Segmentation fault Centos

Targets Linux
1

Google Cloud centos Linix
yum Updated & upgraded
uname -a = 3.10.0-957.21.3.el7.x86_64 #1 SMP Tue Jun 18 16:35:19 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Xojo linux64 bit console app
Compiles works ok on OSX
Compile for linux64 bit it runs the app until it gets to the line

html= webconnection.SendSync(“GET”, “https://anyurl” , 30) - it always throws on this line (except on OSX)

(webconnection is an persistent  instance of URLConnection which never goes out of scope)

On mac it returns block 1 of the TRON token blockchain network. works fine on Mac

However, Linux (Centos 7 GC)

On that specific line it throws a segmentation fault

ldd reports
linux-vdso.so.1 => (0x00007ffd54487000)
XojoConsoleFramework64.so => /home/xxx/./xxx Libs/XojoConsoleFramework64.so (0x00007ff916d4a000)
libc.so.6 => /lib64/libc.so.6 (0x00007ff91697d000)
libgobject-2.0.so.0 => /lib64/libgobject-2.0.so.0 (0x00007ff91672d000)
libglib-2.0.so.0 => /lib64/libglib-2.0.so.0 (0x00007ff916417000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007ff9161fb000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007ff915ff7000)
librt.so.1 => /lib64/librt.so.1 (0x00007ff915def000)
libm.so.6 => /lib64/libm.so.6 (0x00007ff915aed000)
libunwind.so.8 => /lib64/libunwind.so.8 (0x00007ff9158d3000)
libunwind-x86_64.so.8 => /lib64/libunwind-x86_64.so.8 (0x00007ff9156b3000)
libc++.so.1 => /home/igg/xxx/./xxx Libs/libc++.so.1 (0x00007ff915302000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007ff9150ec000)
/lib64/ld-linux-x86-64.so.2 (0x00007ff91926e000)
libpcre.so.1 => /lib64/libpcre.so.1 (0x00007ff914e8a000)
libffi.so.6 => /lib64/libffi.so.6 (0x00007ff914c82000)

(not so sure why its got a " /./ " in the libc++.so line? could this be the issue?

Any help would be appreciated, I don’t think google cloud would let me take a mac down and run it on their network!
I have run all the Xojo requisites for Centos

2

Missing WebKit?

3

Installed

sudo yum install webkitgtk4.x86_64

still same error.

