This comes from ensure_x11_unix_perms, which is determining that the
/tmp/.X11-unix does not have at least permission bits 022:
--->
static gboolean
ensure_x11_unix_perms (GError **error)
{
/* Try to detect systems on which /tmp/.X11-unix is owned by neither root nor
* ourselves because in that case the owner can take over the socket we create
* (symlink races are fixed in linux 800179c9b8a1). This should not be
* possible in the first place and systems should come with some way to ensure
* that's the case (systemd-tmpfiles, polyinstantiation …).
*
* That check however only works if we see the root user namespace which might
* not be the case when running in e.g. toolbx (root and other user are all
* mapped to overflowuid). */
struct stat x11_tmp, tmp;
if (lstat (X11_TMP_UNIX_DIR, &x11_tmp) != 0)
{
g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errno),
"Failed to check permissions on directory \"%s\": %s",
X11_TMP_UNIX_DIR, g_strerror (errno));
return FALSE;
}
if (lstat (TMP_UNIX_DIR, &tmp) != 0)
{
g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errno),
"Failed to check permissions on directory \"%s\": %s",
TMP_UNIX_DIR, g_strerror (errno));
return FALSE;
}
/* If the directory already exists, it should belong to the same
* user as /tmp or belong to ourselves ...
* (if /tmp is not owned by root or ourselves we're in deep trouble) */
if (x11_tmp.st_uid != tmp.st_uid && x11_tmp.st_uid != getuid ())
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_PERMISSION_DENIED,
"Wrong ownership for directory \"%s\"",
X11_TMP_UNIX_DIR);
return FALSE;
}
/* ... be writable ... */
if ((x11_tmp.st_mode & 0022) != 0022)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_PERMISSION_DENIED,
"Directory \"%s\" is not writable",
X11_TMP_UNIX_DIR);
return FALSE;
}
<---
So the bug is not in Mutter.
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/2069564
Title:
gnome-shell crashed with SIGTRAP in meta_wayland_compositor_new() from
meta_context_start() from main() ["Failed to start X Wayland:
Directory \"/tmp/.X11-unix\" is not writable"]
Status in gnome-shell package in Ubuntu:
Confirmed
Status in mutter package in Ubuntu:
Confirmed
Bug description:
The Ubuntu Error Tracker has been receiving reports about a problem regarding
gnome-shell. This problem was most recently seen with package version
46.0-0ubuntu5.1, the problem page at
https://errors.ubuntu.com/problem/a7dbd55723a8ea326d1ccf32e31fe307151786c2
contains more details, including versions of packages affected, stacktrace or
traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software
developer, you can request it at http://forms.canonical.com/reports/.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/2069564/+subscriptions
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