[bluez/bluez] 03f0f6: obexd: Reference count the phonebook back-end setu...

[Paul Menzel <noreply@github.com>]

  Branch: refs/heads/1147292
  Home:   https://github.com/bluez/bluez
  Commit: 03f0f67b8b04b464cb99f8d8f2f7e5543508be35
      https://github.com/bluez/bluez/commit/03f0f67b8b04b464cb99f8d8f2f7e5543508be35
  Author: Paul Menzel <pmenzel@molgen.mpg.de>
  Date:   2026-08-17 (Mon, 17 Aug 2026)

  Changed paths:
    M Makefile.obexd
    M obexd/plugins/phonebook-dummy.c
    M obexd/plugins/phonebook-ebook.c
    M obexd/plugins/phonebook-tracker.c
    A obexd/plugins/phonebook.c
    M obexd/plugins/phonebook.h

  Log Message:
  -----------
  obexd: Reference count the phonebook back-end setup and teardown

Stopping obexd on Debian sid/unstable with *bluez* 5.87-1 logs a GObject
critical:

    obexd[10687]: Terminating
    systemd[1804]: Stopping obex.service - Bluetooth OBEX service...
    obexd[10687]: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
    systemd[1804]: Stopped obex.service - Bluetooth OBEX service.

Two builtin plugins use the phonebook back-end: pbap (pbap_init() at
obexd/plugins/pbap.c:962, pbap_exit() at :1002) and irmc (irmc_init() at
obexd/plugins/irmc.c:446, irmc_exit() at :473). Each calls phonebook_init()
when it is loaded and phonebook_exit() when it is unloaded, but neither the
callers nor the back-end track ownership of the singleton they share.
plugin_init() therefore sets the back-end up twice and plugin_cleanup()
tears it down twice. A gdb trace of the shutdown path confirms both pairs
of calls.

The dummy back-end tolerates this by accident: phonebook_init() bails out
early when root_folder is already set, and the second phonebook_exit() only
repeats a g_free()/NULL assignment. The ebook back-end, which Debian builds
(*bluez-obexd* depends on *libebook-1.2* and *libedataserver*), does not.
Its phonebook_init() stores three GObject references in static variables
and phonebook_exit() unconditionally drops all three, so the second
teardown unrefs objects that were already finalized. The registry and the
address book are effectively singletons in evolution-data-server and merely
gain a second reference, but e_book_client_connect_sync() hands back a
fresh client on every call, so the first client leaks and the second one is
unreffed twice – hence a single critical rather than three.

Put the ownership tracking in one place instead of duplicating it in every
back-end: phonebook_init() and phonebook_exit() now live in a new shared
obexd/plugins/phonebook.c and reference count the back-end, so only the
first init and the last exit reach it. The back-end entry points are
renamed to phonebook_driver_init()/phonebook_driver_exit() so that they
cannot be called directly by mistake.

Assisted-by: Claude Code:claude-opus-5



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