[Lazarus] Lots of access violations with TSQLConnection TSQLQuery on Linux

[Anthony Walter]

Sven,

I am fairly confident that I have all the required libraries installed and
configured correctly. Everything works fine, including reading data from my
remote server and applying updates. The exception is that if at design time
I change the Active property of any data related non visual component, then
I get an AV. Also, I did follow the instructions or guide on that page
prior to your suggestion and ti helped me connect to my remote server.

Michael,

To be sure I have the correct sources, I tried this twice. Once with my
current Lazarus, and again with svn fixes_2_0 Lazarus. Both exhibit the
same behavior and stack trace. Here is a screenshot of the error and the
stack trace. I simply opened the my project, set the SQL query Active
property to False, and I get this error.

https://cache.getlazarus.org/images/sql-linux-av.jpg

Stack trace:

~$ sudo gdb -batch -ex bt -p 29126

[New LWP 29127]
[New LWP 29128]
[New LWP 29129]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007fb9b9ed374d in poll () at ../sysdeps/unix/syscall-template.S:84
84 ../sysdeps/unix/syscall-template.S: No such file or directory.
#0  0x00007fb9b9ed374d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00000000004ea81c in GTK2POLLFUNCTION (UFDS=0x3858b80, NFSD=5,
TIMEOUT=50) at gtk2/gtk2widgetset.inc:44
#2  0x00007fb9bad9238c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb9bad92712 in g_main_loop_run () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fb9bb371b83 in gtk_dialog_run () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#5  0x000000000050c264 in PROMPTUSER (this=0x7fb9bc6fa310,
DIALOGCAPTION=0x137b180 "Error", DIALOGMESSAGE=0x7fb994e803d8 "Access
violation", DIALOGTYPE=257, BUTTONS=0x7fb9a8943c60, BUTTONCOUNT=1,
DEFAULTINDEX=0, ESCAPERESULT=2) at gtk2/gtk2lclintf.inc:1271
#6  0x00000000005b982d in PROMPTUSER (DIALOGCAPTION=0x137b180 "Error",
DIALOGMESSAGE=0x7fb994e803d8 "Access violation", DIALOGTYPE=257,
BUTTONS=0x7fb9a8943c60, BUTTONCOUNT=1, DEFAULTINDEX=0, ESCAPERESULT=2) at
include/lclintf.inc:376
#7  0x000000000057ae91 in MESSAGEDLG (ACAPTION=0x137b180 "Error",
AMSG=0x11fdc10 "Access violation", DLGTYPE=MTERROR, BUTTONS=..., HELPCTX=0)
at include/messagedialogs.inc:148
#8  0x00000000008d5937 in SETROWVALUE (this=0x7fb994a87930,
CHECKFOCUS=true, FORCEVALUE=true) at objectinspector.pp:1602
#9  0x00000000008d65c3 in VALUECHECKBOXCLICK (this=0x7fb994a87930,
SENDER=0x7fb994a88d90) at objectinspector.pp:1764
#10 0x0000000000cc7e33 in SETSTATE (this=0x7fb994a88d90,
AVALUE=CBUNCHECKED) at checkboxthemed.pas:475
#11 0x0000000000cc7d14 in SETCHECKED (this=0x7fb994a88d90, AVALUE=false) at
checkboxthemed.pas:460
#12 0x00000000008d86a5 in SETITEMINDEXANDFOCUS (this=0x7fb994a87930,
NEWITEMINDEX=0, WASVALUECLICK=true) at objectinspector.pp:2295
#13 0x00000000008d8a30 in MOUSEDOWN (this=0x7fb994a87930, BUTTON=MBLEFT,
SHIFT=..., X=184, Y=7) at objectinspector.pp:2399
#14 0x00000000005a1998 in DOMOUSEDOWN (this=0x7fb994a87930, MESSAGE=...,
BUTTON=MBLEFT, SHIFT=...) at include/control.inc:2283
#15 0x00000000005a1fd9 in WMLBUTTONDOWN (this=0x7fb994a87930, MESSAGE=...)
at include/control.inc:2462
#16 0x0000000000431bca in SYSTEM$_$TOBJECT_$__$$_DISPATCH$formal ()
#17 0x00007fb994a87930 in ?? ()
#18 0x00007fff33fc7e10 in ?? ()
#19 0x0000000000000201 in ?? ()
#20 0x000000000000002c in ?? ()
#21 0x00000000016d3900 in .Ld233 ()
#22 0x00000000016d3228 in VMT_$CONTROLS_$$_TWINCONTROL$indirect ()
#23 0x00007fff33fc8090 in ?? ()
#24 0x0000000003c41710 in ?? ()
#25 0x00007fff33fc80b0 in ?? ()
#26 0x00007fff33fc8110 in ?? ()
#27 0x000000000066aee0 in ?? ()
#28 0x00000000005a18a4 in WNDPROC (this=0x7fb994a87930, THEMESSAGE=...) at
include/control.inc:2243
#29 0x0000000000594899 in WNDPROC (this=0x7fb994a87930, MESSAGE=...) at
include/wincontrol.inc:5425
#30 0x0000000000754322 in DELIVERMESSAGE (TARGET=0x7fb994a87930,
AMESSAGE=0) at lclmessageglue.pas:112
#31 0x000000000065d950 in DELIVERMESSAGE (TARGET=0x7fb994a87930,
AMESSAGE=0) at gtk2/gtk2proc.inc:3780
#32 0x000000000066b8a9 in DELIVERMOUSEDOWNMESSAGE (WIDGET=0x3c287f0,
EVENT=0x41f8c30, AWINCONTROL=0x7fb994a87930) at gtk2/gtk2callback.inc:2071
#33 0x000000000066af18 in GTKMOUSEBTNPRESS (WIDGET=0x3c41710,
EVENT=0x41f8c30, DATA=0x7fb994a87930) at gtk2/gtk2callback.inc:1798
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