I have installed the requested debug symbols and analyzed the core dump
using GDB.
Below is the full output. Note that there are some build-id mismatch
warnings (likely because my system has updated 'libglib' since the crash
occurred on Jan 2), but the backtrace successfully resolved the function
names and the error code.
GDB OUTPUT:
-------------------------------------------------------------------------
(gdb) bt
Reading symbols from /usr/libexec/bluetooth/bluetoothd...
Reading symbols from
/usr/lib/debug/.build-id/73/53a712454d0b568dec40727386e3a5d998d15c.debug...
warning: File /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.8600.0 doesn't match
build-id from core-file during file-backed mapping processing
[New LWP 5923]
warning: Build-id of /lib/x86_64-linux-gnu/libglib-2.0.so.0 does not
match core file.
warning: Could not load shared library symbols for
/lib/x86_64-linux-gnu/libglib-2.0.so.0.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/libexec/bluetooth/bluetoothd'.
Program terminated with signal SIGSEGV, Segmentation fault.
--Type <RET> for more, q to quit, c to continue without paging--bt
#0 btd_service_connecting_complete (service=0x60cf04cb2f9a, err=-5)
at src/service.c:411
warning: 411 src/service.c: No such file or directory
-------------------------------------------------------------------------
ANALYSIS:
The trace pinpoints the crash to `btd_service_connecting_complete` at
`src/service.c:411` with `err=-5` (EIO).
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https://bugs.launchpad.net/bugs/2137719
Title:
bluetoothd 5.83 segfault during GDM to Desktop session handoff on
Ubuntu 25.10 (MediaTek MT7925 / GNOME 49)
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