it has these other packages

PyQt4-webkit.x86_64 : Python bindings for Qt4 Webkit
PyQt4-webkit-devel.noarch : Files needed to build other bindings based on Qt4 WebKit
kdelibs-webkit.x86_64 : KDE WebKit support library
kdelibs-webkit-devel.x86_64 : Development files for KDE WebKit support library
kf5-kdewebkit.x86_64 : KDE Frameworks 5 Tier 3 integration module for QtWebKit
kf5-kdewebkit-devel.x86_64 : Development files for kf5-kdewebkit
kwebkitpart.x86_64 : A KPart based on QtWebKit
libproxy-webkitgtk3.x86_64 : Plugin for libproxy and webkitgtk3
mingw32-qt5-qtwebkit.noarch : Qt5 for Windows - QtWebkit component
mingw32-webkitgtk-static.noarch : Static version of the MinGW Windows WebKitGTK+ library
mingw64-qt5-qtwebkit.noarch : Qt5 for Windows - QtWebkit component
mingw64-webkitgtk-static.noarch : Static version of the MinGW Windows WebKitGTK+ library
perl-Gtk3-WebKit.noarch : WebKit bindings for Perl
python36-qt5-webkit.x86_64 : Python3 bindings for Qt5 Webkit
pywebkitgtk.x86_64 : Python Bindings for WebKit-gtk
qt5-qtwebkit.x86_64 : Qt5 - QtWebKit components
qt5-qtwebkit-devel.x86_64 : Development files for qt5-qtwebkit
qtwebkit.x86_64 : Qt WebKit bindings
qtwebkit-devel.x86_64 : Development files for qtwebkit
webkitgtk3-devel.i686 : Development files for webkitgtk3
webkitgtk3-devel.x86_64 : Development files for webkitgtk3
webkitgtk3-doc.noarch : Documentation files for webkitgtk3
webkitgtk4-devel.i686 : Development files for webkitgtk4
webkitgtk4-devel.x86_64 : Development files for webkitgtk4
webkitgtk4-doc.noarch : Documentation files for webkitgtk4
webkitgtk4-jsc.i686 : JavaScript engine from webkitgtk4
webkitgtk4-jsc.x86_64 : JavaScript engine from webkitgtk4
webkitgtk4-jsc-devel.i686 : Development files for JavaScript engine from webkitgtk4
webkitgtk4-jsc-devel.x86_64 : Development files for JavaScript engine from webkitgtk4
webkitgtk4-plugin-process-gtk2.i686 : GTK+ 2 based NPAPI plugins support for webkitgtk4
webkitgtk4-plugin-process-gtk2.x86_64 : GTK+ 2 based NPAPI plugins support for webkitgtk4
CutyCapt.x86_64 : A small command-line utility to capture WebKit’s rendering of a web page
chromium.x86_64 : A WebKit (Blink) powered web browser
mingw32-webkitgtk.noarch : MinGW Windows web content engine library
mingw32-webkitgtk3.noarch : MinGW Windows web content engine library
mingw64-webkitgtk.noarch : MinGW Windows web content engine library
mingw64-webkitgtk3.noarch : MinGW Windows web content engine library
webkitgtk3.i686 : GTK+ Web content engine library
webkitgtk3.x86_64 : GTK+ Web content engine library
webkitgtk4.i686 : GTK+ Web content engine library
webkitgtk4.x86_64 : GTK+ Web content engine library

4

Added all glibc packs

yum install glibc-common.x86_64 compat-glibc.x86_64 glibc.x86_64 glibc-devel.x86_64 glibc-headers.x86_64 glibc-static.x86_64 glibc-utils.x86_64

still errors

5

Have you found the cause of this crash?

We have very similar issue.

Xojo: 2019R1.1
Build linux 64 bit.

Got crash dump from “core” and gdb.

#0  0x00007f1678570901 in __strlen_sse2_pminub () from /lib64/libc.so.6
#1  0x00007f1678a75b10 in ?? () from /opt/app/bua Libs/XojoConsoleFramework64.so
#2  0x00007f1678a0d17c in ?? () from /opt/app/bua Libs/XojoConsoleFramework64.so
#3  0x00007f1678aa09d5 in ?? () from /opt/app/bua Libs/XojoConsoleFramework64.so
#4  0x00007f1678aa0068 in ?? () from /opt/app/bua Libs/XojoConsoleFramework64.so
#5  0x00007f1678aa139b in ?? () from /opt/app/bua Libs/XojoConsoleFramework64.so
#6  0x00007f1678aa0b5e in ?? () from /opt/app/bua Libs/XojoConsoleFramework64.so
#7  0x00007f1678a9f4ba in URLConnection_SendSync () from /opt/app/bua Libs/XojoConsoleFramework64.so
#8  0x000000000048d2cb in URLConnection.SendSync%s%o<URLConnection>ssi8 ()
....

the code caused it, very simple:

dim response as string = sock.SendSync("GET", url, 20)
6

Does your processor support SSE2 instructions?

lshw -class processor | grep -w sse2

7

model name : Intel® Xeon® Platinum 8175M CPU @ 2.50GHz

It’s Amazon t3.small instance

cat /proc/cpuinfo | grep sse2

flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid tsc_known_freq pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx avx512f avx512dq rdseed adx smap clflushopt clwb avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves ida arat pku ospke
8

Seems you guys need engineering help. Any chance of a feedback post with sample code replicating the problems?

9

That’s an issue with the strlen command as Xojo is calling it on Linux. @William Yu - is it possible that the Xojo string being parsed from SendSync is not null terminated? If not, that could cause strlen to step into a protected memory segment.

Regardless, as Rick says, this one needs a Feedback report.