[Lazarus] [Qt] Random issues at startup

Vojtěch Čihák vojtech.cihak at atlas.cz
Mon Feb 23 21:30:59 CET 2015


The code is LCL only. I do not use Qt directly.
It is Chakra linux, 64-bit. Qt 4.8.6. I tried FpDebug and gdb again.
When it crashes (after ~ 5 attempts) and I press "Pause", CallStack gives this:
 
#0 __lll_lock_wait_private at :0
#1 malloc at :0
#2 _dl_map_object_deps at :0
#3 dl_open_worker at :0
#4 _dl_catch_error at :0
#5 _dl_open at :0
#6 do_dlopen at :0
#7 _dl_catch_error at :0
#8 dlerror_run at :0
#9 __libc_dlopen_mode at :0
#10 init at :0
#11 pthread_once at :0
#12 backtrace at :0
#13 backtrace_and_maps at :0
#14 __libc_message at :0
#15 malloc_printerr at :0
#16 _int_malloc at :0
#17 malloc at :0
#18 operator new(unsigned long) at :0
#19 QMutexPool::createMutex(int) at :0
#20 ?? at :0
#21 QObject::connect(QObject const*, char const*, QObject const*, char const*, Qt::ConnectionType) at :0
#22 QObject_hook_create at :0
#23 APPINIT(0xfedc88, {PIXELSPERINCHX = 72, PIXELSPERINCHY = 72, COLORDEPTH = 24, INITIALIZED = false}) at qt/qtobject.inc:228
#24 INITIALIZE(0xfed2b8) at include/application.inc:445
#25 main at ecsas.lpr:23
______________________________________________________________
> Od: <zeljko at holobit.net>
> Komu: Lazarus mailing list <lazarus at lists.lazarus.freepascal.org>
> Datum: 23.02.2015 21:03
> Předmět: Re: [Lazarus] [Qt] Random issues at startup
>
On 2015-02-23 09:10, Vojtěch Čihák wrote:
> Hi,
> 
> I work on app. (~20000 lines) and sometimes at startup (10 - 15% cases
> of hiting F9) I got this message in console:
> 
> malloc(): smallbin double linked list corrupted: 0x00000000010ee860
> ***
> 
> and it crashes.
> 
> (Note that it is only in Qt, the same app. in GTK2 is OK.)
> CallStack window doesn't show me anything.
> Google doesn't help much, I didn't find anything Lazarus-related but I
> found a few Qt related topics - one of them recommende valgrind.
> So I tried valgrind and KCacheGrind
> $ valgrind --tool=callgrind ./myprogram
> but it also didn't help me much (maybe I do it wrong ?). The last line
> of output is pointing to libQtCore.so.4.8.6
> I don't want to publish code yet and I cannot reproduce with a small
> demo.

Without code I can do exactly nothing. Are U using LCL code only or you 
include qt4 somewhere and use pure qt api. If it's something up to qtlcl 
then gdb should show it. 32 or 64 bit ? What distro (Qt packager) ?

z.

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