[Pkg-mpd-maintainers] Bug#998310: mpd: fails to start with "Assertion `sockets.empty()' failed."

[Benjamin Francois]

On Tue, 2 Nov 2021 13:53:20 +0100 Max Kellermann wrote:
> TLDR: it's complicated, and we can't see the real error just yet.

Hello! I am having the same issue so I thought I'd give it a go.
❯ sudo gdb --args mpd --stderr --no-daemon --verbose
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Reading symbols from mpd...
(No debugging symbols found in mpd)
(gdb) catch throw
Catchpoint 1 (throw)
(gdb) run
Starting program: /usr/bin/mpd --stderr --no-daemon --verbose
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
config_file: loading file /etc/mpd.conf
path: SetFSCharset: fs charset is
libsamplerate: libsamplerate converter 'Fastest Sinc Interpolator'
vorbis: Xiph.Org libVorbis 1.3.7
opus: libopus 1.3.1
sndfile: libsndfile-1.0.31
adplug: adplug 2.3.3
simple_db: reading DB

Catchpoint 1 (exception thrown), 0x00007ffff36a6322 in __cxa_throw () from /lib/x86_64-linux-gnu/libstdc++.so.6
(gdb) bt
#0 0x00007ffff36a6322 in __cxa_throw () at /lib/x86_64-linux-gnu/libstdc++.so.6
#1 0x000055555559e71f in ()
#2 0x000055555565fa6c in ()
#3 0x0000555555660721 in ()
#4 0x00005555555a4aed in ()
#5 0x00005555555a4d4d in ()
#6 0x00005555555a302a in ()
#7 0x00007ffff32dde4a in __libc_start_main (main=
0x5555555a3010, argc=4, argv=0x7fffffffe5f8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe5e8) at ../csu/libc-start.c:314
#8 0x00005555555a33da in ()
(gdb) cont
Continuing.
exception: Tag list mismatch, discarding database file
curl: version 7.74.0
curl: with GnuTLS/3.7.2

Catchpoint 1 (exception thrown), 0x00007ffff36a6322 in __cxa_throw () from /lib/x86_64-linux-gnu/libstdc++.so.6
(gdb) bt
#0 0x00007ffff36a6322 in __cxa_throw () at /lib/x86_64-linux-gnu/libstdc++.so.6
#1 0x000055555558ba6e in ()
#2 0x00005555555a44ed in ()
#3 0x00005555555a4d4d in ()
#4 0x00005555555a302a in ()
#5 0x00007ffff32dde4a in __libc_start_main (main=
0x5555555a3010, argc=4, argv=0x7fffffffe5f8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe5e8) at ../csu/libc-start.c:314
#6 0x00005555555a33da in ()
(gdb) cont
Continuing.
mpd: ../src/event/Loop.cxx:60: EventLoop::~EventLoop(): Assertion `sockets.empty()' failed.

Program received signal SIGABRT, Aborted.
__GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:49
49 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0 __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:49
#1 0x00007ffff32dc536 in __GI_abort () at abort.c:79
#2 0x00007ffff32dc41f in __assert_fail_base
(fmt=0x7ffff34436b0 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x55555569afa2 "sockets.empty()", file=0x55555569af5c "../src/event/Loop.cxx", line=60, function=<optimized out>) at assert.c:92
#3 0x00007ffff32eb7f2 in __GI___assert_fail
(assertion=0x55555569afa2 "sockets.empty()", file=0x55555569af5c "../src/event/Loop.cxx", line=60, function=0x55555569af44 "EventLoop::~EventLoop()") at assert.c:101
#4 0x00005555555e5458 in ()
#5 0x00005555555b7c56 in ()
#6 0x00005555555867a1 in ()
#7 0x00005555555a4d4d in ()
#8 0x00005555555a302a in ()
#9 0x00007ffff32dde4a in __libc_start_main (main=
0x5555555a3010, argc=4, argv=0x7fffffffe5f8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe5e8) at ../csu/libc-start.c:314
#10 0x00005555555a33da in ()
(gdb) cont
Continuing.

Program terminated with signal SIGABRT, Aborted.
The program no longer exists.
(gdb)

Hope this helps!
Cheers,
Ben.

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