Hello, I am working on an embedded device with Bluez 5.54. My bluez init script for the bluetoothd demon : # cat /etc/init.d/S19_bluez #!/bin/sh start() { echo -n "Starting $0: " #bluetoothd -dE& echo "Done." } (...) To initialize my hci0, we are using btmgmt : /usr/bin/btmgmt -i hci0 power off /usr/bin/btmgmt -i hci0 le on /usr/bin/btmgmt -i hci0 bredr on /usr/bin/btmgmt -i hci0 connectable on /usr/bin/btmgmt -i hci0 bondable on /usr/bin/btmgmt -i hci0 discov on /usr/bin/btmgmt -i hci0 name XXXXX-HEADBAND-V2 /usr/bin/btmgmt -i hci0 advertising on /usr/bin/btmgmt -i hci0 power on Log from bluetoothd: # valgrind --leak-check=no --show-reachable=no --show-possibly-lost=no --track-origins=yes bluetoothd -dEn ==237== Memcheck, a memory error detector ==237== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al. ==237== Using Valgrind-3.14.0 and LibVEX; rerun with -h for copyright info ==237== Command: bluetoothd -dEn ==237== ==237== Invalid read of size 4 ==237== at 0x4005458: _dl_get_ready_to_run (in /lib/ld-uClibc-1.0.31.so) ==237== Address 0x7dffc934 is on thread 1's stack ==237== 20 bytes below stack pointer ==237== ==237== Invalid read of size 4 ==237== at 0x4B05AB8: __uClibc_main (in /lib/libuClibc-1.0.31.so) ==237== Address 0x7dffcbec is on thread 1's stack ==237== 20 bytes below stack pointer ==237== bluetoothd[237]: Bluetooth daemon 5.54 bluetoothd[237]: src/main.c:parse_config() parsing /etc/bluetooth/main.conf bluetoothd[237]: src/main.c:parse_config() Key file does not have key “DiscoverableTimeout” in group “General” bluetoothd[237]: src/main.c:parse_config() Key file does not have key “AlwaysPairable” in group “General” bluetoothd[237]: src/main.c:parse_config() Key file does not have key “PairableTimeout” in group “General” bluetoothd[237]: src/main.c:parse_config() Key file does not have key “Privacy” in group “General” bluetoothd[237]: src/main.c:parse_config() Key file does not have key “JustWorksRepairing” in group “General” bluetoothd[237]: src/main.c:parse_config() name=XXXXX-HEADBAND-V2 bluetoothd[237]: src/main.c:parse_config() Key file does not have key “Class” in group “General” bluetoothd[237]: src/main.c:parse_config() Key file does not have key “DeviceID” in group “General” bluetoothd[237]: src/main.c:parse_config() Key file does not have key “ReverseServiceDiscovery” in group “General” bluetoothd[237]: src/main.c:parse_config() Key file does not have group “GATT” bluetoothd[237]: src/main.c:parse_config() Key file does not have group “GATT” bluetoothd[237]: src/main.c:parse_config() Key file does not have group “GATT” bluetoothd[237]: src/main.c:parse_config() Key file does not have group “GATT” bluetoothd[237]: src/adapter.c:adapter_init() sending read version command bluetoothd[237]: Starting SDP server bluetoothd[237]: src/sdpd-service.c:register_device_id() Adding device id record for 0002:1d6b:0246:0536 bluetoothd[237]: src/plugin.c:plugin_init() Loading builtin plugins bluetoothd[237]: src/plugin.c:add_plugin() Loading hostname plugin bluetoothd[237]: src/plugin.c:add_plugin() Loading wiimote plugin bluetoothd[237]: src/plugin.c:add_plugin() Loading autopair plugin bluetoothd[237]: src/plugin.c:add_plugin() Loading policy plugin bluetoothd[237]: src/plugin.c:add_plugin() Loading network plugin bluetoothd[237]: src/plugin.c:add_plugin() Loading input plugin bluetoothd[237]: src/plugin.c:add_plugin() Loading hog plugin bluetoothd[237]: src/plugin.c:add_plugin() Loading gap plugin bluetoothd[237]: src/plugin.c:add_plugin() Loading scanparam plugin bluetoothd[237]: src/plugin.c:add_plugin() Loading deviceinfo plugin bluetoothd[237]: src/plugin.c:plugin_init() Loading plugins /usr/lib/bluetooth/plugins bluetoothd[237]: profiles/input/suspend-none.c:suspend_init() bluetoothd[237]: profiles/network/manager.c:read_config() Config options: Security=true bluetoothd[237]: Failed to open RFKILL control device bluetoothd[237]: