Justification for "Severity: serious": Impossible to create mail with
attachments.

Hi,

this applies to both thunderbird 144.0 from experimental and to
1:140.7.1esr-1.

Starting thunderbird gives the following console messsages:

$ thunderbird
[3875175] Sandbox: CanCreateUserNamespace() clone() failure: EACCES
[3875175] Wayland Proxy [0x7fa18e788cf0] Error: StartProxyServer(): bind() error : Permission denied
[GFX1-]: FireTestProcess failed: Failed to spawn child process “/usr/lib/thunderbird/glxtest” (Permission denied)

[GFX1-]: glxtest: ManageChildProcess failed

[GFX1-]: No GPUs detected via PCI

WARNING: Glycin running without sandbox.
[Parent 3875175, Main Thread] WARNING: Could not load a pixbuf from icon theme.
This may indicate that pixbuf loaders or the mime database could not be found.: 'glib warning', file toolkit/xre/nsSigHandlers.cpp:201

(thunderbird:3875175): Gtk-WARNING **: 13:10:32.427: Could not load a pixbuf from icon theme.
This may indicate that pixbuf loaders or the mime database could not be found.
WARNING: Glycin running without sandbox.
WARNING: Glycin running without sandbox.
WARNING: Glycin running without sandbox.
WARNING: Glycin running without sandbox.
WARNING: Glycin running without sandbox.
(continues, tens of times as second)

I then open a new message and click on "attach". Thunderbird crashes
reliably,

WARNING: Glycin running without sandbox.
WARNING: Glycin running without sandbox.
**
Gtk:ERROR:../../../gtk/gtkiconhelper.c:495:ensure_surface_for_gicon: assertion failed (error == NULL): Failed to load /usr/share/icons/breeze-dark/status/16/image-missing.svg: Could not spawn `env -i XDG_RUNTIME_DIR="/run/user/1001" "/usr/libexec/glycin-loaders/2+/glycin-svg" "--dbus-fd" "122"`: Permission denied (os error 13) (gdk-pixbuf-error-quark, 0)
Bail out! Gtk:ERROR:../../../gtk/gtkiconhelper.c:495:ensure_surface_for_gicon: assertion failed (error == NULL): Failed to load /usr/share/icons/breeze-dark/status/16/image-missing.svg: Could not spawn `env -i XDG_RUNTIME_DIR="/run/user/1001" "/usr/libexec/glycin-loaders/2+/glycin-svg" "--dbus-fd" "122"`: Permission denied (os error 13) (gdk-pixbuf-error-quark, 0)
Redirecting call to abort() to mozalloc_abort

ExceptionHandler::GenerateDump attempting to generate:/home/mh/.thunderbird/xqucmwop.default/minidumps/773a2760-f9f2-a32f-9ba4-8f17fea77e77.dmp
ExceptionHandler::GenerateDump cloned child 3875999
ExceptionHandler::SendContinueSignalToChild sent continue signal to child
ExceptionHandler::WaitForContinueSignal waiting for continue signal...
ExceptionHandler::GenerateDump minidump generation succeeded
Exiting due to channel error.
Exiting due to channel error.

Greetings
Mar

Hello Marc

Am 22.02.26 um 14:20 schrieb Marc Haber:

this souds like you have the AppArmore profile enabled.

There is an other bug report filed about issues related to an outdated
AA profile for Thunderbird. Can you please check if the issue ist still
existing with an disabled AA Thunderbird profile?

https://bugs.debian.org/1127710

Control: retitle -1 /etc/apparmor.d/usr.bin.thunderbird: causes crash when trying to attach a file
Control: affects -1 + src:apparmor
...

This is another symptom of the same root cause as
<https://bugs.debian.org/1127710>: thunderbird's AppArmor profile
prevents gdk-pixbuf / glycin / bwrap from working as designed, by
denying permission to do operations that they need. A workaround is to
put thunderbird's AppArmor profile in "complain" (non-enforcing) mode,
making it no longer a security boundary:

     aa-complain /etc/apparmor.d/usr.bin.thunderbird

or disable it completely.

Thunderbird's AppArmor profile is already disabled by default (see
https://salsa.debian.org/mozilla-team/thunderbird/-/blob/debian/sid/debian/README.apparmor)
"because it has to break a number of common use cases in order to
provide meaningful application confinement". Now that gdk-pixbuf uses
glycin, that list of common use cases is much longer than it used to be.

Based on discussion in https://bugs.debian.org/1127710 it seems that the
most likely resolution for this issue will be to remove the AppArmor
profile completely.

     smcv

Downgrading as workaround available.

Yes, I confirm that this helps. What also helps is GTK_USE_PORTAL=1 (the
KDE launcher does that).

Greetings
Marc

Downgrading as workaround available.

Yes, I confirm that this helps. What also helps is GTK_USE_PORTAL=1 (the
KDE launcher does that).

Greetings
Marc

We believe that the bug you reported is fixed in the latest version of
thunderbird, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1128672@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Carsten Schoenert <c.schoenert@t-online.de> (supplier of updated thunderbird package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Mon, 22 Jun 2026 21:41:06 +0200
Source: thunderbird
Architecture: source
Version: 1:152.0-1
Distribution: experimental
Urgency: medium
Maintainer: Carsten Schoenert <c.schoenert@t-online.de>
Changed-By: Carsten Schoenert <c.schoenert@t-online.de>
Closes: 880424 882218 883245 900210 909281 914403 917613 928178 949450 949649 955380 961269 1127710 1128672 1128876 1138513
Changes:
 thunderbird (1:152.0-1) experimental; urgency=medium
 .
   [ Carsten Schoenert ]
   * [5097e09] d/control: Bump B-D for libnss3-dev
   * [5350030] New upstream version 152.0
     (Closes: #1138513)
   * [92962df] Rebuild patch queue from patch-queue branch
     Removed patch (included upstream):
     fixes/Fix-conflicting-types-for-once_flag-and-call_once-with-gl.patch
     fixes/Fix-math_private.h-for-i386-FTBFS.patch
     fixes/Fix-sandbox-to-build-with-glibc-2.43.patch
   * [46de392] d/mozconfig.default: Remove option --enable-av1
 .
   [ Christoph Goehre ]
   * [5308430] rebuild patch queue from patch-queue branch (Closes: #1128876)
 .
   [ intrigeri ]
   * [77d16c3] Don't install AppArmor policy anymore
     (Closes: #1128672, #1127710, #928178, #909281, #955380, #882218, #900210,
      #914403, #917613, #949450, #880424, #883245, #961269, #949649)
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Files:
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 d435a5b441fa39456dfa21b01881fdf3 537512 mail optional thunderbird_152.0-1.debian.tar.xz
 20c10b422095bf9f1d461c01e152c30e 40158 mail optional thunderbird_152.0-1_amd64.buildinfo
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