but no stack!):

sudo gdb /usr/libexec/colord-sane
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Reading symbols from /usr/libexec/colord-sane...
Reading symbols from
/usr/lib/debug/.build-id/e3/9900f1973b9caa55e3c7b876fc84282d7f52c6.debug...
(gdb) bt
❌️ No stack.
(gdb)

here is dmesg output:

[  748.424559] usb 1-7.3: new high-speed USB device number 6 using xhci_hcd
[  748.559929] usb 1-7.3: New USB device found, idVendor=18d1,
idProduct=4ee1, bcdDevice= 6.01
[  748.559936] usb 1-7.3: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[  748.559939] usb 1-7.3: Product: Pixel 9a
[  748.559942] usb 1-7.3: Manufacturer: Google
[  748.559944] usb 1-7.3: SerialNumber: hidden
[  749.702977] show_signal_msg: 112 callbacks suppressed
[  749.702981] colord-sane[3340]: segfault at 0 ip 00007f25fb56ad59 sp
00007ffd4b7892a8 error 4 in libc.so.6[16ad59,7f25fb428000+168000] likely
on CPU 5 (core 5, socket 0)
[  749.702994] Code: 77 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00
89 f8 48 89 fa c5 f9 ef c0 25 ff 0f 00 00 3d e0 0f 00 00 0f 87 37 01 00
00 <c5> fd 74 0f c5 fd d7 c1 85 c0 74 5b f3 0f bc c0 c5 f8 77 c3 0f 1f


and here is colormgr get-devices output:

colormgr get-devices
Object Path:
 /org/freedesktop/ColorManager/devices/cups_HP_LaserJet_1320_series
Owner:         root
Created:       Januar 19 2026, 01:40:40 PM
Modified:      Januar 19 2026, 01:40:40 PM
Type:          printer
Enabled:       Yes
Embedded:      No
Model:         HP LaserJet 1320 Series
Vendor:        Hewlett Packard
Serial:        00CNHW59NG0B
Format:        ColorModel.MediaType.Resolution
Scope:         temp
Colorspace:    gray
Device ID:     cups-HP_LaserJet_1320_series
Profile 1:     HP_LaserJet_1320_series-Gray..
Metadata:      OwnerCmdline=/usr/sbin/cupsd -f

Object Path:
 /org/freedesktop/ColorManager/devices/xrandr_Dell_DELL_U2722D_H6D71P3_reiner_1000
Owner:         reiner
Created:       Januar 19 2026, 01:41:38 PM
Modified:      Januar 19 2026, 01:41:39 PM
Type:          display
Enabled:       Yes
Embedded:      No
Model:         DELL U2722D
Vendor:        Dell
Serial:        H6D71P3
Scope:         temp
Colorspace:    rgb
Device ID:     xrandr-Dell-DELL U2722D-H6D71P3
Profile 1:     icc-9d9873e81713992cbc5153f210dea082
               /home/reiner/.local/share/icc/U2722D #1 2023-12-08 22-40
D6500 2.2 F-S XYZLUT+MTX.icc
Metadata:      OutputEdidMd5=60fc5bebefb8ba33810b089b6fbc5459
Metadata:      OutputPriority=secondary
Metadata:      XRANDR_name=DisplayPort-0
Metadata:      OwnerCmdline=xiccd

Object Path:  /org/freedesktop/ColorManager/devices/sysfs_Google_Pixel_9a
Owner:         root
Created:       Januar 19 2026, 01:52:59 PM
Modified:      Januar 19 2026, 01:52:59 PM
Type:          camera
Enabled:       Yes
Embedded:      Yes
Model:         Pixel 9a
Vendor:        Google
Serial: /sys/devices/pci0000:00/0000:00:02.1/0000:01:00.0/usb1/1-7/1-7.3
Seat:          seat0
Colorspace:    rgb
Device ID:     sysfs-Google-Pixel_9a


Pixel 9a is seen in the file-manager thunar, but no mount possible.


regards

Reiner



Am 19.01.26 um 13:06 schrieb Mark Hindley:
> Reiner,
>
> On Mon, Jan 19, 2026 at 12:40:07PM +0100, Reiner wrote:
>> you are right, it is freia. I'm new to devuan and a long time debian user;-)
> Welcome!
>
>> I'm not familiar with gdb or gdb backtrace. Assuming one has to start
>> manually a debug version of
> The basic contents of Debian Wiki[1] are still relevant, with the exception of
> systemd-specific material. The dbgsym packages for forked packages are in
> Devuan's main archive.
>
>> If you can give me a short guide what to do, than I can try to make a gdb
>> backtrace.
> I would start with something like:-
>
> 1. Install colord-dbgsym
>

>      apt install colord-dbgsym

>
> 2. Ensure colord-sane is not running
>

>      pkill colord-sane

>
> 3. Unplug the triggering USB phone/device
>
> 4. Start colord-sane under gdb
>

>      sudo gdb /usr/libexec/colord-sane

>
> 5. Plug in the segfault triggering device
>
> 6. Hopefully gdb will catch the segfault and you can run
>

>      bt

>
> Feel free to try irc://libera.chat/#devuan-dev if you need more help.
>
> Mark
>
> [1] https://wiki.debian.org/HowToGetABacktrace