src/main.c:main() Entering main loop bluetoothd[237]: Bluetooth management interface 1.9 initialized bluetoothd[237]: src/adapter.c:read_version_complete() sending read supported commands command bluetoothd[237]: src/adapter.c:read_version_complete() sending read index list command bluetoothd[237]: src/adapter.c:read_commands_complete() Number of commands: 61 bluetoothd[237]: src/adapter.c:read_commands_complete() Number of events: 34 bluetoothd[237]: src/adapter.c:read_commands_complete() enabling kernel-side connection control bluetoothd[237]: src/adapter.c:read_index_list_complete() Number of controllers: 0 bluetoothd[237]: src/adapter.c:index_added() index 0 bluetoothd[237]: src/adapter.c:btd_adapter_new() System name: XXXXXX-HEADBAND-V2 bluetoothd[237]: src/adapter.c:btd_adapter_new() Major class: 0 bluetoothd[237]: src/adapter.c:btd_adapter_new() Minor class: 0 bluetoothd[237]: src/adapter.c:btd_adapter_new() Modalias: usb:v1D6Bp0246d0536 bluetoothd[237]: src/adapter.c:btd_adapter_new() Discoverable timeout: 180 seconds bluetoothd[237]: src/adapter.c:btd_adapter_new() Pairable timeout: 0 seconds bluetoothd[237]: src/adapter.c:index_added() sending read info command for index 0 bluetoothd[237]: src/adapter.c:read_info_complete() index 0 status 0x00 bluetoothd[237]: src/adapter.c:clear_uuids() sending clear uuids command for index 0 bluetoothd[237]: src/adapter.c:clear_devices() sending clear devices command for index 0 bluetoothd[237]: src/adapter.c:set_mode() sending set mode command for index 0 bluetoothd[237]: src/adapter.c:set_mode() sending set mode command for index 0 bluetoothd[237]: src/adapter.c:set_mode() sending set mode command for index 0 bluetoothd[237]: src/adapter.c:set_privacy() sending set privacy command for index 0 bluetoothd[237]: src/adapter.c:set_privacy() setting privacy mode 0x00 for index 0 bluetoothd[237]: src/gatt-database.c:btd_gatt_database_new() GATT Manager registered for adapter: /org/bluez/hci0 bluetoothd[237]: src/adapter.c:adapter_service_add() /org/bluez/hci0 bluetoothd[237]: src/sdpd-service.c:add_record_to_server() Adding record with handle 0x10001 bluetoothd[237]: src/sdpd-service.c:add_record_to_server() Record pattern UUID 00000007-0000-1000-8000-00805f9 bluetoothd[237]: src/sdpd-service.c:add_record_to_server() Record pattern UUID 00000100-0000-1000-8000-00805f9 bluetoothd[237]: src/sdpd-service.c:add_record_to_server() Record pattern UUID 00001002-0000-1000-8000-00805f9 bluetoothd[237]: src/sdpd-service.c:add_record_to_server() Record pattern UUID 00001800-0000-1000-8000-00805f9 bluetoothd[237]: src/adapter.c:adapter_service_insert() /org/bluez/hci0 bluetoothd[237]: src/adapter.c:add_uuid() sending add uuid command for index 0 bluetoothd[237]: src/adapter.c:adapter_service_add() /org/bluez/hci0 bluetoothd[237]: src/sdpd-service.c:add_record_to_server() Adding record with handle 0x10002 bluetoothd[237]: src/sdpd-service.c:add_record_to_server() Record pattern UUID 00000007-0000-1000-8000-00805f9 bluetoothd[237]: src/sdpd-service.c:add_record_to_server() Record pattern UUID 00000100-0000-1000-8000-00805f9 bluetoothd[237]: src/sdpd-service.c:add_record_to_server() Record pattern UUID 00001002-0000-1000-8000-00805f9 bluetoothd[237]: src/sdpd-service.c:add_record_to_server() Record pattern UUID 00001801-0000-1000-8000-00805f9 bluetoothd[237]: src/adapter.c:adapter_service_insert() /org/bluez/hci0 bluetoothd[237]: src/adapter.c:add_uuid() sending add uuid command for index 0 bluetoothd[237]: src/advertising.c:btd_adv_manager_new() LE Advertising Manager created for adapter: /org/bluez/hci0 bluetoothd[237]: plugins/hostname.c:hostname_probe() bluetoothd[237]: profiles/network/manager.c:panu_server_probe() path /org/bluez/hci0 bluetoothd[237]: profiles/network/server.c:server_register() Registered interface org.bluez.NetworkServer1 on path /org/bluez/hci0 bluetoothd[237]: profiles/network/manager.c:gn_server_probe() path /org/bluez/hci0 bluetoothd[237]: profiles/network/manager.c:nap_server_probe() path /org/bluez/hci0 bluetoothd[237]: src/adapter.c:btd_adapter_unblock_address() hci0 00:00:00:00:00:00 bluetoothd[237]: src/adapter.c:load_link_keys() hci0 keys 0 debug_keys 0 bluetoothd[237]: src/adapter.c:load_ltks() hci0 keys 0 bluetoothd[237]: src/adapter.c:load_irks() hci0 irks 0 bluetoothd[237]: src/adapter.c:load_conn_params() hci0 conn params 0 bluetoothd[237]: src/adapter.c:adapter_service_insert() /org/bluez/hci0 bluetoothd[237]: src/adapter.c:add_uuid() sending add uuid command for index 0 bluetoothd[237]: src/adapter.c:set_did() hci0 source 2 vendor 1d6b product 246 version 536 bluetoothd[237]: src/adapter.c:adapter_register() Adapter /org/bluez/hci0 registered bluetoothd[237]: src/adapter.c:set_dev_class() sending set device class command for index 0 bluetoothd[237]: src/adapter.c:set_name() sending set local name command for index 0 bluetoothd[237]: src/adapter.c:new_settings_callback() Settings: 0x00000280 bluetoothd[237]: src/adapter.c:settings_changed() Changed settings: 0x00000200 bluetoothd[237]: src/adapter.c:settings_changed() Pending settings: 0x00000000 bluetoothd[237]: src/adapter.c:new_settings_callback() Settings: 0x00000282 bluetoothd[237]: src/adapter.c:settings_changed() Changed settings: 0x00000002 bluetoothd[237]: src/adapter.c:settings_changed() Pending settings: 0x00000000 bluetoothd[237]: src/adapter.c:new_settings_callback() Settings: 0x00000292 bluetoothd[237]: src/adapter.c:settings_changed() Changed settings: 0x00000010 bluetoothd[237]: src/adapter.c:settings_changed() Pending settings: 0x00000000 bluetoothd[237]: src/adapter.c:new_settings_callback() Settings: 0x0000029a bluetoothd[237]: src/adapter.c:settings_changed() Changed settings: 0x00000008 bluetoothd[237]: src/adapter.c:settings_changed() Pending settings: 0x00000000 bluetoothd[237]: src/adapter.c:local_name_changed_callback() Name: TESTBENCH-V2 bluetoothd[237]: src/adapter.c:local_name_changed_callback() Short name: bluetoothd[237]: src/adapter.c:local_name_changed_callback() Current alias: TESTBENCH-V2 bluetoothd[237]: src/adapter.c:new_settings_callback() Settings: 0x0000069a bluetoothd[237]: src/adapter.c:settings_changed() Changed settings: 0x00000400 bluetoothd[237]: src/adapter.c:settings_changed() Pending settings: 0x00000000 bluetoothd[237]: Failed to clear UUIDs: Busy (0x0a) bluetoothd[237]: src/adapter.c:new_settings_callback() Settings: 0x0000069b bluetoothd[237]: src/adapter.c:settings_changed() Changed settings: 0x00000001 bluetoothd[237]: src/adapter.c:settings_changed() Pending settings: 0x00000000 bluetoothd[237]: src/adapter.c:adapter_start() adapter /org/bluez/hci0 has been enabled bluetoothd[237]: src/adapter.c:trigger_passive_scanning() bluetoothd[237]: src/adapter.c:new_settings_callback() Settings: 0x000006db bluetoothd[237]: src/adapter.c:settings_changed() Changed settings: 0x00000040 bluetoothd[237]: src/adapter.c:settings_changed() Pending settings: 0x00000000 bluetoothd[237]: src/adapter.c:new_settings_callback() Settings: 0x00000edb bluetoothd[237]: src/adapter.c:settings_changed() Changed settings: 0x00000800 bluetoothd[237]: src/adapter.c:settings_changed() Pending settings: 0x00000000 bluetoothd[237]: Failed to set privacy: Rejected (0x0b) bluetoothd[237]: src/adapter.c:load_link_keys_complete() link keys loaded for hci0 bluetoothd[237]: src/adapter.c:load_ltks_complete() LTKs loaded for hci0 bluetoothd[237]: src/adapter.c:load_irks_complete() IRKs loaded for hci0 bluetoothd[237]: src/adapter.c:load_conn_params_complete() Connection Parameters loaded for hci0 bluetoothd[237]: src/adapter.c:local_name_changed_callback() Name: XXXXXX-HEADBAND-V2 bluetoothd[237]: src/adapter.c:local_name_changed_callback() Short name: bluetoothd[237]: src/adapter.c:local_name_changed_callback() Current alias: XXXXXXX-HEADBAND-V2 # run btgatt client here... bluetoothd[237]: src/adapter.c:connected_callback() hci0 device 80:32:53:37:58:A6 connected eir_len 0 bluetoothd[237]: src/device.c:device_create() dst 80:32:53:37:58:A6 bluetoothd[237]: src/device.c:device_new() address 80:32:53:37:58:A6 bluetoothd[237]: src/device.c:device_new() Creating device /org/bluez/hci0/dev_80_32_53_37_58_A6 bluetoothd[237]: src/gatt-database.c:connect_cb() New incoming LE ATT connection bluetoothd[237]: attrib/gattrib.c:g_attrib_ref() 0x4c56848: g_attrib_ref=1 bluetoothd[237]: src/device.c:load_gatt_db() Restoring 80:32:53:37:58:A6 gatt database from file bluetoothd[237]: No cache for 80:32:53:37:58:A6 bluetoothd[237]: src/gatt-client.c:btd_gatt_client_connected() Device connected. bluetoothd[237]: src/device.c:gatt_debug() MTU exchange complete, with MTU: 256 bluetoothd[237]: src/device.c:gatt_debug() Read By Type - start: 0x0001 end: 0xffff bluetoothd[237]: src/device.c:gatt_debug() MTU Exchange failed. ATT ECODE: 0x06 bluetoothd[237]: src/device.c:gatt_debug() Read By Grp Type - start: 0x0001 end: 0xffff bluetoothd[237]: src/device.c:gatt_debug() Read By Type - start: 0x0010 end: 0xffff bluetoothd[237]: src/device.c:gatt_debug() Primary service discovery failed. ATT ECODE: 0x06 bluetoothd[237]: src/device.c:gatt_debug() Failed to initialize gatt-client bluetoothd[237]: src/device.c:gatt_client_ready_cb() status: failed, error: 6 bluetoothd[237]: src/device.c:device_svc_resolved() /org/bluez/hci0/dev_80_32_53_37_58_A6 err -5 bluetoothd[237]: src/device.c:gatt_debug() Read By Grp Type - start: 0x0010 end: 0xffff bluetoothd[237]: src/device.c:gatt_debug() Read By Grp Type - start: 0x0001 end: 0xffff bluetoothd[237]: src/device.c:gatt_debug() Read By Type - start: 0x0001 end: 0x000f bluetoothd[237]: src/device.c:gatt_debug() Read By Type - start: 0x0001 end: 0x000f bluetoothd[237]: src/device.c:gatt_debug() Read By Type - start: 0x000f end: 0x000f bluetoothd[237]: src/device.c:gatt_debug() Read By Type - start: 0x0001 end: 0xffff bluetoothd[237]: src/gatt-database.c:db_hash_read_cb() Database Hash read ==237== Invalid read of size 1 ==237== at 0x4831BA4: memcpy (vg_replace_strmem.c:1035) ==237== by 0x79E1B: ??? (in /usr/bin/bluetoothd) ==237== Address 0x0 is not stack'd, malloc'd or (recently) free'd ==237== ==237== ==237== Process terminating with default action of signal 11 (SIGSEGV) ==237== Access not within mapped region at address 0x0 ==237== at 0x4831BA4: memcpy (vg_replace_strmem.c:1035) ==237== by 0x79E1B: ??? (in /usr/bin/bluetoothd) ==237== If you believe this happened as a result of a stack ==237== overflow in your program's main thread (unlikely but ==237== possible), you can try to increase the size of the ==237== main thread stack using the --main-stacksize= flag. ==237== The main thread stack size used in this run was 8388608. /usr/bin/bluetoothd: can't resolve symbol '__libc_freeres' ==237== ==237== HEAP SUMMARY: ==237== in use at exit: 40,320 bytes in 860 blocks ==237== total heap usage: 4,297 allocs, 3,437 frees, 981,133 bytes allocated ==237== ==237== For a detailed leak analysis, rerun with: --leak-check=full ==237== ==237== For counts of detected and suppressed errors, rerun with: -v ==237== ERROR SUMMARY: 57 errors from 3 contexts (suppressed: 0 from 0) Segmentation fault >From my host, I run this command to trigger the segmentation fault : [arthur ] sudo ./btgatt-client -i hci0 -d cc:c0:79:ce:f9:56 -m 256 Connecting to device... Done [GATT client]# Service Added - UUID: 00001800-0000-1000-8000-00805f9b34fb start: 0x0001 end: 0x0005 [GATT client]# Service Added - UUID: 00001801-0000-1000-8000-00805f9b34fb start: 0x0006 end: 0x000f [GATT client]# GATT discovery procedures failed - error code: 0x00 [GATT client]# Device disconnected: Connection reset by peer Shutting down... When I run the test with btgatt-client from 5.50 release, there is no issue. Is it normal?