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clutter: Bail out and warn on reentry into mapping/unmapping cycle

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There's a bunch of crashes right now where the assertions in
clutter_actor_set_mapped() after calling the map/unmap() vfuncs are
failing. The only way this can happen is by re-entering
clutter_actor_set_mapped() during the map/unmap recursion.

The reason for those crashes is that the shell hides/shows some actors
in response to crossing events and key-focus changes. These in turn get
triggered by the newly introduced ungrabbing of ClutterGrabs when an
actor gets unmapped, which triggers GRAB_NOTIFY crossing events and
key-focus changes.

Since these situations are hardly avoidable (it's a valid use-case to
hide/show something in response to a crossing/key-focus event), catch
the set_mapped() call early while we reenter the mapping machinery and
log a warning instead of crashing.

Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3165
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2299>
This commit is contained in:
Jonas Dreßler 2022-02-16 22:34:12 +01:00 committed by Marge Bot
parent 4a865424cd
commit c64803770e
2 changed files with 9 additions and 0 deletions
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6
clutter/clutter/clutter-actor.c
View File

@ -1264,6 +1264,10 @@ clutter_actor_set_mapped (ClutterActor *self,
if (CLUTTER_ACTOR_IS_MAPPED (self) == mapped)
return;
g_return_if_fail (!CLUTTER_ACTOR_IN_MAP_UNMAP (self));
CLUTTER_SET_PRIVATE_FLAGS (self, CLUTTER_IN_MAP_UNMAP);
if (mapped)
{
CLUTTER_ACTOR_GET_CLASS (self)->map (self);
@ -1274,6 +1278,8 @@ clutter_actor_set_mapped (ClutterActor *self,
CLUTTER_ACTOR_GET_CLASS (self)->unmap (self);
g_assert (!CLUTTER_ACTOR_IS_MAPPED (self));
}
CLUTTER_UNSET_PRIVATE_FLAGS (self, CLUTTER_IN_MAP_UNMAP);
}
/* this function updates the mapped and realized states according to

3
clutter/clutter/clutter-private.h
View File

@ -69,6 +69,7 @@ typedef struct _ClutterMainContext ClutterMainContext;
#define CLUTTER_ACTOR_IN_PREF_WIDTH(a) ((CLUTTER_PRIVATE_FLAGS (a) & CLUTTER_IN_PREF_WIDTH) != FALSE)
#define CLUTTER_ACTOR_IN_PREF_HEIGHT(a) ((CLUTTER_PRIVATE_FLAGS (a) & CLUTTER_IN_PREF_HEIGHT) != FALSE)
#define CLUTTER_ACTOR_IN_PREF_SIZE(a) ((CLUTTER_PRIVATE_FLAGS (a) & (CLUTTER_IN_PREF_HEIGHT|CLUTTER_IN_PREF_WIDTH)) != FALSE)
#define CLUTTER_ACTOR_IN_MAP_UNMAP(a) ((CLUTTER_PRIVATE_FLAGS (a) & CLUTTER_IN_MAP_UNMAP) != FALSE)
#define CLUTTER_PARAM_READABLE (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)
#define CLUTTER_PARAM_WRITABLE (G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS)
@ -105,6 +106,8 @@ typedef enum
/* Used to avoid recursion */
CLUTTER_IN_RELAYOUT = 1 << 7,
CLUTTER_IN_MAP_UNMAP = 1 << 8,
} ClutterPrivateFlags;
/*