I appended gdb and valgrind outputs showing the crash. I do not know if this is terribly useful without lightdm's debug symbols (do they exist? I didn't find such a package). But it might be, that lightdm does not use so many hash tables, so maybe this is already a unique identifier.
Kind regards Patrick
Starting program: /usr/sbin/lightdm lightdm
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
*** Error in `/usr/sbin/lightdm': double free or corruption (fasttop):
0x00005555557a1890 ***
Program received signal SIGABRT, Aborted.
0x00007ffff665c077 in __GI_raise (sig=sig@entry=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:56
(gdb) bt
#0 0x00007ffff665c077 in __GI_raise (sig=sig@entry=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x00007ffff665d458 in __GI_abort () at abort.c:89
#2 0x00007ffff6699fb4 in __libc_message (do_abort=do_abort@entry=1,
fmt=fmt@entry=0x7ffff678cbc0 "*** Error in `%s': %s: 0x%s ***\n") at
../sysdeps/posix/libc_fatal.c:175
#3 0x00007ffff669f78e in malloc_printerr (action=1, str=0x7ffff678cda8 "double
free or corruption (fasttop)", ptr=<optimized out>)
at malloc.c:4996
#4 0x00007ffff66a0496 in _int_free (av=<optimized out>, p=<optimized out>,
have_lock=0) at malloc.c:3840
#5 0x00007ffff75384d8 in g_hash_table_insert_node
(hash_table=hash_table@entry=0x555555795360, node_index=node_index@entry=2,
key_hash=key_hash@entry010908315, new_key=new_key@entry=0x5555557a1db0,
new_value=new_value@entry=0x5555557a1ca0,
keep_new_key=keep_new_key@entry=0, reusing_key=0) at
/build/glib2.0-Dv_k6u/glib2.0-2.42.0/./glib/ghash.c:936
#6 0x00007ffff7538706 in g_hash_table_insert_internal
(hash_table=0x555555795360, key=0x5555557a1db0, value=0x5555557a1ca0,
keep_new_key=0) at /build/glib2.0-Dv_k6u/glib2.0-2.42.0/./glib/ghash.c:1173
#7 0x0000555555578ed0 in ?? ()
#8 0xffffffffffffff90 in ?? ()
#9 0x00005555557a1d00 in ?? ()
#10 0x00007fffffffe160 in ?? ()
#11 0x00005555557a17f0 in ?? ()
#12 0x00007fffffffe2a0 in ?? ()
#13 0x000055555579b520 in ?? ()
#14 0x00005555557a10a0 in ?? ()
#15 0x00005555557a12f0 in ?? ()
#16 0x00007fffffffe2a0 in ?? ()
#17 0x00007fffffffe160 in ?? ()
#18 0x00005555557a1310 in ?? ()
#19 0x0000555555579049 in ?? ()
#20 0x0000555555799340 in ?? ()
#21 0x000055555579b520 in ?? ()
#22 0x0000000000000000 in ?? ()
=519== Memcheck, a memory error detector =519== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al. =519== Using Valgrind-3.10.0 and LibVEX; rerun with -h for copyright info =519== Command: lightdm =519==519== Invalid free() / delete / delete[] / realloc() =519== at 0x4C29E90: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) =519== by 0x543A4D7: g_hash_table_insert_node (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.4200.0) =519== by 0x543A705: g_hash_table_insert_internal (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.4200.0) =519== by 0x12CECF: ??? (in /usr/sbin/lightdm) =519== by 0x12D048: ??? (in /usr/sbin/lightdm) =519== by 0x12D1C9: ??? (in /usr/sbin/lightdm) =519== by 0x12D275: ??? (in /usr/sbin/lightdm) =519== by 0x10F849: ??? (in /usr/sbin/lightdm) =519== by 0x6263B44: (below main) (libc-start.c:287) =519== Address 0x7b1b800 is 0 bytes inside a block of size 49 free'd =519== at 0x4C29E90: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) =519== by 0x543A4D7: g_hash_table_insert_node (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.4200.0) =519== by 0x543A705: g_hash_table_insert_internal (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.4200.0) =519== by 0x12CECF: ??? (in /usr/sbin/lightdm) =519== by 0x12D048: ??? (in /usr/sbin/lightdm) =519== by 0x12D1C9: ??? (in /usr/sbin/lightdm) =519== by 0x12D275: ??? (in /usr/sbin/lightdm) =519== by 0x10F849: ??? (in /usr/sbin/lightdm) =519== by 0x6263B44: (below main) (libc-start.c:287) =519==522==522== HEAP SUMMARY: =522== in use at exit: 236,074 bytes in 2,483 blocks =522== total heap usage: 6,276 allocs, 3,795 frees, 590,673 bytes allocated =522==522== LEAK SUMMARY: =522== definitely lost: 4,240 bytes in 8 blocks =522== indirectly lost: 664 bytes in 18 blocks =522== possibly lost: 11,372 bytes in 200 blocks =522== still reachable: 207,598 bytes in 2,171 blocks =522== suppressed: 0 bytes in 0 blocks =522== Rerun with --leak-check=full to see details of leaked memory =522==522== For counts of detected and suppressed errors, rerun with: -v =522== ERROR SUMMARY: 2 errors from 1 contexts (suppressed: 0 from 0) ** (lightdm:3519): WARNING **: Error getting user list from org.freedesktop.Accounts: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Accounts was not provided by any .service files =526==526== HEAP SUMMARY: =526== in use at exit: 290,261 bytes in 2,980 blocks =526== total heap usage: 9,338 allocs, 6,360 frees, 763,518 bytes allocated =526==526== LEAK SUMMARY: =526== definitely lost: 4,456 bytes in 9 blocks =526== indirectly lost: 5,736 bytes in 35 blocks =526== possibly lost: 12,548 bytes in 216 blocks =526== still reachable: 251,545 bytes in 2,610 blocks =526== suppressed: 0 bytes in 0 blocks =526== Rerun with --leak-check=full to see details of leaked memory =526==526== For counts of detected and suppressed errors, rerun with: -v =526== ERROR SUMMARY: 2 errors from 1 contexts (suppressed: 0 from 0) Failed to use bus name org.freedesktop.DisplayManager, do you have appropriate permissions? =519==519== HEAP SUMMARY: =519== in use at exit: 284,428 bytes in 2,854 blocks =519== total heap usage: 9,535 allocs, 6,683 frees, 804,733 bytes allocated =519==519== LEAK SUMMARY: =519== definitely lost: 440 bytes in 3 blocks =519== indirectly lost: 62,710 bytes in 41 blocks =519== possibly lost: 12,692 bytes in 209 blocks =519== still reachable: 193,634 bytes in 2,496 blocks =519== suppressed: 0 bytes in 0 blocks =519== Rerun with --leak-check=full to see details of leaked memory =519==519== For counts of detected and suppressed errors, rerun with: -v =519== ERROR SUMMARY: 2 errors from 1 contexts (suppressed: 0 from 0)
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