[SOLVED] Segmentation fault on successfully compiled and run program
lazarus / 32-Linux

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vrull · 2017-08-13 04:17

Hi,
I have got a strange situation, when my LCL GUI program runs on one
PC, where it was compiled, but fails with segmentation fault on others
with similar OS.

Edit: It is not really SOLVED, but I have discovered that if the
program was properly installed it would work all right without any
issues.
So I made a .deb package, installed it and got the program working.
What I tried before was running it under local user account from ~/bin
folder. Why these attempts failed on all, but my development computer,
I still have no idea.
end of Edit


My system:
Quote$ uname -a
Linux main 4.10.0-32-generic #36~16.04.1-Ubuntu SMP Wed Aug 9 09:19:02
UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
which means Linux Mint 18.2 (Sonya);  Mate desktop environment
Quote$ cat /proc/cpuinfo
processor   : 0
vendor_id   : AuthenticAMD
cpu family   : 16
model      : 6
model name   : AMD Athlon(tm) II X2 255 Processor
stepping   : 2
microcode   : 0x10000c7
cpu MHz      : 800.000
cache size   : 1024 KB
physical id   : 0
siblings   : 2
core id      : 0
cpu cores   : 2
apicid      : 0
initial apicid   : 0
fpu      : yes
fpu_exception   : yes
cpuid level   : 5
wp      : yes
flags      : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt
pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl
nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm
extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit
wdt hw_pstate vmmcall npt lbrv svm_lock nrip_save
bugs      : tlb_mmatch fxsave_leak sysret_ss_attrs null_seg
bogomips   : 6228.39
TLB size   : 1024 4K pages
clflush size   : 64
cache_alignment   : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate
AMD Athlon II 64 bit processor (two cores)

Lazarus ver. 1.6 stable x86_64-linux-GTK2
FPC ver. 3.0.0

Project targets x86_64 Linux GTK2

On the above configuration the program runs all right.

Other machines are all Intel ultra-low power PCs

Quote$ uname -a
Linux kodi-main 4.10.0-30-generic #34~16.04.1-Ubuntu SMP Wed Aug 2
02:13:56 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
Lubuntu 16.4

Quote$ cat /proc/cpuinfo
processor   : 0
vendor_id   : GenuineIntel
cpu family   : 6
model      : 76
model name   : Intel(R) Celeron(R) CPU  N3150  @ 1.60GHz
stepping   : 3
microcode   : 0x362
cpu MHz      : 479.882
cache size   : 1024 KB
physical id   : 0
siblings   : 4
core id      : 0
cpu cores   : 4
apicid      : 0
initial apicid   : 0
fpu      : yes
fpu_exception   : yes
cpuid level   : 11
wp      : yes
flags      : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall
nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl
xtopology tsc_reliable nonstop_tsc aperfmperf tsc_known_freq pni
pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm
sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes rdrand lahf_lm
3dnowprefetch epb tpr_shadow vnmi flexpriority ept vpid tsc_adjust
smep erms dtherm ida arat
bugs      :
bogomips   : 3200.00
clflush size   : 64
cache_alignment   : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:
this is info for one core of four (Intel Celeron 4 core ULW)
This was the only system which gave me something sensible:
Quote$ ./watermarker
-bash: ./watermarker: cannot execute binary file: Exec format error
The other two just said "segmentation fault". Another system is:
Quote$ uname -a
Linux <user> 4.4.0-91-generic #114-Ubuntu SMP Tue Aug 8 11:56:56 UTC
2017 x86_64 x86_64 x86_64 GNU/LinuxLinux Mint 18.1, Mate desktop
CPU model name   : Intel(R) Core(TM) i5-4200U CPU @ 1.60GHz

The program does not do anything fancy, It provides GUI for user to
enter some parameters and fill them into command templates to run
ImageMagick commands; they generate watermark images and apply them to
user's pictures.
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i program
watermarker; {$mode objfpc}{$H+} uses  {$IFDEF UNIX}{$IFDEF
UseCThreads}  cthreads,  {$ENDIF}{$ENDIF}  Interfaces, // this
includes the LCL widgetset  Forms, uMain, XMLFile, uparamlist; {$R
*.res} begin  RequireDerivedFormResource := True; 
Application.Initialize;  Application.CreateForm(TfrmMain, frmMain); 
Application.Run;end.       frmMain writes a lot of debug info into
StdOut at OnCreate event, but it crashes well before it - I see none
of them, when I run it in terminal.

Any ideas or suggestions where to look?
Surprisingly the previous version of this program ran OK on all
systems.

Thank you.

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Thaddy · 2017-08-13 06:12

Can it be a wrong or missing install of libmagick? That would be the
most likely cause.
Can it be a missing file or insufficient rights? (chmod +x) What
happens when you compile with {$IOCHECKS ON}{$RANGECHECKS ON}

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vrull · 2017-08-13 06:42

Thank you for your reply.
The program itself does not know anything about ImageMagick; it runs
external Process and looks for expected file to exist after that.
The execution rights are certainly set up, I checked this many times.
It crashes somewhere before even reaching OnCreate event of the main
form. I will wait until 13th is finished  then see what can be done.